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DIY & Tutorials
DIY For Audio
My First Ever Speaker Project
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<blockquote data-quote="d0dja" data-source="post: 98479" data-attributes="member: 2244"><p>The power supply itself is sealed. It's probably just a PoS, just need to get a better one. Also need to get a decent multimeter (looks like I can get something OK for about R900... but it's been a very expensive last few months).</p><p></p><p>Across the input to the jig I stuck a LM2940 with a (AFAIR) 470nF on input and 22MF on output (think these are just for stability). The amp kit itself has a 1000MF and 100nF caps across Vin (diagram of the kit is here http://www.vellemanusa.com/downloads/0/illustrated/illustrated_assembly_manual_k4001.pdf). </p><p></p><p>But in calibration test it's pretty clean - has a bit off offset between channels of (again AFAIR) .4dB, but variation of no more than a fraction of that.</p><p></p><p>I weighed a couple of bits of metal using a friend's very sensitve scale (that he uses for his...er...produce business) to use for an added-mass test tonight to get T-S, because building a test enclosure seems like a lot more work. Is the added mass test accurate, though?</p><p></p><p>~R</p></blockquote><p></p>
[QUOTE="d0dja, post: 98479, member: 2244"] The power supply itself is sealed. It's probably just a PoS, just need to get a better one. Also need to get a decent multimeter (looks like I can get something OK for about R900... but it's been a very expensive last few months). Across the input to the jig I stuck a LM2940 with a (AFAIR) 470nF on input and 22MF on output (think these are just for stability). The amp kit itself has a 1000MF and 100nF caps across Vin (diagram of the kit is here http://www.vellemanusa.com/downloads/0/illustrated/illustrated_assembly_manual_k4001.pdf). But in calibration test it's pretty clean - has a bit off offset between channels of (again AFAIR) .4dB, but variation of no more than a fraction of that. I weighed a couple of bits of metal using a friend's very sensitve scale (that he uses for his...er...produce business) to use for an added-mass test tonight to get T-S, because building a test enclosure seems like a lot more work. Is the added mass test accurate, though? ~R [/QUOTE]
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DIY & Tutorials
DIY For Audio
My First Ever Speaker Project
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