After all these tweaks, you will be able to catch Δv from Ni-Ca/Ni-Mh at charging currents > 0.5C This firmware uses a trick with resampling and adding artificial noise. Change native iMax firmware to cheali-charger. Improve the stability of the reference voltage. In order to somehow facilitate the work of the ADC, it is necessary to carry out a set of measures: 10bit is barely enough for the range 0v - 30v with an accuracy of 0.29mV. The second problem is the small bit depth of the ADC and the noise from the power supply and digital circuits. In this case, VT26 or VT27 are usually on. As a bonus, this resistor fixes a bug feature in some iMaxes - die when turned on without load. This problem is easily solved by adding a 4.7 kΩ resistor R128 in parallel with C21. The first - during switching on and with each measurement on the capacitor C21 and the output terminals, a surge of the order of 3-4 volts occurs, which introduces not frail distortions Δv for 1.2 volt batteries. My opinion - difficulties with Δv arise due to several jambs. At one time I wrote to the community about the problem with Δv, but did not receive a response. This is a problem with Δv during charging of 1.2 volt Ni-Ca and Ni-Mh batteries. With their developments he shared in the community 'Born with a soldering iron'.īut in any barrel of honey there is always a fly in the ointment. The most successful attempt to draw a diagram and understand how it works was made by the user electronic-irk. There are at least three circuits of the original iMax-B6 circulating on the net. There are no third-party firmware and it does not seem to be. It looks like the vangi made a mistake - it turned out to be MEGAWIN MA84G564. Chip in TQFP48 package and without marking. In 2016/2017, the Chinese reached the bottom of optimization and released a new charger that normally charges only lithium. It is difficult to call it a clone, since this device is on a completely different microcontroller and only outwardly similar to the iMax-B6. A copy with differences in the scheme and board. An exact copy of SkyRC on ATmega32 made in the basement (this one came across to me). Then it was successfully licked by SkyRC, and everyone forgot about Bantam. The original was called BC-6 and was produced by Bantam based on ATmega32/ATmega32L. There are several versions of the charger: Any aircraft modeler or a person who has Li-Po batteries in his household will recognize the blue shaitan box from afar.įor its time, charging turned out to be so revolutionary and simple that everyone began to copy it. The iMax-B6 universal charger is rightfully considered popular.

Imax b6 charger problems