Reorganized directory structure. Better main index page.

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

diff --git a/power/12V Lead-Acid battery changer and terminal/index.org b/power/12V Lead-Acid battery changer and terminal/index.org
new file mode 100644 (file)
index 0000000..c625858
--- /dev/null
+++ b/power/12V Lead-Acid battery changer and terminal/index.org
@@ -0,0 +1,83 @@
+#+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]]