Eagle PCB Schematic and Board Design for Small Flashlight Project with 4 Components

A small flashlight project requiring an Eagle schematic and PCB design with initially four components was discussed. The requester offered to provide a Bill of Materials (BOM) and pay for the design service. A quoted price was $1.00 each for the circuit schematic and PCB layout. The design scope expanded to seven components due to the addition of a battery charging controller. The requester planned to prototype locally using a nearby fabrication service with specific design rules. A hand-drawn schematic and component datasheets were shared for review. Critical feedback highlighted that the chosen battery cells were limited to 10mA max and unsuitable for the design, and the LEDs were connected in reverse polarity requiring at least 3.3V plus resistor voltage drop. The battery charging IC was misidentified and incompatible with magnesium lithium cells. The requester acknowledged the need to switch to higher capacity 123A battery packages capable of 1C discharge rates. It was also noted that similar flashlight circuits are commercially available at very low cost, questioning the viability of custom design for this application.
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