As shown in the figure, one pin of the OR gate will have a one-time pulse with a pulse width of 50ms, and the other input is connected to the output and grounded with a 1KΩ pull-down resistor. At the same time, the output of the OR gate is connected to a light-emitting diode through a 100Ω resistor to drive the diode to emit light. Is there any flaw in this design? I have simulated it and tested it out with a breadboard. It is all right, but why can’t I see this design in general designs? According to this design, can the 4 OR gates of a 74LS32 light up 4 LEDs at the same time?
Savion 發表於 August 28, 2020
The application of this circuit is very small, and it is not much different from the power indicator; if one can light up the LED light, 4 OR gates can also light up 4.
Mikel 發表於 August 28, 2020
The 1KΩ pull-down resistor has too much ground current, and the 100Ω resistor and the diode connection are also too current.
Lourdes 發表於 August 28, 2020
It can't be turned off after lighting up.
