Hi guys, how can I activate a switch by pressing it once but I want the power to flow continuously for 1min I was told to use a 555 timer on a bistable layout.

Which components would I need exactly. It is to run on a 12v DC power supply.

Thank you

 

I thought you wanted to press the switch two times?

http://forum.allaboutcircuits.com/showthread.php?t=54505

 

Hi guys, how can I activate a switch by pressing it once but I want the power to flow continuously for 1min I was told to use a 555 timer on a bistable layout.
Thank you

This circuit should work fine

Pin 4 goes to Vcc.. Take a look at 555 datasheet.
Regards,
Simo

 

A 555 timer in bistable mode will keep the output on until you reset it. What you want is a 555 in monostable mode (like the one simo_x posted). Here's one that is more complete:

A 1000uF capacitor and a 56K resistor should give you a delay of about a minute. If you want it exact, I suggest you get a 100K variable and set it to where it gives a 1 min. output.

EDIT: Forgot to mention-- Put a normally-open push-button switch between "trigger" and gnd, with a pull-up resistor (about 4.7K)

 

how much current will your load draw? You might want to consider using a relay so your 555 doesn't heat up too much.

 

A 555 timer in bistable mode will keep the output on until you reset it. What you want is a 555 in monostable mode (like the one simo_x posted). Here's one that is more complete:

A 1000uF capacitor and a 56K resistor should give you a delay of about a minute. If you want it exact, I suggest you get a 100K variable and set it to where it gives a 1 min. output.

EDIT: Forgot to mention-- Put a normally-open push-button switch between "trigger" and gnd, with a pull-up resistor (about 4.7K)

I started to comment about the lack of pull up resistor, then saw your edit. It is a major flaw. The pull up resistor is not optional, and it wasn't too long ago I had to argue about it in another thread.

 

Yup I do. Basically my circuit involves 3 feature.
1 double tap the switch to activate power
2 after activating power, I want the power to run con
3 to press the button again to break the circuit. to stop the 1min run

 

That is wicked, thanks a whole bunch mate. I shud b making my circuit this weekend

 

how much current will your load draw? You might want to consider using a relay so your 555 doesn't heat up too much.

To be honest i'm not sure yet.
The input power is 12 volt. I'm making a little entertainment feature for my ride

 

Please see http://forum.allaboutcircuits.com/showthread.php?p=362800#post362800
for more detals of the project which may change some views.
THANKS

 

Hello,

Lets continue in the other thread and stop scattering with all the threads.

Bertus