CGS Serge noise: Difference between revisions

The resistor marked 100k* on the PCB is not needed unless you are experimenting with isolating the S&H from the noise circuit. If a resistor is inserted between the S&HI pads, the resistor in the 100k* forms the lower leg of a voltage divider with it. The pair of resistors can then be used to adjust the range of the voltages being fed into the S&H.

 

| +VE||+VE

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To deal with this, separate the circuits by cutting the short track between the two S&HI pads. The S&HI pads have an X between them on the overlay side to indicate where the cut should be made on the rear of the PCB. Connect the C output to the S&HI pad nearest pin 3 of the CD4007. You can then adjust the center voltage of the incoming waveform by installing the resistor "RPD". In my case, RPD was 1k5, but this will depend on the characteristics of the other parts you have used.

 

== Parts list ==

| CGS97 V1.0 PCB||align=right|1

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== See also ==