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.
I found this circuit in a 1978 publication. The circuit can be assembled with a BD136 transistor to...
This basic TTL watch and minute clock circuit was found in European documentation from the 1970s....
This simple windscreen wiper interval was found in old American documentation. The relay must have...