On 12/03/2017 06:02 PM, Gene Heskett wrote:
But this teeny little board doesn't want to work unless I
can figure out where the input bias R's are, and excise
then. This board has a 120 ohm a/b termination R that I
can measure from the A terminal to the B terminal. But
thats one hell of a load on the encoder, which surprises
me somewhat considering it claims to draw 140 ma.
Disconnect the encoder from this board, and scope the
leads from the encoder and I am getting a nice, with
spikes, nominally ground to 3.75 volts swing on each wire.
Well, you can do AC termination, just put a 0.1uF cap in
series with the 120 Ohm resistor between the true and
complement output. That should get rid of the spikes
without excessive DC load on the driver.
Jon
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