We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
This amplifier was obtained from the CA3140 datasheet, an operational amplifier with JFET at the...
The circuit shown in the figure can act as a home repeater for AM signals from the output of an...
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...