This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency should be chosen for maximum efficiency according to the small transformer used.
This simple circuit, powered by 4 batteries or 9 V battery, brings together several functions of...
Figure 1 shows how the 4029 can be connected to count up to 10 and also up to 18. If pin 9 is...
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...