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 filter, which rejects frequencies around 1 kHz, was found in the August 1993 Electronics Now...
This circuit was found in a Motorola manual from 1968. As it can be obtained 20 V at 15 kHz from...
With 8 to 30 V power supply, the output power depends on both the voltage and the load. The...