This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an automatic transmission circuit for telegraphy. The circuit is TTL.
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...