SCR? solid state relays
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=57459
Printed Date: May 15, 2024 at 7:02 PM
Topic: SCR? solid state relays
Posted By: 03sdccfx4
Subject: SCR? solid state relays
Date Posted: June 10, 2005 at 8:11 PM
I need to have a device that will make the turn signals, and marker lights on a trailer a seperate circuit from the truck. I would like to do this without using mechanical relays. I am needing to use something solid state, I believe SCR's would be the correct application for this Could anybody send me a schematic or at least provide me with some part numbers? I think a 20amp or better RMS rating will do ------------- '03 F-250 CC Fx4
Replies:
Posted By: christophe
Date Posted: June 11, 2005 at 9:12 AM
even easier a company called hoppy actually makes the product. you can find this at any trailer supply company. good luck
Posted By: hotwaterwizard
Date Posted: June 11, 2005 at 11:49 PM
SCR's will Latch with DC. Transistors Could Do the job Exactly what are you trying to do? But how would you Charge the Battery on the Trailer? Trailer Isolator https://www.vpaccessories.com/Trailwr.jpg https://www.kriss.com/signalcontroller.htm ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: 03sdccfx4
Date Posted: June 13, 2005 at 12:13 AM
The battery will be on trucks still I just need higher capacity circuits to run all the lights on the trailer(s). I could do it with relays but, solid state would be nicer. Left Turn/Brake Right Turn/Brake Marker Lights I will use the truck feed for these lights to trigger what ever it is I will use. Thanks ------------- '03 F-250 CC Fx4
Posted By: hotwaterwizard
Date Posted: June 13, 2005 at 11:31 PM
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: June 14, 2005 at 12:07 AM
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: 03sdccfx4
Date Posted: June 14, 2005 at 2:49 AM
I am slightly confused on the diagrams where does the load connect? I will be feeding whatever I use with a fused 20-30 amp circuit. Then the unit will feed the trailer plug in. The truck wires will be used for the trigger. I don't see where the higher current would come into play here? ------------- '03 F-250 CC Fx4
Posted By: 03sdccfx4
Date Posted: June 14, 2005 at 3:00 AM
Ok thought about it some more, I need a circuit that will switch the positive with a positive trigger. I am thinking it will take two transistors to do this right? I think I need to use a positive switch for the load with a smaller transistor as a negative switch to get my positive trigger changed to a negative trigger. Am I on the right road here? ------------- '03 F-250 CC Fx4
Posted By: hotwaterwizard
Date Posted: June 14, 2005 at 10:00 PM
Yes you are on the right track. And the Light Bulb is the Load ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: 03sdccfx4
Date Posted: June 14, 2005 at 10:06 PM
What would be a suitable smaller transistor to use for the trigger, since it will not have the current flow the load will. ------------- '03 F-250 CC Fx4
Posted By: hotwaterwizard
Date Posted: June 14, 2005 at 10:36 PM
Revised and simplified Drawing 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
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