pulsed to timed

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robbie2883

Copper - Posts: 104

Joined: August 20, 2003

Location: United States

Posted: April 15, 2004 at 10:53 AM / IP Logged

i have been racking my brain trying to figure out how to take a 1 second pulse and turn it into a timed output for a bosch relay. i know they make timed relays, but all the ones I find are like 50 and 75 bucks. I don't feel like spending that much. i'd like to just make it using some caps and resistors if possble. Thanks for any help.

if its jammed force it - if it breaks in the process it needed to be fixed anyway

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 15, 2004 at 11:07 AM / IP Logged

what do you want it to do?

After a pulse stay on fo a certain period of time?

robbie2883

Copper - Posts: 104

Joined: August 20, 2003

Location: United States

Posted: April 15, 2004 at 3:15 PM / IP Logged

yeah...about 10 seconds or so

if its jammed force it - if it breaks in the process it needed to be fixed anyway

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: April 15, 2004 at 4:15 PM / IP Logged

Use a 555 timer. One of the most versatile timers I have ever used. Options are almost limitless.

robbie2883

Copper - Posts: 104

Joined: August 20, 2003

Location: United States

Posted: April 15, 2004 at 10:35 PM / IP Logged

i've heard about these. they have them at radio shack right? can you give me any info on how to wire it up? it's an intigrated circuit right?

if its jammed force it - if it breaks in the process it needed to be fixed anyway

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 16, 2004 at 6:25 AM / IP Logged

its a small IC that can be used in a monostable set-up. here is a circuit and timing calculator. You may want to add a transistor to the output to drive a realy.... They can operate at 12V as well, no need to drop the voltage down.

robbie2883

Copper - Posts: 104

Joined: August 20, 2003

Location: United States

Posted: April 16, 2004 at 6:51 AM / IP Logged

thanks man....that will work. one thing though.....will the output be + or -?

if its jammed force it - if it breaks in the process it needed to be fixed anyway

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pulsed to timed

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