Ham radio battery charger mod
+Table of Contents
+1 General
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+
- 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
+
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+
- Homepage: https://svjatoslav.eu +
- Email: svjatoslav@svjatoslav.eu +
+
+ - Valeria Agejenko +
+
+ - Svjatoslav Agejenko
+
- See also: + +
2 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: +
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+
- 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. +
+
+Body ignores small physical differences between batteries and both can +be plugged in. +
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+Front side contains critical fragment of the original changer circuit +board to drive the actual battery charging. +
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+Back side contains voltage upstep converter that is tuned to convert +5V USB input to 10V output that is required by the charger. +
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+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. +
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+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. +
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+After assembly is complete, back, front and bottom parts are sealed
+with lid: 
+