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Relay Instead of DPDT Switch?


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Jweb 
Member - Posts: 49
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Posted: May 11, 2015 at 3:44 PM / IP Logged Link to Post Post Reply Quote Jweb
For some reason my brain won't wrap around this application. I wired into a GM head unit to tap into the CD player input in order to run a MP3 player or ipod. I was going to just wire a mini DPDT switch to change the input from the normal CD player input to the MP3 input that goes to a 3.5mm jack. I was hoping someone here could help me diagram a relay to switch the input depending on which one had a signal. Is this easy or hard to do? Thanks for any help.
hotwaterwizard 
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Posted: May 19, 2015 at 7:24 PM / IP Logged Link to Post Post Reply Quote hotwaterwizard
Most are Grounded so it is easy. You must mount into a Metal Grounded Box to eliminate humm and Motor noise.Relay Instead of DPDT Switch? - Last Post -- posted image.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
howie ll 
Pot Metal - Posts: 16,466
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Posted: May 20, 2015 at 5:52 AM / IP Logged Link to Post Post Reply Quote howie ll
The above is best but if you want to use a relay, you need a voltage output from either iPod or MP3 and good luck with that!
The voltage output, probably 5 volts will trigger a DPDT relay with a 5 volt coil.
Jweb 
Member - Posts: 49
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Joined: September 19, 2004
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Posted: May 20, 2015 at 9:48 AM / IP Logged Link to Post Post Reply Quote Jweb
I already wired the switch but thanks for this. I don't think I'd be able to get a trigger from either input.
howie ll 
Pot Metal - Posts: 16,466
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Posted: May 20, 2015 at 9:49 AM / IP Logged Link to Post Post Reply Quote howie ll
Yes it means opening one up and bench testing, best of luck on opening one of them.Relay Instead of DPDT Switch? - Last Post -- posted image.
hotwaterwizard 
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Posted: May 20, 2015 at 8:02 PM / IP Logged Link to Post Post Reply Quote hotwaterwizard
I use an Audio Switcher on my amp because it does not have a aux power wire. It detects the audio signal input and provides 12v output to switch my amp on and off.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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