Not Quite As Simple CSA

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Joe Gayo
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Re: Not Quite As Simple CSA

Post 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.
2Layer.PDF
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Joe Gayo
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Re: Not Quite As Simple CSA

Post 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
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Richard Hull
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Re: Not Quite As Simple CSA

Post by Richard Hull »

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
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
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Joe Gayo
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Re: Not Quite As Simple CSA

Post 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
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Joe Gayo
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Re: Not Quite As Simple CSA

Post 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.
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Richard Hull
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Re: Not Quite As Simple CSA

Post 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
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
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
User avatar
Joe Gayo
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Re: Not Quite As Simple CSA

Post 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.
JoeBallantyne
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Re: Not Quite As Simple CSA

Post by JoeBallantyne »

The original schematic that was in the very first post of this thread 7133.JFET_CSA.gif appears to be gone.

Does someone have a copy, and can we get it reposted?

Thanks!

Joe.
Jon Rosenstiel
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Re: Not Quite As Simple CSA

Post by Jon Rosenstiel »

JFET_CSA
JFET_CSA
jfet_casc
jfet_casc
Cs1001
Cs1001
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