Quote:
Originally Posted by Stretch
Even this simple electrickery has me confused.
To me a diode is a non return valve - how can a non return valve in parallel help with anything? Assuming the flow is from positive to negative - what would come up from the earth that would need to flow the opposite way?
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Here's a good paper on the subject. It shows a suppressing diode across the relay or the switch. It is more common to have it across the relay.
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCsQFjAA&url=http%3A%2F%2Fwww.te.com%2Fcommerce%2FDocumentDelivery%2FDDEController%3FAction%3Dsrchrtrv%26DocN m%3D13C3311_AppNote%26DocType%3DCS%26DocLang%3DEN&ei=RkCrUuKZGMipsQTb6YHIDw&usg=AFQjCNFh9HS5tLUuL8CFri4nlwb6sksRlg&bvm=bv.57967247,d.cWc&cad=rja
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