Found in old documentation, this circuit consists of a simple power source where the transistor must be equipped with a heat sink. A indicated transistor can be the TIP32.
This simple electroscope with bipolar transistors is not the most sensitive, but can detect static...
This oscillator for various frequencies was obtained from a 1980s telecom documentation. The...
This circuit is from a July 1970 Radio Electronics magazine. The sensors are metal probes. The 18 V...