[Amps] Direct rectification of AC mains to drive the amp, VDD, Supply

[Bill Turner]

ORIGINAL MESSAGE:          (may be snipped)

On Thu, 26 Sep 2013 17:36:14 +0000, you wrote:

>
>A good technique is to use a small, but well insulated RF transformer 
>between the scope probe and the circuit. It can be wound on a small 
>ferrite toroid. It needs a series coupling capacitor, and for higher 
>voltages

REPLY:

That's doing it the hard way. Just set the scope input to AC instead of DC.
Problem solved. 

But as you pointed out, do be aware of the voltage rating of the probes, but
that's true in any scope mode, not just the ADD +INVERT mode. 

And always use at least a 10X probe for RF measurements. A 1X probe has too
much capacitance.  

73, Bill W6WRT