Re: 0-5vdc converted to 0-10vdc on the cheap

> The 741 needs + and - supply while the 324 series can run from +5

to

> + 30 VDC supply. You only need about .6 volt more supply than the
> output so the +12 would be perfect. Since gain is not dependent on
> supply voltage then even unregulated DC will work.
>
> Tom C
> Old analog/digital engineer

True the 741 needs the + and - voltage to work, but the reason it
might work in this case is that the Forest Mimms book is based on
that chip. Nothing like building a circuit from the book in front
of you and all the parts are on the shelves as well.

I think I buy the LM324 and LM358 for probably 90% of my op-amp use.

Also depending on the need to get to a true zero, I preferr to be
able to see -.1mV to know it is really on zero and not -3 volts and
read zero.


Another benifit with your approach is that with the quad, you can
make a second gain stage for use with a panel meter. If you have a
panel meter of 0-100mV or 0-2 volts or some such, you can adjust the
gain so at 5 volts input, you have an output that is linear at a 2:1
so it outputs 10 volts and another that is outputing 2 volts for you
meter. Unlike a voltage divider the op-amp draws very very little
from the source.

Dave