Toggle a LED with Push Button

Gayan Soyza

Active Member

• Oct 23, 2006

• #1

Can anybody give a circuit diagram that toggles a LED with a single push button,considering these options.

* must built from cmos or transistors without using pic ics.
* one push on state (Latch) next push off state (latch).
* must be speed switching no any delay time after pushing the button to on or off.(no propogation dealy)

 

O

on1aag

New Member

• Oct 23, 2006

• #2

Push on push off switch.

Hi Gayan Soyza,

Take a look here:

https://www.electro-tech-online.com/threads/newbie-question-pulse-on-off-switch.24533/#post167524

We answered your question a couple of days ago.

on1aag.

 

akg

New Member

• Oct 23, 2006

• #3

it is your homework
but a clue, can be done with Flipflop or multivibrator

 

Gayan Soyza

Active Member

• Oct 24, 2006

• #4

Hi akg Thats true.....

I Tried some flip flops and some multivibrators.but that didn't give more accuracy.when i switch off the circuit fm the power supply it changes the state.
its not good.

i tried some circuits with these ics

cd 4027 - has a delay
sn 7474 - not working correctly
sn 7473 - not working correctly

 

Gayan Soyza

Active Member

• Oct 24, 2006

• #5

hi on1aag thanks for ur diagrams.

earlier i tried some schematics but didn't work well.like cd 4027
have to try other ccts anyhow thanks a lot.i'll be in touch with u guys

 

akg

New Member

• Oct 24, 2006

• #6

Gayan Soyza said:

I Tried some flip flops and some multivibrators.but that didn't give more accuracy.when i switch off the circuit fm the power supply it changes the state.
its not good.

Click to expand...

this WILL happen unless you use some kind of non-volatile memory