In a high school English class (20+ years ago, can it be that long ago?) we had to demonstrate how to do something. One of my friends decided to demo how to...
In my Freshman High School Year I Talked my way into a Machine Tool Class. I had always been interested in Metal Working as my grandfather had a nice Shop With...
Evening Guys, I've been looking/requesting high and low for a manual for a Bicron G1 1"x1" NaI(Th)Gamma Scintillation Detector. I was thinking that they sent...
Phil I have found that an email yeilds no results with any of these companys. A phone call may be Priceless. My 2 cents worth, Tracy n5tsx <n5tsx@...>...
Yes Tracy,that may very well be true for some companies. I've had excellant results from Eberline, Ludlum, and NDS Products. The major problem with ThermoRMP...
Hello I just got a CDV-700 6B, off of ebay, I installed batteries and turned it out, the meter pings at all levels and I'm hearing a whine fro the components,...
Hello again, I'm doing a School demo in a week or two on radiation and was wondering what the best thing would be to do- I will be doing this in my 9th Grade...
You should hear a low volume buzz from the high voltage supply. It is unclear to me what you are hearing when you say it "pings". Clarify that. Also the...
... Well the meter swings over to full, I took it apart the whining is coming from the small black transmformer, I found this out after taking the geiger...
Joe, My 2 Cents worth. You need to explain the Basics First, Alpha, Beta, and Gamma. Some Material on isotopes will be very helpful. I use the differences...
Ok, could you clarify the "ping" Can you locate the source of it? Its good that you got some action on the meter. If it goes full scale on X100 then there is...
When I said ping, I meant that the meter swung over to full, Yes, I do have a multimeter. I also have schematics but part of them are missing ... scale on X100...
Ok, Good. From here it is a matter of measuring the voltages at the indicated points. I had a similar high pithced whine in mine. It turned out to be a bad...
Okay, I can only locate one diode, let me check it ... the indicated points. I had a similar high pithced whine in mine. It turned out to be a bad diode in...
Okay, what should I get for resistance measurements on the diode, is a germanium or silicon diode? ... black ... Yes, ... are ... of ... full ... hearing...
you should get really high in one direction and low in the other. Do not know what the materials it is made of. What is the manufacturer name of your 700b?...
I tested the diode it worked fine, it's made by victoreen ... Do not know what the materials it is made of. What is the manufacturer name of your 700b? ... is...
That is the model I have. It has a total of three diodes. One is in the high voltage circuit. If you are getting 900v dc that should not be your problem....
Hmm, thanks, can you refer me to this post perhaps? ... in the high voltage circuit. If you are getting 900v dc that should not be your problem. There are...
You can start with post 4387. Also a useful feature is to type the keyword you want to know about and do a search of the archive. Words like diode, buzz,...
Thanks. It appears that I'm not getting any high voltage output from the transformer either=/ ... keyword you want to know about and do a search of the...
Does anyone know what transistor I can use to replace the transistor for the flyback oscillator of my CDV700 6b? I'm hoping I can fix it I purchased it on ebay...
Hi, Almost any PNP transistor will work. Have you pulled the transistor to see if it really is the problem? Another part that fails a lot is the HV diode. If...
Thanks, I'll have to run down to radio shack, I checked for any voltage behind the HV diode and got nothing, I also couldn't pick up any voltage on the...
Oh I was also curious, could that transistor problem have anything to do with the meter going full scale all the time? David tried to help me and he gave me...
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