This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
This circuit was obtained from Signetics documentation from the 1980s. The circuit can be...
This circuit is from a 1965 General Electric publication. It uses a thermistor to fire a reed...
This low frequency square wave oscillator using the 741 Operational Amplifier produces sound when...