Handmade Air Geiger Counter
Circuit
- At voltage stepup of a transformer, the current profit is earned by the Darlington connection using two 2SC1815(s).
- The Cockcroft Walton circuit generates the 10 times as many high voltage as this.
- The bias of 0.4V is applied to the detection pulse by R5 and R6. A noise and a detection pulse are separated.
- 3.3V are generated by R8 and R9, and this voltage standard and comparator are formed by the operational amplifier. A pulse shaping is carried out.
- The monitoring of operation voltage is pulled out from Cockcroft's first step. If it pulls out from the last stage, operation voltage will be affected due to impedance.
- A piezo-electric element makes detection sound as PUCHIPUCHI.
- When using an external power supply, it is good to use the stable power supply of 9V.
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