In the Home Depot Deals thread some new flashlights have been showing up on the shelves. These lights were promptly purchased and immediately disassembled for detailed inspection and to see the driver board components and how they operate. Some photos are posted in that thread also.
In 2 cases, the Defiant LED puck lights(3 AA), and the Husky 500 Lm spotlight (3 C), they are using an 8-pin mcu to control these lights and provide 2 or 3 modes of operation. The part has been etched to remove the number and it has a unusual power and grounding: power pins are 1 and 4, while ground is pin 8. 2,3 and 6 are not used. pin 5 is used to drive an N-channel FET scheme in one case, and pin 7 is used to drive a P-channel FET in the other. Looking for help to identify the device and how it is programmed. i think they may be the same part in both devices.
In addition there is another unknown device, D7136, used on the spotlight board, that
[EDIT: TBone identified this below as AMC7136 and it only has 5 pins plus tab]
has a current sense input to regulate and control current. It has 6 pins, where pin 2 and 5 are grounded, pin 1 is reading the current sense resistor voltage, pin 3 receives the drive from p5 of the unknown chip above, and pin 4 drives the gate of the N-fet, and pin6 is not used. Can’t seem to find any id on this device—at first i thought it was a 7135, but pin 5 is a fat bat-wing tab connected to ground, and it has 6 pins total.[//EDIT]
i will try to get the schematics drawn up and post them here later, plus i can add some photos, (but not much to see with etched chips).
Modes: Spotlight has trigger that goes hi, lo, off. The pucks have a button switch with hi, low, strobe, off.
