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Damn, I didn't have any pots at hand, I'll have to pick up some tomorrow. Maybe I'll try it anyway with something that should give line level output.
What would the best way to have audio source in these kind of circuits anyway? For example coming from a mp3 player? Strip off other end of male-male 3.5 mm plug, put the other end in mp3 player, then put either channel from the stripped end to audio input?
It doesn't work, at least with mp3 player and without the pot. I presumed it should've worked at least somehow even without the pot, but no.
I think I have a problem with the audio input, it's at the moment just 3.5 mm earplugs, from which I have stripped of the earbuds, and just plugged left one to the breadboard. What kind of audio input I should have for these kind of circuits?
Did it work with the 1meg from pin 3 to pin 5.?... did any LED light.?
I wouldnt worry about the MP3 or earbuds until the LM3915 works on the static test with the 1meg test resistor...
Ok, here's the present configuration and photo of the real board too.
I used a 1M resistor and put it between pins 3 and 5, but nothing happened. I tried both with audio signal and without any audio signal in.
Yep, leds work alright individually in that kind of circuit.
Ok, I put a jumper wire between #5 and #7, but nothing happened. I also tried this with another LM3915 (I replaced just this on the circuit) but nothing happened here either. I'll get my voltmeter back tomorrow, I sure could use it right now...
I got a loaner multimeter and I tried it to my circuit. I'm not quite sure how to measure with it, but here's what I did:
Red (+) pin from the multimeter to the pin in the chip
Black (-) pin from the multimeter to the circuit ground
12v works, I get about 12.3V through, and all the pins give 9.6V measurement. I think I'm doing something wrong.
I thank you for the patience to answer these...![]()
This is so weird. When I test the chip pins with the multimeter, LED number 9 lights up very faintly. Except when testing pin #1...?