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DIY & Tutorials
DIY For Audio
Simple multi-channel volume control sought
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<blockquote data-quote="gbyleveldt" data-source="post: 17812" data-attributes="member: 122"><p>The CPU schem was maybe quick, but the software is the time consuming part ;D Most of it has been done though. The schem will probably change as I start laying out the board though.</p><p></p><p>The ULN is used to drive the relays on the input selector board. They much cheaper and compact than using transistors.</p><p></p><p>I'm still thinking I might need some IO though. </p><p></p><p>The reason I'm carrying on about output muting is that on my current pre-amp, using the PGA2310, I get a "squealing" noise when the power fails. It is fine if I switch power off using the front panel, but with all the power failures of late I need something that'll recover elegantly. I'm thinking that maybe relays won't be such a bad idea. We only talking another 3 DPDT relays and they not <em>that </em> expensive.</p></blockquote><p></p>
[QUOTE="gbyleveldt, post: 17812, member: 122"] The CPU schem was maybe quick, but the software is the time consuming part ;D Most of it has been done though. The schem will probably change as I start laying out the board though. The ULN is used to drive the relays on the input selector board. They much cheaper and compact than using transistors. I'm still thinking I might need some IO though. The reason I'm carrying on about output muting is that on my current pre-amp, using the PGA2310, I get a "squealing" noise when the power fails. It is fine if I switch power off using the front panel, but with all the power failures of late I need something that'll recover elegantly. I'm thinking that maybe relays won't be such a bad idea. We only talking another 3 DPDT relays and they not [i]that [/i] expensive. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Simple multi-channel volume control sought
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