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.
With this circuit it is possible to obtain a voltage of 24 V using a 12 V regulator. The maximum...
We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the...
This circuit was found in a Hands On Electronics from the 90s. It turns on an LED to indicate that...