Quote:
Originally Posted by
qlee72 /forum/post/17863099
I saw a guide on relay wiring on
http://ovo.ca/wiring/wiring.html and had some specific question regarding applying this technique to using a fan for 4000U. In particular, 4000U has a 12V trigger out (100mA) with a 1/8 monaural jack. I want to connect this a relay that will control a computer fan (12V 150mA) when the projector is on. I have a 12V 150mA wall wart (which works fine when connected to the fan).
Based on Fig 1 from the Website referenced above, would I do the following:
1) Connect the (+) red wire from the wall wart to 30 (is this labeled as COM on the relay?).
2) Connect the 1/8 monaural jack to the projector; strip the opposite end and connect (+) end to 86 and (-) end to 85; 86 and 85 is the coil on a relay.
3) Connect the (+) red wire from the fan to 87 (labeled NO on relay?; I guess the figure isn't a 5pin, which would have NC, which would be the default connection to the switch w/o input from trigger) and (-) black wire from the fan to the (-) black wire from the wall wart.
4) Optional: Insert a greater than 150mA fuse between (+) red wire from the wall wart and 30.
5) Optional: If I want to connect 2 12V 150mA fans, repeat #3? Do I need a wall wart with 300mA output, that would require a ‘stronger’ fuse, since the fans are in parallel circuit?
additional questions: there are so many different types of relays. Do I get a 12V 30mA 5 pin (SPDT) relay or do I need one with higher amp, say 1A?
Here's another example for 4 pin:
http://www.r1200gs.info/howto/relay.html
4pin relay (SPST)?
connect (+) from wall wart to #3 and (-) or ground from wall wart to #2.
connect (+) from fan to #5; connect (-) from fan to #2 also?
connect (+) from 12V trigger to #1. Is there only 1 wire in a 1/8 wire?