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 circuit was found in Philips documentation from 1967. The components are of the time, being...
This simple NPN and PNP transistor tester configuration can use the low current range of a common...
Designed for battery-powered applications with output voltages from 0.8 V to 1.2 V the regulator shown is...