Schematics

A visual wall of circuit ideas.

Browse simplified diagrams, test points, and visual references for the calculators, lessons, and DIY projects.

Safety first, always.

ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.

Open Safety Center

Visual schematic

LED current path

Battery voltage pushes current through the resistor, then the LED. The resistor is the part saving the LED.

Low-voltage model

TP1: supply voltage

TP2: resistor drop

TP3: LED polarity

Open LED current path

Visual schematic

RC charge timer

The resistor controls how quickly the capacitor voltage rises. Bigger R or C means a slower timing action.

Low-voltage model

TP1: supply

TP2: capacitor voltage

TP3: trigger/output

Open RC timer

Visual schematic

Electromagnet coil

Current through the coil creates a magnetic field. The switch-off spike needs a safe path.

Low-voltage model

TP1: coil current

TP2: switch node

TP3: coil temperature

Open Electromagnet coil

Visual schematic

Speaker crossover split

A capacitor protects the tweeter from low frequencies while the woofer handles the lower band.

Low-voltage model

TP1: amp output

TP2: tweeter high-pass

TP3: speaker polarity

Open Speaker crossover

Visual schematic

Solar charger flow

Panel energy passes through charge control before the battery and protected 5 V output.

Low-voltage model

TP1: panel volts

TP2: battery volts

TP3: USB output

Open Solar charger flow

Visual schematic

Crystal radio signal path

The antenna feeds a tuned LC circuit, then a diode detector extracts audio for the earpiece.

Low-voltage model

TP1: antenna

TP2: tuned circuit

TP3: detector audio

Open Crystal radio path

Diagram index

Jump from picture to lesson.

Open Raspberry Pi header Open schematic reader Open circuit cookbook Try interactive labs

Calculator

A visual wall of circuit ideas.

LED current path

RC charge timer

Electromagnet coil

Speaker crossover split

Solar charger flow

Crystal radio signal path

Jump from picture to lesson.

Ohm's Law

Power

Transformer Turns Ratio

RC Time Constant

RL Time Constant

RLC Resonance

Speaker Crossover Frequency

Solar Battery Runtime

AC vs DC

Resistors

Capacitors

Inductors

Transformers

Amplifiers

Speakers

Radio Waves

Solar Basics

LED Flasher

Mini Amplifier

Solar Phone Charger

Electromagnet

Crystal Radio

Speaker Crossover

Bench Power Supply

Simple Alarm Circuit