Moog Highpass Transistor Ladder Filter - DIY Modular in a Week 7.5
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- Here is a really nice sounding highpass filter. The character is very organic or voice like with a throaty or nasal sound to it. It is very different in the sound from the other filters we have done before. This is however a very difficult filter to build with loads of components, 8 opamps amongst others, and 4 of these has 2 transistors connected to them each! So not a build for the novice... But if you have done all the other modules in this series, you should be ready for this... ;)
Day 7: Filters
Part 5: Moog inspired Highpass filter
Difficulty: Hard
Price: ~12$
MiaW playlist: • Modular In A Week (MIAW)
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Link to the schematics:
www.synthdiy.co...
Link to the frontpanel design:
www.dropbox.co...
Buy components from one of my favorite seller on ebay below:
Buy 10pcs of LM13700 for 5$ here:
rover.ebay.com...
And a bunch of 2N3904 and 2N3906 for 1$/100pcs here:
2N3904: rover.ebay.com...
2N3906: rover.ebay.com...
Link to oscilloscope:
rover.ebay.com...
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Great video. Couldn't find this anywhere.
At first I was like: "Hey, nice suspenders Kristian!" but then I noticed... :D I bet this will go great with one of the low pass filters to make these quacky band pass noises.
Haha, I will forever refer to patch cables as suspenders from now on... :D Apropo quacking, todays filter has some true duck like sounds ;)
I was hoping to see the ladder filter😊
Excited!!
Wow. That is a far beyond nice filter :-)
The transistors... I had them for free (100 pack each)!! I asked for free samples, I don't remember if they came from Texas Instruments, onSemi, Fairchild, ... it was worth trying!! :) Beautiful filter. Maybe, organizing the transistor array in a different way could easen the job. But, as usual, you made a really great job. Now I'm wondering if using ALPHA 9mm potentiometers would allow for a 2HP arrangement...
Congrats to free samples. That doesn’t happen that often anymore. You like it even tighter on the panels than me. :) I think alps pots definitely would make it possible to accommodate it on a 2hp panel.
great filter! didn´t know it! genius!
Yes it is a very nice filter. Sound very "different" than the others I built. I can highly reccommend it.
Very nice! I am going to try to build this. Other than adding the caps, did you change any other values from the EFM schematic?
I only added the caps. :)
Sounds great Kristian! I love yhe sound tests. But jave you considered making some more musical videos with patches showing off what the modular can do as it develops?
Sure. I have the “jam sessions” or patch tests at the end of each “day” so I’ll do that after next weeks episode. :)
Also it isnt as "musical" as I would like right now. For that I need a few more "synced" things, like a sequencer and clock dividers, so that is something I need to add "soon" ;)
@ Don't stress it Kristian. It is interesting to hear what the setup can do of course, but the build videos are fantastic.
I call it inspiration to build more modules ;)
Just comparing the schematic to the parts list. A few discrepancies. Schematic show 22pF coupling caps but quantities don't match. Also other resistor quantities don't match. Any suggestions?
what voltage use for upward arrows and downward arrows and ground?? there's no info in the squematic :c
Hey Kristian, questions. The schematic appears to show polarized capacitors, is this correct? Also, the resistors from the ladder, do they all connect to +12V?
I wonder how it could be reconfigured as Low Pass.
Not sure it would work? But there are so many low pass filters out there. This one has such a different sound so it’s nice to have it along with all the low pass filters. ;)
@
Kristian! Nice to hear from you.
I shall build it for sure as a HPF. I have been working on making a PCB layout for me to etch, using DIYLC software.
It does not have too many parts compared to some other filter schematics.
There are some circuits that can be modified to become HPFs... So it makes me wonder if a HPF an be modified to be a LFP... But my knowledge of circuit design is not enough yet.
Yes many other designs out there. The Moog Tauraus schematic is available
www.muffwiggler.com/forum/viewtopic.php?p=1292485
Peace
Finally wrapped this up and no nothing. Completely dead :(. So then I checked around the net and it appears that the downward arrows from the ladder go to -12v (up arrows to +12v). Is this correct? I'm going to see if I can rework my board and try this. If so, I will let you know. Thanks
And it's correct??
@@bereshit4272 This was a while ago, but I think it is true that the down arrow goes to negative and up to positive. I never got this to work. I then ordered PCBs from someone online and that didn't work either. I've gotten most modules to work fine, so not sure what I was doing wrong with this one. At some point, I'll come back to it and try again. Good luck!
How do you like that oscilloscope? The price feels almost too good to be true, but it looks like it has good enough features.
For audio applications it is enough at least for me. I can probe around for signals and see waveforms. They do have one that is a bit more expensive that can be plugged into a computer as well and save measurements etc. Only thing might be that the cables are a bit short. But buying a new better probe is of course an option to solve this. 😅
Built it, my build sounds way, way worse than yours. Q, did you match transistors?
Sorry for late reply. But no I didn’t match transistors. Although I guess they were from the same batch at least. Did you add the extra capacitors?