Re: [CAD_CAM_EDM_DRO] encoder testing (tester)

dk1machine wrote:

> Does anyone know of a design for a simple 5v TTL quadrature encoder
> tester? Perhaps using LED's to show the switching of each channel. One
> more wish would be that it's battey powered so it could go to the
> machine for the test. Very clunky to use a scope for this purpose, and
> catching that marker pulse is a trick.

Its pretty simple. You could use a 7805 5-Volt regulator to step down
a 9 V battery, and power the circuit and encoder. A 74LS04 inverter
could drive the LEDs without loading the encoder output. A series
resistor on each LED is needed to limit current, unless you use LEDs
with built-in resistors.

Jon