This circuit is from American documentation from the 70s. The circuit makes use of the operating system of the time, but it can be implemented with more modern equivalents.
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...