With this circuit it is possible to measure RF signals with a common multimeter. Signals up to 200 MHz can be detected. The diode supports general-purpose equivalents.
This timer for short intervals was found in a documentation from 1966. The transistor is made of...
This powerful FM transmitter with FET can reach more than 1 km in favorable conditions. L1...
This general-purpose crystal oscillator was found in documentation from 1960. The circuit uses...