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DIY For Audio
PALADIN: Pre-amplifier control unit. Do you want to join in?
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<blockquote data-quote="d0dja" data-source="post: 547736" data-attributes="member: 2244"><p>Was pulling apart the amp last night to start fabricating new brackets for the new boards. So quickly did some more measurements of the input selector board with the AMPS pot disconnected... and interestingly it appears that the pot is the main culprit in the cross-talk.</p><p></p><p>If I stuck ~2V into one L input, I'd get a constant ~20mV at the same freq on the R channel when the input was "unselected". Constant across the frequency range (whereas the crosstalk before was closely coupled to frequency). I guess that 20mV is because the lines are floating when not selected.</p><p></p><p>So I guess the pot may have a fair bit of capacitance between the resistive discs?</p><p></p><p>This weekend I should finish up the rebuild and check how the Paladin board does. If the pot is the culprit, then the R2R ladder should be the solution!</p><p></p><p>(not using any complicated software... Old Skool ... signal generator, old oscilloscope, eyeballs and an Excel spreadsheet).</p></blockquote><p></p>
[QUOTE="d0dja, post: 547736, member: 2244"] Was pulling apart the amp last night to start fabricating new brackets for the new boards. So quickly did some more measurements of the input selector board with the AMPS pot disconnected... and interestingly it appears that the pot is the main culprit in the cross-talk. If I stuck ~2V into one L input, I'd get a constant ~20mV at the same freq on the R channel when the input was "unselected". Constant across the frequency range (whereas the crosstalk before was closely coupled to frequency). I guess that 20mV is because the lines are floating when not selected. So I guess the pot may have a fair bit of capacitance between the resistive discs? This weekend I should finish up the rebuild and check how the Paladin board does. If the pot is the culprit, then the R2R ladder should be the solution! (not using any complicated software... Old Skool ... signal generator, old oscilloscope, eyeballs and an Excel spreadsheet). [/QUOTE]
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DIY & Tutorials
DIY For Audio
PALADIN: Pre-amplifier control unit. Do you want to join in?
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