GeigerCounterEnthusiasts at Yahoo! Groups

Re: Broken W. B. Johnson GSM-115

radchemstud — Tue, 18 Jun 2013 04:34:41 GMT

Thank you Geo for looking into this. I have disconnected the cable at the PCB but the meter behaves the same as before. I am still trying to get a hold of the

Re: Altimeter dial still "hot" but hardly luminous

M K — Tue, 18 Jun 2013 04:17:37 GMT

Basically, under the constant bombardment, the phosphor eventually degrades. Often it will not visibly glow at all. To get an idea what it might have looked

Re: Altimeter dial still "hot" but hardly luminous

David Griffith — Tue, 18 Jun 2013 03:35:31 GMT

... [snip] ... The radiation from the radium causes the fluorescent material to break down such that it's no longer fluorescent. -- David Griffith

Re: Adding an internal speaker/sounder

Mr peter shintani — Tue, 18 Jun 2013 03:19:58 GMT

Don't know how well a piezo can shake the metal case ? However, if you look hard there are small ~1" speaker with plastic cones, it should be water

Altimeter dial still "hot" but hardly luminous

Charles — Tue, 18 Jun 2013 03:15:01 GMT

While traveling recently I picked up an old (WWII aircraft?) altimeter at a flea market. It only has one "hand" and does not appear to have been opened or

Re: Adding an internal speaker/sounder

Robert Druecker — Tue, 18 Jun 2013 02:19:46 GMT

if a piezo unit works, you can glue it or velcro it. i've got one 700 with a hole in the side, piezo glued on the inside of the case against the hole. it of

Adding an internal speaker/sounder

Pavel Kirkovsky — Tue, 18 Jun 2013 02:03:23 GMT

What is the best way to add an internal speaker to a standard metal-body Geiger counter? I have an Eberline E-120 that has the usual screw-type headphone

Re: Juan Jimenez

Mr Men — Mon, 17 Jun 2013 23:47:41 GMT

Don't think I'll install russian alleged security patch on Android

Drivers for Ortec HPGe

Andy Kirby — Mon, 17 Jun 2013 12:50:25 GMT

Guys I wrote a little while ago about some folk I know getting an Ortec HPGe unit. The feedback and advice at the time was excellent. They have about got it

Re: dry ice

Andy Kirby — Mon, 17 Jun 2013 11:49:39 GMT

There was one being setup for a demo Friday afternoon I got to have a look at. It was like a square terrapin tank with a lid and a black base marked off in

Re: dry ice

jp2cbyou — Mon, 17 Jun 2013 08:23:49 GMT

You can see Gamma radiation using a cloud chamber? I don't believe I've ever observed that. But hey most don't believe that X rays are visible to the naked

Re: dry ice

robert8rpi — Mon, 17 Jun 2013 06:33:22 GMT

This works much better if you put a sock over the end of the discharge cone. Cheaper to just buy dry ice pellets. Can be picked up from grocery stores in many

Re: dry ice

GEOelectronics@... — Mon, 17 Jun 2013 05:48:30 GMT

Are those mechanical refrig. or Peltier? Now try moving the charged particles with a magnet? Thanks Geo ... From: "P." To:

Re: dry ice

P. — Mon, 17 Jun 2013 04:48:03 GMT

I cascaded two refrigeration units to drop the temperature of an aluminum plate to -40C and it was surrounded by a sponge saturated with alcohol. I had an

Re: High efficiency (0.01 mA idle) simple GC HV power supply

Andy Kirby — Sun, 16 Jun 2013 20:56:14 GMT

Interesting I usually prefer flyback switchers using transformers (It is an isolation thing) but these last few inductor based boost circuits have been useful.

GeigerCounterEnthusiasts at Yahoo! Groups

Re: Broken W. B. Johnson GSM-115

Re: Altimeter dial still "hot" but hardly luminous

Re: Altimeter dial still "hot" but hardly luminous

Re: Adding an *internal* speaker/sounder

Altimeter dial still "hot" but hardly luminous

Re: Adding an *internal* speaker/sounder

Adding an *internal* speaker/sounder

Re: Juan Jimenez

Drivers for Ortec HPGe

Re: dry ice

Re: dry ice

Re: dry ice

Re: dry ice

Re: dry ice

Re: High efficiency (0.01 mA idle) simple GC HV power supply

Re: Adding an internal speaker/sounder

Re: Adding an internal speaker/sounder

Adding an internal speaker/sounder