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Geiger Counter Monitors
Last Updated on: Saturday, August 22, 2015 04:13 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Build Your Own Geiger Counter -  The 4049 Hex Inverting Buffer is set up as a square wave generator. The power MOSFET IRF830 switches the current on and off to the primary windings of the mini step-up transformer. . . .  [Copyright 2007-2014 Images SI, Inc]

CDV700 Geiger Counter Probe Rebuilding -  This article describes the process of rebuilding a geiger counter probe from the Victoreen CDV700 geiger counter. The process of converting the hard-wired probe to a probe with a pluggable BNC connector is also described. The probe from the model CDV700-6B is similar, but not identical, the socket is easier to access on that model. . . .  [Circuit Design by Forrest Cook]

Count Accumulator for Radiation Levels (CARL) -  The CARL device is an add-on numerical counter that plugs into the headphone jack of 1960s vintage geiger counters such as the Victoreen CDV700 and CDV700-6B. It should also work with the Lionel ENI/LENi counters, and any other geiger counter that has a headphone output pulse greater than -5V. Vintage 1960s era geiger counters don't actually count, they use an analog meter with an integrator circuit to give short-term averaged. . . 

Darling SE Tube Amplifier -  Scroll down to find this circuits. In the diagram I've put the transistor numbers as the ones I've used, although you can use standard 2n3904's etc in these positions without problems as they're similar spec. The transformer used is a normal audio output transformer, such as an LT700. . .  [Charles Wenzel (unless otherwise noted)]

Geiger Counter -  The above circuit was used to construct a home-made Geiger counter employing a 10 inch Geiger tube (LND 78014). The pulses from the tube were converted into 3 volt, fixed-width ( a few hundred microseconds) pulses suitable for averaging using the following circuit (updated 5/5/04). . .  [Charles Wenzel, designer]

Geiger Counter -  Some people might like this. . . .  [G.L. Chemelec, designer]

Geiger counter -  Schematic only, no circuit description. . .  [Designer's name not given]

Geiger counter -  Geiger counters are available in all shapes and sizes, but they tend to be quite expensive to buy (typically a couple of hundred US dollars for a simple model, rising to a thousand dollars or more for a professional instrument). For a first-timer, and/or a reasonably experienced electronics hobbyist, building your own can be a very rewarding alternative. . .  

Geiger Counter -  For the short amount of time the GM tube is detecting one particle, if another radioactive particle enters the tube it will not be detected. This is called dead time. The maximum dead time for our GM tube is 90 microseconds (or . 00009 seconds). There is a mathematical formula for adjusting a Geiger counter read out to compensate for the GM tube's dead time. However the adjust is so small that for practical applications it can be ignored. High-end nuclear work will take a tube's dead time into consideration. . . .  [Copyright 2007-2014 Images SI, Inc]

Geiger Tube Simulator -  This little gadget will simulate a 500 volt or less Geiger tube when driven by a signal generator of sufficient amplitude, typically 5 volts p-p or greater. The purpose is to generate a steady, precise number of counts per minute so that the Geiger counter's meter may be calibrated. . . .  [Copyright 1998 Wenzel Associates, Inc.]

High Voltage Generator for Geiger Tubes -  The following two circuits are an improvement over the older circuits below. The circuits are shown generating 500 volts but they may be modified to supply a couple of hundred to nearly 1000 volts by changing the zener diodes. The difference is subtle; the feedback signal increases the voltage on the base of the 2N4403 to stop the oscillator instead of stealing current from the capacitor on the emitter. The result is much lower power dissipation when there is little or no load on the high voltage. . .  [Charles Wenzel, designer]

High Voltage Generator for Geiger Tubes -  The difference is subtle; the feedback signal increases the voltage on the base of the 2N4403 to stop the oscillator instead of stealing current from the capacitor on the emitter. The result is much lower power dissipation when there is little or no load on the high voltage. The new circuit draws less than 1/2 mA when operating at 9 volts without a load using a 1:1 600 ohm audio isolation transformer. The 3 volt circuit may be modified in the same way but make sure to switch to a MPSA18 (or a similar very high gain transistor). The 120 volt zeners are also an improvement over trying to grade ordinary diodes; grading is just too much trouble!. . .  [Charles Wenzel, designer]

Hot Rodding a CDV700 Geiger Counter -  This project involves making several modification to an early 1960s era Victoreen CDV700 or CDV600-6B geiger counter. These counters are available on E-Bay for around $50 to $100. The modifications use modern electronic parts to improve the counter's stability, extend the run time, and add a solar recharging capability. . .  

Modifications for CDV700 Geiger Counter -  This project involves making several modification to an early 1960s era Victoreen CDV700 or CDV600-6B geiger counter. These counters are available on E-Bay for around $50 to $100. The modifications use modern electronic parts to improve the counter's stability, extend the run time, and add a solar recharging capability. . . .  [by Forrest Cook]

Readers' Versions -  Techlib reader Dave Mouat modified the circuit . . .  [Charles Wenzel, designer]

World's Smallest Geiger Counter -  Scroll to find this one. It probably isn't the smallest and it isn't really a Geiger counter (no Geiger tube and it doesn't count) but this really small radiation detector flashes the LED every time a particle of sufficient energy strikes the tiny PIN photodiode. The small detector gives about 1 pulse per second with a 2 mR source (using an old fallout shelter Geiger counter and test source as the reference). This sensitivity is enough to determine if a lantern mantle is radioactive or a mineral sample is uranium. Most importantly, its small size makes it inconspicuous! A typical thorium lantern mantle gives about one flash every two seconds. Thoriated welding rods give a blink about every 10 seconds and weak Vaseline glass marble gives only one count every 45 seconds so the detector becomes impractical for the weaker sources. A larger PIN diode is the simplest way to improve the sensitivity. . . .  [Charles Wenzel, designer]

Geiger Counter Circuits


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