Re: Broken Condenser Microphone MXL CR89

Thank you!
[url]http://cdn.recordinghacks.com/images//mic_extras/mxl/V89_circuit.jpg[/url]
In this photo one of the blue-green resistors has a black ring as well. It means that it is not the burning mark. I thought they should look the same.
Yes, the two huge electrolytes are Nichicon KZ Muse 100uF 50V.
On the other side, two Nichicon KW(M) 10uF 50V around J-FET 2SK170-GR.
And on the exit Nichicon PW(M) 150uF 50V.
Maybe I will start with replacing capacitors.
Thank you for naming IC's !!!Re: Broken...

Hi! I've got a broken mic. Do not know its history.
After connecting to phantom power and preamp it works for 30-60 seconds and then the autoexcitation starts. It begins to buzz lightly and then I can hear strong buzz only.
I could not find schematics for MXL 890, V89 or CR89 which supposed to be the same.
The circuit board looks fine except one 47 Ohm resistor, which looks burned.
Should I change this resistor only, or capacitors and op-amps could be damaged as well? Unfortunately, all op-amps names were scratched away by the manufacturer.
Thanks!...

Re: New Members - please post your introductions here

Hi! I'm an engineer, but working mostly with music and video now.