trans od controller
Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=137010
Printed Date: May 10, 2025 at 3:23 PM
Topic: trans od controller
Posted By: marklein
Subject: trans od controller
Date Posted: July 27, 2014 at 3:55 PM
I am using an overdrive trans in an older vehicle. I need to be able to turn on an overdrive solenoid using the ac signal from a vss. The solenoid only requires about 1 amp of current. I would like it to switch at about 5.5v ac, which is about 40 mph. Can anyone help?
Replies:
Posted By: i am an idiot
Date Posted: July 27, 2014 at 6:22 PM
Define "Older Vehicle"
Posted By: marklein
Date Posted: July 27, 2014 at 7:50 PM
70 dodge d100 with a 1990 a518 overdrive.
Posted By: i am an idiot
Date Posted: July 27, 2014 at 8:12 PM
Posted By: marklein
Date Posted: July 27, 2014 at 8:56 PM
Trans has a speed sensor in it already. Builds 5.5v ac at 40 mph. That is the point where I'd like it to go to overdrive.
Posted By: i am an idiot
Date Posted: July 27, 2014 at 10:22 PM
Set your meter to DC voltage and give me readings at 20, 30 and 40MPH.
I am thinking a simple comparator circuit may be what you are looking for.
Posted By: burntkat
Date Posted: August 04, 2014 at 1:14 PM
Contact "bowtieoverdrives.com" and tell them what you want. Pretty sure they already have this, even though it's for a GM 700r4.
No sense in reinventing the wheel.
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"Always listen to experts. They'll tell you what can't be done, and why. Then do it. - Robert A. Heinlein"
Posted By: oldspark
Date Posted: August 04, 2014 at 5:55 PM
Could simply bridge rectify & filter the AC and use a comparator, but I'd consider using a voltage to frequency converter like the LM2907 or LM2917 (overspeed switch) as that removes the analog voltage issue.
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