ang728 Posted November 1, 2023 Report Share Posted November 1, 2023 18 minutes ago, Pars said: A1943/C5200 Same Here,also uses MJL21193/94 on other builds Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted November 1, 2023 Report Share Posted November 1, 2023 Thanks guys. That is a good steer to transistors that I can buy! What about the driver transistors? I have a load of MJE340/350 that might fit the bill. Also very linear with flat beta vs Ic? Any thoughts? 1 Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted November 5, 2023 Report Share Posted November 5, 2023 OK - I've been through the whole thread trying to answer the question of why tantalum bead caps for the four 47u (C7, C9, C13, C15) and the two 10u caps (C3, C16)? I failed in the quest. So - what is the reason for using tantalum bead rather than aluminium electrolytic in those locations? Quote Link to comment Share on other sites More sharing options...
jamesmking Posted November 5, 2023 Report Share Posted November 5, 2023 (edited) 10 minutes ago, Craig Sawyers said: OK - I've been through the whole thread trying to answer the question of why tantalum bead caps for the four 47u (C7, C9, C13, C15) and the two 10u caps (C3, C16)? I failed in the quest. So - what is the reason for using tantalum bead rather than aluminium electrolytic in those locations? I think tants typically will have lower effective series resistance at high frequencies than electros, and in general tants esr decreases with increasing frequency unlike electrolytics. https://www.doeeet.com/content/eee-components/passives/why-low-esr-matters-in-capacitor-design/ Edited November 5, 2023 by jamesmking Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted November 5, 2023 Report Share Posted November 5, 2023 Time to power up my HP 4275A LCR meter https://www.testequipmenthq.com/datasheets/Keysight-4275A-Datasheet.pdf and put this to the test 😉 Quote Link to comment Share on other sites More sharing options...
jamesmking Posted November 5, 2023 Report Share Posted November 5, 2023 (edited) 3 hours ago, Craig Sawyers said: Time to power up my HP 4275A LCR meter https://www.testequipmenthq.com/datasheets/Keysight-4275A-Datasheet.pdf and put this to the test 😉 I just have a Mastech MS5308 Lcr-Meter. kemet 35v 47uf tantalum esr 100hz 0.4ohm 120hz 0.4ohm 1khz 0.22ohm 10khz 0.19ohm 100khz 0.12ohm panasonic 47uf 63V electrolytic esr 100hz 1.1ohm 120hz 1.0ohm 1khz 0.39ohm 10khz 0.33ohm 100khz 0.30ohm chinesium "suntan" brand electrolytic 47uf 105C 25V esr 100hz 4.8ohm 120hz 4.4ohm 1khz 1.75ohm 10khz 1.41ohm 100khz 1.26ohm so for this tiny sample size (and not the same voltage rating) tants have lower esr throughout the range I can measure. so not enough data points, resolution, sample size or frequency range etc. to make any real conclusions but maybe enough to start a electro vs tant thread... Edited November 5, 2023 by jamesmking Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted November 5, 2023 Report Share Posted November 5, 2023 On the basis of your measurements for PSU applications perhaps they have the edge. But for audio signal use they are absolutely lousy. It is latish here in the UK so I'm not going to haul my HP gear out. But I'll try some stuff tomorrow. Quote Link to comment Share on other sites More sharing options...
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