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Subject: Re: PCB problems please help

Date: 11/29/01 at 6:49 AM
Posted by: Darren
E-mail: darren@guartel.com
Message Posted:

In Reply to: Re: PCB problems please help posted by David Ashby on 11/28/01 at 12:51 PM:

Hi David
The need for a very high impedance meter is becoming obvious. The circuit will detect any probing and the measured values will reflect this. The op-amp detects very small reductions in the ac amplitude, and will signal this change.
Does anyone have a massive impedance cct that can be used as an input buffer to a meter or oscilloscope?
With regards to component changes, I have actually desoldered the comps from an old working board and soldered them onto the new board, with no obvious differences.
Maybe a change in opamp would solve the problem, at least it might eliminate a possible cause.
Many thanks to you David, I now have a course of action, whereas before I was at a loss.
One other thing, the board needs some alterations anyway, and so I have a chance to alter the layout. Any recomendations would be most helpful.

Rgds Darren

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