Low Impedance Voltage follower

[arefeidi]

Hi,

I've got a big problem: I'd like to connect a DSP-board (input impedance 120 Ohms) to the output of a lowpass-filter (output impedance 4.7 kOhm).

So, to not load the source in such a heavy way I need to build a voltage follower with a low output impedance. Though, I only have some u741 and TL071 OP Amps which (as I think) have to much output impedance.

Does anyone of you have an idea which OP Amp with low ouptut impedance (should be well below 30 Ohms I'd say) I could use or does anyone have another idea how to solve the problem?


thanks alot for any answer!

 

[humber]

When wired as a follower, feedback will reduce the op-amp's open-loop output impedance. Without delving in to the maths, it is most likely that the input and output of impedance of a TL071 will be sufficient for most applications.

If there are some special requirements, then it would be necessary to first know of them.

Humber