This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s...
Although the AM has its days numbered, this is a simple receiver, quite sensitive by the number of...
The circuit shown consists of a power stage for relay excitation. 2N3053 can be a BD135 and 2N406...