Can u light up the LED...

391

07:00:19

On the left u can see 2 switches and an LED.
Only the right switching progress will light up the led. Find it out!!

published 12 years ago

Secuture

12 years ago

....i feel dizzy o.O

keo996

12 years ago

Easy :-)

YuHan

12 years ago

Both switches on 6V voltage the led light, but there's a condition: initial both input is zero. First turn on bottom switch(input is "1")and keep it, then turn on top switch(input is "1")and you see the light, even you can turn off it by make the top switch to gnd and turn on again the result isn't changed. If you turn on the bottom switch after LED light, you'll lose the balance and light gone forever when turn it back. So someone can explain it?

kehu

12 years ago

The light never turns off for ever. If u know the right switching progress. And your first method sould not work. I think there is an unstable starting stat thats why it works for the first time.

YuHan

12 years ago

I check again and u used two DFF(master_slave_RS: 11 gates=3 INV +8NAND) and three AND GATES. I pretty sure your circuit is incorrect because your bad layout style(maybe you want to protect your work, however the wire is automatic) so that you can't find where is wrong. So, I'm curious what's your original idea? Don't be bored me , sometimes i just writing to avoid embarrassed for my poorly English.

kehu

12 years ago

Yes. The original layout wad pretty nice. I shaked the elements after i thougt the circuit is ready.

kehu

12 years ago

The original idea was that you have to switch in a correct order. The original correct process is: upper -> 1 , lower -> 0 -> 1 , upper-> 0, lower -> 0 -> 1 , upper -> 1. If u do this switching the LED will always light up.

YuHan

12 years ago

Sorry, i care about the function not light it up.

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