| 5150ed |
I want more gain from my inverted GC but I do not want to add buffer or tube buffer, want to keep it as pure and simple as I can.
So is 1:4 input transformer works for my inverted GC, if yes what is the input Impedance work for the application? |
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| analog_sa |
Bad idea. The reflected input impedance is likely to overload the source. What's wrong with the chip providing gain?
As much as i like transformers they seldom provide voltage gain for free. |
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| 5150ed |
Dear Analog- Sa
I am using OPA541AM ship and having problem with it gain.
Firstly, I used common inverted GC schematic which have 22X gain and I got problem with high frequency distortion.
So I reduce the gain to 12X and very satisfy with its sound but not its gain coz I use it with step as passive volume.
I want to reduce the gain to 10X and adding one input stage but still want to keep it passive.
Any suggestion? |
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| analog_sa |
The high frequency distortion is probably intermittent oscillation.
What might help:
- PS bypassing on the chip pins
- output Zobel
- small resistor in series with output
- a better grounding scheme |
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| Peter Daniel |
| Or changing the speaker cables. |
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| 5150ed |
Can you explain more on these term?
- PS bypassing on the chip pins
- output Zobel |
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| sivan_and |
Small 33pf to 100pf between +ve and -ve inputs...
Zobel:Rc network 2.2ohms/2watts and 100Kpf across the output |
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| analog_sa |
| quote: | | Small 33pf to 100pf between +ve and -ve inputs... |
That certainly isn't PS bypassing on the chip pins...
You mean 100KuuF, right? :) |
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