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.

Percussion Circuit (CB20308E)
This circuit produces the sound of percussion such as blocks, drum, bell, etc. The frequency...
Intense Signal Oscillator (CB19366E)
We found this oscillator in a publication from the 1960s. The frequency is around 600 Hz with the...
Audio Frequency Meter (CB20477E)
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...