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 1980s telecommunications publication. The circuit uses a diode bridge to...
Mounting an oscilloscope is the dream of many of our Internet users, although it comes up against...
This is the traditional version of an astable multivibrator that makes two LEDs flash alternately at a...