Input transformer for Inverted GC

[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?

[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.

[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?

[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

[Peter Daniel]

Or changing the speaker cables.

[5150ed]

Can you explain more on these term?

- PS bypassing on the chip pins
- output Zobel

[sivan_and]

Small 33pf to 100pf between +ve and -ve inputs...

Zobel:Rc network 2.2ohms/2watts and 100Kpf across the output

[analog_sa]

Small 33pf to 100pf between +ve and -ve inputs...

That certainly isn't PS bypassing on the chip pins...

100Kpf

You mean 100KuuF, right?