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.
This indicator makes use of an LM339 voltage comparator circuit that contains 4 internal...
This circuit has a fairly common configuration consisting of a counter phase oscillator. The power...
The purpose of this Hartley oscillator is to produce the shot effect on a toy or other...