NOR gate with the 7400 (CB22406E)

The configuration below shows how to use the 7400 as a NOR function. The circuit is TTL and must be powered with 5V.

MOSFETs SuperFET III (COM034E)
It can be obtained from Mouser Electronics new superFETs III from Fairchild for voltages of 700 V...
RS Flip Flop (CB8925E)
This circuit was found in a 1969s American documentation. With modern components, it can be used...
Changing the frequency of the LED blinking (CB24661E)
The figure shows how to change the frequency of a 5 V LED blinking. The capacitor can have other...