8pin voltage convertor

[mackrackit]

What about using an op amp?

[Charles Linquis]

An op amp will do it. But consider the fact that, unless you have a negative voltage power supply available (so that the op-amp is powered by + and - voltages), you can't amplify a voltage very near "0". If you can tolerate a little non-linearity near 0V, and you only have a positive supply available (say +5V), you can use a rail-to-rail input/rail-to-rail output type. A good place to look is -

http://www.national.com/cat/index.cgi?i=i//11

[mackrackit]

Good point Charles.

I have been using a LM358 for thermo couplers.
single supply: 3V to 32V
dual supplies: ±1.5V to ±16V

[RussMartin]

Could you use a 12F683, vary the duty cycle of the PWM output according to the input voltage, and smooth it?

For the op-amp approach, you might see if the TLC271 would work well enough in a single-ended application.