Building the Muffsy Phono Preamp PP-2

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This instructable is outdated, visit Muffsy Home Page for Muffsy PP-4.

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    9 Discussions

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    Harold Barrel

    3 years ago

    Hi skrodahl, great project! :-)

    I'd like to ask you one thing: how is important the capacitance tolerance of the capacitors used in this preamp? I refer especially to the polyester capacitors - which are responsible for the equalization if I'm not wrong. Should I choose M (20%), K (10%) or J (5%)? Thanks in advance!

    2 replies
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    skrodahlHarold Barrel

    Reply 3 years ago

    The 47 and 68 nF capacitors form the RIAA filter. I'd choose 5% or better. The other capacitors can be 20%, with no ill effects.

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    joaocandre

    4 years ago on Introduction

    Going to try this as sson as possible. One question though - is it possible to set an adjustable gain through a potentiometer knob?

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    joaocandreskrodahl

    Reply 4 years ago on Introduction

    Thank you for your reply... Indeed that was what I suspected, however I saw that you used switches to vary the gain and it got me wondering. Maybe if I find a way to limit the pot's range to the same values you set with the switches (just wondering, probably going to try the PCB as is first)

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    dmilesson

    4 years ago on Introduction

    Snyggt jobbat Håvard :) Göran låvorda den, men själv har jag lämnat vinylspelare bakom mig.

    1 reply