We found this circuit in an American publication from 1977. The circuit drives two LEDs according to the control of the inputs. The technology is TTL requiring 5 V to power supply.
This stepper motor control was originally designed to use a PC's parallel port and is quite simple...
This is the traditional source using the LM317 3-terminal regulator circuit. The same source can...
This counter from 0 to 9999 was found in English documentation. The power source must be 5V with...