At 10:29 AM 8/29/01 -0500, you wrote:
>
>It would be simple to add a little logic circuit to prevent both inputs from
>going high at the same time.  Digikey sells a 2-input Xor gate for US$0.35,
>two of them would do the trick.  $0.70 might sound cheap to you rocket
>scientists, but I build whole PC boards that cost less than that.   Can
>anybody think of a simple, cheap way to implement this, say using diode
>logic or a To-92 transistor?  Kind of a design challenge.

In essence you want to force one low when the opposite one goes high.
Maybe you could use a transistor and base resistor.

Without more information on your circuit (especially the motor voltage and
current- I'd assume it is not the same as the PIC power supply), it's really
hard to guess what you're up to.

If you post your circuit, I'm sure we can make suggestions.

Best regards,


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