This interesting circuit of an Electronic Design stores the highest voltage of two applied to its inputs. The circuit is from 1964 and can be adapted to use modern components.
This simple transistor tester circuit was found in the February 1968 issue of Radio Electronics magazine....
A touch of the X1 sensor causes the motor to be activated for a time that can be adjusted in P1....
This is a traditional flasher configuration with two neon lamps. The frequency is given by the 100 nF...