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Moving-Magnet Head Amp - without RIAA
Moving-Magnet Head Amp - without RIAA
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Old 11th February 2019, 02:04 PM   #101
Hans Polak is online now Hans Polak  Netherlands
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Join Date: Mar 2005
Location: Blaricum
Quote:
Originally Posted by Hans Polak View Post
The 1.58Meg resistor was wrong anyhow.
Gain in your case is (1+3.09/0.1) = 31.9. This figure times 47K gives 1.5Meg.


Hans
Sorry, it is 1.5Meg plus 47K.

When you use these two resistors, you can easily try what difference it makes by connecting the low side of the 47K to Gnd.


Hans
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Old 11th February 2019, 02:28 PM   #102
Hans Polak is online now Hans Polak  Netherlands
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Join Date: Mar 2005
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Quote:
Originally Posted by rsdio View Post
First of all, the synthetic 47 kΩ impedance is definitely supposed to reduce the Johnson noise, compared to a literal 47 kΩ resistor. I haven't done the research or the math to confirm that, but the texts and articles seem to agree.
With the circuit you have in mind, you can expect an improvement in SNR of between 1dBA and 3dBA, depending on the cart you will be using.
When you tell the exact Cart figures in mH and Ohm I can give you a more precise answer.


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