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.
We found this circuit in the October 1993 Electronics Now magazine. The 4-channel circuit is...
This circuit takes advantage of the noise generated at the junction of a zener diode of any type....
This circuit is another practical idea for places where they still receive signals from analog TV. The...