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3D TV, High Definition Television, HDTV 4K and AV
Hi Fi section
Second life for a good old car stereo
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<blockquote data-quote="jeallen01" data-source="post: 1057128" data-attributes="member: 176704"><p>12V supply to the coil of a 12V 2-way relay, Common contact to the radio, Normally Open contact also connected to the 12V supply, Normally Closed contact connected to the 9V supply - when 12v is being supplied, it goes to the radio, and when the 12v supply is disconnected then the radio is supplied from the 9V memory-retention battery.</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1057128, member: 176704"] 12V supply to the coil of a 12V 2-way relay, Common contact to the radio, Normally Open contact also connected to the 12V supply, Normally Closed contact connected to the 9V supply - when 12v is being supplied, it goes to the radio, and when the 12v supply is disconnected then the radio is supplied from the 9V memory-retention battery. [/QUOTE]
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3D TV, High Definition Television, HDTV 4K and AV
Hi Fi section
Second life for a good old car stereo
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