Pbassred said:I get the idea that a cap will block DC while the relay is open. but if the relay is closed, how does it do anything about passing rail voltages to the driver?
forr said:An efficient spark surpressor. I saw such an RC circuit in a B&O amp schematics once and duplicated it on every of my loudspeaker relay protection circuits.
Pbassred said:The R and C ARE in series. Its a 25 year old 500/ch amp and the company went bust 5 years ago. It looks like a previous owner burned out one of the resistors But replaced it and a cap (correct to the schematics).