Burnt cap.Why?

[ForthMonkey]

Hi,

I built this circuit,it's my solid state Pultec gain stage Version 2.Power stage is same with V1.But C4 burnt!I can't find anything to fix.Is it bad cap?

V1 working good.I just add another psu and impedance converter circuit.

Can you check please?

Thanks.

 

[RuudNL]

Link gives here: "Error (5xx)
Something went wrong."

 

[ForthMonkey]

Link gives here: "Error (5xx)
Something went wrong."

Added pic.Can you check now?

 

[JohnRoberts]

Look for proper cap polarity (+ to +V) or shorted diode or diodes in B1

JR

 

[RuudNL]

Nothing wrong with the schematic!

 

[ForthMonkey]

Nothing wrong with the schematic!

Yes! I can't find any error,too.

Now i changed cap with the other one.Same value and brand.It didn't burn.Even i waited a long time.And i measured,nothing wrong.

I guess,it was bad cap.

Thanks for your interest and help!

 

[Andy Peters]

I guess,it was bad cap.

Was the cap that burned installed backwards? If so, that explains why it burned.

-a

 

[ForthMonkey]

I guess,it was bad cap.

Was the cap that burned installed backwards? If so, that explains why it burned.

-a

I want to laugh loudly and insult myself.

You're right.There is idiotic mistake.I shouldn't work when i sick.  ???

You can see mistake...

And big thanks!

It's non-working circuit.

And working version.

 

[Andy Peters]

I want to laugh loudly and insult myself.

You're right.There is idiotic mistake.I shouldn't work when i sick.  ???

that is good advice, especially when the medicine has a, ummm, side effect!

Oh, yeah, looks like the PCB was designed for smaller (physically) caps than what you installed. The caps seem to be sitting on the resistor leads.

 

[JohnRoberts]

Look for proper cap polarity (+ to +V) or shorted diode or diodes in B1

JR

yup,,,

JR