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.
The purpose of this circuit is to increase the sensitivity of a galvanometer, making it possible to...
We found this configuration in documentation from the 1980s. It applies to almost any operational...
This circuit shows how to use a 12 V regulator to obtain a higher voltage output. The...