Ramped phantom power project

[SonsOfThunder]

Sometimes I need to use the words "instead of"...

Makes sense now! Maybe we all learned something!

Peace!

 

[gswan]

[quote author="barthman.de"]I'm building a housing solution for 4 Telefunken V672 Mic/Line preamps. In addition to the preamps the housing includes a Telefunken N624 (24 V / 2 A) PSU.

3. On some preamp designs there is a resistor (450 - 500 ohm) before the standard 6k8 resistors (see below). Which function has this resistor?

Thanks for your reply.[/quote]

This 500 ohm resistor is used to prevent a 'pop' when you turn the phantom power on.

 

[barthman.de]

Thank you for helping me. Here the last version of the circuit:

It works fine.

See the article (in German only - sorry) and pictures on my homepage too:

http://www.barthman.de/html/diy/rampedphantom/rampedphantom.html