Recent content by GR/NDER

I spent a bunch of time several years ago building a CMoy amp.  Sadly, somewhere in the process I screwed something up and I could never figure it out, so I never got the thing working...  Well I came across the little amp the other day and I was wondering if anyone would be willing to take a...

Thanks pars. I dont have a voltage tester good enough to put to use yet. If we cant figure anything out I'll go get one. I cleared that section of wire from the (+) side of the battery. It wasnt the problem. I cleaned up some solder on the bottom of the board, and wallah, LED lights...

Quote: Originally Posted by Pars Pics? You Switched the electrolytic cap polarity back to the way they were in your first pics? You left the battery wired per your last pics (red lead (+) going to the left side, black to the right side from switch)? Swapped pins 1 and 4 on the pot...

Quote: Originally Posted by Pars The caps were in correctly in the 1st pics (page 1)... he must have switched them. The battery appears to be wired correctly now ( the + side should be going to the left cap, and the - side to the right cap). Flip the caps back the way they were...

This is where Im at now after following everyones suggestions. Still doesnt work.

Well I'll be damned. Cant figure this out. Who could I send mine to and have it checked out, and get an explanation as to what I did wrong? Is anyone providing that service?

What is my R1 value and how can I check it?

OK! So my amp was definately blown. I went and got a TL082 (Thanks Pars) and installed it. Put my finger over it and turned it on. Got hot super quick and shut it off. Any ideas from my pics where I went wrong???

Okay! the amp was blown for sure. I went and picked up a TL082 and put it in, held my finger on top of the amp to feel if it would get hot. I flipped the switch and sure enough, it got super hot in just a moment. I turned it back off and thats where i am now. Can you guys see anything in my...

thanks guys. i just added solder to everything and my jacks are wired just like you guys said. it still doesnt work. i wonder if my amp is burned out? a puff of smoke did rise up from something when it got real hot on my first test.... huh... any way to test my amp?

Quote: Originally Posted by ls206 Can you post a pic of the underside? Here you go... I cant find any shorts on top or bottom. I even took the xacto knife in between each soldering point.

What about the L & R points on the input jack? Where on the pot do they connect? The OUTPUT? Even though they go from the input jack to the pot? I dont understand it because on the diagram theres a "l.in" and a "r.in" going from the protoboard to the pot as well. thats 4 in's! how the hell do i...

Thanks for the pics. I measured from the ground (downthe center) to chip pin 4 & 8 and got the same reading for both.... Anyone notice anything wrong with my wiring? I got the jacks from Mouser btw.

Quote: Originally Posted by Pars Did you do any testing before you cased it up? Do you have a meter (DMM)? Go thru the tests for voltage (measure from the virtual ground to V+ on the chip pin 8, and V- on the chip pin 4). Everything appears to be in the right places physically...

I followed tangents instruction fine until the wiring. Ive spent the last 6 hours trying to figure it out. Specifically, on the tutorial diagram hes got a "left" and a right" coming out of the IN jack. which would make me think they go to the "In 1" and "In 2". but no! coming off the...