This amplifier was found in a 1970s documentation. Darlington transistors can be replaced for modern equivalents of at least 80 V x 2 A, equipped with good heat sinks.
This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined...
This circuit produces a good power audio signal, whose frequency is controlled in the...
This MOSFET circuit for microphone applications was found in the December 1969 issue of Radio...