Mute Relais...

[HVfanatic]

I got a OMTEC CP2 rebuilt with major improved power supply. It sounds really beautiful, but there is a big difference to the original:

1. Simple input switching
2. No mute relais

I want to put this prototypes into an approbriate housing.

I want to use an Elma 2 Level / 6 Settings / 4 Pole swich for input selection.

BUT: I need a mute relais circuit.

It has to crowbar the outputs until the servo has settled.

I need:

- Relais to open after 30s
- Relais to close after power switch off. Voltage decreases slowly because of BIG PS. Onboard of the preamp is a further reduction to 20V (input stage), output runs with 24V.

The circuit has to detect the decreasing PS voltage and needs to shut the relais.

The original preamp uses the 24V for the Relais logic.

Any idea??? Ready small PCBs in good or best quality to do the job?

Parts recommendation for the relais???

(Almost ;-)) No problem to etch a board and to understand analog circuits...

Dirk

[HVfanatic]

Noone has a good idea???

Other solution is highly appreciated.

Dirk