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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. ….(schematic added 04/05/06) |
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CDV700 Geiger Counter Probe Rebuilding - (electronic design added 6/07) |
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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...(electronic design added
06/09) |
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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...(added
04/05/06) |
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Geiger Counter imagesco - (electronic circuit added 4/05) |
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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.....(electronic circuit added 7/03) |
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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....(electronic design added 6/07) |
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Miscellaneous simple circuits - (diagram added 1/07) |
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Modifications for CDV700 Geiger Counter - (diagram added 3/07) |
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World' Smallest Geiger Counter (Area 50) - (schematic / circuit added 4/08) |
