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Re: Not Quite As Simple CSA

Posted: Mon Oct 19, 2020 5:24 am
by Joe Gayo
Cascode JFET input
Moved the feedback cap after the input cap
2nd Order RC Bias Filter
Photodiode Pulser w/ adjustable current source (driven by an external microcontroller or signal generator)
9V Battery Holder

I recommend 1p and 47 Meg feedback.
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Re: Not Quite As Simple CSA

Posted: Tue Oct 20, 2020 12:52 am
by Joe Gayo
I'll sell the bare boards for $10 each and tested assemblies for $50 (without pulser) and $75 (with pulser).

Bare boards without the pulser circuit are $5 each

Re: Not Quite As Simple CSA

Posted: Tue Oct 20, 2020 6:19 am
by Richard Hull
Joe, I PM'd you with my order.

Richard Hull

Re: Not Quite As Simple CSA

Posted: Tue Oct 20, 2020 6:44 pm
by Joe Gayo
Thanks.

I just acquired qty. 300 of original PN4416A parts. I'll be measuring and matching for the cascode stage.

Here is the final board -
CSA-02.jpg

Re: Not Quite As Simple CSA

Posted: Tue Nov 03, 2020 9:32 pm
by Joe Gayo
Built the amplifier and pulse section today. Everything tested great!

The pulser can generate 0.1 to 2pc pulses and the amplifier portion is approximately 300 mV/pc. I also feed the pulser randomized triggers (Another board I designed and built) at an average 76kHz and saw no roll-off in amplifier performance.
PXL_20201103_211151521.jpg
I've also decided to offer the board and parts as a kit that you assemble yourself.

Re: Not Quite As Simple CSA

Posted: Wed Nov 04, 2020 5:07 am
by Richard Hull
Great work and effort Joe. I can't wait to get the word on getting those boards I ordered. I have a project scheduled to use them.

Richard Hull

Re: Not Quite As Simple CSA

Posted: Wed Nov 04, 2020 9:23 pm
by Joe Gayo
Captured live neutrons with the fully completed board and a BF3 tube ... now I need to start producing the boards that people ordered.