This circuit for the 1750 m band was published in the September 1989 Radio Electronics magazine. The range depends on the antenna system and receiver used.
This circuit automatically inverts the test leads connection according to the polarity of the...
With a touch of the push button the lamp is switched on. A new touch and the lamp go out, in this...
This 80's circuit uses a light-sensitive SCR or LASCR and a one-sided silicon switch SUS, uncommon...