Added Baofeng battery charger mod

[physical.git] / misc / Baofeng radio battery charger case mod / index.org

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+#+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]]