I collected it to metal detector Pirate! Although you can apply it anywhere!
After assembling the circuit, instead of the resistor R2 (82 kOhm), we solder the potentiometer to 100 kOhm. connect to the lab, and set 10 volts, you can do any other! and turn the potentiometer to the brink of a glow or a very dim glow (if it succeeds) After we measure the resistance on the potentiometer, and solder a constant resistor!
