the modder 's diary part 09:
learning a lot these days. first of all i am now using the prototyping boards i always used in the past not only with soldering points but complete lines, it is much easier (at least for me) to build components without making mistakes, and so i have completely rebuild the different parts of the charger interface:
bottom left you see the pcb prototyping boards i am now using, on the right the old one. also i now use solder with an diameter of 1mm instead of 0.5mm, you can solder much faster and so the components get not so hot while soldering.
top left you see the different components of the charger and PSU interface, from left to right:
- input for ac voltages with bridge rectifier and capacitor
- USB input with capacitor
- constant current stage
- voltage regulator stage
and top right the dc/dc step up / step down converter i use.
best of all i have tested the different components (after some debugging and minor mistakes including damaging the usb port of one of my notebooks) and everything seems to work now.
all components connected the input stages for both ac and usb are working as input for the dc/dc converter (the converter output adjusted to 13v), the constant current stage delivers about 350mA and the voltage regulator stages exactly 8.4v and 350mA when shortening the output.
the only point i was not able to test is to use the components to run and charge the tu-05 as i have no complete tu-05 running at the moment.
and here is the schematic (hopefully without any errors):
so everybody now can run and charge his tu-05 even with USB.
@Sam Edwards - hope this helps !
Edited by GermanGuy - Today at 4:54 pm