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Make your first Serious Amplifier
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I checked chip-amps right after sound went off and they were just warm(after ~5min). If it's not heating then may be it's something with the power? I measured voltage between V–/V+ and Ground and it was rising with V+ and going down with V–, then reaching 8.9V when sound went off. It was a damaged trail on power pcb, resulting in 550Ohm resistance which didn't let caps recharge simultaneously. Hope this will help someone.Sorry for bothering, man
DIY Electro-Magnetic Levitation!
Thanks so much for this post and for hitting the Made It button! Great to hear that the I'ble was useful for you!Y.
It might be overheating. The chip-amps turn off when overheated. Your heatsink seems large enough though. Is it hot just after the sound turns off? Is your case perforated, so that hot air around the heatsink can flow out?
Wonderful! Great build, thanks for the post. Posts like these always make my day :)Y.
I've got a little problem here(Sometimes sound just goes off. Switching on and off helps but then it repeats. What could be the cause? Overheating?
Great instructable! When I found this instructable, I didn't even think I could build an amp, but here it is! Well, my wiring not that neat, but I hope it saved some space and it works. God, how many times circuits stopped working and I thought I've messed with the chip, but it was just disconnected ground or bad soldering.There's a couple of things that I added: I added a 100 Ohm resistor between V+ and V– terminals, that switches on when power is off to empty those giant caps (without that a led, which is also between V+ and V– parallel to amp circuits, would stay on like forever). Use at least 1watt resistor for this. Also I've made amp pcbs one under another to save space.There's one little thing I had to figure out myself: to turn linear potentiometer to logarithmic, you need to insert certain additional resistance between input and output, for 50kOhm potentiometer it's 10kOhm.
Thanks so much for this instructable! Thanks for documenting it, it sounds great! At the end I decided to make the power source as 2 dc sources connected in series as in http://www.markhennessy.co.uk/articles/power_suppl... the rest is exactly the same :)I also made use of a kind of pcb for the components, reinforcing some of the connections just in case there would be too much intensity. Sound is very nice and can power up my speakers with no problem at all. For the heatsink I used a piece of metal and attached on top a couple of spare small heatsinks that I had around. I just need to change the potentiometer, it turned out to be noisy for a particular angle. I add couple of pictures. Thanks a lot once again!
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You can make one for yourself with this Instructable ;)
Pretty rings, great I'ble. As ever...
3D printed Push Puppet named Eeps
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