DiY Amp clicks

I have built something similar to a Cmoy and i notice that when i plug/unplug the source there is a loud click

It also clicks when i press the play/stop buttons

It looks like the sony x10 mini has ~4mV DC offset

I have an HPF at the beginning of the amp so it is not getting amplified, except for the moment of pluging in

That the source of the first click

The second is somewhat stranger

It looks like the sony is turning off it DAC when it is unused for ~5 seconds

So 5 seconds after pressing stop i get another click - the input dc offset goes from 3-4mV to 0mV.

Whats even stranger is when its powered back on it momentarily jumps to -13mV

Which is amplified x5 (since it is not DC) to ~60mv spike at the output - this is a very loud click on my grado sr80 and can probably damage them.

So, is there any way to avoid these clicks?

I an thinking about putting an LPF at the output. maybe putting a capacitor on the amplifier's resistor. but this might require a large capacitor (>1uF), which I would like to avoid.

Also it is very noisy - but that is the source's fault. When connecting to my PC the music is drowned in the digital noise.

not sure it will help

its not a dc offset - its a click

depends on how fast the switch is

I am actually thinking of a simpler solution

use a 4 pin socket for the input (like phone's headsets)

when an input is connected 2 of the pins should get shorted

so i would use an RC circuit that gives a 1-2 sec delay

charges through those shorted pins (+ resistor),and discharges over time via a resistor

when its charged it should connect the output to the output plug

this will also give the 1-2 seconds delay on power-up if the input is already connected

need to think through the details

buying 100$+ dac and source kinda beats the purpose of a cheap DIY Cmoy

Anyway i have put a potentiometer at the input, set the source to almost max volume and turned the volume  knob down.

Looks like it's fine now

My x6 amp uses 10k and 50k resistors

Putting a 150pF on the 50K resulted in significant noise and 300mV DC offset . strange

Noise/DC appears only when headphones and the input cable are connected (without a source)

So i just got rid of the capacitor. still. I wonder what happened there

50K is instead of R3+R5

the 150pF instead of C2+C4 - caused the noise and DC