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Topic: 5V Relay Board 8 Channel Connections .. HELP (Read 9 times) previous topic - next topic

retrolefty




Hi JanaLaine,

Nice documentation of what You want to do!

But if my old eyes don't trick me, You mixed up the + and - of the 12 Volt supply to Your "external" valves.

0V must go to - minus of Your Valve coil and the + plus 12V get switched by the relays contacts and than must be connected to the +plus of the valves coil.

(+0V as You write is yes the Zero of the + PLUS 12 Volt supply, but "more" negative then the plus 12 Volt.)

rgds


Thanks for reminding me about the polarity. i missed that one out... -ve of the valve should be connected to -ve PS. thanks for that  8)

1 more question, if, let say, i have about 8 solenoid valve 12VDC, 500mA. What type of power supply should i buy?

- 12VDC, 1A? or 12VDC 4A?

If your actual application can have a requirement to turn all 8 outputs on at the same time then >4 amps is the answer. If only a single coil is going to be energized at any given time then a 1 amp supply would work.

Lefty


Thanks again,
Jana

JanaLaine

#6
Sep 06, 2012, 02:38 pm Last Edit: Sep 06, 2012, 02:41 pm by JanaLaine Reason: 1




If your actual application can have a requirement to turn all 8 outputs on at the same time then >4 amps is the answer. If only a single coil is going to be energized at any given time then a 1 amp supply would work.

Lefty






Thanks again Lefty... cheers  8)

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