Found in an 80's Electronic Design, this circuit is based on the ICL7107 which is not an easy component to obtain today. The circuit is compatible with TTL and CMOS.
This circuit is from a 1977 timers Cookbook, but can still be easily assembled with the eventual 3130...
The circuit shown in figure 1 serves to control a servo motor with a current of up to 200 mA. The...
This timer circuit uses a unijunction programmable transistor. The time is given by the capacitor and...