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Having problem triggering an external device needing 5V DC

I am having a problem throwing open a solenoid valve with 5 volts DC. The valve requires 5V DC, and it seems that I am getting a response from an LED on the valve, but the valve will not open. When I attach the valve to a 5V battery, the valve has no problem, and the LED has a stronger intensity to it. I am using Visual Basic to program the valve switching event with a 6024E card and CB-68LP board. Also, would it matter if this were a pulsed DC voltage as opposed to a constant DC voltage?
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The most probable reason for this behaviour is that the solenoid valve requires too much current to switch. Daq cards are limited in the available current, so you will probably have to use an auxiliary switch and a separate power supplier to drive the solenoid.
Roberto


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