This circuit featuring a new quadruple operational amplifier was found in the March 1980 issue of Radio Electronics magazine. The circuit is to be powered by a symmetrical 15 V source.
This micro-transmitter for the 27 MHz band was found in a 1976 technical documentation. The...
This passive circuit was found in the March 1995 issue of Elexctonics Now magazine. The circuit is for...
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...