# opamp voltage converter question

Discussion in 'Electronic Basics' started by Tom Del Rosso, Mar 28, 2013.

1. ### Tom Del RossoGuest

A simple level converter. It assumes the +4V supply can sink current, so
why not just have 2 resistors between +4 and +10 and use the opamp as a
buffer?

+10V
|
|
R
|
|
|----------
| |
| |
R |
| |
| |
GND |
|
|
|---- +
+4V -----R------------- - |
| |
| |
|------2R-----|

2. ### Tom Del RossoGuest

I know what you mean. This was just someone's idea of an example but he
should have thought of a better one. I wondered if there was any
justification for using 4 resistors.

3. ### Tom Del RossoGuest

Yes, I know you can't get gain with passive components.

I wasn't suggesting resistors with no opamp. I just wanted to know if the
equivalent.

In the OP I said 'use the opamp as a buffer', so do you mean that it would
have no gain (unity gain) with that approach?

4. ### Tom Del RossoGuest

It was somebody's example of a 'basic opamp circuit' so I wondered if there
was any reason to do that other than making an imaginary circuit.