E82152 Schematic | 2021

The code E82152 identifies a printed circuit board manufactured by Gold Circuit Electronics Ltd (GCE) that complies with UL safety standards. As this code refers to the PCB fabricator rather than the device designer, finding a 2021 schematic requires locating the specific motherboard part number or OEM model number. For more information on this UL listing, visit UL Solutions. E82152 for GOLD CIRCUIT ELECTRONICS LTD | UL Solutions

Simplified Schematic (Textual Representation)

For illustration, focus on the feedback loop around the LM2902: e82152 schematic 2021

[24V DC IN] ---[LM7808 Regulator]--- +8V Rail (Vcc for Op-Amps)

               [Input Signal IN+]
                     |
                [R1 - 10kΩ]
                     |
     +----[LM2902_A (Buffer)]---+---[R3 (4.7kΩ)]---[LM2902_B (Gain Stage)]
     |                           |
     |                          GND
     |                     [R2 (1kΩ) to GND]
[Current Sense]
     |
 [Shunt R25]
     |
    GND
[LM2902_C (Window Comparator)]---[LM339 (Hysteresis)]---[Gate Drive OUT]

Critique of "2021" Revision Context

Why the "2021" designation matters:

  1. Supply Chain Substitutions: In 2021, the electronics industry faced severe component shortages. If you are reviewing a schematic from 2021 for this part, verify the Controller IC. Manufacturers often swapped controllers (e.g., switching from ILI9486 to an equivalentHX8357 or ST7796) due to availability. This requires a change in the initialization code, even if the schematic pinout remains physically identical.
  2. RoHS Compliance: The 2021 revision likely reflects updated environmental compliance standards (RoHS 3), ensuring lead-free soldering profiles in the manufacturing files.

Component Identification

Overview