Simple Geiger Counter
How does the Geiger counter work?First, I will explain the basics of how everything works. The Geiger counter uses a special tube filled with an inert gas at very low pressure to detect radiation. Inside this tube there is a cylindrical piece of metal that acts as a cathode. Inside this cylinder there is a small metal piece of wire that acts as an anode. When a high voltage is present at the anode of the tube, nothing happens, but when ray particles enter the tube, it causes ionization of the inertial time, and it starts to conduct an electric current. This current can be measured with special devices, but in this scheme there will be only a detection signal of the presence of radiation.
Geier counter circuitThe Geiger counter consists of two parts: a high-voltage power supply - a converter and a detector.In the above scheme, the high-voltage circuit consists of a timer 555, on which a generator is built. The timer 555 generates rectangular pulses, which through the resistor opens and closes the transistor periodically. This transistor controls a small step-up transformer. From the output transformer, voltage is applied to a voltage doubler, where it rises to about 500 volts. Then, the voltage is stabilized by using zener diodes up to 400 volts, necessary to power the tube of a Geiger counter. The detector consists of a piezo-electric element connected directly to the anoud tube without any amplifiers.
Tools and Parts
- Cutting Pliers.
- Stripper for stripping wires.
- Soldering iron.
- Gun withhot glue.
- Transformer 8: 800 - it was a transformer power source of a broken alarm clock.
- The tube of the Geiger is purchased -HERE.
- Timer 555.
- Resistors 47K (x2).
- Capacitor 22nF.
- Capacitor 2.2 nF.
- Resistor 1K.
- Any N-channel MOSFET.
- Development board.
- 1n4007 diode (x2).
- 100 nf capacitor at 500 volts.
- Zener diodes - 100 volts (x4)
- Piezoelectric element (from an old microwave oven).
- Pro Oda.
Generator Assembly with MOSFET Transistor
Solder the transformer and voltage doubler with stabilization
Adding a Geiger tube and detector
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