03-07-2018 11:20 AM
Hello community
I have a USB 6001 Ni card in a program that will drive a Opto22 G4 relay to turn a motor on and off using a digital output
The problem I am having is the output of the 6001 about 3.3 volts ( high) dosent have enough current to Switch the relay
if I connect the relay ( opto22 G4) up to a simple 5Vdc power source then the relay switches solid but with the USB6001 there is not quite enough power to do this .
Can anyone provide me with an inexpensive solution that will provide enough power to switch this relay ?
I think the opto22 G4 relay requires 12Ma to switch and the Ni usb6001 card will only provide 4 ma
your thoughts ?
thanks
03-07-2018 12:36 PM
@Billshull wrote:
I think the opto22 G4 relay requires 12Ma to switch and the Ni usb6001 card will only provide 4 ma
Please watch your capitalization with units. It makes a big difference, especially between Mega and milli. So if the relays need 12mA, you could get away with a simple level shifter/digital buffer circuit. I have used these with a lot of success: SN74LVCC4245APWR.
03-15-2018 07:40 AM
Thanks I will give it a try
After all the chip is only 1.23 each
but I will have to wire it up and make a breadboard for it
lol
03-26-2018 11:31 AM
I received the SN74LVCC4245APWR Chips today only to find they are Super small no way I can use this since they are 1/2 thumb nail size ?
perhaps a pull up resistor will work has anyone tried this ?
if so how would you make this work ?
03-27-2018 07:53 AM
Hi Billshull,
You can't ask the device for more current than what it is capable of providing. As you said, the limit for the DO is 4 mA, so if you try to obtain more than that, it shouldn't give it, and it could even get damaged if it does. Maybe you could use a transistor connected to an external power supply as the current provider, and use the DO as the control signal for cutoff-saturation working? You would just need to calculate the collector and base resistors in order to get this working mode for the transistor.
03-28-2018 02:11 PM
yes
This I think is my only option besides buying a Ni card that has enough power to do the job
Looking into this now
thanks for the help
I will let you know my solution soon