Re: HV differantal probe?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

We tried to get some easy Differential probe going about a year 
ago.  However, it proved to be a daunting task and we never could get 
anything to work well.

You can see the old files here starting with "DiffProbe"

http://hot-streamer.com/temp/

The first TL082 based one should work, but the bandwidth would not be very 
high.  The high bandwidth stuff was just about impossible to do in any 
reproducible way.  To much high voltage and too sensitive input 
impedances.  Trying to measure 20 volts riding on nasty 400 volt signals is 
pretty hard.  Then there is ringing and all that...  I did get "one" to 
work but it took hours of soldering surface mount parts to "tune" it.

Cheers,

        Terry

At 02:20 PM 12/31/2004, you wrote:
> Hi, I seem to recall something about a high voltage diffrental probe 
> someone on the list was making a long time ago, anyone still have the 
> schmatic? Im intrested in doing some SMPS work, and hence though it would 
> be a good idea to have a well designed diffrental hv probe for the primary 
> work so I don't fry my new scope, since tesla coils and smps operate 
> around the same freqency range, and something that can surive being around 
> a tesla coil can handle my smps :)