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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: "Best op-amp for analogue filter?" posted by lovekylie on October 12, 2006 at 15:41:04:
Where in the datasheet does it specify using a 10R series resistor for an RC filter?That's my experience, which includes design of high speed instrumentation and hi-rel equipment.
It somewhat mitigates the bad layout of power rails. It avoids any reaction from one amp to the one that follows it in a processing chain.
By using the resistors, the amp will "see" a voltage source (the caps) with low impedance (say 0.1ohm), and will largely "ignorate" (one hundredth!) the second voltage source, which bleeds through the 10 ohm resistor. That's good, since the second voltage source carries a variable current (audio) through its own impedance (resistive and inductive).
As an exercize, calculate the series inductance of the power line that would trigger oscillation in a chain of 3 common collectors powered by this power line, undecoupled.
You will see it's amazingly low in many cases.
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Follow Ups
- Experience... - Jacques 01:35:27 10/13/06 (1)
- Re: Experience... - lovekylie 09:18:41 10/14/06 (0)
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