Re: [CAD_CAM_EDM_DRO] Re: Pulsing circut

On Tuesday 17 February 2004 02:10 pm, caudlet wrote:

> build an AND gate so that the limit switch stops the step pulses. a
> simple transistor and two diodes with both anodes tied to the base of
> the transistor through 4.7K limit resistors will work with the logic
> so that the collector goes low only when both of the cathodes are
> high. Either cathode low means no steps. The limit then is
> connected to one cathode so that on activation it goes low.

Why build one when you can get several gates in a simple chip package?

> A really good wide range pulse generator using a single pot for
> frequency can be built using a CMOS 4060 PLL chip.

The 4060 is a counter chip, are you perhaps thinking of the 4046?

> I have an old schematic somewhere that uses a joystick to control a two axis
> pulsing engine with a wide pulse range. I can dig it out if you are
> interested.

I would be interested.