Suggested by General Electric in a 1965 publication this circuit uses a light bulb. Can be changed to use LED and capacitor can be 22 uF.
The CMOS TLC555 can be gated from external CMOS circuits using the configuration shown here. The...
With this shield circuit it is possible to control several loads up to 500 mA from the parallel port...
This circuit can be found in other projects in this site. When S1 is open the circuit produces...