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?
The coolest thing about this chip is that it will work with nearly anything. It's adjustable. I used one for a 100 watt church PA. It will work just as well with a 3 volt MP3 player.
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?
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?
Unplug one of the LED's, use a 1K from the +12V rail and connect one wire of the LED in the end of the 1K and the other led wire to 0V. [ try the led both ways around if it dosnt light]
Are they blue LED's? The circuit looks fine for driving'em.
How you are connecting the mp3 player 3.5mm jack? Check this image. According to that you've to find the proper pins at the backside of the connector plug. **broken link removed**
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...
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...