extend very short contact a little longer
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=123207
Printed Date: May 14, 2025 at 5:54 PM
Topic: extend very short contact a little longer
Posted By: janhgm
Subject: extend very short contact a little longer
Date Posted: August 22, 2010 at 6:11 PM
Hi,
I have an appliance that makes a very short momentary electrical contact.
Contant duration is less than 2 ms. This is enough to be recognized by my computer but I want to use it to fire my photoflash immediately
Therefore I need a solution behind my first contact that acts immediately and will endure the momentary contact a little longer to allow photoflash to discharge.
I assume that I need to hold the secondary contact for 150 - 250 ms.
I assume that such kind of solution are developed earlier.
I would say something with a 555 timer.
If you know such a solution please let me know.
Jan
Replies:
Posted By: oldspark
Date Posted: August 22, 2010 at 6:32 PM
Are you sure?
What type of flash needs a trigger long enough for full discharge? Those I am familiar with merely need the trigger (excluding power & ancient flashers - not that I have kept up with the latest).
Any capacitive discharge flash should only require a trigger.
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