This 1968 circuit is intended to switch the polarization of a satellite TV antenna of the time. The circuit is powered by 12 V and the transistors are from that time.
The presented circuit is suggested by National Semicondictor in its 1994 Linear Applications...
This circuit is from 1985 documentation. The integrated circuit used is not very common today, but...
Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the...