Found in a 90s ARRL Handbook, this circuit is intended for the production of signals in the side bands for transmission in SSB.
With the coded activation of the relays, it is possible to control which of the 16 outputs...
The integrated circuit used in this application is not very common. Transistors and resistors...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...