- #1
minhduc515
- 12
- 1
i'm new on creating my own circuit. And I'm trying to create a digital clock, using 74ls90+74ls47
I have problem on creating 1hz square pulse part.
This is my teacher's Simulation
I have searched on google that i can create 1hz pulse by using NAND gate, crystal, or Ne555, but i can't find any document have image same to my teacher's simualtion
Anyone can explain me how that circuit work ? And how i can choose value of resistor, capacitor ? (eg :R43 = 4k7, R44 = 1k, C3 = 100uF ..)
(Link to the simulation, using Altium Designer : https://www.mediafire.com/?a4yljeglibk9rei)
Sorry for my bad English :D
I have problem on creating 1hz square pulse part.
This is my teacher's Simulation
I have searched on google that i can create 1hz pulse by using NAND gate, crystal, or Ne555, but i can't find any document have image same to my teacher's simualtion
Anyone can explain me how that circuit work ? And how i can choose value of resistor, capacitor ? (eg :R43 = 4k7, R44 = 1k, C3 = 100uF ..)
(Link to the simulation, using Altium Designer : https://www.mediafire.com/?a4yljeglibk9rei)
Sorry for my bad English :D