... Thanks for that data! It is very helpful when trying to compare my results. I know that most diodes have a steep increase in leakage with temperature, but...
Success! I connected one of my electrometer JFETs as a grounded-source amplifier running at IDSS with a 47k drain resistor and a 22 megohm resistor from gate...
Great!!! About what was the area of the large pin photo-detector diode? I realize the noise you're getting is from the amp, and it can be shielded, but is the...
The detector is a SD200-11-31-241 and it has a 0.2" Dia. active area. I put several layers of tape over the window and placed it between a tin can and lid,...
I don't want to push this, everyone has been so very helpful, but... could you put the schematic out there? or a more exact way to duplicate what you did?...
I'll go one better. Watch http://www.techlib.com/science/detect.htm tonight and this weekend and I'll document in real time my construction of a test bed. I...
Regarding http://www.techlib.com/science/detect.htm Well, I'm done for now but I might try some other semiconductors tomorrow now that I have a decent test...
I tried several semiconductors but none compare to the PIN photodiodes. A 0.1" square photodiode in a thin plastic package responds to the lantern mantle but...
That is a neat little test box...I may have to try something similar. I was thinking along the lines of a 2"x 4" solar cell with electrical tape over it, and...
I'm pretty sure that won't work. With the PIN diodes, the noise due to leakage current goes up with size and will bury the pulses at some point. That was the...
Rather than individual channels could there be a noise reducing configuration of multiple PIN's in parallel, similar to the multiple parallel transistor moving...
I have no idea what a "multiple parallel transistor moving coil pickup preamp circuit" is. But I'm not sure why each PIN in an array would need its own preamp,...
If that would work you could just use a bigger device. I think the problem is that the ray only strikes a tiny portion of the device and the resulting...
Thanks, understood now. charleswenzel <charles@...> wrote: If that would work you could just use a bigger device. I think the problem is that the ray...
If you were to use a LMC6001 instead of a FET for an amplifier in the CDV-715 modification, how would you change the circuit/schematic, I didn't know that op...
Thanks... I thought you might be refering to a voice coil used in older hard disk drives. Joel laurie camion <lauriecam2006@...> wrote: I was referring...
Just leave out the FET and connect pin 2 directly to the chamber wire (without the battery test resistor). You lose the battery test function. The nice thing...
Hi, I built the lightning detector, and it worked great in the storm we just had last night. Now I'd like to try to determine lightning strike direction. Does...
For those interested in this type of detector, I published a detailed design article in the Files section of the GeigerCounterEnthusiasts Yahoo group. You...
I would like to build one of these ion chambers and was wondering what causes the fets to blow - is it a static event - like touching the can/discharge or is...
I destroyed a few FETs by shorting the gate to the positively charged ion chamber can which is pretty easy to do. They are probably a bit sensitive to static...
The ion chambers are compelling so I will probably try more experiments. I like the radon detectors that draw air through two chambers, the first is just to...
Hi, Would anyone out there have Schematics for a Victoreen Panoramic meter. Have a problem with the amp board, not good... (this one uses (4) 22.5vdc batteries...
What are you using to create the schematics on the techlib.com site? ... Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase....
I use Turbocad 7.something. It can be found on eBay for about $5! It's a full-featured CAD program that is really easy to use. I suppose I should upgrade to a...
Oh I have Turbocad, it's version 2.03 and cost me all of $9.95 in 1995 (according to the sticker on the box) LOL. Did you get an electronics part symbol...
You should upgrade! It looks like $10 will buy version 10 or so, so maybe I should upgrade, too. I had a lot of stability trouble with earlier versions of...
