Mic switch circuit to prevent Smack Crack and Pop on amp output

[SimonW]

Dear All,

Does anyone have any idea or views regarding how to implement a microphone switch (Electret type) circuit to help prevent pops and cracks occuring on amplifier output.

Thanks in advance for your replies

SimonW

 

[ronv]

Usually the problem is a DC shift across a coupling capacitor when the switch is closed. Maybe you can post your schematic so we can see how it is now?

 

[canadaelk]

Try this. E

 

[SimonW]

possible soloution

I have found a webpage with a soloution:

http://www.discovercircuits.com/H-Corner/popfree micophone switch.htm

From what I can understand from your replies and the above link.

The AC mic signal is simply turned off and on, the DC level remain the same, preventing any unwanted noise.

There will be a constant DC supply to the mic, will this not damage the professional £165 microphone?

Thanks

 

[alec_t]

There will be a constant DC supply to the mic, will this not damage the professional £165 microphone?

Not if the correct DC voltage is used. The correct voltage should be available from the mic manufacturer or a datasheet.

 

[mister_e]

Be confident, most Pro Mic have a built-in transformer to prevent this... and some unwanted Phantom Power (48v)