Source: https://mokxi.com/learn/electrical Updated: 2026-11-11 All courses Electrical track # Electronics, from your first LED to a computer you built from gates Current and voltage you can see, then transistors, op-amps, filters, power and PCBs. Every circuit runs in a real circuit simulator in your browser. Free 11 courses, 102 lessons, about 60 hours 4 levels Start at the first rung Electronics basics The track ## Zero to expert, one course at a time This is the electronics underneath everything else on Mokxi: what current, voltage, resistance and time really do in a circuit. You build each circuit on a simulated breadboard, measure it with a meter or a scope, and the simulator checks the result. It starts from nothing, with a loop you wire by hand, and climbs through the circuits engineers use every day: dividers, RC timing, transistors, op-amps, rectifiers and regulators, filters and frequency response, then logic from a single NAND gate up to a working CPU, and finally a board ready for manufacturing. The ladder ## Every course, by level Take them in order, or start on the rung that matches what you already know. Each course page lists every lesson. Level 1 ### Start from zero A breadboard, a few parts and what they really do. 20 lessons · 10 h ### Electronics basics A breadboard and a few parts, with one Uno blink at the start and no processor after it. What current, voltage, time and logic really do. Open the course 4 lessons · 4 h ### Digital logic and memory Build logic from individual gates, then make a bit persist, count and move through a register. Open the course Level 2 ### Real circuits Amplifiers, power, sensors and switching bigger loads. 7 lessons · 4 h ### Transistors and op-amps for real Intermediate, after Electronics basics: the diode curve, biasing a BJT, common-emitter gain, the MOSFET as switch and resistor, op-amp gain both ways, comparators with hysteresis and split supplies. Open the course 7 lessons · 3 h ### Power and batteries Where the volts come from and how to keep them: Ohm's law on a real meter, cells in series and parallel, a regulator, a LiPo on a TP4056, a boost converter, a battery gauge, and a power bank you build yourself. Open the course 7 lessons · 4 h · Arduino Uno R3 ### Sensors and measurement Intermediate: thermistors and RTDs, strain gauges in a Wheatstone bridge, light and IR, current on a shunt and an INA219, ADC resolution and noise, and calibration, finished with a power instrument you check against Ohm's law. Open the course 7 lessons · 4 h ### Relays, contactors and motor control Intermediate, the electrician's course: relay coils and flyback diodes, latching start/stop circuits, interlocks, three-way switching, timers and ladder logic, all at low voltage, finished with a start/stop station and an emergency stop you wire yourself. Open the course Level 3 ### Go deeper Signals and filters, a CPU from gates and a board of your own. 7 lessons · 4 h ### AC, signals and filters Advanced, after Transistors and op-amps for real: sine, peak and RMS, reading a scope, RC and RL filters, frequency response, RLC resonance and active filters. Open the course 23 lessons · 16 h ### From gates to a computer Start with one NAND gate, package every circuit you build into a chip, and use your chips to build the next one: an adder, memory, a CPU of your own, and a computer that runs your program. Open the course 6 lessons · 3 h ### Breadboard to PCB Take three working circuits from the breadboard to a finished board: the schematic, footprints, placement, routing, design rules, and what a board house needs. Open the course Level 4 ### Expert Switching power and a full design from requirement to board. 7 lessons · 4 h ### Power electronics Advanced: switches, inductors and heat: buck and boost converters from loose parts, PWM, MOSFET drivers, H bridges, efficiency, and a regulated supply you set from its formula. Open the course 7 lessons · 4 h ### Circuit design capstone Expert: take one product from a written requirement to a tested board: blocks, a schematic worked out on paper, part choice, simulating the corners, PCB layout, a test plan, and a revision that fixes what the tests found. Open the course Outcomes ## What you will be able to do - Use Ohm's law, dividers and RC time constants to choose real part values. - Bias a transistor, set an op-amp's gain and build comparators and filters. - Design a supply with a rectifier, a regulator or a boost converter, and charge a LiPo safely. - Build logic from NAND gates up to an ALU, memory and a CPU, and lay out a PCB. Careers ## Where this track leads The jobs these skills are used in every day, with what each one does and how to get there. Career ### Electronics technician Test, repair and build circuit boards and the gear they live in. See the career Career ### Electrician Wire homes and factories safely: circuits, relays, contactors and motor control. See the career Career ### Electrical and hardware engineer Design the circuits and boards that new products are made of. See the career Career ### Robotics and automation technician Build, wire, program and fix the robots and machines in real factories. See the career Topics ## Looking for something specific? Each of these starts you on the right course and lesson for one subject. Digital logic ### A digital logic course, from gates to memory to a CPU Gates as real chips, a latch that remembers, flip-flops that count and a shift register, then adders, an ALU, RAM and a CPU built from one NAND gate. Start here Analog electronics ### Transistors and op-amps, for real The diode curve, biasing a BJT, common-emitter gain, MOSFETs as switches and resistors, op-amp amplifiers, comparators with hysteresis and split supplies. Start here Signals and filters ### AC, signals and filters you can see on a scope Sine, peak and RMS, reading a scope, RC low-pass, high-pass and band-pass, frequency response, RLC resonance and active filters. Start here Power supply design ### Power supply design: from the wall to a battery pack Rectifiers and smoothing, linear regulators, a boost converter, LiPo charging and a battery gauge, each one measured on simulated meters. Start here PCB design ### Learn PCB design: from a working breadboard to Gerbers The schematic, footprints, placement, routing, design rules and the Gerbers and BOM a board house needs, on three circuits that already work. Start here Test equipment ### The multimeter, the oscilloscope and the logic analyzer, on real faults Volts across and amps through, the power-off checks, PWM and bounce on a scope, a logic probe and analyzer, then one circuit with three bugs. Start here Electrician training ### Electrician training online: the circuit skills, free Practice the electrical theory part of the trade: Ohm's law with a real meter, series and parallel, relays, rectifiers and the power-off checks, in a simulator. Start here For programmers ### Electronics for programmers You already think in state, timing and interfaces. This route maps them onto current, voltage, pull-ups and buses, with code you can read on a simulator that shows each wire. Start here Questions ## About the electrical track Can I learn electronics online for free? Yes. Every course in this track is free and runs in your browser, with a circuit simulator that measures voltages and currents the way a real meter and scope would. Do I need math to learn electronics? Only arithmetic to start. Ohm's law is one multiplication, and the lessons show the numbers on a meter as you go. The later courses use a little algebra for gain and filters, explained when it comes up. Is this the same as an electrical engineering degree? No, but it covers the circuits a first and second year of one does, hands-on, so it is good preparation for a degree, a technician job or your own projects. Do I need parts or a kit? No. Every circuit is built on a simulated breadboard. When you want to build one for real, the same parts and wiring work on a bench. Tracks ## The other tracks 7 courses, 56 lessons, about 41 hours ### Coding track Python and C++ from your first print to classes, tests and state machines. Every program runs on a simulated board, so a bug is something you can see. See the track 16 courses, 126 lessons, about 97 hours ### Embedded track Arduino, ESP32, Raspberry Pi Pico and STM32: pins, timing, buses, motors, WiFi, registers and debugging, every lesson checked on a simulated board. See the track 21 courses, 141 lessons, about 98 hours ### Maker track Follow the starter kit you already own, then build a claw machine, a balance bot, a handheld console or an LED cube, each a short course checked by the simulator. See the track 15 courses, 107 lessons, about 82 hours ### Robotics track Motors, servos, sensors and PID control loops, then a rover, a claw machine and a balance bot, every lesson checked on a simulated board. See the track