Great content Mike. Your videos always get me pointed in the right direction. I have copied your bends many times with great success. Thanks for sharing. I miss MOOGFEST this year!!!! :-(
@@SISKworks I used your Moogfest/harp delay circuit bends to make a eurorack delay module. I am also inspired by your use of ribbon cable. You turned me on to using pre-made inexpensive circuits to add functionality to my bends like changing out the capacitors in a function generator circuit to make an LFO. I also made myself a Hellophone microphone. And now I am working on using the LTC1799 to add a pitchbend wheel to a CASIO sa-76 project. The CASIO SA-76 sounds so good even without modification. I have eight of them sitting on a shelf. I would love to send you one or two of them for free. sorry no videos, I spend all my free time watching you and Kristian Bladsol and soldering. Let me know if you want some free Casios.
If some of you want to build this, pick a PWM controller with at least 20kHz but not much higher (not 100kHz or something like that) If your PWM controller is bellow 20kHz it will produce an audible noise.
Sirius360 Thank you so much for this! This has been driving me crazy why this unit makes that noise but another one with a different model PWM board does not. I’ll have to try and dig up the specs on each to confirm but I suspect this is my issue. Thanks again. I really appreciate it!
Hi, I just installed a pwm on a cassette machine and it is causing an awful popping/buzzing sound which goes up in pitch as the tape speed increases. I checked the khz and it is maximum 25khz so should be within the range you suggest. Do you know what could be causing this? Grounding? EMF interference? Any advice would be really appreciated! Thank you!
@@mark_fox_music Sorry for the late response. If the noise goes up in pitch as the speed increases, it's propably the motor itselfe which makes that sound. The frequency of the pwm controller should stay constant. To get rid of the motor noise is a bit tricky. I had the same problem on one of my cassette players. I ended up using a different power supply just for the motor so the motor is not connected to the cassette circuit.
I commented earlier assuming this suggestion was for the pot value but now that I have read a little more it seems like pwm frequency is different? Do you know of a specific model that would work best for this type of mod?
@@idlefingerboards2629 i have used this one and it works great: a.aliexpress.com/_mMsGA2d i have moded 3 cassette decks already. sometimes the slower running motor can introduce noise in the system. you will hear a pitch which is higher when the motor runs faster and lower when it runs slower. this is not the fault of the PWM controller. in one unit it was really loud so I bought a different power suply just for the motor. so my whole deck runs off the normal power supply except the motor and pwm controller. because of that no motor noise can reach the system and distort my sound. I hope you won't have to do that. but just in case you run into this problem
Hi, I found this after watching one of your tape bent bids on a bending Facebook group. Nice instructable. I have now bought the correct own circuit board, and realised that you need to rip out the motor PCB, thanks.
Yes you would have to bypass the internal voltage controller that is located INSIDE the motor. I think it should also work without bypassing but you just won’t have as wide of range of control.
@@SISKworks you're quite right, I did this with a shoe box style deck, I'd picked the wrong PWM circuit board and the range was small, no high speed, and the pot behaved like a hair trigger on the small amount of control it had. I'll be revisiting the project again now, and I'm going to revisit an old oil gobbo light projector, I tried the pwm hack on the gobbo wheel motor, didn't even turn, hopefully it'll work now.
I did this mod again just last week and thought I was being super careful to keep track of polarity but somehow once AGAIN it was backwards. I almost wonder if these PWM board just always need to be wired in reverse or something. Or maybe I just wasn’t understanding the original circuit that I bypassed.
I just finished this project. It came out really nice! I got one of those red 20kHz PWM boards. I had such a hard time desoldering the pot (I destroyed one board, the pads and the lanes came off) so I had to put it in a box on the outside. I’ll try to get better at desoldering components before I do this project again.
Oh that makes me so happy to hear that other people are doing my projects. That is so great! As far as desoldering goes, I always makes sure to add more solder first before trying to remove the old. Seems odd but it really helps.
@@SISKworks Yes I do, www.lightinthebox.com/en/p/au-pwm-dc-motor-speed-controller-5v-35v-5a-led-light-regulation-dimmer-switch_p7931785.html?prm=1.5.1.30 In the last unit I modified I was able to fit the whole board inside the case. I haven't been able to desolder the pot from these boards yet but it probably says more about my desoldering skills than the board. I just upgraded to a rework station so we'll see if the new equipment will save me.
Nice, thanks for sharing! I feel like this is a stupid question: what's the difference between using a PMW board and just adding in a pot before the motor? I'm guessing the PMW allows you to boost the speed (add more voltage and/or current?) but the pot would just allow you to cut what's being drawn, so okay to slow but wouldn't speed up? And with the PMW board, at the lowest range can it cut the motor, or does the PMW board prevent that? Thanks for any tips, got some tape decks ready for modding!
well if you guys didnt find out. basically, the motor requires a certain voltage to work properly. therrfore reducing the input voltage would not be a reliable way to slow the motor down. instead you use PWM to essentially turn the motor on many many times a second google pwm and duty cycle :)
This is a really cool video and I have always wanted to do this myself but I think I’m gonna break something lol and I also don’t have a soldering iron
Well I’m not exactly sure what you mean. One of the speaker wires should already be ground. That is just how circuits work. So if you use the same wires to make your new headphone output then it will already have a ground. So no additional ground needed.
Oh yeah. I didn't include any of that did I. Well now that I look back I see I actually bought on ebay and can't find them again. But looking on amazon these would also work. These are better than what I used because they are smaller. www.amazon.com/dp/B07W5NZPH1/ref=sspa_dk_detail_6?psc=1&pd_rd_i=B07W5NZPH1&pd_rd_w=ghWRj&pf_rd_p=45a72588-80f7-4414-9851-786f6c16d42b&pd_rd_wg=6b0B1&pf_rd_r=8R7B1CSMV2P8V7AH3HN7&pd_rd_r=c4a5f04f-d711-4bbe-996a-e7980cac59ee&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFXT0E5V1VXTFlWMFYmZW5jcnlwdGVkSWQ9QTA0MDMzNDUyRzlOQTY4RFVXTEhLJmVuY3J5cHRlZEFkSWQ9QTA2NTYyNDIyS1RBMzBZTVo2MDdGJndpZGdldE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
If the turntable had a DC motor then yes it will PROBABLY work. I’ve never opened a turntable so I don’t really know what type of motor they have. But don’t almost all turntables already have speed controls?
@@SISKworks they have different speeds depending on the size of the record and some turntables have a speed/pitch control as well but they have extremely limited ranges. However they also usually have a strobe sensor to keep them in time and idk if that would cause problems. I think I’m going to give it a shot!
@@broke8246 yea you should definitely give it a shot. I have turntables but they have already have a fairly wide range of speed on mine as they are more of a DJ type. I never thought to try modifying them even further though. Would be cool if you could get some super slow speeds. You can also try reversing the polarity to get the motor to spin backwards which can be cool with vinyl (not so much for cassette haha).
@@broke8246 not exactly. Yes,the motor will spin in reverse but since tape players are only driven one way it will just eat the tape. I know from experience. Over and over. Haha.
I not exactly sure. I speed it up enough that the algorithm wouldn’t hit me with a copyrighted violation and now I can’t even tell what song that was. I THINK I was listening to a DJ drum and bass mix so even if I knew which mix I probably still would not know what song. I just listened to that part multiple times and I still can’t make it out. Sorry.
Awesome video! Do you know if this would also work on a Tascam 414? I've popped the top off the motor and it looks the same but I don't want to wreck it. And is any PWM going to work? I found a Low Voltage DC PWM Motor Speed Controller Module 1.8V 3V-5V-6V 12V 2A S3Q4. Is that right? Thanks!
Simon the magpie just posted a speed modded cassette recorder with a kalimba on the lid on Instagram. Pretty freakin' nice. Can't wait to hear how it sound. I don't know what kind of resonance he will get in the cassette player body though.
@@SISKworks Now I finally saw it too. The acoustic is not that great but I'd love to check out that project where they put the tape player inside the kalimba instead.
Sorry, I didn’t explain that very well. The original pot had a built in switch (clicks on when you first turn it clockwise). But I wanted the PWM board to turn on with player so I just put a jumper (on the PWM board) where the two switch contacts would be. Without the jumper I would need to send 5 wires to the speed control pot but with the jumper I only need to send 3 wires. Totally not needed though. Works either way. Thanks for watching and commenting. Love to hear it when other people build my projects.
hey, I'm wondering what the PWM actually does. Does it allow more/less current to flow through? If so, would it be possible to attach a CV-sequencer instead of the pulse width modulation?
The PWM board works by turning the power on and off really fast. A CV sequencer directly would not work. But you can connect a vactrol to the PWM pot and inject CV control that way. Ive done that a few times. Check out my KeyPlayer video
Yeah there are so many different versions. It’s hard to always find the same model since it seems they are made by a ton of different companies. This one looks exactly like the last ones I bought but is made by a different company. www.amazon.com/UMLIFE-Controller-Control-Switch-Dimmer/dp/B098B2LRSK/ref=mp_s_a_1_18?keywords=PWM+Motor+Speed&qid=1696263034&sr=8-18
The pwm does not keep the speed constant, where the circuit in the motor/servo does, just wire an external pot into where the adjustment pot was on the motor pcb. Why make a simple job complicated.
I’ve got this working now. I’m confused about detaching the knob. What is the cable that I use to connect it to the pwm chip. And what is that red cable that is installed?
I used a piece of ribbon cable and pulled 3 wires off but you could also just use three individual wires. Red wire was to bypass the switch built into the potentiometer when you turn it. Removing that potentiometer is probably the hardest part. I’ve even damaged a board in the past doing it. So be gentle.
Just curious: If you would desolder the old motor speed, but still keep it powered, solder 2 wires from the lugs to a dpdt switch so you can switch between the newly soldered knob AND the old circuitboard, would that work? Or is the power going to the motor a part of how it works?
@@SISKworks Ah awesome, thanks for your quick reply. Your tutorial is a lot better and more clear than others. Will be soldering away this weekend. If it doesnt work no biggie ofcourse, but I kind of like the idea of having 'normal speed' as a set setting instead of dialing it in
This is really cool. I did it on one machine but on the second, the motor looks all weird inside and I don’t see a PCb there. Any idea if maybe that part of the circuitry was outside the motor?
hmm, i have a few portable decks where the motor PCB is inaccessible due to the main board in the way. Is there any way to add one of these without ripping out the motor PCB itself? I can identify the wires from the motor itself..
This is interesting. How much can the motor be increased beyond normal cassette speed? I am wanting to at least double the speed so I can quickly duplicate and covert cassettes to digital in half the time. A bit faster is even better then after conversion I slow down the audio back to normal in my PC audio app.
If you bypass the internal regulator that is inside the motor (which I didn’t show) you can get fairly fast speeds. But I’m not sure if it double or not. If you are using it to record, one thing to be aware of is that the PWM board does add a bit of motor noise at higher speed to the audio which is not ideal. It seems The only way around that is to have a completely separate battery pack for just the motor.
Almost all tape players have an adjustment inside the DC motor. But I’m am adding new speed adjust circuit and bypassing the one built inside the motor.
@@SISKworks Thanks Yes I understand just wondered if it was just this model or any flatbed cassette player. Thanks for your quick reply as it's quite an old post
No not really. With a normal pot you might be able to get the tape to slow down just a little bit and then it will stop. You would only have a SMALL amount of control. But with a PWM board like I show you get a big range of control. From faster than normal all the way down to a super slow crawl. That is just NOT possible with only a pot.
What exactly does that tiny PCB inside the motor do? I'm trying this mod at the moment, and the casing on my motor seems to be crimped shut so I can't get into it without wrecking the motor. I'm going to try cutting the wires going into the motor, and putting the PWM kit there instead, and hopefully the little board won't interfere with it working.
I know this comment is old, but as I understand it this won't work. The wires going to the motor are just power, wheras this is actually altering the circuitry inside the motor itself.
@@EpicStuffMan1000 Thanks! I tried putting the PWM kit on the wires going into the motor, and it worked. A pulse width modulator is just something that switches the power on and off at high frequency, so it makes sense that this works. However, I was getting a high-pitched noise, which I think was EM interference from the motor, and then the fuse suddenly blew on my tape player. That was probably unrelated! I suspect I nudged a croc clip and shorted something, but it's a really nice tape player (A Marantz CD330) so I didn't risk messing with the PWM kit any more. I used a potentiometer in series with the motor instead. It works pretty well: I can get down to about 30% speed before the motor stalls. Though below about 60% speed the pitch starts getting really unstable, due to the motor straining.
I don’t understand this comment. I looked it up and it’s a cool track but it doesn’t have anything to do with this video. Were you thinking this was the song I slowed down on the tape?
I tried this mod but it plays back from super fast to even faster. Any ideas what I did wrong? I wired the board where it says motor into the motor port of the pwm and the voltage labeled part from the pwm Into the motor. Any help would be appreciated.
some PWM boards might have a trimmer or jumper pins select different ranges. Does your board have anything like that? I would also test by powering the PWM board directly from the batteries to see how it responds. Does it go faster and slower but just not in correct range? If so you could try feeding less voltage into the PWM board.
Wow thanks for the fast reply. It Does adjust but in highs only. I’m very new to electronics so I’m not sure about those features or even how to reduce voltage. This is the one I am using. www.amazon.com/UMLIFE-Controller-Control-Switch-Dimmer/dp/B098B2LRSK/ref=mp_s_a_1_5?crid=3AUMG4N784Q6L&keywords=pwm+dial+20khz&qid=1660085035&sprefix=pwm+dial+20khz%2Caps%2C146&sr=8-5
Hey, not sure if you’re still seeing comments on this video, but I just finished the mod and there’s a loud crackling to the speaker. Do you know what this might be caused by? Perhaps an inadequate PWC?
Hmmm, I’ve never had that issue come up and I’ve done this mod a ton of times. I doubt it would be the PWM board. But to be 100% sure I would temp disconnect the positive wire going to the PWM board to see if the cracking goes away. Then reconnect to see if the cracking happens again. The PWM does cause a bit of motor noise to come through the speaker when running at high speed but it doesn’t sound like cracking at all.
Ended up buying a whole new cassette player, this one was DD instead of belt driven, and it worked perfectly this time. Not sure if mechanism has anything to do with it but that’s the only thing that changed. Thanks for the help! Awesome mod🙌🙌
Anyone knows if the PWM controlled DC output of the Koma Elektronik Field Kit could be used instead of the extra circuit? So i could basicaly power the motor with the Field Kit?
Thanks for this tutorial. I do this Mod to a Nokia SL 813 Tape Recorder. Everything works fine but now the speaker is buzzing when the motor starts... anyone can help me out?
I would think a potentiometer wired between the motor positive side ....then turn the motor speed all the way up with the internal speed control...then control it with the potentiometer.
![สาวเมืองเพชร - ธีเดช ทองอภิชาติ [Official MV]](http://i.ytimg.com/vi/kEt7F9PvO3I/mqdefault.jpg)
This video pleases the vaporwave gods. Thank you for your offering.
Dude you’re a legend thank you
Doing my first cassette mod by following this video! Wish me luck!
You got that pot desoldered so easily. It's hard to get that thing off...
Great content Mike. Your videos always get me pointed in the right direction. I have copied your bends many times with great success. Thanks for sharing. I miss MOOGFEST this year!!!! :-(
john hardig Thank you very much. That is awesome to hear! Now I’m curious, which bends of mine have you done? Any videos?
@@SISKworks I used your Moogfest/harp delay circuit bends to make a eurorack delay module. I am also inspired by your use of ribbon cable. You turned me on to using pre-made inexpensive circuits to add functionality to my bends like changing out the capacitors in a function generator circuit to make an LFO. I also made myself a Hellophone microphone. And now I am working on using the LTC1799 to add a pitchbend wheel to a CASIO sa-76 project. The CASIO SA-76 sounds so good even without modification. I have eight of them sitting on a shelf. I would love to send you one or two of them for free. sorry no videos, I spend all my free time watching you and Kristian Bladsol and soldering. Let me know if you want some free Casios.
@@johnhardig9754 BTW this makes me so extremely happy to hear!
If some of you want to build this, pick a PWM controller with at least 20kHz but not much higher (not 100kHz or something like that) If your PWM controller is bellow 20kHz it will produce an audible noise.
Sirius360 Thank you so much for this! This has been driving me crazy why this unit makes that noise but another one with a different model PWM board does not. I’ll have to try and dig up the specs on each to confirm but I suspect this is my issue. Thanks again. I really appreciate it!
Hi,
I just installed a pwm on a cassette machine and it is causing an awful popping/buzzing sound which goes up in pitch as the tape speed increases.
I checked the khz and it is maximum 25khz so should be within the range you suggest.
Do you know what could be causing this? Grounding? EMF interference?
Any advice would be really appreciated! Thank you!
@@mark_fox_music Sorry for the late response. If the noise goes up in pitch as the speed increases, it's propably the motor itselfe which makes that sound. The frequency of the pwm controller should stay constant. To get rid of the motor noise is a bit tricky. I had the same problem on one of my cassette players. I ended up using a different power supply just for the motor so the motor is not connected to the cassette circuit.
I commented earlier assuming this suggestion was for the pot value but now that I have read a little more it seems like pwm frequency is different? Do you know of a specific model that would work best for this type of mod?
@@idlefingerboards2629 i have used this one and it works great:
a.aliexpress.com/_mMsGA2d
i have moded 3 cassette decks already. sometimes the slower running motor can introduce noise in the system. you will hear a pitch which is higher when the motor runs faster and lower when it runs slower. this is not the fault of the PWM controller.
in one unit it was really loud so I bought a different power suply just for the motor. so my whole deck runs off the normal power supply except the motor and pwm controller. because of that no motor noise can reach the system and distort my sound.
I hope you won't have to do that. but just in case you run into this problem
Very Nice
Hi, I found this after watching one of your tape bent bids on a bending Facebook group. Nice instructable. I have now bought the correct own circuit board, and realised that you need to rip out the motor PCB, thanks.
Yes you would have to bypass the internal voltage controller that is located INSIDE the motor. I think it should also work without bypassing but you just won’t have as wide of range of control.
@@SISKworks you're quite right, I did this with a shoe box style deck, I'd picked the wrong PWM circuit board and the range was small, no high speed, and the pot behaved like a hair trigger on the small amount of control it had. I'll be revisiting the project again now, and I'm going to revisit an old oil gobbo light projector, I tried the pwm hack on the gobbo wheel motor, didn't even turn, hopefully it'll work now.
thank you! I made the same polarity mistake on the motor side but thanks to this I knew what to do right away.
I did this mod again just last week and thought I was being super careful to keep track of polarity but somehow once AGAIN it was backwards. I almost wonder if these PWM board just always need to be wired in reverse or something. Or maybe I just wasn’t understanding the original circuit that I bypassed.
I just finished this project. It came out really nice! I got one of those red 20kHz PWM boards. I had such a hard time desoldering the pot (I destroyed one board, the pads and the lanes came off) so I had to put it in a box on the outside. I’ll try to get better at desoldering components before I do this project again.
Oh that makes me so happy to hear that other people are doing my projects. That is so great! As far as desoldering goes, I always makes sure to add more solder first before trying to remove the old. Seems odd but it really helps.
Do you have a link to the red 20kHz board you used?
@@SISKworks Yes I do, www.lightinthebox.com/en/p/au-pwm-dc-motor-speed-controller-5v-35v-5a-led-light-regulation-dimmer-switch_p7931785.html?prm=1.5.1.30
In the last unit I modified I was able to fit the whole board inside the case. I haven't been able to desolder the pot from these boards yet but it probably says more about my desoldering skills than the board. I just upgraded to a rework station so we'll see if the new equipment will save me.
@@themidithief4514 thank you!
Thanks to this video, I just successfully modified my tape recorder. Cool shit 👍
I did this, and it worked! Nice
Thanks for sharing your this! Your creations are awesome
Nice, thanks for sharing! I feel like this is a stupid question: what's the difference between using a PMW board and just adding in a pot before the motor? I'm guessing the PMW allows you to boost the speed (add more voltage and/or current?) but the pot would just allow you to cut what's being drawn, so okay to slow but wouldn't speed up? And with the PMW board, at the lowest range can it cut the motor, or does the PMW board prevent that? Thanks for any tips, got some tape decks ready for modding!
I have the same question!!
I too have the same question....
well if you guys didnt find out.
basically, the motor requires a certain voltage to work properly. therrfore reducing the input voltage would not be a reliable way to slow the motor down.
instead you use PWM to essentially turn the motor on many many times a second
google pwm and duty cycle :)
Superb video and instrucition! Really enjoyed the music too
What a clever solution. Thanks for sharing. Can you please share a link for the PWM you used?
I’m inspired to try this thx for sharing!
This is a really cool video and I have always wanted to do this myself but I think I’m gonna break something lol and I also don’t have a soldering iron
Thank you for the help! Subscribed! Ihave one more question which is Im adding a headphone jack in place of the speaker. Do I need to ground it?
Well I’m not exactly sure what you mean. One of the speaker wires should already be ground. That is just how circuits work. So if you use the same wires to make your new headphone output then it will already have a ground. So no additional ground needed.
Hey awesome vid and great result. Which spec PWM board did you use for this?
I’m not really sure which one I used here since it was a few years ago. Just search Amazon for “Aobao DC motor PWM speed controller”
Thanks. One final question.
What if you want to play the tape back at normal/standard speed. Do you add a switch or?
@@-______-______- you would just have to figure out where on the knob it sounds “normal” speed and mark that position.
This is excellent! Could you please provide links to the PWM board, or more specifics as to which one it is? There are a lot to choose from.
Oh yeah. I didn't include any of that did I. Well now that I look back I see I actually bought on ebay and can't find them again. But looking on amazon these would also work. These are better than what I used because they are smaller.
www.amazon.com/dp/B07W5NZPH1/ref=sspa_dk_detail_6?psc=1&pd_rd_i=B07W5NZPH1&pd_rd_w=ghWRj&pf_rd_p=45a72588-80f7-4414-9851-786f6c16d42b&pd_rd_wg=6b0B1&pf_rd_r=8R7B1CSMV2P8V7AH3HN7&pd_rd_r=c4a5f04f-d711-4bbe-996a-e7980cac59ee&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFXT0E5V1VXTFlWMFYmZW5jcnlwdGVkSWQ9QTA0MDMzNDUyRzlOQTY4RFVXTEhLJmVuY3J5cHRlZEFkSWQ9QTA2NTYyNDIyS1RBMzBZTVo2MDdGJndpZGdldE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
Love the music, love the instructions. Just getting into this stuff soooo keen
I just built one of these and it works great! Any idea if this same idea would work on a turntable?
If the turntable had a DC motor then yes it will PROBABLY work. I’ve never opened a turntable so I don’t really know what type of motor they have. But don’t almost all turntables already have speed controls?
@@SISKworks they have different speeds depending on the size of the record and some turntables have a speed/pitch control as well but they have extremely limited ranges. However they also usually have a strobe sensor to keep them in time and idk if that would cause problems. I think I’m going to give it a shot!
@@broke8246 yea you should definitely give it a shot. I have turntables but they have already have a fairly wide range of speed on mine as they are more of a DJ type. I never thought to try modifying them even further though. Would be cool if you could get some super slow speeds. You can also try reversing the polarity to get the motor to spin backwards which can be cool with vinyl (not so much for cassette haha).
@@SISKworks would it not just play the tape in reverse?
@@broke8246 not exactly. Yes,the motor will spin in reverse but since tape players are only driven one way it will just eat the tape. I know from experience. Over and over. Haha.
Great video ! Many thanks for sharing.
Do you think it’s possible to mod a platine deck (with a 3-head)?
Yeah it should work on ANY device with a DC motor.
I know this is old, but, Great Video. I have a good condition Nakamichi BX-1. On the back indicates 50/60. Could I do this same thing? Same part?
No I don't think so. You need a player that runs on batteries.
What’s the song that plays starting at 4:00 for most of the video?
I not exactly sure. I speed it up enough that the algorithm wouldn’t hit me with a copyrighted violation and now I can’t even tell what song that was. I THINK I was listening to a DJ drum and bass mix so even if I knew which mix I probably still would not know what song. I just listened to that part multiple times and I still can’t make it out. Sorry.
Awesome video! Do you know if this would also work on a Tascam 414? I've popped the top off the motor and it looks the same but I don't want to wreck it. And is any PWM going to work? I found a Low Voltage DC PWM Motor Speed Controller Module 1.8V 3V-5V-6V 12V 2A S3Q4. Is that right? Thanks!
Simon the magpie just posted a speed modded cassette recorder with a kalimba on the lid on Instagram. Pretty freakin' nice. Can't wait to hear how it sound. I don't know what kind of resonance he will get in the cassette player body though.
Yeah I saw his Instagram post but I’m confused, does it still have a tape?
@@SISKworks I think the Kalimba is built onto the door so it can still open and play tapes.
@@NickGoblin yeah I saw the video after posting that. You are correct.
@@SISKworks Now I finally saw it too. The acoustic is not that great but I'd love to check out that project where they put the tape player inside the kalimba instead.
Just did this mod and it works great but what was the jumper at the end for again?
Sorry, I didn’t explain that very well. The original pot had a built in switch (clicks on when you first turn it clockwise). But I wanted the PWM board to turn on with player so I just put a jumper (on the PWM board) where the two switch contacts would be. Without the jumper I would need to send 5 wires to the speed control pot but with the jumper I only need to send 3 wires. Totally not needed though. Works either way. Thanks for watching and commenting. Love to hear it when other people build my projects.
hey, I'm wondering what the PWM actually does. Does it allow more/less current to flow through? If so, would it be possible to attach a CV-sequencer instead of the pulse width modulation?
The PWM board works by turning the power on and off really fast. A CV sequencer directly would not work. But you can connect a vactrol to the PWM pot and inject CV control that way. Ive done that a few times. Check out my KeyPlayer video
th-cam.com/video/rTYyPcacBzw/w-d-xo.html
Which did you use the Amazon add I saw comes with 6 or 4 different boards?
Yeah there are so many different versions. It’s hard to always find the same model since it seems they are made by a ton of different companies. This one looks exactly like the last ones I bought but is made by a different company.
www.amazon.com/UMLIFE-Controller-Control-Switch-Dimmer/dp/B098B2LRSK/ref=mp_s_a_1_18?keywords=PWM+Motor+Speed&qid=1696263034&sr=8-18
Very nice!
The pwm does not keep the speed constant, where the circuit in the motor/servo does, just wire an external pot into where the adjustment pot was on the motor pcb. Why make a simple job complicated.
how do you know which PWM controller to buy based on the motor?
I’ve got this working now. I’m confused about detaching the knob. What is the cable that I use to connect it to the pwm chip. And what is that red cable that is installed?
I used a piece of ribbon cable and pulled 3 wires off but you could also just use three individual wires. Red wire was to bypass the switch built into the potentiometer when you turn it. Removing that potentiometer is probably the hardest part. I’ve even damaged a board in the past doing it. So be gentle.
Hi there! Great video, big help. Quick question. Would this modification work on a tape deck?
Yes it should work the same way.
Just curious: If you would desolder the old motor speed, but still keep it powered, solder 2 wires from the lugs to a dpdt switch so you can switch between the newly soldered knob AND the old circuitboard, would that work? Or is the power going to the motor a part of how it works?
Yeah I would think that should work as long as the switch is wired between the motor and original speed controller.
@@SISKworks Ah awesome, thanks for your quick reply. Your tutorial is a lot better and more clear than others. Will be soldering away this weekend. If it doesnt work no biggie ofcourse, but I kind of like the idea of having 'normal speed' as a set setting instead of dialing it in
@@SISKworks broke off the tab of the original haha, let’s see if I can overcome laziness to fix it or just happy with the speed control ;)
Thx!
This is really cool. I did it on one machine but on the second, the motor looks all weird inside and I don’t see a PCb there. Any idea if maybe that part of the circuitry was outside the motor?
I’m not too sure. But you don’t actually NEED to bypass that circuit if you can’t find it. You just might not be able to get super fast speeds.
@@SISKworks Thanks, Hopefully I can put this motor back together lol.
hmm, i have a few portable decks where the motor PCB is inaccessible due to the main board in the way. Is there any way to add one of these without ripping out the motor PCB itself? I can identify the wires from the motor itself..
Yes you can still do this without bypassing the motor PCB but you just won’t be able to get a fast speed.
This is interesting. How much can the motor be increased beyond normal cassette speed? I am wanting to at least double the speed so I can quickly duplicate and covert cassettes to digital in half the time. A bit faster is even better then after conversion I slow down the audio back to normal in my PC audio app.
If you bypass the internal regulator that is inside the motor (which I didn’t show) you can get fairly fast speeds. But I’m not sure if it double or not. If you are using it to record, one thing to be aware of is that the PWM board does add a bit of motor noise at higher speed to the audio which is not ideal. It seems The only way around that is to have a completely separate battery pack for just the motor.
Do many Radioshack decks like this have adjustable motor speeds ?
Almost all tape players have an adjustment inside the DC motor. But I’m am adding new speed adjust circuit and bypassing the one built inside the motor.
@@SISKworks Thanks Yes I understand just wondered if it was just this model or any flatbed cassette player. Thanks for your quick reply as it's quite an old post
@@mrfeenix1 the only players that I’ve found that don’t have that internal adjustment are super old/vintage players.
@@SISKworks Cool !! Time to go out and grab some tape machines !! Thanks :)
Nice!
Would this work with just a normal pot?
No not really. With a normal pot you might be able to get the tape to slow down just a little bit and then it will stop. You would only have a SMALL amount of control. But with a PWM board like I show you get a big range of control. From faster than normal all the way down to a super slow crawl. That is just NOT possible with only a pot.
What exactly does that tiny PCB inside the motor do? I'm trying this mod at the moment, and the casing on my motor seems to be crimped shut so I can't get into it without wrecking the motor. I'm going to try cutting the wires going into the motor, and putting the PWM kit there instead, and hopefully the little board won't interfere with it working.
I know this comment is old, but as I understand it this won't work. The wires going to the motor are just power, wheras this is actually altering the circuitry inside the motor itself.
@@EpicStuffMan1000 Thanks!
I tried putting the PWM kit on the wires going into the motor, and it worked. A pulse width modulator is just something that switches the power on and off at high frequency, so it makes sense that this works. However, I was getting a high-pitched noise, which I think was EM interference from the motor, and then the fuse suddenly blew on my tape player. That was probably unrelated! I suspect I nudged a croc clip and shorted something, but it's a really nice tape player (A Marantz CD330) so I didn't risk messing with the PWM kit any more.
I used a potentiometer in series with the motor instead. It works pretty well: I can get down to about 30% speed before the motor stalls. Though below about 60% speed the pitch starts getting really unstable, due to the motor straining.
Part of The Noise - Xinobi Remix. For anyone wondering
I don’t understand this comment. I looked it up and it’s a cool track but it doesn’t have anything to do with this video. Were you thinking this was the song I slowed down on the tape?
I want to make a separate circuit in the form of a dirty tape, where we can sell the output sound of the MP3 player slowly.
I tried this mod but it plays back from super fast to even faster. Any ideas what I did wrong? I wired the board where it says motor into the motor port of the pwm and the voltage labeled part from the pwm Into the motor. Any help would be appreciated.
some PWM boards might have a trimmer or jumper pins select different ranges. Does your board have anything like that? I would also test by powering the PWM board directly from the batteries to see how it responds. Does it go faster and slower but just not in correct range? If so you could try feeding less voltage into the PWM board.
Wow thanks for the fast reply. It Does adjust but in highs only. I’m very new to electronics so I’m not sure about those features or even how to reduce voltage. This is the one I am using.
www.amazon.com/UMLIFE-Controller-Control-Switch-Dimmer/dp/B098B2LRSK/ref=mp_s_a_1_5?crid=3AUMG4N784Q6L&keywords=pwm+dial+20khz&qid=1660085035&sprefix=pwm+dial+20khz%2Caps%2C146&sr=8-5
Hey, not sure if you’re still seeing comments on this video, but I just finished the mod and there’s a loud crackling to the speaker. Do you know what this might be caused by? Perhaps an inadequate PWC?
Hmmm, I’ve never had that issue come up and I’ve done this mod a ton of times. I doubt it would be the PWM board. But to be 100% sure I would temp disconnect the positive wire going to the PWM board to see if the cracking goes away. Then reconnect to see if the cracking happens again. The PWM does cause a bit of motor noise to come through the speaker when running at high speed but it doesn’t sound like cracking at all.
Will try that, my PWM is also right at 20 khz so it may need to be higher, saw a comment about it causing extra noise if it’s lower than 20 khz
Ended up buying a whole new cassette player, this one was DD instead of belt driven, and it worked perfectly this time. Not sure if mechanism has anything to do with it but that’s the only thing that changed. Thanks for the help! Awesome mod🙌🙌
Anyone knows if the PWM controlled DC output of the Koma Elektronik Field Kit could be used instead of the extra circuit? So i could basicaly power the motor with the Field Kit?
Yes I’m fairly certain that will work. Pretty sure I saw a video with someone doing exactly that.
@@SISKworks i tried now, and it works perfect. Now i can sequenz the motor speed. :-)
@@martinreim4805 awesome. I really wish I had that Field Kit too.
instant-vapourwave
Anyone tried this on micro cassette? I somehow have 3 machines, and about 20 tapes.
I drilled a hole in the top of my recorder and stuck a screwdriver into the motor speed control.
That works! But if you use a PWM board you can get a much bigger range of control.
Thanks for this tutorial. I do this Mod to a Nokia SL 813 Tape Recorder. Everything works fine but now the speaker is buzzing when the motor starts... anyone can help me out?
Is buzz only when the tape is slowed down? Could be that the lower frequencies are harder for the speaker
This how dj screw did it …. Not with turntable pitch control
I would think a potentiometer wired between the motor positive side ....then turn the motor speed all the way up with the internal speed control...then control it with the potentiometer.
No, you won’t get very good range of control that way.
Yoshi