We found this circuit in an American 1980s documentation. The circuit uses a piezoelectric transducer unusual in our day. The transistor is general purpose type.
Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a...
Found in Motorola documentation from the 1970s, this circuit makes use of period components. The lamp is...
This notch filter was found in National Semiconductor documentation from the 1980s. Operational...