We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR when the battery is fully charged.
The basic idea of the circuit shown in the figure is to increase the brightness of an ordinary...
With the appropriate choice of C1 and C2 it is possible to divide the frequency of a rectangular 3 V...
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...