This polarity inverter circuit for voltages down to about -12 V was found in the December 1992 issue of Radio Electronics magazine. The current is a few mA.
This circuit is from an Electronic Design of the 90's. The circuit can be implemented with more...
We find this encoding circuit in an American 1980s amateur radio documentation. The circuit can be...
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...