|
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...(circuit added 05/06/07) |
|
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) |
|
Geiger Counter imagesco - (electronic circuit added 4/05) |
|
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) |
|
High-Value Resistor from Neon Lamp - (added 04/05/06) |
|
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) |
|
Ion Chamber Bias Supply (Battery Topper) - After discovering that one of
my bias batteries was jumping around a few volts, wreaking havoc with the
readings, I decided to build a floating, regulated high voltage supply. The
result is a micro-power 110 volt supply that runs on an ordinary 6V..(added
08/08/08) |
|
Ion Detector (trinity) - (circuit / schematic added 2/03) |
|
Modifications for CDV700 Geiger Counter - (diagram added 05/06/07) |
|
Neon Bulb Quench Experiment - (added 08/08/08) |
|
Neon Lamp as Resistor - It seems to be common knowledge that a NE-2 or
similar neon lamp can be pressed into service as radiation (x-ray) detector.
But can a simple lamp serve as a low-level detector, possibly replacing a
Geiger tube? Initial ...(added 08/08/08) |
|
Nuclear War Detector - The circuit is similar to the earlier darlington
circuits except that the output transistor is a mosfet transistor like the
BS170 or 2N7000 and the load is an LED with a built-in flasher circuit. The
circuit as shown will draw ….(added 08/08/08) |
|
Polonium Pen - Recent events point to the need for a simple device for
testing cocktails and beers for excessive quantities of polonium. The
Polonium Pen is a pocket-sized ion chamber with LED readout that is perfect
for the job. Simply hold the Polonium Pen over your drink and, if the LED
lights up, order something else....(added 08/08/08) |
|
Radiation Design Considerations using CMOS Logic - National
Semiconductor Application Note (app note added 6/06) |
|
Radiation Design Test Data for Advanced CMOS Product - National
Semiconductor Application Note (app note added 6/06) |
|
Radiation Hardened Performance of Discrete Semis - MicoNote 50 from
Microsemi (app note added 6/06) |
