How to amplify the current from Voltage divider?

Screech said:

The current coming out of my 600k voltage divider is vary low.
This voltage is to be read by a microcontroller(picaxe)
The problem is that the microcontroller can only read voltages with 10k impedience with accuracy.
So,I nead to increase the current, but not the voltage.

Beaniebots told me Op-amps can do this.
I didn't think they amplify current.

Do they amplify voltage and curent, and then do I run another voltage divider after the Op-Amp? (I know nothing about OP-Amps)

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Screech said:

so, its a voltage follower I need?


Here's what I found:

Voltage Follower:

The voltage follower, also called a buffer, provides a high input impedance, a low output impedance, and unity gain. As the input voltage changes, the output and inverting input will change by an equal amount.
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Do I wire it up exactly as the pic on the bottom right.
It neads +5 and -5 volts supply to it, yeah?

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If you check my analogue PIC tutorial you will see that I use an external 2.5V reference, so the opamp only has to output between 0V and 2.5V, this prevents any potential problems! - it also makes the conversion more accurate and repeatable.

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Screech said:

Nigel said

If you check my analogue PIC tutorial you will see that I use an external 2.5V reference, so the opamp only has to output between 0V and 2.5V, this prevents any potential problems! - it also makes the conversion more accurate and repeatable.

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I saw your tutorial.
but, are you saying you are using the 2.5 volt reference as the possitive supply?
What about the minus supply?
:shock:

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No, I'm saying use +/-5V supplies, but use a 2.5V reference on the PIC, this way the PIC input is from 0-2.5V, rather than 0-5V, which is well within the range of almost any opamp.

Click to expand...