This optical sensor circuit for a robot was found in the March 1986 issue of Radio Electronics magazine. It controls two motors according to signals from optical sensors or couplers.
This stereo preamp uses only two germanium transistors. The circuit was found in old documentation using...
I found this circuit in a 1989 American publication called Electronics Handbook. The circuit...
This is the power source suggested in the old European publication for the CB19635E watch. The...