> As of this moment I am not using any sort of filtration Just a simple > Current sink driver as the first scenario described here > http://www.die-wuestens.de/iz/IN9-2.pdf > Any help in designing or implementing someone elses design would be much > appriciatied.
That's a valid design, but it's designed to work with an analog signal. There are a couple of ways you can attack it. Since there's already a resistance in the circuit, you could build an RC filter around the transistor by simply connecting a capacitor in parallel with it. I think the default Arduino PWM frequency is 500Hz, which would need about 10µf with the 270Ω resistor. That's a pretty large capacitor, since I think it would have to be able to withstand the entire supply voltage. The other approach is a little more complicated - you'd need to put a higher impedance RC filter (smaller capacitor and larger resistor) on the output side of the optocoupler and then use the output of that to drive a separate transistor to control the IN-13. > Why are you using an optocoupler in the first place? > > I was under the impression that the output of this optocoupler would be the > same as say an MJE340, As for the reason for the optocoupler, It was circuit > protection. These components will be installed next to and powered by some > fairly expensive computer components, and upon some research I thought it > would be a good way to make sure that 190VDC doesn't get anywhere near them. > If this was an unnecessary or silly move don't hesitate to correct me. Ah, that makes sense. Inadvertently cooking a $35 Arduino is bad enough, but if it's hooked up to more expensive gear, isolation is a good idea. - Regards, John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
