Bipolar PI work in progress

[6666]

Good work Mick.

[mickstv]

Decided it was better to start a new thread for the Bipolar Pulse PI I'm building. If anyone has any comments and ideas, they will be appreciated.

The diagrams should be correct, this is the first time I've used any software to generate them.

I haven't built the output section yet, the project is a work in progress ok.

With the testing I've done so far the circuit perfectly cancels out EF on both the Target sample circuit and GB sample circuit. So now all I have to work on is the Target/GB cancelling circuit. If anyone has any ideas they want to put forward on ways to achieve this comments will be appreciated.


With the circuits shown below and just monitoring the Sample channel output directly using a CRO I can see the results listed below. The CRO was set to 0.2v per div, any lower and the interference from everything running in the house makes the output too unstable on the CRO screen, this is to be expected though.

Australian One Penny at 45cm
Australian two dollar coin at 38cm
One gram lead weight at 22cm
Ten gram lead weight at 29cm