555 EFI: Voltage level conversion

[Bruce Plecan]

-----Original Message-----
From: Don Holtz <daholtz at axionet.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Saturday, January 16, 1999 3:23 PM
Subject: Re: 555 EFI: Voltage level conversion

The diode shifter is a new concept to me, I'd like a picture to look at
please.
          nacelp at bright.net
Bruce


>Here is another idea:
>Since the span of the voltage range that you want to move is smaller (and
>not inverted), you can do the conversion WITHOUT using any kind of active
>stage.  However, it may be necessary to use some buffering at the input or
>output depending on the proceeding section of circuit.
>Try this: use a simple resistive voltage divider to reduce the span of the
>0-5V signal to  a 0-1.666 signal.  Then use a diode level shifter with high
>impedance biasing to shift the range from 0-1.66V up to 3.333-5V.
>There are many variations on this idea possible: use a 3 terminal
>adjustable regulator as a voltage shifter.
>How exact does this conversion need to be?

Just repeatable.  Just so long as it doesn't do a bathtub curve.
\____/     Being able to move the slope up or down might be an
advantage.
Bruce
>
>If you want me to draw up a diagram I will.  And email it to whoever wants.
>Just ask.
>Cheers,
>Don
>>Hmm, would someone who has some EE under their belt e-mail
>>me or respond to:
>>How would someone convert a 0-5v signal to a 3.333-5v signal
>>using a 324?.  Or is this the "killer".
>>Cheers
>>Bruce