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Electrical work

Here is the description of crowbar from the AeroElectric Connection.

http://www.aeroelectric.com/DIY/DIY_Crowbar_OVP_F.pdf

 

Here is my finished project.   I used a radio shack board and modified the lay out to fit.  Ordered the parts from Digikey http://www.digikey.com/

Total cost about $12

 

Here is the lay out.  I needed to modify it to work with the radio shack card. 
Here is the delta cad file. CROW BAR.DC