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NI 9401 TTL to non-TTL signal

Hi Everybody,

I am using Labview FPGA modules. I want to trigger 5V relay.  I have got a NI-9401. This is 8 channel 5V TTL digital out module. But my relays isn't triggering with TTL signal.

Briefly, How Can I Use my TTL Signal to Generate a non-TTL Digital Signal?

 

Have a nice day!

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What relay are you using.  Generally, relays need a good amount of current in order to switch.  DIO generally cannot source that much current (2mA for the 9401 from what I can gather from the datasheet).  So you may need to add a buffer circuit to get the current draw you need.


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Hi,

 

I am using relay in attachment. I think this problem is about inadequate current. You are right. Well, may I do buffer circuit with Labview? Or is the buffer circuit only hardware? Can you help me ?

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That is quite a bit of coil current.  You may need a buffer chip and something like a Solid State Relay to control that relay properly.  Something like a SN74ACT245PWR  buffer chip with a DO061A SSR should do the job.


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Thank you for your advice

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