Many problems..

[guest]

glad to hear its working

if you want to hunt down the warble
see if you can isolate when it happens

[eisenhower]

glad to hear its working

if you want to hunt down the warble
see if you can isolate when it happens

It happens when the resonance is up high, if that's what your asking.

I tried reflowing the solder again, but it didn't fix it??
I'm perplexed as to why it fixed it temporarily before.

[guest]

ive never completely isolated the cause of the warble
i think someone posted that q22 was the culprit for theirs
there are a few long threads on the topic

[eisenhower]

ive never completely isolated the cause of the warble
i think someone posted that q22 was the culprit for theirs
there are a few long threads on the topic

The voltages on my q22 looked correct. Could the chip still be bad?

[guest]

i rechecked the old thread
viewtopic.php?f=12&t=17605
and it was actually q21

i cant guarantee that its actually the problem
almost every filter warble issue that people have solved
was caused by a different device

is ic23 getting hot at all
what is the voltage drop across r1

[eisenhower]

i rechecked the old thread
http://adafruit.com/forums/viewtopic.php?f=12&t=17605
and it was actually q21

i cant guarantee that its actually the problem
almost every filter warble issue that people have solved
was caused by a different device

is ic23 getting hot at all
what is the voltage drop across r1

that thread says the 2sc2291 caused it, which is q22.

I replaced q21 with a spare I had. It didn't change anything.

ic23 does not get hot.
voltage across r1 is 1.22V

[guest]

well its probably not a powersupply problem then

you can try replacing q22
its about all i can think of at the moment