Re: How good a "sine" wave to drive a selsyn/synchro?


"jtaylor" <jtaylor@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:OuR_e.13362$p5.1689@xxxxxxxxxxxxxxx!nnrp1.uunet.ca...
> The simplest way to get this pair of devices working in a non-400hz
3-phase
> environment seems to be to program a pic to generate three-phase and
amplify
> the output. If I have three pins per phase and run each through a
resistor
> of some calculated value I can make a psuedo-sinewave. Is this likely to
> have any issues because it's not a true sinewave? This is a hobby-level
> application, so good enough will be good enough....
>
>

If you have three pins per phase then you have nine pins. If you make a
johnson counter for 6 of the pins and take a weighted sum through the
resistors then use the seventh bit for polarity then you get something or
another with two bits to spare. To get your three phases you offset the
summing resistors for each phase.

DNA


.

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