The following information seems to generalize to any of MingHe’s buck/boost converter designs with the 8x2pin daughter board with display and buttons).
There’s a good writeup about this device submitted by a reader. I’m not really a fan of this device as it seems the quality varies widely (and voltage overshoots are never a good thing), so be careful if you get one.
Though most of this info is for the more common MingHe buck or boost converters, I happen to have the MingHe D3806 Buck+Boost converter:
Many reviews are out there for the B3603 and some for the BST400. They all seem to have the same basic functionality on the control board, though the calibration points will differ depending on available output ranges.
My experience with this device seems to be in line with that of other reviewers – namely, it works well with no major issues. However, there are two things to keep in mind:
I’ve noticed that light loads (e.g., 5V < 200 mA) tend to cause momentary voltage overshoots on power down (the lower the load, the more the overshoot)! even a short burst of 12V into a 3.3V or 5V circuit can kill a device, so beware. Might want to add a small (say 2W) load resistor for safety for small loads (if not in CC mode).
As others have noted, if you press and hold “Set”, you enter calibration mode (you’ll see something like “–F1–” on the display). If you didn’t mean to enter cal mode just power it off right now, then back on, to ensure you’re out of that mode! See the EEVBlog review below for how this can otherwise quickly lead to electronic sadness if you accidentally step into the higher voltage cal settings unwittingly.
Notes on the Function Menu settings (AKA the “secret” menu since it’s not exactly obvious):
Hold OK on power-up and wait for the display to cycle -0-, -1-, -2-, -0-… Release OK to toggle and then view that setting. Power down and repeat the process as necessary.
- -0- — y=output on initial power; n=output only after pressing OK (I prefer this)
- -1- — y=show V, A, power, and cumulative amp-hour displays; n=V, A only
- -2- — y=cycle displays by default; n=don’t cycle by default
There seems to be a way to enter quite a few voltage/current presets – check out the manuals for details (seems like this could be prone to accidental selection like calibration is, but YMMV).
- MingHe’s manual for the B3603 (direct)
- MingHe’s manual for the D3806 (via Banggood)
- MingHe’s manual for the BST400 (direct)
- MingHe’s manual for the B3606 (direct)
- A user manual I found for the B3603 (shows how to read the display and exercise the function menu)
- A document with the calibration process
- A thorough text review of the B3603 (Rick Law at EEVBlog)
- A video review of the B3603 (Julian Ilett)
- A video review of the BST400 (Julian Ilett)
- Another, more critical review of the BST400 (Jim Conner)
- Note: I didn’t experience the problem he noted at super-low voltage settings – I suspect it was a buggy old revision of the device firmware
MingHe’s ZXY6005S and ZXY6010S devices are very intriguing! There are older revisions (2012) and newer ones (>= 2013-08) on eBay… I haven’t tried it yet but Julian has it in his round-up video. While I think the D3806 hits the sweet spot for power and flexibility for me, that LCD + rotary encoder is pretty sweet!