| Electronics > Beginners |
| Car DVR excluave power box - tweak from 11.6V to higher cutoff Voltage |
| (1/2) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |