freestompboxes.org

Do you have an SSM 2040?

It was bait. I just ordered three CA3080's from UTSource. Took a couple weeks to get to Vancouver BC from Singagpore. They look legit. Haven't tested 'em yet though. Honestly, I wouldn't know how either ... guess I'll find out when I put them in the circuit I've yet to build.

See http://www.futurlec.com/ICLinearAmplifiers.shtml

CRBMoA wrote:I have a D & R Comp fully popped, but I think the only CA3080 I have may be out of commission.

cb

Hi. What makes you think that the 3080 has failed? It's very unusual for an IC to fail unless the power has been reversed or over-voltage applied. Have you checked the DC voltages around the 3080 carefully? Pin 4 should be at 0V, Pin 7 at 9V and 2, 3, and 6 should be roughly at half rail.

Remember - if the 3080 has failed, then it will have been for a good reason. Modern components don't just fail arbitrarily (you're more likely to get a major Lottery win!).

Check your voltages. Don't just start changing components because you "think" that they "may" have failed. Look for dry joints, track cracks, and fractured resistors (especially if it's a home-made board - some people pull the resistor legs too tight and damage the components). If you just change various components, you'll probably add extra faults!

TTYTT, I suspect that I did something reckless to the innocent chip when I was being ham fisted on my first build. I can't remember if I installed it upside down or what. I was even more of a nOOb than I am now. I just remember thinking I probably fried it myself.

I most pleased with your matrix for voltages. I will certainly give that a look this morning. And I have an identical board that is untouched. I may pop it and see if I am a better builder than whoever popped the one I bought half finished.

I have some chips on the way, because I am planning on building a series of simple compressors that I have collected layouts for over the last year.

Thank you for the tips. This is a great place!

If you are in Vancouver, you should check Lee's Electronics on Main St. Their web site is kind of crappy but they seem to have CA3080's for $3.25.
http://www.leeselectronic.com/catalog/a ... 80&x=0&y=0


Andrew

Yay for Vancouver

I went to Lee's a month ago, they didn't have the 3080. My favorite electronics shop!

Shipping is a bit slow, but Small Bear has them for $2.50:
http://www.smallbearelec.com/Detail.bok?no=219