This circuit was found in a 1965 US documentation. The circuit converts a DC signal to a 400 Hz AC signal. Transformer data was not provided.
This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits...
This is the typical circuit of a local oscillator for a superheterodyne FM receiver. The circuit...
Found in a 1968 Motorola publication, this circuit generates a high-powered audio tone when...