Re: Differential to TTL

At the risk of serious abuse from electrical know how members, and
the risk of your MPG and electronics.

Lift the ground 2.5v (between 2, 1k resisters connected between gnd
and 5v)

use one of the outputs A or B through a 100 to 250 ohm resistor (to
limit current from and to the MPG)

a diode to the 5 volt (after the above resistor) to limit the 7 volts
(3.5 + 3.5) into the monitoring circuit. (I assume the A and B signal
swing -3.5 to +3.5 ?)

Unfortunately the electrical expert who works with me is not here the
check this (but saves me from his further verbal abuse :-) ).

Martin

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@...> wrote:
>
> roboticscnc wrote:
> > Hi Group,
> > I have a differential encoder ( MPG ) that I need to convert to
single
> > ended. I'm using the 0v and A, but the high is only 3.25 volts. I
seem
> > to remember that you can use a resistor between A & -A but not
sure
> > how to connect the rest or the circuit. I would prefer not to use
> > another IC if possible. Maybe a coupling capacitor ?
> You may be able to put two resistors of about 1 K Ohm between A
> and +5V and B and +5V and get a higher output for the "1" state.
> If that doesn't work, then you will need a differential
> receiver. The 26LS32 will work.
>
> Putting a resistor between A and A- will lower the voltage
> output of each half of the differential driver.
>
> Jon
>