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.
We found this circuit in an old publication. The transformer has a 9 or 12 V secondary, and the...
This experimental amplifier was found in the 1960 Mullard transistor reference manual. The...
This circuit was found in the September 1974 issue of Radio Electronics magazine. It consists of a...