Excellent, just excellent! I just received my Kenwood TM-221A back from my brother who had been using it for a few years. The internal lithium battery was dead and both of the pilot lamps in the LCD display were burned out. I was thinking about using LEDs to replace the original pilot lamps. After watching your video, I will go with the LEDs for sure. Using 3500K LEDs was a great tip that will help keep the display looking original. Thank you so much for the detailed explanation. Much appreciated! Salome
Great job Peter. During my repair I change bulb lamp with LED, I have done it in TS-940's meter, G800' s Yaesu controller and so on. Great solution. Thanks. 73s Pasquale IW0HEX
Nice job Peter. The diffused LED bulbs do make for a lot less work. Another thing to keep in mind when using LED's is the lens focus angle. A problem I see a lot is people using the dome type LED's that have rather tight beam patterns which make bright or hot spots on meters. Often switching to a flat top 120º lens prevents bright spots and more evenly distributes the light.
Peter I have a yaesu ft2500 mobile radio. The bulbs have all burnt out. Which led would you recommend ? I think they carry anywhere from 5-11v 🤷🏼♂️ 3mm
Wow, this looks beautiful. I can't understand how i did not think of this earlier. I am going on ebay and ordering a bag of 5mm diffuse warm white LEDs, i have to do this to my Philips scope. It uses 2 light bulbs to illuminate the grid, one of them was burnt out since i got it. I tried a white LED but it did not look good with the yellow bulb so i put a red one instead, that gives good contrast but it is weaker than the light bulb that is still good so it looks weird. I am going to replace both the bulb and the current red LED that i put on the right with 4 warm white LEDs (2 will not be enough i think) and maybe make a video of the results. :) Thank you.
Nice simple incandescent to LED substitution Peter; next time the light bulb sets in my old TS-940S go out I'm going to shift them over to LEDs so I don't have to do that fix every few years. 73 - Dino KL0S
Hi Peter, Great job and video. Good to know those LEDs are available. Thanks for the information. That display looked very nice after LEDs installed. 73
Hi Peter thanks for the vid. Was wondering if you could help me my Kenwood T-58L tuner backlight is not working being a woman I don't know the name of the bulb to get, can you help me please. Your video is very good after watching I feel confident enough to attempt fix it myself.
Thank you very much indeed Peter this is very nice information for me to change the ageing backlight display of my FT1000 MP MKV which I am having problem looking for the backlight replacement. I can now put the LED in line soldered in a small PCB using your calculation to obtain a good looking display again and the radio will be back alive again
Interesting project, thank you for the video. I also like replacing light bulbs or el panels from older equipment panels with LEDs. In fact I am currently working on replacing the el backlight panel from an older Keithley 197A bench multimeter.
Hello nice video, I have a same problem in a panasonic CQ-JS0720F radio, do you have or do you know where I can find datasheet or electric schematic that radio? Thank you
Hi Peter, as always, a verry good video with excellent explaining how to calculate the resistor for one or more LED´s. But, you should also have to explain the polarity (how to find them ;-)....). In some cases this is not respected by the hobbyists. 73 Bernd
Hi Bernd, thanks for feed-back! Yes you are right I have missed the part of polarity...Very good that you have mentioned it to the community! Thank you. All the best and Cheers
I always used to sand down the white waterclear LEDs to make them diffused. It seems odd that the milky white LEDs took so long to be produced. Thanks for the video.
Hi , Any advice about books about talking software architecture for microcontrollers ? - round robin - round robin with interrupt - function queue scheduling architecture - real time operating systems thanks
Thanks for the video. Im assuming that the supply on your board was D.C. which allowed your led replacements to work without rectification ? In my situation I want to replace the dial pointer lamp rated 8v 50 mA on my pioneer receiver with a another similar (non led) bulb because when i checked the supply to this bulb it measures 7.5 v ac . (Not dc ) . I have found s similar size bulb that fits in this tight space So I will have to replace with a regular (not led) bulb since it is ac . Cam you confirm if the same principle and formula would apply in rhe case of ac supply ? If so As per ohms formula you shared in this case the drop would be 7.5 v - 6 v = 1.5 v and the current being 50 mA the resistor value would be 30 ohms - can you confirm the above thanks very much again
I have to change those on my Tuner, there are 2 factors that I'm not sure about; I found the diffused white LEDs ....3.0-3.4V Forward Voltage, at 20mA current ...500+ mcd would those be good enough?
Hopefully I’m in the right place to ask this Q - The LED backlight in many radios (like the walkie-talkie FRS types) have an automatic shut-off after a few seconds to save battery. Is there a simple fix to defeat the timer so the backlight stays on? I’m guessing the timer is written into the device software and can not be DIY. - Thanks!
Great video. I'm going to do this job for my Kenwood TM-733. One of the bulbs is dead and therefore half of the display, because they are connected in series, 2 by 2.
Job done. Used the same resistor value of 390 Ohm. Replaced R26 and R27. They are on opposite sides of the PCB, so you will have to disassemble the front. Bend the LED leads as short as possible, because there is not much space. You can apply 13,8 V directly to the front for testing. It will turn on for 10 seconds and then turn off again because of failed communication. Long enough for testing and measuring.
I am interested in adding a dial light to my transistor radio. Can you advise me on how to do this, please? The radio is a Vega Selga 404. Thank you for your expert opinion, Lee.
Yes, when this radio came out white LEDs cost 5 bucks a piece, were made of silicon carbide, produced a sickly blueish hue and had almost no brightness. They could have gone with a amber ones though, but obviously they wanted the white background look. Would have been a good match in an Opel interior of the era.
+TRX Bench Hi again, Peter. I have a 1969 Peterson 520 Stroboscopic Instrument Tuner that has three neon indicator bulbs that illuminate the spinning strobe display with the flashing light typical of strobe tuners. I considered replacing the D2A (no longer available) neon bulbs with the LED board from a commercial LED light bulb. But, the neon indicator supply is 400VDC. The LED board from the light bulb only needs about 55VDC. That's a lot of volts to drop through a resistor.
Right. But, the problem is the load on the 400V power rail will be about 10.5 Watts @ 30mA. To be sure I don't exceed the 400V power supply's capabilities I'll have to estimate the original load on it. It was only three neon bulbs and two resistors, so not very much, I'd say.
Another well presented video Peter. It also helps justify to the xyl the benefits of my so called "time wasting" on utube. Onto another of your presentations...73s...Andrew ve1rae
A very clear and easy to follow video. Many thanks for taking the time and effort to put this video together. You have a 'thumbs up' from me and a new subscriber - M0SAT
I bought those LEDs (20mA 3.0V) on eBay, guess what nothing happened LOL, in the past I did replace those light bulbs on my Sony tuner with success (bought them at Radio Shack, now there is no Radio Shack anymore). Was very glad to find thid LED idea, Unfortunately the LEDs didn't work Booooooo
Your usual 5 & 9+ lecture... Ich bedanke mich sehr. As you have put SO much effort into learning your English, I am sure that you would be glad to receive a few tips, to polish it up, (polizist es) even further. You use the word serious which auf Englisch bedeutet 'Ernst'. The word which you need is "series". In English, just as in DL the second letter (e) is pronounced. My own problem is that my Münchner Ham friends are too polite to correct my komisch und komisc German and so, I DON'T LEARN! Keep up the good work.. You mini lectures are ganz ausgezeichnet! Do you give German lessons as well? Bis zum nächstes Mal. G drei NBY.
No mention that LED's have a positive and negative! How many of you have installed one and it's gone 'pop?' Remember, and this is for your information as well Peter, the shorter leg on an LED is the negative and the longer one is the positive.
Just because you know the polarity does not mean that everyone else does, you should have thought of that! Never assume that everyone watching this are electronic component 'experts', they are probably not.
@@timl576 I've put many LED lights in backwards and non of them have gone 'pop' unless you're running high voltages I don't think it matters. Obviously if you do put them on backwards, it just isn't going to shine.
Hallo Peter hab hier eine Elektronika Modell 360 leider hat se die Lagerung nicht ohne überstanden , hatte die hier mal bei einen angeblichen Profi :-) der sagte ist verbaut , nur ist da nix verbaut war das ori Bord . Hab gesehen das da Elkos sind beim NF IC die nicht ganz ori aussehen , sonst weiter alles ok klar Bauteile sieht man es ja nicht an außer Elkos , ok senden ging nur kurz und Empfang war da jetzt macht se weder senden noch Empfang denke die Elkos . Währe ein neues Video 👍🏻
Excellent, just excellent! I just received my Kenwood TM-221A back from my brother who had been using it for a few years. The internal lithium battery was dead and both of the pilot lamps in the LCD display were burned out. I was thinking about using LEDs to replace the original pilot lamps. After watching your video, I will go with the LEDs for sure. Using 3500K LEDs was a great tip that will help keep the display looking original. Thank you so much for the detailed explanation. Much appreciated! Salome
Great work. Thank you for introducing these diffuse LEDS as replacement for "peanut" bulbs.
Thumbs up!
Thanks for feed-back and watching 73
Great job Peter. During my repair I change bulb lamp with LED, I have done it in TS-940's meter, G800' s Yaesu controller and so on. Great solution. Thanks. 73s Pasquale IW0HEX
Hi Pasquale, yeah it is really a good choice to swap to LED's. Thanks for stopping by. 73
Beautiful job Peter. Well explained. It is always a good idea to change them old nasty lamps with led's. Thanks for sharing my friend and 73.
Hi Buddy, yes this old lamps are most annoying so I always use LED's these days. Thanks for stopping by my friend 73
Nice job Peter. The diffused LED bulbs do make for a lot less work. Another thing to keep in mind when using LED's is the lens focus angle. A problem I see a lot is people using the dome type LED's that have rather tight beam patterns which make bright or hot spots on meters. Often switching to a flat top 120º lens prevents bright spots and more evenly distributes the light.
Hi Mike, yes totally agreed. Thanks for the additional contribution. Thanks for stopping by. 73's
Peter, this video is well thought out and well presented. Thanks.
Hi John, thanks for watching 73
Looks great, no hot spots, lighting is very even. Excellent job.
Thanks for watching
Peter I have a yaesu ft2500 mobile radio. The bulbs have all burnt out. Which led would you recommend ? I think they carry anywhere from 5-11v 🤷🏼♂️ 3mm
Wow, this looks beautiful. I can't understand how i did not think of this earlier. I am going on ebay and ordering a bag of 5mm diffuse warm white LEDs, i have to do this to my Philips scope. It uses 2 light bulbs to illuminate the grid, one of them was burnt out since i got it. I tried a white LED but it did not look good with the yellow bulb so i put a red one instead, that gives good contrast but it is weaker than the light bulb that is still good so it looks weird.
I am going to replace both the bulb and the current red LED that i put on the right with 4 warm white LEDs (2 will not be enough i think) and maybe make a video of the results. :) Thank you.
Nice simple incandescent to LED substitution Peter; next time the light bulb sets in my old TS-940S go out I'm going to shift them over to LEDs so I don't have to do that fix every few years. 73 - Dino KL0S
Hi Dino, yes totally agree it is a simply job and looks nice and it is longer lasting... Thanks for watching 73
Nice job Peter and very nice clean soldering.
Thank you Gary 73
Hi Peter, Great job and video. Good to know those LEDs are available. Thanks for the information. That display looked very nice after LEDs installed. 73
Hi Larry, yeah really looks nice and good that this LED's are now available. Thanks for watching 73
Wow, that looks amazing Peter!! The display is VERY crisp!!! Fantastic!
Hi Brian, yeas you are right the display really looks great. Thanks for watching. 73
Hi Peter thanks for the vid. Was wondering if you could help me my Kenwood T-58L tuner backlight is not working being a woman I don't know the name of the bulb to get, can you help me please.
Your video is very good after watching I feel confident enough to attempt fix it myself.
Thank you very much indeed Peter this is very nice information for me to change the ageing backlight display of my FT1000 MP MKV which I am having problem looking for the backlight replacement. I can now put the LED in line soldered in a small PCB using your calculation to obtain a good looking display again and the radio will be back alive again
Glad that the video was of any help! Thanks for feed-back 73
Very nice work Peter. Neat soldering with some maths thrown in for good measure
Thanks for feed back! 73's
Interesting project, thank you for the video. I also like replacing light bulbs or el panels from older equipment panels with LEDs. In fact I am currently working on replacing the el backlight panel from an older Keithley 197A bench multimeter.
Hi, thanks for feed-back. Yeah would be interesting to see your Keithley project. Take care Cheers
Hello nice video, I have a same problem in a panasonic CQ-JS0720F radio, do you have or do you know where I can find datasheet or electric schematic that radio? Thank you
Sorry no schematic in my files
Fantastic video! Thank you for sharing. I'm really excited to try this repair on my TS-2000. 73 Jake VK3FJBO
Hi Peter,
as always, a verry good video with excellent explaining how to calculate the resistor for one or more LED´s.
But, you should also have to explain the polarity (how to find them ;-)....).
In some cases this is not respected by the hobbyists.
73 Bernd
Hi Bernd, thanks for feed-back! Yes you are right I have missed the part of polarity...Very good that you have mentioned it to the community! Thank you. All the best and Cheers
I always used to sand down the white waterclear LEDs to make them diffused. It seems odd that the milky white LEDs took so long to be produced. Thanks for the video.
Hi ,
Any advice about books about talking software architecture for microcontrollers ?
- round robin
- round robin with interrupt
- function queue scheduling architecture
- real time operating systems
thanks
Hi Steve, I have no idea why it took so long to get them on the market but glad to have them now :-) Thanks for watching Cheers
Nice well done job.. I normally use amber LEDs for this to get that nice warm look ...it's much better than the glaring white ones in this application
Hi, thanks for watching, yes the glaring white are not so good for this purpose.. 73
Thanks for the video. Im assuming that the supply on your board was D.C. which allowed your led replacements to work without rectification ?
In my situation I want to replace the dial pointer lamp rated 8v 50 mA on my pioneer receiver with a another similar (non led) bulb because when i checked the supply to this bulb it measures 7.5 v ac . (Not dc ) . I have found s similar size bulb that fits in this tight space So I will have to replace with a regular (not led) bulb since it is ac . Cam you confirm if the same principle and formula would apply in rhe case of ac supply ? If so As per ohms formula you shared in this case the drop would be 7.5 v - 6 v = 1.5 v and the current being 50 mA the resistor value would be 30 ohms - can you confirm the above thanks very much again
LEDs don't require rectification...they are Light Emitting DIODES, and rectify by their very nature.
Thank you, just did this with my Kenwood TS-130V, SWR/PWR and VFO lights, worked just fine!
Glad that the video was helpful to you. Thanks for feed back 73
I have to change those on my Tuner, there are 2 factors that I'm not sure about; I found the diffused white LEDs ....3.0-3.4V Forward Voltage, at 20mA current
...500+ mcd would those be good enough?
Hopefully I’m in the right place to ask this Q - The LED backlight in many radios (like the walkie-talkie FRS types) have an automatic shut-off after a few seconds to save battery.
Is there a simple fix to defeat the timer so the backlight stays on?
I’m guessing the timer is written into the device software and can not be DIY.
- Thanks!
No diodes. Will it flicker? Is the power supply 11.6 AC?
It's a Light Emitting DIODE and rectifies by its very nature.
couldnt've understood better than this, great video
Great video. I'm going to do this job for my Kenwood TM-733. One of the bulbs is dead and therefore half of the display, because they are connected in series, 2 by 2.
Job done. Used the same resistor value of 390 Ohm. Replaced R26 and R27. They are on opposite sides of the PCB, so you will have to disassemble the front. Bend the LED leads as short as possible, because there is not much space. You can apply 13,8 V directly to the front for testing. It will turn on for 10 seconds and then turn off again because of failed communication. Long enough for testing and measuring.
Another great work, Peter.
Thank you Nuno! 73
Very well done Peter big improvement
Yeah I like it too. 73
I am interested in adding a dial light to my transistor radio. Can you advise me on how to do this, please? The radio is a Vega Selga 404. Thank you for your expert opinion, Lee.
Yes, when this radio came out white LEDs cost 5 bucks a piece, were made of silicon carbide, produced a sickly blueish hue and had almost no brightness. They could have gone with a amber ones though, but obviously they wanted the white background look. Would have been a good match in an Opel interior of the era.
The display looks great. Thanks for explaining it to us.
Yes I think it is really nice.. 73
+TRX Bench Hi again, Peter. I have a 1969 Peterson 520 Stroboscopic Instrument Tuner that has three neon indicator bulbs that illuminate the spinning strobe display with the flashing light typical of strobe tuners. I considered replacing the D2A (no longer available) neon bulbs with the LED board from a commercial LED light bulb. But, the neon indicator supply is 400VDC. The LED board from the light bulb only needs about 55VDC. That's a lot of volts to drop through a resistor.
That is no problem just Test out the current with 55V and than you can calculate the resistor for 400v 73
Right. But, the problem is the load on the 400V power rail will be about 10.5 Watts @ 30mA. To be sure I don't exceed the 400V power supply's capabilities I'll have to estimate the original load on it. It was only three neon bulbs and two resistors, so not very much, I'd say.
Nice job!!! 👍
Very nice Peter ! Once again a great teaching video! 73's de K8KEM
Thanks for watching David 73
Nice job again Peter. Thank you
John
Thanks John! Cheers
Great work. Everything you do is so impressive.
Excellent Peter.
Thanks Howard 73's
great job showing resistor calculation!
KK4ZIU
Thanks for feed-back. All the best and 73
Excellent job, should also help the display run cooler.
Thank you Andy! 73
Do you have a link where to buy this LEDs?
ebay, search for defuse white led
Great video Peter. We all know my great love affair with LEDs lol. Hope you are well.
George
LOL yes your great love affair...very nice. Thanks for watching George. All cool here hope you are well too! 73
Nice job. Would be great to get a link to the LEDs. Thanks for all your videos.
Hi, well it is off ebay. Simply search for white 3mm diffuse LED... Hope that helps. 73
Found them. Thanks.
Another well presented video Peter. It also helps justify to the xyl the benefits of my
so called "time wasting" on utube. Onto another of your presentations...73s...Andrew ve1rae
LOL that's great Andrew, hope your wife is convinced.. Thanks for watching and comment 73
Excellent Peter, danke.
No problem, thanks for comment and watching Cheers
Looks nice. Thanks Peter.
Thank you Robert!
size of those LEDs? What direction were they installed? hmmm...
It's probably safe to assume that the cathode is connected to the large ground plane.
@@brianhall137 I ordered LEDs and resistors and did this to update to my 742A
Excellent,thank you for this. Gonna do this to my Trio now
Thanks for feed-back 73
Great video I did it on my CB and Ham radios set.
Thanks for feed back 73
very nice upgrade they will last long
Hi Dennis, yes the will last loger. Thanks for watching 73
A very clear and easy to follow video. Many thanks for taking the time and effort to put this video together. You have a 'thumbs up' from me and a new subscriber - M0SAT
Glad that you like it Dave! Welcome to my channel and thanks for sub. 73
Peter can you let me know the type of LEDs pls?
search for led diffuse white on the web...
I bought those LEDs (20mA 3.0V) on eBay, guess what nothing happened LOL,
in the past I did replace those light bulbs on my Sony tuner with success (bought them at Radio Shack, now there is no Radio Shack anymore).
Was very glad to find thid LED idea, Unfortunately the LEDs didn't work Booooooo
Very nice job..
Thank you ! Cheers
Your usual 5 & 9+ lecture... Ich bedanke mich sehr.
As you have put SO much effort into learning your English, I am sure that you would be glad to receive a few tips, to polish it up, (polizist es) even further.
You use the word serious which auf Englisch bedeutet 'Ernst'.
The word which you need is "series".
In English, just as in DL the second letter (e) is pronounced.
My own problem is that my Münchner Ham friends are too polite to correct my komisch und komisc German and so, I DON'T LEARN!
Keep up the good work.. You mini lectures are ganz ausgezeichnet!
Do you give German lessons as well?
Bis zum nächstes Mal.
G drei NBY.
Thank you! always open for tips! 73
Great video.
Thanks for feed-back Cheers
You where the guy that I made do my homework lol
Beauty
Nice work
Subscribed
beautiful work
Thank you Fred! 73
Does someone know this incandescent light bulb number ?
How many watts is the resistors?
It is a 1206 resistor Michael 73
No mention that LED's have a positive and negative! How many of you have installed one and it's gone 'pop?' Remember, and this is for your information as well Peter, the shorter leg on an LED is the negative and the longer one is the positive.
Tim L i think the people who watch this video know how a LED works :(
Just because you know the polarity does not mean that everyone else does, you should have thought of that! Never assume that everyone watching this are electronic component 'experts', they are probably not.
@@timl576 I've put many LED lights in backwards and non of them have gone 'pop' unless you're running high voltages I don't think it matters. Obviously if you do put them on backwards, it just isn't going to shine.
Source and part number for these LEDs? I can't seem to find any thru-hole small diffused warm white LEDs from any online distributor.
Hi, I have found it on ebay. Hope that helps. 73
looks really good
Thank you for watching.
How many volt output is resistor
It always depends on the radio. You have to adapt the resistor always with any different radio 73
Viewed prior to this a person put 6V bulbs into 8V sockets, needless to say the outcome was very cooked, fried.
perfect job ;)
Thank you Neto! 73's
Hallo Peter hab hier eine Elektronika Modell 360 leider hat se die Lagerung nicht ohne überstanden , hatte die hier mal bei einen angeblichen Profi :-) der sagte ist verbaut , nur ist da nix verbaut war das ori Bord . Hab gesehen das da Elkos sind beim NF IC die nicht ganz ori aussehen , sonst weiter alles ok klar Bauteile sieht man es ja nicht an außer Elkos , ok senden ging nur kurz und Empfang war da jetzt macht se weder senden noch Empfang denke die Elkos . Währe ein neues Video 👍🏻