This circuit for musical instruments was found in a 90’s Elektor. The circuit still applies, as the components used can still be obtained with some ease.
June 2017 - New high power TVS for high-power retention applications with bi-directional features...
This fast-acting circuit uses any phototransistor as a sensor. The circuit drives a 30 V relay, but...
This transistor can use any general-purpose germanium transistor like CK722 or 2N107. The circuit is...