pls sum1 cr8 or give me a schematic diagram for a countdown timer using 74LS192

[Phthonos]

parang awa nio na po pahingi po ako ng schematic diagram for timer n prng kgya nung sa basketball game, countdown po xa den pag umabot n po xa ng 00:00 mag bu-buzz po. ni  po kasi s project eeh. . . thx in advance

[Oj0vO]

marami po yan dito hanapin mo lang, share ko lang ginawa ko in simulation.

[motion55]

Bakit pilit ninyo gagamitin ang 74ls192? Major problem niya ay ang asynchronous preset. Preset is needed when it counts to 00 seconds and then you need to preset to 59 seconds. It needs more devices to avoid the race condition. I'd avoid using it.

[e-tronix]

anu naman ginagamit mo master instead sa 192.

[motion55]

74LS169A Synchronous 4-Bit Up/Down Binary Counter with synchronous preset

[e-tronix]

tnx, il take that as reference.

[motion55]

Although it's a binary counter, it can easily be converted to a BCD counter. Besides, the seconds count has to preset to "59" seconds after "00" seconds. Synchronous presets avoid race around conditions on presets.

Pag may time, I will take a shot at making a schematic as requested by the TS. Di bale kahit matagal na.