Electronics > Beginners
Car DVR excluave power box - tweak from 11.6V to higher cutoff Voltage
Folxs:
Hi, I biught on Aliexpress DVR power system box, that cutoff at 11.6V to prevent deep battery discharge - but I would like to twak that treshold from 11.6V to for example 12.6V.
I wanted to reverse engineer that box but I can't find datasheet for main component - that 8321 / R207B2 and that ACAA component (transistor I believe).
Can anyone help me?
EDIT:
I added also clear PCB and bottomis normal and mirror, to better understandingof PCB connections
rf+tech:
Hi Folxs,
If you put forth the effort to create a schematic from the board and fill in all component values, this will improve your chances for someone to be of assistance. It would be a discourtesy to expect others to do this for you.
Let's see what you can put together.
RF+ Tech
Ian.M:
Its probably *NOT* a transistor. Googling: ACAA SOT-23 SMD code
should lead you to the part number of a Maxim supply supervisor IC. ;)
Folxs:
--- Quote from: Ian.M on May 25, 2019, 01:05:33 am ---Its probably *NOT* a transistor. Googling: ACAA SOT-23 SMD code
should lead you to the part number of a Maxim supply supervisor IC. ;)
--- End quote ---
Thank You very much - I got it ;)
Now I know how this cutoff system works!
There is Voltage divider of that 1% resistors to this ACAA / Maxim MAX809T, that send RESET when voltage on divider is 3.08V.
So, changing this values for 3.08V for desired cutoff voltage can be done ;)
But - I still don't know what the heck is that mysterious SOIC8 - this is some buck converter IC
Ian.M:
You'd need to identify which semiconductor manufacturer uses that stylised 'B" logo on the SOIC-8 buck chip. If you are lucky, someone here will recognise it if you post a closeup of the chip.
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