![]() Well, if you cannot live without having instant turn after plugging in the PSU, sure. > to limit initial current draw and still allow the device to be powered from the beginning, is this just a concern if we are talking The 150F bank for the HP Bank takes 10 minutes to charge up, only after this can the HP Amp be turned on. > was i overthinking with limiting power draw of the capacitors itself? I think the ian canada module should be around 3,8mOhm in the end but it seems it would be much cheaper to just use 6 of the capacitors i posted (40€ vs 140€) how about the capacitance itself ? is the ian canada module overkill in this regard? (i think the main reason for the huge capacitance is that with increasing capacitance ESR also lowers) If its as easy as you say i would just need to parallel for example these:, what ESR should i aim for? if i use 5 of them the ESR would be around 6,25mOhm I see that ian canada designed these to limit initial current draw and still allow the device to be powered from the beginning, is this just a concern if we are talking about the huge capacitances of 600F ? It's obvious the thread went way beyond that while you were trashing parts and implementations.Ĭlick to expand.hmm interesting, was i overthinking with limiting power draw of the capacitors itself? doesnt it trigger the protection of the power supply since it draws as much current as it can in the beginning (and maybe even the device that is powered cant get enough current as long the capacitors are charged?) The only problem in making more was that Cirrus Logic killed the Wolfson WM8741.ĮDIT: Not to put too fine a point on it, but I was responding to "Easy solution to isolate power and ground on USB," with emphasis on the "Easy." This is supposed to be DIY, btw. The last DACs I built and sold used a fully-differential DAC chip with high-speed, quad-channel isolation, a MOSFET-derived linear-regulated power supply, amorphous core output transformers, and USB synchronous-to-asynchronous conversion down to 192kHz. Yes, there are circuits that can develop even less noise (AMB's Sigma power supplies come to mind), but the LM317 is far from a "pretty noisy regulator." However, you shouldn't throw around terms like "pretty noisy regulator" or "not even correctly applied" if you don't have the evidence to back it up. I'm not the DIY police and am not trying to be harsh. I've been building and selling DACs (and amplifiers) during all that time. The USB standard may have actually been there since 2000, but it takes years to develop follow-on successful chips and applications. ![]() Class 2 USB, you're off by at least 5 years in your "out of date" declaration with regard to audio, maybe even by 10 years in effective applications of high-resolution USB. That's not even discussing the fact that the conditions were specified at 10V as well.Īs for Class 1 vs. Even the most rudimentary power supply circuits in audio have capacitors of 220uf, 470uf, or 1000uf and higher. The reason they used that for measurement conditions is that National was demonstrating how capable the chip is for reducing noise - by just itself or with little else. A 10uf capacitor in electrolytic sizes is so small it's difficult to find in certain brand ranges. The addition of 10uf reduces noise by 15dB. only), and Cadj specified at 10uF is 80 dB (Typ. Note that in the rows for "Ripple Rejection Ratio," Cadj is specified at 0uF is 65 dB (Typ. "Max" is left open for you to achieve higher values with your own circuit implementation. The important point is that the "Max" column is left blank in all the RMS Output Noise and RRR column spaces. ![]() There's a "Min," "Typ," "Max," and "Units" in the column headings, yet several are blank in the highlighted rows. ![]() Note the red-outlined column headings at top and the red-outlined rows near the bottom. ![]()
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