* Project description
I needed dual voltage power supply for my lab that runs on mains
-electricity (wall power) and slowly charges attached 12V Lead-Acid
-battery. Lead-acid battery in turn provides high current when needed
-as well as power in portable situations or when mains electricity is
-not available.
+electricity (wall power) and slowly charges (use-changing) attached
+12V Lead-Acid battery. Lead-acid battery in turn provides high current
+when needed as well as power in portable situations or when mains
+electricity is not available.
[[file:make.png]]
Power supply provides about 13 Volts and 5 Volts simultaneously.
-!!!WARNING!!! I use USB-A connectors for power output, but IT IS NOT
-COMPATIBLE WITH USB DEVICES AND POSSIBLY WITH EXISTING USB CABLES.
+*!!!WARNING!!!* [[../alternative%20USB%20layout/][Alternative and incompatible USB wiring/layout]] is
+being used here.
-Normal USB devices and cables should not be plugged in! It would
-damage device/cable and likely power supply.
+*Normal USB devices and cables should not be plugged in! It would
+damage device/cable and likely power supply.*
I found USB-A connectors to be easily available, cheap, reliable and
functional, so I re-purposed connector for my own needs but I'm using
totally incompatible electrical wiring.
-[[file:connector%20terminal/USB%20hack.png]]
+[[file:../alternative%20USB%20layout/schematic.png]]
As seen, it has dual voltage output. Additionally one wire is
-dedicated to data transmission and can be used with [[https://en.wikipedia.org/wiki/1-Wire][1-wire]]
-protocol. Power supply simply passively links all data wires together
-but does not participate in communication.
+dedicated to data transmission and can be used with [[https://en.wikipedia.org/wiki/1-Wire][1-Wire]] protocol
+
+1-Wire data router/hub is really simple. Power supply simply passively
+links all data wires together.
Power supply uses 3D printed body with lots of holes, for fanless
cooling.
projects / physical.git / blobdiff