NAMUR input simulation

Thread Starter

Negativ3

Joined Dec 5, 2011
3
Hi All!

I have an arduino cct I can use for simulating the "shorting" of NAMUR inputs (+/-) to provide a signal input, and it works well.

I was wondering if its possible to do this in a single, self-contained circuit, drawing power from the NAMUR +ve rail?

I have ideas of using a 555 to set the pulse frequency, but not sure where to start on the output, shorting of contacts part... drive a transistor off the trigger output possibly?

Any guidance really appreciated.
 

Thread Starter

Negativ3

Joined Dec 5, 2011
3
Here is the cct I have so far but it's not pulsing to the base of the BC546.
Sw1 should be continuous mode, frequency set by Sw3 position. Sw2 is for a single pulse.

Any help appreciated...
 

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