Newsgroups: sci.electronics.design
Subject: Re: 2018A33 step up converter
References: <nnd$06a1c856$7ded3f70@07ce76ea2de4e870>
From: albert@spenarnc.xs4all.nl
X-Newsreader: trn 4.0-test77 (Sep 1, 2010)
Originator: albert@cherry.(none) (albert)
Message-ID: <nnd$71d27634$2ffcd220@32baeab72c81e90b>
Organization: KPN B.V.
Date: Sun, 01 Jun 2025 19:39:48 +0200
Path: ...!news.mixmin.net!weretis.net!feeder8.news.weretis.net!feeder1.feed.ams11.usenet.farm!feed.usenet.farm!feed.abavia.com!abe006.abavia.com!abp004.abavia.com!news.kpn.nl!not-for-mail
Lines: 29
Injection-Date: Sun, 01 Jun 2025 19:39:48 +0200
Injection-Info: news.kpn.nl; mail-complaints-to="abuse@kpn.com"
Bytes: 1903

In article <nnd$06a1c856$7ded3f70@07ce76ea2de4e870>,
 <albert@spenarnc.xs4all.nl> wrote:
>I am experimenting with the 2018 step up converter.
>The circuit is available from aliexpress , most everywhere.
>
>There is a inductance, a Skottky diode, and capacitance, and the
>circuit. The 2018 cuts the coil short to earth. The diode fill the
>capacitor and the output is measured for a feedback.
>Textbook step up. Rock solid 5 Volt.
>
>Now I have this (apparently) wild idea. I add another diode reversed
>and a capacitor, to prey on the output. The circuit is not phased at all,
>solid 5.08 V as far is it original function.
>But I get a couple of negative millivolt out.
>
>What am I doing wrong? Or should this work?
>I checked this over and over again.

Too late to cancel this post. I discovered that I rectified
the negative swing. Soo embarassed to leave out the charge capacitor.

>
>Groetjes Albert
-- 
Temu exploits Christians: (Disclaimer, only 10 apostles)
Last Supper Acrylic Suncatcher - 15Cm Round Stained Glass- Style Wall
Art For Home, Office And Garden Decor - Perfect For Windows, Bars,
And Gifts For Friends Family And Colleagues.