Found in a 90s English documentation, this circuit consists of an RF detector for testing in RF stages. The diode can any germanium type.
This modulator can be used in a data link or other signals up to 200 kHz. Range can be achieced...
We found this circuit in a Radio Electronics magazine from June 1992. The circuit has a power...
This circuit detects sunlight at dawn by triggering an audio oscillator. The photo transistor can be of...