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Circlotron 26th January 2005 12:38 PM

Chip amp distortion with high impedance resistive load.
I'm thinking about using an LM3875 or perhaps an LM3886 in a project; not as a power amplifier but as a high voltage opamp, driving a load somewhere about 500-1000 ohms. Now the datasheet will tell you how much distortion is produced when driving a 4 ohm or 8 ohm load to however many watts, but does anyone know the likely distortion at say 50v peak to peak with 1k resistive load? I would imagine the figure would be better but I am not sure.

I particularly want to use one of these IC's, not a fancy HV opamp.

peranders 26th January 2005 12:56 PM

Note that you can't get 50 V peak, only 40 V!

I'll guess it would work alright but what are you planning to use it for really, some weird class A? :idea: :D

Circlotron 26th January 2005 01:39 PM

1. That's peak-to-peak.
2. :devilr:

Upupa Epops 26th January 2005 02:02 PM

Practicaly every amps have by this condition lower distortion, 2 - 10 times, then by normal " heavy " load.

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