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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 __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Geiger Counter - Some people might like this. __ Designed by G.L. Chemelec
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. __ Designed by © 2007-2014 Images SI, Inc
Geiger Counters - Techlib reader Dave Mouat modified the circuit. These circuits generate high voltages and can cause dangerous shocks! Do not build these devices unless you are experienced and qualified to work on high voltage devices. __ Contact: Charles Wenzel of Wenzel Associates, 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. __ Contact: Charles Wenzel of 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 __ Contact: Charles Wenzel of Wenzel Associates, Inc.
High Voltage Power Supply step-up converter using a MC34063 ideal for a geiger counter or nixie tube - A basic building block for a Geiger Counter (Nixie Tube) __ Designed by Alexander C. Frank, aka Ajarn Changpuak
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. __ Designed by Forrest Cook
World's Smallest Geiger Counter - 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. __ Contact: Charles Wenzel of Wenzel Associates, Inc. |
