Not Quite As Simple CSA

This area is for discussions involving any fusion related radiation metrology issues. Neutrons are the key signature of fusion, but other radiations are of interest to the amateur fusioneer as well.
Joe Gayo
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Re: Not Quite As Simple CSA

Post by Joe Gayo » Mon Oct 19, 2020 5:24 am

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.
2Layer.PDF
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Joe Gayo
Posts: 212
Joined: Mon Jan 07, 2019 2:34 am
Real name: Joe Gayo
Location: Los Angeles, CA

Re: Not Quite As Simple CSA

Post by Joe Gayo » Tue Oct 20, 2020 12:52 am

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

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Richard Hull
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Re: Not Quite As Simple CSA

Post by Richard Hull » Tue Oct 20, 2020 6:19 am

Joe, I PM'd you with my order.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Joe Gayo
Posts: 212
Joined: Mon Jan 07, 2019 2:34 am
Real name: Joe Gayo
Location: Los Angeles, CA

Re: Not Quite As Simple CSA

Post by Joe Gayo » Tue Oct 20, 2020 6:44 pm

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

Joe Gayo
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Joined: Mon Jan 07, 2019 2:34 am
Real name: Joe Gayo
Location: Los Angeles, CA

Re: Not Quite As Simple CSA

Post by Joe Gayo » Tue Nov 03, 2020 9:32 pm

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.

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Richard Hull
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Re: Not Quite As Simple CSA

Post by Richard Hull » Wed Nov 04, 2020 5:07 am

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
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Joe Gayo
Posts: 212
Joined: Mon Jan 07, 2019 2:34 am
Real name: Joe Gayo
Location: Los Angeles, CA

Re: Not Quite As Simple CSA

Post by Joe Gayo » Wed Nov 04, 2020 9:23 pm

Captured live neutrons with the fully completed board and a BF3 tube ... now I need to start producing the boards that people ordered.

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