I'm not sure where this belongs, but I had someone ask about this type of circuit for a tube line amp that peaked higher than solid state voltages on start up.
This circuit is as simple as I could make it. 12VDC to run it. Land R are shorted to 12VDC- (usually tied to ground in my builds). After about 11 seconds, the relay opens and sound plays.
It uses two resistors, a cap, and a 9014 transistor as an emitter follower. That drives a relay with a flyback diode across it.
Here's a pic. I have 4 boards left from the prototype run, and I can populate them if anyone wants...
This circuit is as simple as I could make it. 12VDC to run it. Land R are shorted to 12VDC- (usually tied to ground in my builds). After about 11 seconds, the relay opens and sound plays.
It uses two resistors, a cap, and a 9014 transistor as an emitter follower. That drives a relay with a flyback diode across it.
Here's a pic. I have 4 boards left from the prototype run, and I can populate them if anyone wants...
If anyone wants one that doesn't tie power to audio, I can make one but it'll be larger due to the extra connection for ground. Otherwise, you can just cut the trace and solder your ground that way.
