I have a Marantz SR-5100 receiver with a fried power amp section. I wired up the preamp to a pair of RCA jacks and am using it just a a tuner/preamp. When turning on the receiver and power amp on or off at the same time using a power strip switch I get a loud thump/pop. I recall something about using a small cap on the preamps output to help absorb this. Anyone know how to do this, or any other cure?
Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
You might consider a delayed relay. Use a DPST relay and a 555 timer and transistor to drive it. It's a simple solution. Not as simple as a single cap or something like that, but it really isn't much effort. You can easily put it on a small perfboard and get power from the amp's internal power supply. If need be, add a 7812 regulator to bring the supply voltage down for your timer circuit.
Using a small cap will lower the amplitude, but the bass response will also suffer. Wayne has a nice idea but if the circuit is too complex or no tools, one could use a more time consuming method of turn on the preamp first, then after some period of time, turn on the amp. When turning off, reverse this order.
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