6V Driver with LVP

[wight]

@kelsey

Thanks wight! That’s what I’m hoping to do in the future. At this point I don’t have all the goodies required to flash firmware but it is definitely on the horizon. I thought LVP didn’t work after the zener mod because that bridged a capacitor which made the LVP work. Are you saying LVP is configurable in the firmware?

Also in Richard’s store, the LVP with zener mod isn’t an option with the Qlite, only with the FET driver.

Woops! You are correct, an unmodified Qlite never has LVP after the Zener mod.

Drivers like RMM’s Moonlight Special… hmm, I forgot it doesn’t have a Zener option. So much for that. OK, starting over… drivers like my A17-PZL and A17-L81 should have LVP if setup correctly. Only the A17-PZL actually has pads for the Zener and those are for an SOD-123 Zener so the smaller SOD-323 Zener diodes we use now may be a bit of a stretch across those pads - using an SOD-123 sized Zener is the easy solution to that. “Correctly” at this point means building the driver with proper divider resistors to get <1.1v throughout the input voltage range (using a voltage divider calc like the one from Raltron) and then using ToyKeeper’s battcheck test firmware to determine values to plug into the firmware… and then punching those into a real firmware and compiling that and flashing it.

Modifying a Qlite or Nanjg-105c/d to include LVP after a Zener mod is a much bigger pain than just building the A17-PZL from scratch.

EDIT: I failed to point out that if the Moonlight Special takes voltage measurements before the diode AND has C1 after the diode then it would easy to do a Zener mod on that. Even in that case… with that much effort it’s easier and cheaper to build a driver on a fresh PCB.