In message <cabbxvhvnsaxbx5uorjtqesttd50yedyavkgxh52bpspuayt...@mail.gmail.com> , Chris Albertson writes:
>One question: How does one avoid using electrolytic caps if you need >(say) 1,000uF or even 100uF. Those would be some mighty big film caps. One detail, often overlooked, is that electrolytics seldom are dimensioned very precisely, mostly because they do come with such big capacity but also because them have very big tolerances, +/- 50% is not uncommon. Another effect that causes overdimensioning is that they are not very good capacitors, in particular at higher frequency. I have in a couple of instances replaced electrolytics with film-caps and gotten away with less than 1% of the original capacitance by doing a bit of calculations and measurements on the actual circuit. In one case, an audio circuit had 1000uF for a handful of opamps, using 4.7uF of good film capacitors instead reduced THD by 80%. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
