This circuit uses components of the time. We found it in a 1968 US documentation. The delay is 100 ns and the input impedance is 1 k.
This circuit was found in a 1967 Electronics World. SCRs are according the controller load,...
We found this configuration in an early 1977 publication. The PNP transistor may be the BC558 and...
This circuit of a Popular Electronics is intended to control a wiper. The circuit consists of a...