The circuit presented was suggested by National Semiconductor in its Linear Applications Handbook. The circuit also applies to other 3-terminal regulators.
This circuit is for transducers (headphones or speakers) of 200 to 300 ohms. The frequency is...
This circuit uses only two transistors, the first being low noise, being indicated for dynamic...
Found in 1960's Radio Electronics, this circuit provides an audio tone that depends on the logic...