Simple Led On-off Circuit

T

TheSwede73

New Member

• Jan 20, 2009

• #1

Hey!

Could anyone please tell me how i can build a simple led, on-off, circuit?
And the LED needs to be lighted with a single push, so i guess i need to involve a microchip?
I have programmers and stuff so i could manage that if someone could tell me how the schematics would be...

Please!

 

duffy

Well-Known Member

• Jan 20, 2009

• #2

Doesn't HAVE to have a microchip... could you simply use a push-on, push-off switch? They are sometimes called "alternate action" switches. Press it once, it's on. Press it again, it's off. Like that?

 

Q

q5101997

New Member

• Jan 20, 2009

• #3

No MPU's needed

Try this. The 555 acts as a single-shot monostable which stops switch bounce triggering the 74LS93 binary counter more than once. Switches usually stop bouncing well before 50mS, so set the monostables period to 1.1RC = 50mS, where R is in Ω, and C is in F. If R = 10kΩ, C = 50m/(1.1x10k) ≈ 4.7µF. For mor info, check out: 74LS93 pdf, 74LS93 description, 74LS93 datasheets, 74LS93 view ::: ALLDATASHEET ::: and The 555 Monostable Circuit - Electronics in Meccano
Bye
Pete

 

Q

q5101997

New Member

• Jan 20, 2009

• #4

I forgot the diagram, here it is.

Here's my idea for a on-off LED switch.

 

Attachments

• LED on-off.JPG

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Y

yafch

New Member

• Jan 20, 2009

• #5

did you mean a push button? like a micro switch? to toggle the led on/off. if so then you should try google.may not need to involve a microchip other then if you insist.

 

T

TheSwede73

New Member

• Jan 20, 2009

• #6

Definately microchip based

Thanks for the fast replies!!

Microswitch yes, which dosen't stay in pushed position!

There are some examples on Google, i will look for the easiest way, or the smallest circuit I would say.
The smaller, the better

Something involving the 555 seems good

 

audioguru

Well-Known Member

Most Helpful Member

• Jan 20, 2009

• #7

This simple circuit will do it:

 

Attachments

• alternate action LED2.PNG

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T

TheSwede73

New Member

• Jan 25, 2009

• #8

Wow, you are just a master with electronics, can we swap brains for a day? so i can learn some more....

I'm thankful for this forum, and i will surely ask something again!.

Thanks for being there!

Sweden over and out for now

/Anders