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DIY For Audio
Phono Stage - Transformer interference
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<blockquote data-quote="Steerpike" data-source="post: 89733" data-attributes="member: 807"><p>MC inputs have a sensitivity of around 100uV - which is a very tiny signal level - it's very normal that they will pick up buzz unless very careful attention is paid to shielding & screening.</p><p></p><p>The circuit board should be in a metal (steel, not aluminium) box to keep out any extraneous fields.</p><p></p><p>A smaller transformer will also probably be helpful - for a phono pre amp you would need only a tiny transformer 5VA to 10VA or so.</p></blockquote><p></p>
[QUOTE="Steerpike, post: 89733, member: 807"] MC inputs have a sensitivity of around 100uV - which is a very tiny signal level - it's very normal that they will pick up buzz unless very careful attention is paid to shielding & screening. The circuit board should be in a metal (steel, not aluminium) box to keep out any extraneous fields. A smaller transformer will also probably be helpful - for a phono pre amp you would need only a tiny transformer 5VA to 10VA or so. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Phono Stage - Transformer interference
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