Re: [CAD_CAM_EDM_DRO] Sine wave to TTL conversion for DRO

In a message dated 7/14/2003 10:47:08 AM Central Standard Time,
b.smith@... writes:

> Has anyone any experiance of converting sine wave outputs from a DRO
> scale output into TTL pluses for quadrature decoding? Im thinking
> of using a Schmidt trigger inverter chip to do this any advice
> comments would be handy

Barry: An LM339 quad comparator (14-pin DIP) will do this wonderfully (with
the appropriate accomp. few resistors, etc.) With that IC (less than a
$buck), you can SET the thresholds so that the logic-level transitions are whatever
exact voltages you desire.

Jan Rowland


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