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Crazy idea for a powered sub
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<blockquote data-quote="John Roberts" data-source="post: 48786" data-attributes="member: 126"><p>Re: Crazy idea for a powered sub</p><p></p><p></p><p></p><p>Since they manage to put circuit boards on rockets and send them into space, I suspect that vibration is manageable, with adequate accommodation. I doubt "internal pressure" alone would impact FR4 while a span of PCB with massive components, insufficiently secured and allowed to flex sympathetically with sound vibrations could fatigue and fail over time. </p><p></p><p>This is not a new concept for designers. Regarding bass guitar amps, years ago when we did a reliability review (at my old day job) of all products in the context of extending our warranty, I don't recall the instrument amps having any higher or lower historical failure experience. Over decades in a given business the design engineers learn from failures and adjust their design practices to deliver required reliability. It is no secret that the orientation and mounting of tubes inside tube amps accounts for sonic interaction. This used to be much worse in the bad really old days. I have the remains of an old Western Electric (32C?) amp, that had the gain stage tubes mounted inside a sealed padded compartment and balanced on a knife edge, actually two needle screw points. This was all of a 10W or so amp, but that was a bunch of power for the time. </p><p></p><p>Powered boxes are actually a pretty mature technology, while extending the frequency range lower, and output level louder will increase the forces acting on the components. For active electronics SMD is more robust than old TH technology and more tolerant of vibration stresses. Relatively massive passive crossover components have always been an issue about securing reliably and accounting for unintended resonances with how the PCBs are secured. </p><p></p><p>JR</p><p></p><p>PS I don't doubt that Ivan experienced problems, only that such issues should be manageable in dedicated designs. I can imagine it not being worth the trouble to pursue for low-modest volumes.</p></blockquote><p></p>
[QUOTE="John Roberts, post: 48786, member: 126"] Re: Crazy idea for a powered sub Since they manage to put circuit boards on rockets and send them into space, I suspect that vibration is manageable, with adequate accommodation. I doubt "internal pressure" alone would impact FR4 while a span of PCB with massive components, insufficiently secured and allowed to flex sympathetically with sound vibrations could fatigue and fail over time. This is not a new concept for designers. Regarding bass guitar amps, years ago when we did a reliability review (at my old day job) of all products in the context of extending our warranty, I don't recall the instrument amps having any higher or lower historical failure experience. Over decades in a given business the design engineers learn from failures and adjust their design practices to deliver required reliability. It is no secret that the orientation and mounting of tubes inside tube amps accounts for sonic interaction. This used to be much worse in the bad really old days. I have the remains of an old Western Electric (32C?) amp, that had the gain stage tubes mounted inside a sealed padded compartment and balanced on a knife edge, actually two needle screw points. This was all of a 10W or so amp, but that was a bunch of power for the time. Powered boxes are actually a pretty mature technology, while extending the frequency range lower, and output level louder will increase the forces acting on the components. For active electronics SMD is more robust than old TH technology and more tolerant of vibration stresses. Relatively massive passive crossover components have always been an issue about securing reliably and accounting for unintended resonances with how the PCBs are secured. JR PS I don't doubt that Ivan experienced problems, only that such issues should be manageable in dedicated designs. I can imagine it not being worth the trouble to pursue for low-modest volumes. [/QUOTE]
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