Other ways to convert - to + for door locks?

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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=444
Printed Date: June 07, 2024 at 11:05 PM

Topic: Other ways to convert - to + for door locks?

Posted By: Mr_Fusion
Subject: Other ways to convert - to + for door locks?
Date Posted: April 24, 2002 at 8:23 PM

Is there any other way to convert a negative signal to a positive signal without using relays for power door locks? Crimestoppers sells a device that they call a pulse inverter...that does just that but I want to know how. It is only $4 and I know for sure it isn't a couple of relays because of the size. Here is the website so you can see for yourself

https://www.logjamelectronics.com/crimcs6500dl.html

For people not familiar with Crimestoppers...off of the brains there are 3 wires for the door locks, 2 negative out for lock & unlock and they also have a positive wire for reverse polarity door locks...but I am not sure if it is a constant power out or just when it is needed.

Replies:

Posted By: tech_advice
Date Posted: April 25, 2002 at 6:35 PM

We use an inverter from autostart called an inv-200 it's about 1" by 1" by 1/2" thick, they work well, the one on the website looks to be the exact one we use only different wire colours, hopes this helps, by the way they're only good for a 500mva pulse, if you need a stronger pulse you'll have to use relays...hopes this helps....

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Don't share too many install secrets with your customers, pretty soon they won't need you!!!!!

Posted By: Thinkster
Date Posted: April 26, 2002 at 4:12 AM

You could use two PNP transistors and a few resistors to accomplish this. It's pretty basic electronics, your just using the transistor as a switch. The negative lock or unlock signal gets fed to the base of the transistor via a resistor (1K - 5K), The Emiter goes to 12V and the Collector would now be your Output. The Base can also have a 10K pullup resitor to 12V. Probably a buck or two in parts.