This circuit makes use of an unusual Analog Devices component today. The circuit is from a 90's documentation. The amplifier has 80 dB gain.
This receiver was found in a 1968 publication, but can be mounted with a BC548 and BC558 in place...
This circuit shows how to implement a TTL compatible oscillator using a transistor. The circuit is...
Found in an ancient American documentation, this circuit has the basic configuration of a crystal...