Delaying Relay Circuit to Block Thump or POP Noise of Amplifier

“Thump” or pop noise is an annoyance when you turn your audio amplifier on/off, you can’t do much to stop the pop sound like adding more filter caps..etc. it didn’t help me.

The easy way to block the noise is by attaching a delaying speaker relay to the output of your amplifier

Here is a circuit that i designed for my 5.1 amplifier, because i was having trouble of a very loud “DUPP” sound through my subwoofer everytime when i turn the amp on.

The posted circuit is almost simple, and will give you 5 seconds of delay to turn on the output of your amplifier.

Note: C1 and R1 decide the time to turn the relay on, i used 47uf for C1 And 100k for R1 to get 5 Seconds, you can change the value of C1 for different timings and the output (to speaker) of your amplifier must be connected to relay and relay’s output should connect to speaker