Wow, this brings back memories. I was 12 in the 70's when my dad got a box of junk from a garage sale and in it was something with a potentiometer, RCA plug, and 3 strands of Xmas lights with 4 bulbs each. I assumed it was a Color Organ and since the outside Xmas lights were plugged into my bedroom, I decided to plug them into one of the strings. The outside lights blinked to the music, and 5 seconds later all the smoke escaped from some parts on the parts. My dad repaired it, gave me a short lesson on electronics, and I have been hooked color organs ever since. I still own a Heathkit TD-1006 and now build them using ESP-32's. Thank you!

@GadgetReboot

2 жыл бұрын

I want to expand upon the concept and try getting some addressable RGB LEDs going, and maybe ESP or Teensy doing digital filtering, but I have some more analog level stuff in mind too. I used to have a Heathkit stereo receiver that was given to me already assembled in the 80s. Now I wish I still had it.

@scottbc31h22

2 жыл бұрын

I had a unit that was in an 8" x 6" x 4" box, with one indoor xmas light as an indicator for each channel. The unit also had outputs that drove up to 100 watts (if memory serves). I set it up to drive a traffic light.

I really enjoyed the detailed explanation of your trial-and-error methodology. Would love to see a follow up design with proper buffering and in-depth filter calculations. 😊 Very inspiring, excellent video!

@GadgetReboot

2 жыл бұрын

Yes I'd like to make a re-design for sure, especially so the filter math will work better when the op amp vs transistor won't load the filter down. But I liked working on this one for fun and there's still always lots to learn with stepping stones.

@darkphotons101

2 жыл бұрын

@@GadgetReboot You’re absolutely right! Nothing wrong with this design, it’s great for learning and experimenting purposes. Heck... my first Light Organ consisted of three coloured 220V Lamps with a TL Starter in series I ‘borrowed’ from the class ceiling lights lol Didn’t really react to sound but it did blink for sure. Also, back in the eighties most schools weren’t equipped with fire detectors lol (disclaimer, DON’T DO THIS AT HOME, I was a kid at the time lol)

Great video, filters are interesting things....cheers.

Thank you

👍

Well you can't beat a good flasher! (Led that is) :-)

Cool! Is this similar to how a frequency analyzer works?

@GadgetReboot

2 жыл бұрын

Maybe in a very general sense, in that there's some sort of way (or filter in this case, maybe math like Fourier transforms in a test instrument) to separate out parts of the frequency spectrum to pinpoint the amount of energy present in the signal for that freq. range. And then do something with the information - report the level, or turn on a blinky light (more fun)

Nice video- Based on this, I built one using an ULN2003, since I have a bunch... How much power are you looking at for the LED? This IC can do up to 1.5a I think, with each pin able to do 500ma. I used a bias voltage of 1v to start, with a 5k pot on the 1k/8k2 voltage divider to adjust the sensitivity.

@GadgetReboot

2 жыл бұрын

The ULN2003 would easily handle anything I had in mind, even if I have to use it just to drive an even bigger switch for special cases. The simple transistor method I used doesn't get anywhere near the turn on capabilities so even if I just used the same general purpose NPN but did it better, it would probably be fine for me. I think my filter series 10K severely limits base current so the LEDs barely glow, but it was still fun!