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Hi,I could always add another op-amp gain stage. However, is there any way to increase the gain of the current design, maybe by changing some resistor values? Would this result in a more noisy circuit, since so much amplification is being "squeezed out" from a single opamp? I'm hesitant to experiment with this circuit, as I have no idea which resistors set the RIAA curve performance, and which ones do other things.
Thanks,
Saurav
Follow Ups:
hello,the gain is pretty high as is...are you going to build the MC section as well? the MM section should be sufficient enough for your 10x4...though a shunted volume control (think sweet whispers) at the output of the MC may allow for some flexibility with regards to future cart changes and/or matching with your passive so you don't end up listening at 9 or 5 o' clock with the volume control.
regards,
chiggy
Nope, this is MM only, for now. That way I don't have to find that huge choke either :) It looks like I should be fine, so I ordered the parts, now let's see how it turns out.On a side note, I replaced the opamps in my CD player with the OPAs - it sounds pretty sweet.
That preamp is already higher than normal gain.Kurt
Thanks. I wasn't sure what its gain numbers were, and I don't really know how much I will need, so I was exploring the possibility.Dynavector 10x4, 2.5mV output
ASL Waves, 500mV input sensitivityHow much gain do I need to be able to run the autoformer reasonably below 1:1? If I assume I need 2V output from my phono stage (since my CD player works fine), that's a gain of around 800. I thought I saw a post from Thorsten saying it had a gain of 120, which is why I was concerned. However, 800 is less than 30 dB, and his web page says that 45 - 50 dB gain was one of the design requirements, so I'm probably fine.
Hey Saurav:Both Chiggy and I have built this phono stage. We differed from Thorsten's parts suggestions to get high quality parts that are more easily sourced here in the US. Let me tell you that I used a Radio Shack Little Rat before this and the El Cheapo just blows it away. Send me an email if you want to discuss the project. I boxed mine and added a battery monitor circuit and charging circuit to make it more finished.
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