Schematic Review for Beginner
Would greatly appreciate some help reviewing the schematic I'm designing for a custom camera flash. This is my first time doing anything like this so I was hoping to get some feedback before moving on to the layout stage. Some more details not contained in the schematic:
- I'm planning on using the following parts harvested from a Godox flash:
- 900mAh, 7.4V battery (has 3 wires but I don't think I need the third which is why that pin is crossed out in the schematic)
- 330V 370uF photoflash capacitor
- Xenon tube
- For charging I'm planning on using something like this to step the USB-C's 5V up to the 8.4V required for charging the battery. I'm also planning on tapping the raw 5V current and reading this from my STM32 (through the voltage divider) so that I can implement some logic to set the LED to a certain color to indicate that it's charging. There's also no real power switch in this schematic because I'm planning on implementing a "soft sleep" mode by powering down the STM32, 12V step up converter, and the 370uF capacitor charging circuit.
- For the 12V to 330V step up circuit I'm planning on using a daughter board, something like this
- Xenon tubes require a momentary high voltage spark (around 4kV) to ionize the gas which then allows the actual flash current to flow through and produce the light. For this I'm planning on using this trigger coil
I would really appreciate any feedback on the overall schematic as well as the plan in general. Especially since this deals with some high voltage current I'd like someone with experience to take a look before I go any further.
Some of the parts I'm planning on using, like the 12V boost and USB-C charging boards, seem hard to source. I'm only able to find them on AliExpress really so if anyone has any experience with ordering parts from there please let me know if you think this is a good idea. Thanks!