A basic Geiger counter circuit

Published:2013/5/9 21:36:00 Author:muriel | Keyword: basic Geiger counter circuit | From:SeekIC

The circuit below is designed to achieve low power consumption - less than 1mA - for extended battery operation, while being relatively stable and easy to build. None of the component values are especially critical, and it is possible to use other transformer designs. For best efficiency, the value of oscillator capacitor C3 should be adjusted to resonate the transformer. If you don't have an oscilloscope available to help you with this, you can get a fairly good result by scaling up C3 roughly in proportion with the primary inductance. You can estimate this from the quoted specific inductance of the core, multiplied by the number of primary turns squared. The transformer is probably the trickiest bit to make, but it's worth doing well. You may struggle to find suitable commercial parts with this turns ratio, although it is just about possible to press a small mains transformer into service by using it in reverse. The efficiency will be fairly low, though.



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