Re: analog +/- 10V into step/direction?

Tod and Irfan,

I'd suggest a MAX232 Receiver / Driver chip. These are typically used
in RS232 applications as interface translators going from TTL/CMOS
levels to +/- 10V and back the other way, it can handle +/- 30V on
the receive line. This chip fits both your needs and only costs a few
bucks. Have a look at http://pdfserv.maxim-ic.com/en/ds/MAX220-
MAX249.pdf There's enough info there to get you going. You need 5 1uF
electrolytic or tantalum capacitors for the MAX232 and a 5V regulated
power supply. The catch is that the signals are inverted in both
transmit and receive lines so a logic hi (1) procudes -10V in
transmit line, +10V on the recieve line procudes logic lo (0). This
may not matter if your CNC software can be instructed to invert the
signals, if not you should use an inverter IC to do this.

Cheers
Peter.



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "irfan_younis"
<irfan_younis@y...> wrote:

> Dear Friends,
> I would like to convert analog +/- 10V into step/direction, any one
> have experience in this type of conversion?
>
> Best regards,
>
> Irfan