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Understanding First

Circuits Academy -- a new interactive experience

Understand the circuit before you touch the wire

Instruments linked to reviewed real circuit diagrams -- choose a device, trace a path by its real name, place the probes where they belong, and watch how a diagnosis is actually built. Training for understanding, not a measurement tool on real hardware.

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Free for every registered, verified account. Sign in or create an account. The existing legacy premium area is unaffected and unrelated to this experience.

Charging and USB circuit map on the Redmi K40 Gaming showing the mainboard and subboard path from the port to the battery
Charging & USB: the full path from subboard to mainboard, with the source boundary between them preserved exactly.

How the experience works

  1. 01

    Choose a device

    Start from the reviewed catalog of devices and circuits -- not every phone, only the ones with documented source coverage.

  2. 02

    Trace a named path

    Every net in the Circuit Lab keeps its real name from the source diagram -- trace it visually exactly as it appears on the original board.

  3. 03

    Place the probes

    Use the linked multimeter or oscilloscope to place probes on recorded points, with their original label and value -- nominal vs. measured, never blurred.

  4. 04

    Learn the diagnosis

    Follow the Phone Startup or charging-circuit sequence to see how a fault hypothesis is built from evidence -- with no promise of a guaranteed diagnosis.

See the signal. Understand the story.

From communication pulses to power switching: three oscilloscope views from the lab. These are adjustable teaching simulations, not live phone measurements.

Oscilloscope SCL and SDA channels showing START, a byte and ACK

I²C · Clock meets data

Read clock and data together. Follow the start of a message, its byte and the ACK response.

Simulated Buck SW voltage with switching edges and illustrative ringing

Buck · Before the output inductor

See the SW node before the inductor and distinguish it from the filtered output voltage.

Simulated Boost SW voltage in DCM, showing inductor discharge and ringing

Boost · Under light load

Recognize the switch-on interval, inductor discharge and ringing in this discontinuous-conduction example.

Real screenshots from inside the Academy

Circuit Lab showing the J6600 main camera connector on the Redmi K40 Gaming with a linked digital multimeter displaying a recorded 2.80V reading on CAMW_AVDD_2P8
Circuit Lab: the camera connector path with a diagram-linked digital multimeter -- an original recorded value, not a live reading.
Charging and USB circuit map on the Redmi K40 Gaming showing the mainboard and subboard path from the port to the battery
Charging & USB: the full path from subboard to mainboard, with the source boundary between them preserved exactly.
The explore-handset-circuits stage of the Phone Startup lesson showing activation buttons for camera, audio and sensor circuits with subboard USB port detail
Phone Startup: the explore-circuits stage, with activation controls linked to each recorded circuit.

What's inside today

The catalog exposes only the reviewed teaching scope. Coverage per device is bounded strictly by its reviewed sources -- never more.

Source boundaries (mainboard vs. subboard) and the distinction between nominal and measured values survive unchanged from the source, with no simplification.

Three workspaces inside the Academy

  • Devices & Circuits

    Browse the available devices and every documented circuit inside them, with its real status.

  • Circuit Lab

    An interactive component and path map, with a multimeter and oscilloscope linked to the source diagram.

  • Phone Startup

    A teaching sequence through the boot stages, from base power to the display, built strictly from reviewed evidence.