sc_pic, new PIC project with high voltage ;-)

Jan Panteltje · 2010-12-04T14:24:04+00:00

So, designing a scintillation counter,this will involve extensive PC side Linux software too,but first I needed to build some hardware to generate HV, detect PMT pulses,and talk to the PC.As to somebody moaning about full desks here, well it IS full, and the photoseriesas requested, clearly show that. ftp://I needed up to 1750 V DC for the PMT I use, a Photonis XP2423.And I wanted to do as much as possible in as little space as possible,as I only had this small piece of veroboard or whatever it is called left. ftp://Some part of the diagram is hidden by a MARS plastic eraser, this is deliberate,I may file for patent on this totally out of the worldpulse processing part... IF it works..A while ago I had somebody mention the resonance of TV HV coils as being tunedto the fifth? harmonic, while I thought it was the third.This little transformer I took from a HeNe laser supply, as the HeNe laser tubebroke years ago,seems tuned to the second harmonic.This thing can really do 10 kV, so I use a hysteretic control loop with oneof the PIC internal comparators to stabilise that a bit lower,The plastic box will be lined with black lightproof material (plastic garbageback 4 layers seems good),the lid is very good black plastic, and the PMT and polyethylene scintillatorwill goin an other layer of garbage bag plastic in the same box.The PMT should then hopefully see flashes of light in the polywhatever,.The wiring side of this PCB is art in itself, only 2 wires for the RS232, andone where there should be a diode againstreverse polarity, when I dig one up.So much for Saturday afternoon. Panteltje AtomicsMore Bang For The Buck

Dec 04, 2010 42 Replies

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Archimedes' Lever 15 years ago

series

multivibrator.

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Jan Panteltje 15 years ago

PC side working via RS232 with sc_pic: ftp://panteltje.com/pub/sc_pic/xscpc.gif

Just a few minutes to write the GUI part and graphics update (its alive and autoscaling) in Linux using the xforms library:

formatting link

One day a web page perhaps, for now the project is here: ftp://panteltje.com/pub/PMT ftp://panteltje.com/pub/sc_pic/xscpc.gif

Need to add some buttons and stuff.. later.

Panteltje Atomics More Bang For The Buck

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Jasen Betts 15 years ago

why not activate the discharge switch immediately after the sample and hold ends?

?? 100% natural

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