Path: ...!weretis.net!feeder9.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" Newsgroups: sci.electronics.design Subject: Re: Another design Date: Thu, 9 May 2024 23:11:03 -0400 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 338 Message-ID: References: Injection-Date: Fri, 10 May 2024 03:11:05 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="26007"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:MR4wlNl730vrQ1h3w1o3rWtURw0= sha256:AekbntHV6TwuKd1A5/aifxdL6ijCf/JlSm0Yta28+J8= sha1:KlCqnR9EiSjlaJpPhO4dWcw4aSg= sha256:YZj8Kt8TGJl3/2BKjP3DnXy9hg4TOvzWL0USB1misGI= X-RFC2646: Format=Flowed; Response X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 Bytes: 9387 "Edward Rawde" wrote in message news:v1ho21$4ps$1@nnrp.usenet.blueworldhosting.com... > Now with 9V to 15V input range, direct gate drive and 500mA LED current. > > Startup behaviour is not ideal but maybe that can be fixed if it needs > fixing. > > What's the cheapest op amp I can use for U2 instead of OP07? > > Is there a cheaper comparator instead of LT1719 which will work? > Also the fet is bigger than it needs to ne. > > Is there a better device for D4? Particularly if R4 can be reduced. > > Will it work at all? Except in simulation. > I think I've answered my own question for the current controller but I don't think it's feasible to attempt a discrete comparator on cost grounds. Version 4 SHEET 1 3044 680 WIRE 2032 -272 64 -272 WIRE 2192 -272 2032 -272 WIRE 2480 -272 2192 -272 WIRE 2192 -224 2192 -272 WIRE 2480 -224 2480 -272 WIRE 2336 -176 2256 -176 WIRE 2416 -176 2336 -176 WIRE 976 -128 160 -128 WIRE 1072 -128 1040 -128 WIRE 2032 -128 2032 -272 WIRE 2192 -80 2192 -128 WIRE 2336 -80 2336 -176 WIRE 2336 -80 2192 -80 WIRE 2480 -64 2480 -128 WIRE 2688 -64 2480 -64 WIRE 16 -48 -16 -48 WIRE 64 -48 64 -272 WIRE 64 -48 16 -48 WIRE 96 -48 64 -48 WIRE 240 -48 96 -48 WIRE 336 -48 240 -48 WIRE 448 -48 336 -48 WIRE 464 -48 448 -48 WIRE 528 -48 464 -48 WIRE 608 -48 528 -48 WIRE 672 -48 608 -48 WIRE 784 -48 768 -48 WIRE 816 -48 784 -48 WIRE 864 -48 816 -48 WIRE 992 -48 944 -48 WIRE 1024 -48 992 -48 WIRE 1072 -48 1072 -128 WIRE 1072 -48 1024 -48 WIRE 1264 -48 1072 -48 WIRE 1360 -48 1264 -48 WIRE 240 -16 240 -48 WIRE 336 -16 336 -48 WIRE 2192 -16 2192 -80 WIRE 2480 -16 2480 -64 WIRE 1264 0 1264 -48 WIRE 1360 0 1360 -48 WIRE -16 32 -16 -48 WIRE 2128 32 1872 32 WIRE 2592 32 2544 32 WIRE 448 64 448 -48 WIRE 464 64 464 -48 WIRE 96 80 96 -48 WIRE 160 80 160 -128 WIRE 240 80 240 64 WIRE 240 80 160 80 WIRE 336 80 336 64 WIRE 384 80 336 80 WIRE 416 80 384 80 WIRE 816 80 816 -48 WIRE 992 80 992 -48 WIRE 336 96 336 80 WIRE 336 96 288 96 WIRE 656 96 480 96 WIRE 688 96 688 0 WIRE 688 96 656 96 WIRE 1264 96 1264 64 WIRE 1312 96 1264 96 WIRE 1936 96 1312 96 WIRE 240 112 240 80 WIRE 384 112 240 112 WIRE 416 112 384 112 WIRE 528 112 528 -48 WIRE 608 112 608 -48 WIRE 240 128 240 112 WIRE 336 128 336 96 WIRE 1360 128 1360 80 WIRE 1424 128 1360 128 WIRE 1872 128 1872 32 WIRE 1872 128 1424 128 WIRE 2192 128 2192 80 WIRE 2352 128 2192 128 WIRE 2480 128 2480 80 WIRE 2480 128 2352 128 WIRE 2032 144 2032 -48 WIRE 2128 144 2032 144 WIRE 1360 160 1360 128 WIRE -16 176 -16 112 WIRE 2032 192 2032 144 WIRE 2352 192 2352 128 WIRE 240 240 240 208 WIRE 336 240 336 208 WIRE 336 240 240 240 WIRE 384 240 336 240 WIRE 432 240 432 128 WIRE 432 240 384 240 WIRE 448 240 448 128 WIRE 448 240 432 240 WIRE 464 240 464 128 WIRE 464 240 448 240 WIRE 528 240 528 176 WIRE 528 240 464 240 WIRE 544 240 528 240 WIRE 608 240 608 176 WIRE 608 240 544 240 WIRE 1360 240 1360 224 WIRE 1424 240 1360 240 WIRE 1536 240 1424 240 WIRE 1696 240 1600 240 WIRE 1872 240 1760 240 WIRE 2128 240 2128 144 WIRE 2128 240 2096 240 WIRE 2288 240 2128 240 WIRE 544 272 544 240 WIRE 1264 272 1264 96 WIRE 1360 272 1360 240 WIRE -16 368 -16 256 WIRE 96 368 96 144 WIRE 96 368 -16 368 WIRE 544 368 544 352 WIRE 544 368 96 368 WIRE 816 368 816 144 WIRE 816 368 544 368 WIRE 992 368 992 144 WIRE 992 368 816 368 WIRE 1264 368 1264 352 WIRE 1264 368 992 368 WIRE 1360 368 1360 336 WIRE 1360 368 1264 368 WIRE 1872 368 1872 240 WIRE 1872 368 1360 368 WIRE 2032 368 2032 288 WIRE 2032 368 1872 368 WIRE 2352 368 2352 288 WIRE 2352 368 2032 368 WIRE -16 384 -16 368 WIRE 1936 400 1936 96 WIRE 2592 400 2592 32 WIRE 2592 400 1936 400 WIRE 288 448 288 96 WIRE 992 448 288 448 WIRE 1328 448 1072 448 WIRE 2688 448 2688 -64 WIRE 2688 448 1328 448 FLAG -16 384 0 FLAG 16 -48 in FLAG 784 -48 sw FLAG 1024 -48 out FLAG 1424 128 isense FLAG 1312 96 iref FLAG 1328 448 ifb FLAG 384 80 cmp- FLAG 384 112 cmp+ FLAG 656 96 gate FLAG 384 240 cmpv- FLAG 1424 240 led SYMBOL Comparators\\LT1719 448 32 R0 WINDOW 0 27 27 Left 2 WINDOW 3 -92 6 Left 2 SYMATTR InstName U1 SYMBOL res 320 112 R0 WINDOW 0 41 34 Left 2 WINDOW 3 35 64 Left 2 ========== REMAINDER OF ARTICLE TRUNCATED ==========