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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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+<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>
projects / physical.git / blobdiff