This crystal oscillator is indicated for the calibration of IF steps of common radio receivers. The transistor admits equivalent as 2N2222 or BF494. The circuit is from an old American publication.
In the figure we have an amplifier step configuration with a transistor suggested by a 1985...
This small telegraph transmitter has a range of a few meters, operating at a frequency that...
This circuit is from an old documentation. Integrated circuit 723 is not common today. The power...