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trans od controller


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marklein 
Member - Posts: 3
Member spacespace
Joined: July 27, 2014
Location: Alberta, Canada
Posted: July 27, 2014 at 3:55 PM / IP Logged  
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?
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 27, 2014 at 6:22 PM / IP Logged  
Define "Older Vehicle"
marklein 
Member - Posts: 3
Member spacespace
Joined: July 27, 2014
Location: Alberta, Canada
Posted: July 27, 2014 at 7:50 PM / IP Logged  
70 dodge d100 with a 1990 a518 overdrive.
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
marklein 
Member - Posts: 3
Member spacespace
Joined: July 27, 2014
Location: Alberta, Canada
Posted: July 27, 2014 at 8:56 PM / IP Logged  
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.
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 27, 2014 at 10:22 PM / IP Logged  
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.
burntkat 
Copper - Posts: 143
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Joined: October 26, 2003
Location: South Carolina, United States
Posted: August 04, 2014 at 1:14 PM / IP Logged  
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.
"Always listen to experts. They'll tell you what can't be done, and why. Then do it. - Robert A. Heinlein"
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: August 04, 2014 at 5:55 PM / IP Logged  
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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