This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
This simple injector circuit can actually be powered by voltages from 3 to 9 V. The frequency is...
This common metronome configuration has already appeared in several of our articles and projects. This...
The purpose of this 1-transistor amplifier is to allow the use of a milliammeter in an application...