Need a Timing Circuit

[Lee Cross]

I am looking for a circuit that will trigger a pulse after waiting for 60
minutes.

Thanks
Lee

 

[Jeffrey Turner]

Lee Cross wrote:

I am looking for a circuit that will trigger a pulse after waiting for 60
minutes.

Can you be more specific, please? What voltages are involved? How
accurate does the timing have to be? What is the application?

--Jeff

--
A man, a plan, a cat, a canal - Panama!

Ho, ho, ho, hee, hee, hee
and a couple of ha, ha, has;
That's how we pass the day away,
in the merry old land of Oz.

 

[Lee Cross]

I am using it for a balloon cutdown device. I need a low voltage input or
single battery voltage weight needs to be the lightest possible then after
60 minutes turn a switch which heats a Neochromatic Wire.

"Lee Cross" <lcross@mail.utexas.edu> wrote in message
news:6t82c.32369$lS1.15867@fe2.texas.rr.com...

I am looking for a circuit that will trigger a pulse after waiting for 60
minutes.

Thanks
Lee

 

[Bill Bowden]

"Lee Cross" <lcross@mail.utexas.edu> wrote in message news:<6t82c.32369$lS1.15867@fe2.texas.rr.com>...

I am looking for a circuit that will trigger a pulse after waiting for 60
minutes.

Thanks
Lee

You might try this and change the 22uF cap on the left to 3300uF
and change the 47K to about 680K. You can fine tune the
time with the resistor value.

http://ourworld.compuserve.com/homepages/Bill_Bowden/page9.htm#555delay.gif

-Bill