|Chip Amps Amplifiers based on integrated circuits|
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|20th January 2007, 09:30 PM||#3|
Join Date: Jul 2004
Location: Scottish Borders
How have you assembled your chipamp?
inverting, non-inverting, DC block on NFB, DC block on input, Zin, NFB resistor values,
All the above will affect the DC output offset and they interact with what source impedance/resistance the amplifier input sees.
If you want to use a passive attenuator then Zin>=5times the attenuator resistance.
attenuator resistance >=5times the source resistance.
5times is the minimum, but 10times is better.
A disadvantage of using high attenuator resistance is loss of treble from the amplifier. Careful selection of component values can avoid many of the problems.
regards Andrew T.
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