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.
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This design is released under Creative Commons Zero (CC0) license.
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-Simple charger and terminal (front-end) for 12V lead-acid battery.
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-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.
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-Single on/off button disconnects battery and up-step voltage source
-from front panel terminal connectors.
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-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.
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-Current design is rather of blog (experience sharing) value. It has
-quite some drawbacks:
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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!
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There is no dedicated current limiter. 3V external power supply
-and up-step are acting as current limiters.
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While RCA connectors do work as DC power connectors, but are not
-intended to be used this way and are not very reliable.
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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.
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Metallic and shielded body would be helpful to reduce
-electromagnetic/radio noise generated by step-up.
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