Reorganized directory structure. Better main index page.

[physical.git] / misc / 12V Lead-Acid battery changer and terminal / index.org

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-#+TITLE: 12V Lead-Acid battery changer and terminal
-#+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.
-
-+ Author:
-  - Svjatoslav Agejenko
-  - Homepage: https://svjatoslav.eu
-  - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
-  - [[../../index.html][Other physical projects in this repository]]
-  - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-[[file:make.png]]
-
-[[file:make,%202.png]]
-
-Simple charger and terminal (front-end) for 12V lead-acid battery.
-
-Idea is to distribute power from rechargeable 12V battery to various
-appliances (soldering iron, radio transmitters, etc..) while also
-providing use-charging in the background.
-
-Single on/off button disconnects battery and up-step voltage source
-from front panel terminal connectors.
-
-[[https://www.amazon.de/gp/product/B07G4KWV6S/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1][Tecnoiot MT3608]] voltage up-step is used. 3V DC external power supply
-is used to feed voltage up-step. Up-step is tuned to ~14.4 V.
-
-[[file:schematic.png]]
-
-Current design is rather of blog (experience sharing) value. It has
-quite some drawbacks:
-
-- Warning: Circuit has dangerous instability. Requires low voltage
-  ~3V but relatively high current external power supply. Using
-  higher voltage but low current power supply could easily lead to
-  situation where step-up generated load pushes power supply output
-  voltage down too much. This leads to too much power being lost
-  within power supply and easily leads to power supply overheating!
-
-- There is no dedicated current limiter. 3V external power supply
-  and up-step are acting as current limiters.
-
-- While RCA connectors do work as DC power connectors, but are not
-  intended to be used this way and are not very reliable.
-
-- Voltage up-step provided output is not very clean. Extra capacitors
-  and induction coils could be added to remove high frequency noise in
-  the voltage.
-
-- Metallic and shielded body would be helpful to reduce
-  electromagnetic/radio noise generated by step-up.
-
-* Body
-
-[[file:body.png]]
-
-[[file:cover.png]]
-
-
-+ Download:
-  + [[file:body%20and%20cover.FCStd][body and cover FreeCAD file]]
-  + [[file:body.stl][body in STL format]]
-  + [[file:cover.stl][cover in STL format]]