Joe Mann wrote:

> Hi Martin,

Hi Joe

>
> I believe the following will satisfy your requirements.
>
> On the first XOR one input is tied high and its other input is fed the
> original square wave.  The second XOR has one input tied low and its other
> input is fed the original square wave.
>
> The result is two outputs, one of which is a replica of the original input,
> the other the inverse of the original input.
>
> Inputs    Outputs
> A   B       Y
>
> L   L       L     <-- input A held low
> L   H       H     <-- input B fed with sq wave
>
> H   L       H     <-- input A held high
> H   H       L     <-- input B fed with sq wave
>
> The 74AC86 quad XOR has propagation delays and state changes 11 nanoseconds
> or less for a wide temperature range.  Since one would probably use a pair
> of gates from the same quad package these tolerances would probably be
> tighter in practice.
>
> Generate the input from a PIC and off you go.
>
> Joe, K9HDE
>
> PS  If Denny Esterline's comments are correct concerning required 'off'
> times, then the above may be true but of no use to you at this time.  8-)
>
> PPS  Are you sure about an inverter not being suitable?

Yes. If you look at diagram you drew below, the upper output has maybe
30% on-time [high] and the second output has about 70% on-time. This
would cause a flux imbalance in the magnetic core, and it would make the
transistors blow up. I appreciate your help though.

>
> Input    Output
> A          Y
>
> L          H
> H          L
>
> The original signal is the first output, the output of the inverter is the
> second.
>
>  ______---______---
>  ------___------___
>
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Martin Klingensmith
http://infoarchive.net/
http://nnytech.net/

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