At 20ma ....i think you got the solution !
http://www.ebay.com.au/itm/Mini-1-Ch...item461ad3e7fa
I found this cheapy , is it working on the same principle ? they say TTL source for the signal , i guess it needs
another source (5volts) to trigger the relay ....not very familiar with Arduino system.
Originally Posted by winterbrew
Thanks Tman - will let you know
This is also quoted in the ebay text ;
A bit confusing, as it says 1 channel, but shows 2 x VCC inputs, which I originally assumed would be for a second channel ?
It also says 5V relay, whereas mine, you could specify various input voltages, 12V, 24V etc. I'm not upto speed on electronics, so will let one of the others chime in !
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Tman (06-16-2014)
It has two Vccs because of the isolation circuit (opto-coupler). For your application they can be connected together. The Ctrl input would go to the relay wire on the ALP, and Vcc would go to a 5V supply (you may have to use a 7805 or 78L05 regulator or something). If you're using an Arduino it would have a 5V supply on-board.
A circuit with a 12V relay and a transistor would be simpler to implement since you wouldn't have to provide a 5V supply.
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Tman (06-16-2014), winterbrew (06-16-2014)
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