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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Here is an ingenious and elegant Russian GM circuit.
Two different GM tubes are used, the small Si3BG to cater for hard gammas, and the larger STS-5 to deal with the softer end of the spectrum. This configuration compensates for the very non-linear energy response of GM tubes, which causes severe 'over-counting' below about 120 keV unless measures are taken to compensate for it.
Rather than using amplifiers - which would have needed a filament/heater supply for valves in circuits of this era, two miniature cold cathode thyratrons are used. The GM tubes provide the trigger pulses for the thyratrons, which then conduct and apply power to the loudspeaker.
This is a very sophisticated design for battery portable equipment of that era, since the battery supplies very little power until a GM event is detected, while a thermionic valve amplifier would have needed the batteries to supply power for filaments all the time that the circuit was on.
The are small but exciting flashes of light when the thyratrons conduct!
This was simple soldier's equipment of its time. If there were only odd sporadic clicks everything was OK. If the clicks came so often that it sounded like a hail storm hitting a window, it meant you should clear off and do whatever you could to protect yourself.
A silicon person could easily create an SCR version of the circuit.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
This was the effect where some 3 pin IR modules seem to be sensitive to radiation in the form of pops or clicks when the digital signal output is connected to a speaker.
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Inventive Russian dual GM tube circuit
