"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
-<!-- 2021-04-11 Sun 21:16 -->
+<!-- 2021-04-11 Sun 21:49 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Physical projects</title>
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
-<li><a href="#orgb513295">1. General</a>
+<li><a href="#org64db73d">1. General</a>
<ul>
-<li><a href="#orged64710">1.1. repository</a></li>
+<li><a href="#orgfc9b3da">1.1. repository</a></li>
</ul>
</li>
-<li><a href="#orgf4a5dca">2. Cases, covers, holders, organizers</a>
+<li><a href="#orgf24fe84">2. Cases, covers, holders, organizers</a>
<ul>
-<li><a href="#org4e3cc82">2.1. Measurement</a></li>
-<li><a href="#org65e186c">2.2. Optics</a></li>
-<li><a href="#orgbe6fb91">2.3. Miscellaneous</a></li>
-<li><a href="#orgb3c75f3">2.4. Cable / wire</a></li>
+<li><a href="#orgfec7ccc">2.1. Measurement</a></li>
+<li><a href="#org0ef637f">2.2. Optics</a></li>
+<li><a href="#orgce0f8ef">2.3. Miscellaneous</a></li>
+<li><a href="#org8cb4475">2.4. Cable / wire</a></li>
</ul>
</li>
-<li><a href="#org304f784">3. Miscellaneous</a>
+<li><a href="#org865bc1f">3. Miscellaneous</a>
<ul>
-<li><a href="#orge9b4f51">3.1. Audio</a></li>
+<li><a href="#orgbded338">3.1. Audio</a></li>
</ul>
</li>
-<li><a href="#orgfccf8f8">4. Optics</a></li>
-<li><a href="#org122e8dd">5. See also</a></li>
+<li><a href="#orge307eb9">4. Optics</a></li>
+<li><a href="#org29e750b">5. See also</a></li>
</ul>
</div>
</div>
-<div id="outline-container-orgb513295" class="outline-2">
-<h2 id="orgb513295"><span class="section-number-2">1</span> General</h2>
+<div id="outline-container-org64db73d" class="outline-2">
+<h2 id="org64db73d"><span class="section-number-2">1</span> General</h2>
<div class="outline-text-2" id="text-1">
<p>
Collection of physical projects. Electronics, 3D designs etc..
</ul>
</div>
-<div id="outline-container-orged64710" class="outline-3">
-<h3 id="orged64710"><span class="section-number-3">1.1</span> repository</h3>
+<div id="outline-container-orgfc9b3da" class="outline-3">
+<h3 id="orgfc9b3da"><span class="section-number-3">1.1</span> repository</h3>
<div class="outline-text-3" id="text-1-1">
<ul class="org-ul">
<li><a href="https://www2.svjatoslav.eu/gitweb/?p=physical.git;a=snapshot;h=HEAD;sf=tgz">Download latest snapshot in TAR GZ format</a></li>
</div>
</div>
-<div id="outline-container-orgf4a5dca" class="outline-2">
-<h2 id="orgf4a5dca"><span class="section-number-2">2</span> Cases, covers, holders, organizers</h2>
+<div id="outline-container-orgf24fe84" class="outline-2">
+<h2 id="orgf24fe84"><span class="section-number-2">2</span> Cases, covers, holders, organizers</h2>
<div class="outline-text-2" id="text-2">
</div>
-<div id="outline-container-org4e3cc82" class="outline-3">
-<h3 id="org4e3cc82"><span class="section-number-3">2.1</span> Measurement</h3>
+<div id="outline-container-orgfec7ccc" class="outline-3">
+<h3 id="orgfec7ccc"><span class="section-number-3">2.1</span> Measurement</h3>
<div class="outline-text-3" id="text-2-1">
<ul class="org-ul">
<li>Digital caliphers battery mod and storage box
</div>
</div>
-<div id="outline-container-org65e186c" class="outline-3">
-<h3 id="org65e186c"><span class="section-number-3">2.2</span> Optics</h3>
+<div id="outline-container-org0ef637f" class="outline-3">
+<h3 id="org0ef637f"><span class="section-number-3">2.2</span> Optics</h3>
<div class="outline-text-3" id="text-2-2">
<ul class="org-ul">
<li>Case for 52mm macro filter
</ul>
</div>
</div>
-<div id="outline-container-orgbe6fb91" class="outline-3">
-<h3 id="orgbe6fb91"><span class="section-number-3">2.3</span> Miscellaneous</h3>
+<div id="outline-container-orgce0f8ef" class="outline-3">
+<h3 id="orgce0f8ef"><span class="section-number-3">2.3</span> Miscellaneous</h3>
<div class="outline-text-3" id="text-2-3">
<ul class="org-ul">
<li>Book stand
</div>
</div>
-<div id="outline-container-orgb3c75f3" class="outline-3">
-<h3 id="orgb3c75f3"><span class="section-number-3">2.4</span> Cable / wire</h3>
+<div id="outline-container-org8cb4475" class="outline-3">
+<h3 id="org8cb4475"><span class="section-number-3">2.4</span> Cable / wire</h3>
<div class="outline-text-3" id="text-2-4">
<ul class="org-ul">
<li>Cable organizer
</div>
</div>
-<div id="outline-container-org304f784" class="outline-2">
-<h2 id="org304f784"><span class="section-number-2">3</span> Miscellaneous</h2>
+<div id="outline-container-org865bc1f" class="outline-2">
+<h2 id="org865bc1f"><span class="section-number-2">3</span> Miscellaneous</h2>
<div class="outline-text-2" id="text-3">
<ul class="org-ul">
<li>12V Lead-Acid battery charger and terminal
<br/><a href="misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/index.html"><img style="width:100%; max-width:500px;" src=" misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/make.png"></a></li>
+<li>Baofeng radio battery charger modification
+<br/><a href="misc/Baofeng%20radio%20battery%20charger%20case%20mod/index.html"><img style="width:100%; max-width:500px;" src=" misc/Baofeng%20radio%20battery%20charger%20case%20mod/make.png"></a></li>
+</ul>
+
+
+<ul class="org-ul">
<li>adjustable resistor / indicator
<br/><a href="misc/adjustable%20resistor/index.html"><img style="width:100%; max-width:500px;" src=" misc/adjustable%20resistor/make.png"></a></li>
</ul>
</div>
-<div id="outline-container-orge9b4f51" class="outline-3">
-<h3 id="orge9b4f51"><span class="section-number-3">3.1</span> Audio</h3>
+<div id="outline-container-orgbded338" class="outline-3">
+<h3 id="orgbded338"><span class="section-number-3">3.1</span> Audio</h3>
<div class="outline-text-3" id="text-3-1">
<ul class="org-ul">
<li>Portable stereo speaker
</div>
</div>
-<div id="outline-container-orgfccf8f8" class="outline-2">
-<h2 id="orgfccf8f8"><span class="section-number-2">4</span> Optics</h2>
+<div id="outline-container-orge307eb9" class="outline-2">
+<h2 id="orge307eb9"><span class="section-number-2">4</span> Optics</h2>
<div class="outline-text-2" id="text-4">
<ul class="org-ul">
<li>35mm film copying device
</div>
</div>
-<div id="outline-container-org122e8dd" class="outline-2">
-<h2 id="org122e8dd"><span class="section-number-2">5</span> See also</h2>
+<div id="outline-container-org29e750b" class="outline-2">
+<h2 id="org29e750b"><span class="section-number-2">5</span> See also</h2>
<div class="outline-text-2" id="text-5">
<ul class="org-ul">
<li>Jay Doscher blog: <a href="https://back7.co/">https://back7.co/</a></li>
</div>
<div id="postamble" class="status">
<p class="author">Author: Svjatoslav Agejenko</p>
-<p class="date">Created: 2021-04-11 Sun 21:16</p>
+<p class="date">Created: 2021-04-11 Sun 21:49</p>
<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
misc/12V%20Lead-Acid%20battery%20changer%20and%20terminal/make.png
)}}}
++ Baofeng radio battery charger modification
+ {{{imglnk(
+ misc/Baofeng%20radio%20battery%20charger%20case%20mod/index.html,
+ misc/Baofeng%20radio%20battery%20charger%20case%20mod/make.png
+ )}}}
+
+ adjustable resistor / indicator
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+F3 "" 0 60 50 V I C CNN
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+F1 "Device_L" 75 0 50 V V C CNN
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+<title>Ham radio battery charger mod</title>
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+<meta name="author" content="Svjatoslav Agejenko" />
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+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
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+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
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+<link rel="stylesheet" type="text/css" href="https://thomasf.github.io/solarized-css/solarized-dark.min.css" />
+<script type="text/javascript">
+// @license magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt Public Domain
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+ }
+ /*]]>*///-->
+// @license-end
+</script>
+</head>
+<body>
+<div id="content">
+<h1 class="title">Ham radio battery charger mod</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#org6c82e4b">1. General</a></li>
+<li><a href="#orgc5c8965">2. Project description</a></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-org6c82e4b" class="outline-2">
+<h2 id="org6c82e4b"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a></li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a></li>
+</ul></li>
+
+<li>Valeria Agejenko</li>
+</ul></li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a></li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a></li>
+</ul></li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-orgc5c8965" class="outline-2">
+<h2 id="orgc5c8965"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Warning: this project is quite hacky. It requires breaking original
+charger to get required critical charger part. Instructions are not
+very detailed. Only describe the overall idea. Do not attempt to
+reproduce this unless you exactly know what you are doing.
+</p>
+
+<hr />
+
+
+<p>
+I have Baofeng GT-STP and Baofeng UV-82 radios. Their batteries have
+slightly different geometry, so chargers are physically not
+compatible. Also each changer comes with its own power adapter to plug
+into wall power socket. Electrically batteries are apparently
+compatible.
+</p>
+
+<p>
+By building this battery charger I solved 2 issues:
+</p>
+<ul class="org-ul">
+<li>It can charge batteries for both radios. Is physically and
+electrically compatible to both models.</li>
+<li>Wall adapter is no longer needed. Now it is powered by USB connector
+from computer.</li>
+</ul>
+
+
+<div id="orgef5e369" class="figure">
+<p><img src="make.png" alt="make.png" />
+</p>
+</div>
+
+<p>
+Body ignores small physical differences between batteries and both can
+be plugged in.
+</p>
+
+
+<div id="org17d6a62" class="figure">
+<p><img src="body.png" alt="body.png" />
+</p>
+</div>
+
+<p>
+Front side contains critical fragment of the original changer circuit
+board to drive the actual battery charging.
+</p>
+
+
+<div id="orga02cdec" class="figure">
+<p><img src="make, 1.png" alt="make, 1.png" />
+</p>
+</div>
+
+<p>
+Back side contains voltage upstep converter that is tuned to convert
+5V USB input to 10V output that is required by the charger.
+</p>
+
+
+<div id="org0433379" class="figure">
+<p><img src="make, 2.png" alt="make, 2.png" />
+</p>
+</div>
+
+<p>
+Voltage upstep converter can produce significant voltage
+ripples/impulses that travel backwards to the power source and forward
+to the changer. To reduce this effect, there are capacitors and
+inductor.
+</p>
+
+
+<div id="orgff0d03f" class="figure">
+<p><img src="electrical.png" alt="electrical.png" />
+</p>
+</div>
+
+<p>
+Front and back sides are connected by wiring at the bottom. Also there
+are screws to hold original Baofeng charger pins/springs that connect
+to the battery.
+</p>
+
+
+<div id="orge59d24a" class="figure">
+<p><img src="make, 3.png" alt="make, 3.png" />
+</p>
+</div>
+
+<p>
+After assembly is complete, back, front and bottom parts are sealed
+with lid: <img src="cover.png" alt="cover.png" />
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-04-11 Sun 21:46</p>
+<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
+</div>
+</body>
+</html>
--- /dev/null
+#+TITLE: Ham radio battery charger mod
+#+author: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ This design is released under Creative Commons Zero (CC0) license.
+
++ Authors:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
+ - Valeria Agejenko
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+
+Warning: this project is quite hacky. It requires breaking original
+charger to get required critical charger part. Instructions are not
+very detailed. Only describe the overall idea. Do not attempt to
+reproduce this unless you exactly know what you are doing.
+
+------
+
+
+I have Baofeng GT-STP and Baofeng UV-82 radios. Their batteries have
+slightly different geometry, so chargers are physically not
+compatible. Also each changer comes with its own power adapter to plug
+into wall power socket. Electrically batteries are apparently
+compatible.
+
+By building this battery charger I solved 2 issues:
++ It can charge batteries for both radios. Is physically and
+ electrically compatible to both models.
++ Wall adapter is no longer needed. Now it is powered by USB connector
+ from computer.
+
+[[file:make.png]]
+
+Body ignores small physical differences between batteries and both can
+be plugged in.
+
+[[file:body.png]]
+
+Front side contains critical fragment of the original changer circuit
+board to drive the actual battery charging.
+
+[[file:make, 1.png]]
+
+Back side contains voltage upstep converter that is tuned to convert
+5V USB input to 10V output that is required by the charger.
+
+[[file:make, 2.png]]
+
+Voltage upstep converter can produce significant voltage
+ripples/impulses that travel backwards to the power source and forward
+to the changer. To reduce this effect, there are capacitors and
+inductor.
+
+[[file:electrical.png]]
+
+Front and back sides are connected by wiring at the bottom. Also there
+are screws to hold original Baofeng charger pins/springs that connect
+to the battery.
+
+[[file:make, 3.png]]
+
+After assembly is complete, back, front and bottom parts are sealed
+with lid: [[file:cover.png]]
projects / physical.git / commitdiff
