gEDA-user: Re: Looking for a project

Mon Apr 2 10:08:38 EDT 2007

On Sun, 01 Apr 2007 13:32:44 +0100, Peter Clifton wrote:

> On Sat, 2007-03-31 at 22:37 -0400, DJ Delorie wrote:
>> So, would an isolated probe need an isolated power supply also?  Those
>> could get expensive.  Isolated power supply, opto-isolated digital gain
>> control, opto-isolated return data stream, etc.
> 
> Yes, but they can be done very simply, or picked up as ready built and
> encapsulated modules.
> 
> All it needs is a small ferrite transformer

Or even simpler, supply the instrumentation amp with 9V power packs. Even 
a cheap, wall bug with rectified regulated voltage will do, if all 
voltages are low enough. This is how I did it, when I needed a 
differential probe without the notorious groundloop. 

---<(kaimartin)>---
-- 
Kai-Martin Knaak
http://lilalaser.de/blog