Return-Path: X-Spam-DCC: paranoid 104; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u22CQOhS014715 for ; Wed, 2 Mar 2016 13:26:24 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ab5ng-0007ma-SZ for rs_out_1@blacksheep.org; Wed, 02 Mar 2016 12:22:44 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ab5ng-0007mQ-J8 for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2016 12:22:44 +0000 Received: from mail-vk0-x22c.google.com ([2607:f8b0:400c:c05::22c]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1ab5ne-0004Ih-Qf for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2016 12:22:43 +0000 Received: by mail-vk0-x22c.google.com with SMTP id c3so199408190vkb.3 for ; Wed, 02 Mar 2016 04:22:42 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to; bh=TXnmaHzhLN6Mxh40TVH1p9mkkcCf4joXTF7CeSrg0SU=; b=tk3sPM4OVd/J2ekcqxnt68s9R7uuEKaakm+MEg1A2+l91O2KrRV4wM8DaCgIB6GX1C gnleuGyH9sN+gy2KO+vapg+PjmxhjCU/8kqt20DkhCM3FIMbBkjCKAM/OOuYmGZ51F8o g0k/G2skZhwehCfpwjtpLtZy1HJ56a0WF4rbIMUVIIrLNFW6iAz+rvTsZ/EaWB2x1hWM qoKoPaP/jcMZ3uWCHHeu5TKI0jTJavT9efUSVGtIjRx9xYnCj60pI26abMBnL7oyRnWl iW+IHBnKQ/ovRAPmTltm+rhUOkNBrl6XubkXVvc/wa6eIR+MT4bj5jSAro3X7br6+NFD 2wUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to; bh=TXnmaHzhLN6Mxh40TVH1p9mkkcCf4joXTF7CeSrg0SU=; b=FjTH0NoOKr4wgWlmzV7MzHcEx5TJEdcJcwYstPyNpeEhgFmpc4f4kyCjwyxi3BAIb3 5Q5Z+2Ffum35IqvOg6PVWckoIzeXx3JzA8wvNvmeACQy1DqgtS+CWqQhKhQTu9AmBcIa m2Ks17XEBBTIDyNsnguhRzEwuaWrFVIj8x1zVsAn4LBOrUVQ8NPIgkylKB9eJrAEfH3q tQl9B6MH2URnxq2yZLbHmSYegzDtw5wxkmQ+JH7nDPFSox9AcyWkmAu65ZmrF2nHaC+x vdgvK3QSPpVZ4xDdigNH2zU0yMXPCi9wu8Ju1Mr8EdV8vSEQBpiPF8L91MDD4k3Og/Fn J1pg== X-Gm-Message-State: AD7BkJISNC500aoJR1OZ4MKWvon9Fk/+D43GmyU3WiqJ8AV/Zv4xbzjcVat5yg8V3rMGNk1JGWnNA+enAv7/SA== MIME-Version: 1.0 X-Received: by 10.31.146.2 with SMTP id u2mr16492217vkd.19.1456921361495; Wed, 02 Mar 2016 04:22:41 -0800 (PST) Received: by 10.159.32.198 with HTTP; Wed, 2 Mar 2016 04:22:41 -0800 (PST) In-Reply-To: <56D6D9BC.2040308@abelian.org> References: <56D6D9BC.2040308@abelian.org> Date: Wed, 2 Mar 2016 12:22:41 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: d7907c3bf895ca41e0bedc3fa074f0d4 Subject: Re: LF: A divider with no power supply Content-Type: multipart/alternative; boundary=001a1143a7ec37ed9b052d0ff099 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7169 --001a1143a7ec37ed9b052d0ff099 Content-Type: text/plain; charset=UTF-8 Yes, I had that once. Surreal, isn't it ;-) 'jnt On 2 March 2016 at 12:17, Paul Nicholson wrote: > > I just discovered something as I turned off the 12V supply to > the CD4040 I've been using to divide 477.69kHz by 16. > > With the supply off - it still works - with a nice square > 29855.625 Hz output! > > It seems that the input to the divider, 477.69kHz sine at > 4.5V peak biased at about 6V is passing through the input > protection diodes of the CD4040 and supplying the Vdd rail > quite sufficiently for the divider to operator. The rail > voltage is 7.76V and the output is a square with > amplitude 7.4V. > > -- > Paul Nicholson > -- > > --001a1143a7ec37ed9b052d0ff099 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Yes, I had that once.
Surreal, isn't it= ;-)

'jnt


<= div class=3D"gmail_extra">
On 2 March 2016 at= 12:17, Paul Nicholson <vlf0403@abelian.org> wrote:

I just discovered something as I turned off the 12V supply to
the CD4040 I've been using to divide 477.69kHz by 16.

With the supply off - it still works - with a nice square
29855.625 Hz output!

It seems that the input to the divider, 477.69kHz sine at
4.5V peak biased at about 6V is passing through the input
protection diodes of the CD4040 and supplying the Vdd rail
quite sufficiently for the divider to operator.=C2=A0 The rail
voltage is 7.76V and the output is a square with
amplitude 7.4V.

--
Paul Nicholson
--


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