On Monday 23 March 2020 00:32:56 andrew beck wrote:
> Hey guys.
>
> I have a 12 volt mpg
>
> I want to connect it to the 7i76 board. do you know if I can connect
> it straight up. I think that the mesa boards only want 5 v and I am
> not sure how to connect up my 12 volt mpg
>
> https://drive.google.com/file/d/1uOF2y7KFSchXLhQ3s79GSB1x_WZieQ5l/view
>?usp=sharing
>
You can probably supply the 12 volts by way of the field power on the
7i76, its what I'm using but any encoder inputs are going to be 5 volts
maximum because they all exist on the parent card, such as a 5i25. I
believe the 7i76 is functioning as a BoB in this case
One could use a small 4.7 volt Zener diode to ground as a voltage
limiter. With a 10k isolation R in series with each of the A/B/Z lines
from the MPG, and a 4.7 volt Zener from the 7i76 input to ground you
should not have enough heat to detect it. And the Zener which in fact
might be an avalanch mode device since that is also the changeover
voltage for Zener diodes. A true Zener mode diode is stable and below
4.7 volts, whereas the avalanch mode device fades downward over time &
power dissipation. With this low a power, it should last 50+ years.
like this for each signal line from the MPG:
10k 1/4 watt R
MPG-A--/\/\/\/\/\/\--x----7i76-input
| zener
x----|<--- ground
repeat for B,Z
> I did a bunch of searches on the forum but couldn't get a definite
> answer.
>
> I tried to attach a photo but it bounced back. so here is a link
>
> regards
>
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