|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.
Sent from my desktop computer using a keyboard
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