This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to produce a tone on a transducer when transmitting messages in SSB telegraphy.
This circuit was found in the September 1996 issue of Electronics Now magazine. The sound provided has...
We found this circuit in a March 1961 Radio Electronics magazine. This circuit reaches 100 MHz...
Using the M1575 this switching converter was found in National Semiconductor documentation from...