This circuit was found in the April 1983 issue of Radio Electronics magazine. Its purpose is to couple an antenna to two receivers without problems with coupling losses.
The two circuits shown trigger relays with temperature variation, the first being the type that...
This circuit trips with negative pulses and the value of C depends on its intensity. C1 determines the...
This circuit was found in a 1980 publication. It uses only 3 easily obtainable transistors. It is a...