This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio Electronics magazine of April 1990.
This circuit is from a 1965 General Electric publication. It uses a thermistor to fire a reed...
We found this circuit in a 1972 documentation. The transistor, in fact, is a unijunction that can...
This circuit is from the 2005 Linear Technology Application Manual. It provides an indication of the...