This circuit from Popular Electronics powers a small speaker. The transistor can be of general use and the capacitors can be altered to change the sound generated.
This circuit was found in a 1960 transistor manual from Sylvania. Transistors admit equivalents and...
This crystal oscillator is indicated for the calibration of IF steps of common radio receivers. The...
We found this oscillator in an integrated circuit manual from the 90's. The circuit shows how to...