arefeidi
Joined: 06 Sep 2007
Posts: 80
Helped: 3
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 20 Jan 2008 19:42 Low Impedance Voltage follower |
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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!
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humber
Joined: 21 Mar 2006
Posts: 56
Helped: 7
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20 Jan 2008 20:38 Re: Low Impedance Voltage follower |
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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
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