This circuit, which uses a quadruple comparator, was found in old American documentation. The response curve is shown next to the diagram and can be adjusted in the trimpots.
This amplifier provides a maximum power of 7 W, depending on the supply voltage. The integrated...
This old oscillator using germanium transistors has a high impedance headphone as inductor to...
This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA...