[sdiy] Power supply spike

[Ingo Debus]

Am 24.02.2007 um 08:10 schrieb Louis van Dompselaar:

> Sorry, I think I didn't explain myself clearly.  The spike is  
> coming through the mains power supply into my active monitors.  It  
> is produced
> even when the modular is connected to nothing else...  it is NOT  
> coming
> through the audio path.

Connect a 100nF cap and 100 ohms resistor in series and hook this  
combo in parallel to the mains switch. If there's a dual pole mains  
switch you need two of these combos. Of course the voltage/power  
ratings of the cap and resistor must be appropriate. Use a "X"-cap,  
after all there's mains voltage across it when the device is powered  
off. These resistor/cap combos are also readily available in one  
case, they are called spark-supressors or something like that.
I remeber this worked wonders on the slow/fast switch of by DIY  
rotary cabinet many years ago.

Ingo