Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Thu, 2 Jul 2020 14:21:41 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 062LD4ni031242; Thu, 2 Jul 2020 17:13:24 -0400 Received: from outgoing-exchange-1.mit.edu (OUTGOING-EXCHANGE-1.MIT.EDU [18.9.28.15]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 062LD3ex031239 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Thu, 2 Jul 2020 17:13:03 -0400 Received: from w92exedge3.exchange.mit.edu (W92EXEDGE3.EXCHANGE.MIT.EDU [18.7.73.15]) by outgoing-exchange-1.mit.edu (8.14.7/8.12.4) with ESMTP id 062LBwBf031435 for ; Thu, 2 Jul 2020 17:12:04 -0400 Received: from oc11expo22.exchange.mit.edu (18.9.4.84) by w92exedge3.exchange.mit.edu (18.7.73.15) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Thu, 2 Jul 2020 17:12:18 -0400 Received: from oc11exhyb4.exchange.mit.edu (18.9.1.100) by oc11expo22.exchange.mit.edu (18.9.4.84) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Thu, 2 Jul 2020 17:12:58 -0400 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (104.47.55.100) by oc11exhyb4.exchange.mit.edu (18.9.1.100) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Thu, 2 Jul 2020 17:12:58 -0400 Received: from DM5PR20CA0019.namprd20.prod.outlook.com (2603:10b6:3:93::29) by DM5PR01MB2732.prod.exchangelabs.com (2603:10b6:3:f2::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3153.23; Thu, 2 Jul 2020 21:12:57 +0000 Received: from DM3NAM03FT013.eop-NAM03.prod.protection.outlook.com (2603:10b6:3:93:cafe::7e) by DM5PR20CA0019.outlook.office365.com (2603:10b6:3:93::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3153.23 via Frontend Transport; Thu, 2 Jul 2020 21:12:57 +0000 Received: from mail-wm1-f47.google.com (209.85.128.47) by DM3NAM03FT013.mail.protection.outlook.com (10.152.82.79) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3153.24 via Frontend Transport; Thu, 2 Jul 2020 21:12:57 +0000 Received: by mail-wm1-f47.google.com with SMTP id 22so28994046wmg.1 for ; Thu, 02 Jul 2020 14:12:57 -0700 (PDT) From: Denny Esterline To: Microcontroller discussion list - Public. Sender: "piclist-bounces@mit.edu" Date: Thu, 2 Jul 2020 14:12:44 -0700 Subject: Re: [EE] Specifying the right electrolytic capacitors for long (10 year) operating life? Thread-Topic: [EE] Specifying the right electrolytic capacitors for long (10 year) operating life? Thread-Index: AdZQtsfbGAmxmlwnTGenVpFdmUVGEQ== Message-ID: References: List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of gmail.com designates 209.85.128.47 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.128.47; helo=mail-wm1-f47.google.com; dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=UYFLiI2Dvyhi4o8Ll7jTFkw0df4HfCfBOnNIRGOgYwM=; b=A+d65T+lIh0oZ3a1MvrSD+8tfneoPaDPxBe8G3tAxg9UMbcTZDJDQIfAMlXPLrOKJt d6zNLz6nw3sUN/k9WR4nt4uEDIRy4CHZPIMStCbLHzKxg1s5u+4ycrlLnCZtcPvTyzWz PW7s8fzH9PLDJQGKslq0FX4DSddpsjHolQZDtsmkfd+QIWwppjF68q8sIjP+7LqSAUeH ikaXKWwFi4HkvF8yjuQMegmnzCnBwMjTgm3nthfPrJ/QVjZdpOqjsx5gyqM0kw21hvW3 IdhW9BNCa2lk5g5OLVOIhUlptHjOCYZh5/+qju4tbFgMI4mMoktJ6trWsIPNuPwqmTQE H6EA== authentication-results: spf=pass (sender IP is 209.85.128.47) smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified) header.d=gmail.com; mit.edu; dmarc=pass action=none header.from=gmail.com; errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-received: by 2002:a1c:99c2:: with SMTP id b185mr35642567wme.52.1593724375910; Thu, 02 Jul 2020 14:12:55 -0700 (PDT) x-topics: [EE] x-content-filtered-by: Mailman/MimeDel 2.1.6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 > , perhaps running at a higher frequency followed by a digital counter > May I suggest the CD4541B (and it's variants) https://www.ti.com/lit/ds/symlink/cd4541b.pdf Effectively a 555 timer with a couple counter stages added on. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .