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npn transistor

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=104514
Printed Date: May 16, 2024 at 2:24 AM


Topic: npn transistor

Posted By: adhuot01
Subject: npn transistor
Date Posted: May 06, 2008 at 3:30 AM

Will an NPN transistor work as a switch if the base voltage is positive and the collector voltage is positive to out put positive voltage, if so what specific transistor will do this? A 3904?  I'm trying to keep and LED on 30 seconds after the power is switched off and I thought I could put a capacitor at the base.  Any comments?

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Andy Huot



Replies:

Posted By: i am an idiot
Date Posted: May 06, 2008 at 4:39 AM
Yes a pnp transistor and a capacitor will do what you are trying to do. A 3904 should be fine. I doubt that it will get hot, but you need to monitor it to see.


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