Found in a 90s EDN, this circuit uses components from that time. The circuit supplies a current of 100 mA with a 5V voltage.
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...