What you can do on the bench

Drag real parts onto the mat and wire them. A nodal solver (modified nodal analysis with Newton iteration) works out every voltage and current as the circuit runs.
Parts behave like the real thing: resistors and wires heat up, fuses and breakers trip, LEDs and transistors burn out when they are overdriven, and batteries charge and drain at their real capacity.
Measure with a multimeter, clamp meter, oscilloscope, function generator, LCR meter and electronic load.
Program an ESP32 or Arduino in C++ and watch the code drive the circuit: GPIO, PWM, ADC, I²C, SPI, UART, interrupts, deep sleep, Wi-Fi and LTE.
Design solar systems with solar charge controllers modelled on real products (EPEVER LandStar and Tracer, Renogy Wanderer, Victron SmartSolar), hybrid and grid-tie inverters, LiFePO4 and Li-ion packs with BMS boards.
Build it for real: solder a perfboard by hand, then lay the circuit out on a printed circuit board, route copper traces on two layers with vias and a ground pour, check it with a design-rule check and run the board on the same solver.
Wire a house: breakers, RCD, switches, outlets, junction boxes, energy meters and conductor sizing.
Where it is switched on, ask the AI instructor to explain a circuit, check your wiring or build something for you.

Courses

Zen’s Electronics Design Mastery

Personal track · about 60 hours

Design and build connected, solar-powered electronics, from Ohm’s law to an IoT capstone.

DC Fundamentals
DC Circuit Analysis
Capacitors, Inductors & Time
AC & Reactance
Diodes & Power Supplies
Transistors
Op-Amps & Analog ICs
Digital Electronics
Microcontrollers & Embedded
Capstone — Connected Tracker
Fabrication — Perfboard & PCB

Electronics Fundamentals

Starter · about 10 hours · for hobbyists and first-year students

Use a multimeter safely, predict voltages and currents in simple circuits, and wire LEDs, batteries and switches correctly.

Voltage, current and resistance
Series and parallel
Batteries and cells
Diodes and LEDs
Capacitors and time
AC basics
Switching with transistors

Electronics Technician

Technician · about 30 hours · for repair and installation technicians

Measure, test components, build and repair power supplies and control circuits, and find faults methodically.

Measuring and safety
Components and testing
Power supplies
Transistor circuits
Op-amps and timers
Batteries, chargers and USB
Digital and logic levels

Electronics Engineering

Engineering · about 45 hours · for ee and ece students

Analyse linear networks, design filters, amplifiers and oscillators, and confirm designs with frequency-response and sweep tools.

Circuit analysis
Network theorems
Transients
AC and phasors
Filters and frequency response
Diodes and supplies
Transistor amplifiers
Op-amps and feedback
Oscillators and timing
Digital systems

Solar PV Systems

Practitioner · about 12 hours · for pv installers and off-grid owners

Size, wire, protect, ground, commission and troubleshoot a solar system to PEC/NEC 690, and prove it on the bench: three graded exams aligned to the NC-II PV Systems Installation units.

1 · PV basics
2 · The IV and PV curves
3 · Irradiance and temperature
4 · Array configuration and the string window
5 · Shading, bypass and blocking diodes
6 · Charge controllers: PWM and MPPT
7 · Batteries and charging
8 · Inverters and topologies
9 · Wiring, fuses and voltage drop
10 · Grounding, bonding and surge protection
11 · System sizing
12 · Commissioning and troubleshooting
13 · Economics
14 · Code and safety

Embedded & IoT

Intermediate · about 20 hours · for makers

Write ESP32 sketches that read sensors, drive actuators, survive faults, sleep on batteries and report to the cloud.

First sketches
Buses and sensors
Actuators
Reliability
Power for battery devices
Connectivity

Electronic Components, One Build at a Time

Starter · about 6 hours · for complete beginners

Know the fourteen components every circuit is made of: read them, test them with a meter, and use each one, ending with a solar-powered automatic light you built yourself.

Passive parts: R, switch, pot, diode, capacitor
Sensing and switching: LDR, transistor
Power and decisions: regulator, comparator
Real loads and automation: relay, PIR, 555, buzzer
Off-grid: solar, controller, battery

House Wiring Basics

Starter · about 5 hours · for homeowners, electricians starting out, nc-ii reviewers

Wire lights, switches, outlets and a panel the way the Philippine Electrical Code expects, size the breaker and the wire for each circuit, and know what an RCD does.

1 · Current, power and what a wire can carry
2 · Lights and switches
3 · Outlets and the branch circuit
4 · The panel: main breaker and branch circuits
5 · Big loads: aircon and water heater
6 · People and faults: the RCD
7 · Transformers and three-phase, briefly

Off-grid and Backup Power

Practitioner · about 8 hours · for homes with brownouts, sari-sari stores, small islands

Choose and size batteries, chargers, inverters and a UPS for a home that loses the grid, and prove the night and the outage with a test run.

1 · Cells, packs and internal resistance
2 · Charging
3 · Lead-acid against LiFePO4
4 · Building the bank
5 · Inverters and the home UPS
6 · Living through a brownout
7 · Small off-grid systems
8 · The whole system, sized and tested

Advanced PV Systems

Engineering · about 8 hours · for installers moving to grid-tie, hybrid and three-phase work

Design strings against the cold-morning window, protect and ground an array to PEC 6.90, choose between grid-tie, hybrid and AC-coupled topologies, and commission the result.

1 · Strings and the cold-morning window
2 · Shading, bypass and blocking
3 · Overcurrent protection for arrays
4 · Grounding, bonding and surge
5 · Grid-tie
6 · Hybrid and AC-coupled
7 · Three-phase
8 · Commissioning and the code

Lesson topics

193 interactive lessons and classic circuits, each with theory, live measurements against the expected values, and things to try:

DC circuits (8)
Network analysis (8)
Transients (4)
AC circuits and filters (11)
Power, transformers and three-phase (28)
Op-amps and analog ICs (19)
Oscillators (12)
Fundamentals (20)
Batteries and solar (33)
Diodes and rectifiers (9)
Transistors and thyristors (20)
Digital logic (19)
Embedded (ESP32) (25)
Systems and capstones (3)
USB and power interfaces (11)
Measurement and instruments (2)
Fabrication (3)
Embedded (Arduino) (5)
Real Devices (4)
Solar PV physics (14)

All lessons

Bench builds

66 complete gadgets with a parts list, a guided build, a test sheet with pass ranges and fault-finding practice:

Single 18650 charger with LED charge indicator — Charges one cell from USB; red while charging, blue when full.
18650 battery level indicator — Three LEDs show full, half and low.
USB power bank — 18650 charger plus protection plus a 5 V boost output.
Continuity tester — Beeps on a closed circuit.
Automatic emergency light — LED lamp turns on when mains fails, charges when it returns.
Solar garden light with dusk switch — Charges by day, lights at night.
12 V low-voltage battery cutoff — Disconnects the load before the battery is damaged.
Router DC UPS — Keeps a 12 V router running through a power cut.
Solar phone charger — Panel to USB with a buck converter.
Adjustable bench supply 1.25–20 V — 1.25–20 V with a panel meter.
555 delay-off timer with relay — Switches a load off after a set time.
PWM fan or LED dimmer — Variable brightness or speed from a knob.
Water-level indicator — LEDs show tank level through probe wires.
Motion-activated light — Lights for 30 s when someone passes.
LM386 speaker amplifier box — Small amplifier for a phone or radio.
ESP32 battery sensor node — Wakes, reads a sensor, reports, sleeps.
10,000 mAh power bank · 4 × 18650 — 10,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
20,000 mAh power bank · 8 × 18650 — 20,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
40,000 mAh power bank · 16 × 18650 — 40,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
10,000 mAh power bank · 2 × 21700 — 10,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
20,000 mAh power bank · 4 × 21700 — 20,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
40,000 mAh power bank · 8 × 21700 — 40,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
12,000 mAh LiFePO4 power bank · 2 × 32700 — 12,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
24,000 mAh LiFePO4 power bank · 4 × 32700 — 24,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
42,000 mAh LiFePO4 power bank · 7 × 32700 — 42,000 mAh, 5 V 2.4 A USB out, 2 A USB charging, full protection.
50 Ah 12 V LiFePO4 battery (4S9P, 32700 cells) with charger — 12.8 V 54 Ah (691 Wh) battery from 36 × 32700 cells, 4S BMS with balancing, 10 A CC/CV charger from mains.
100 Ah 12 V LiFePO4 battery (4S17P, 32700 cells) with charger — 12.8 V 102 Ah (1306 Wh) battery from 68 × 32700 cells, 4S BMS with balancing, 20 A CC/CV charger from mains.
Light with one switch — One 9 W LED bulb on a 1-way wall switch, fed from a 10 A breaker.
Staircase light: two 3-way switches — A 15 W lamp switched from two places with a pair of 3-way (2-way in British terms) switches.
Fan and light on a 2-gang switch — A ceiling light (9 W) and a fan (40 W), each on its own rocker of one 2-gang switch.
Outlet circuit: three outlets on a 20 A breaker — Three duplex outlets on 3.5 mm² wire and a 20 A breaker, with a TV, refrigerator, rice cooker, kettle and flat iron plugged in.
House panel: main breaker and four branch circuits — A 60 A main, four branch breakers, two switched lights, an outlet with a TV and refrigerator, a 1 HP aircon and a 3.5 kW water heater.
RCD protection: someone touches a live wire — A water-heater circuit behind a 30 mA RCD, with a switch that lets a "person" (about 1 kΩ, hand to wet feet) touch the live wire.
LILYGO T-SIM A7670E: an ESP32 and an LTE modem on one board — ESP32-WROVER-E + SIMCom A7670E LTE Cat-1 board: power-on sequence, registration, data context, BAT_ADC.
200 Ah power station from four 3.2 V prismatic LiFePO4 cells: 4S BMS, 2 × 12 V, 3 × USB, mains charger — 12.8 V 200 Ah (2560 Wh) power station from four prismatic cells with a 4S BMS, two fused 12 V outputs, three USB outputs, a watt meter and a 20 A mains charger.
200 Ah power station on a 12.8 V LiFePO4 battery: 2 × 12 V, 3 × USB, mains charger — 12.8 V 200 Ah (2560 Wh) power station on a drop-in battery, two fused 12 V outputs, three USB outputs, a watt meter and a 20 A mains charger.
65 W USB-C PD stage on a ready-made 24 V supply: buck converter, PD controller, load switch — 65 W USB-C PD charger: certified 24 V supply, buck converter, PD source controller, P-MOSFET load switch, with OCP, OVP, UVP and VBUS discharge.
65 W USB-C PD charger from scratch: mains flyback (UC3844, 800 V MOSFET, PQ2625 transformer), TL431 + PC817 feedback, PD controller — 65 W USB-C PD charger from parts: mains input filter, bridge and bulk, UC3844 flyback with RCD clamp and aux-powered VCC, TL431 + PC817 feedback, primary OVP, PD controller and load switch.
1. Resistor and LED: the first circuit — Step 1 of the automatic light: B1 (9 V) → R1 470 Ω → LED1 → back to B1. I = (9 − 2) / 470 ≈ 15 mA: bright, and well inside the LED’s 20 mA.
2. Adding a switch — Step 2 of the automatic light: SW1 goes between B1 + and R1. Off: the LED is dark and no current flows.
3. Potentiometer: a dimmer — Step 3 of the automatic light: VR1 (10 k) between the switch and R1. Knob at 0: about 15 mA. Knob at the far end: 10.47 k in total, under 1 mA, a dim glow.
4. Diode: reverse-polarity protection — Step 4 of the automatic light: D1 in the + line right after the battery. The LED gets 0.7 V less (a little dimmer); connect B1 backwards and the circuit simply stays dark, no damage.
5. Capacitor: a soft fade-out — Step 5 of the automatic light: C1 1000 µF across the supply after the switch. Switch off and the LED fades over a second or so instead of snapping off: C1 empties through VR1, R1 and the LED.
6. LDR: sensing light — Step 6 of the automatic light: R2 47 k from the supply to SENSE, LDR1 from SENSE to ground. Bright: the LDR is low, SENSE is low (well under 1 V). Dark: the LDR is high, SENSE rises to several volts. Nothing uses SENSE yet: measure it.
7. Transistor: the light switches itself — Step 7 of the automatic light: LED1 now goes to Q1’s collector instead of ground; SENSE drives the base through R3 10 k. Daylight: SENSE is low, Q1 is off, the LED is dark. Dusk: SENSE rises, Q1 conducts, the LED comes on by itself. Note how it fades in gradually at dusk: the transistor is half on. Lesson 9 fixes that.
8. Voltage regulator: a 12 V supply and a steady 5 V — Step 8 of the automatic light: The build outgrows a 9 V battery, so it moves to a 12 V adapter (D1 still guards it). U1 7805 gives 5 V for the light sensor, so the dusk level no longer drifts with the supply. R1 becomes 680 Ω for the higher voltage, and D1 becomes an SR560 Schottky (5 A, 150 A surge, about 0.4 V drop): the adapter can push tens of amps into C1 for an instant at switch-on, past a 1N4007’s 30 A surge rating, the lamp will draw 0.75 A later, and every volt lost in D1 is light lost in the lamp.
9. Comparator: a clean decision at dusk — Step 9 of the automatic light: VR1 gets a new job: it sets the dusk level on IN1− (the dimmer is gone; the LED becomes the “lamp on” indicator with R1 1 k). SENSE goes to IN1+. R4 pulls the output up to 5 V, R3 2.2 k drives Q1 hard, and R5 1 M from the output back to SENSE adds hysteresis: once on, it needs a bit more light to turn off.
10. Relay: switching a real lamp — Step 10 of the automatic light: K1’s coil sits where the LED was, between + and Q1; D2 across it. Its contacts switch a 12 V 9 W LED lamp straight from the supply. LED1 stays as the indicator next to the coil.
11. PIR sensor: only when someone is there — Step 11 of the automatic light: Q2 goes in series below Q1, its base driven by the PIR output. Now both must be on: dark (Q1) AND movement (Q2). The lamp lights only when someone walks by at night.
12. 555 timer: stay on after they pass — Step 12 of the automatic light: The PIR now drives Q2 as an inverter, pulling TRIG low while it sees movement (R8 keeps TRIG high otherwise). U3’s output drives Q3, which replaces Q2 in the AND below Q1. R9 100 k × C4 100 µF × 1.1 = 11 s: the lamp stays on 11 s after the trigger, much longer than the PIR’s own hold.
13. Buzzer: an alarm mode — Step 13 of the automatic light: Q4, driven from the same 555 output, switches BZ1 through SW2 (alarm on/off). With the alarm on, whoever trips the PIR at night gets light and a beep for the whole 11 s.
14. Solar: the light runs off-grid — Step 14 of the automatic light: The adapter is replaced by PV1 (20 W) → U5 charge controller → BAT1 12 Ah, and the light runs from the controller’s LOAD output through D1 and SW1 as before. A 9 W lamp for a total of a couple of hours of motion a night is a few Wh; one sunny day of a 20 W panel is about 80 Wh.
Home UPS on a 24 V LiFePO4 battery: charger, inverter, changeover relays, two 220 V outputs — Keeps two 220 V circuits powered through outages from a 24 V LiFePO4 battery; charges from the grid when it returns.
Home UPS on 8 × 3.2 V LiFePO4 cells + BMS: charger, inverter, changeover relays, two 220 V outputs — Keeps two 220 V circuits powered through outages from 8 × 3.2 V LiFePO4 cells; charges from the grid when it returns.
Single 18650 charger with a 3-LED charge indicator (green 80–100 %, yellow 40–79 %, red below 40 %) — Charges an 18650 from USB and shows its charge on three LEDs: green 80–100 %, yellow 40–79 %, red below 40 %.
Real device: phone charger, 220 V AC wall to 5 V USB — A USB phone charger traced from the wall to the phone, every part annotated: fuse, bridge, bulk capacitor, switching transformer, opto feedback, output capacitor.
Real device: laptop charger, 220 V AC wall to 20 V with PFC — A 65 W laptop charger traced from the wall to the laptop: the phone charger's spine at higher power, with a boost power-factor corrector in front of the bulk capacitor.
Real device: electric fan, 220 V AC to moving air — A 16-inch stand fan: a permanent-split-capacitor motor, its run capacitor, a piano-key speed switch on the winding taps and the thermal fuse buried in the winding.
Real device: water heater, 220 V AC to hot water — A 15 L storage water heater: an RCD, a bimetal thermostat, a one-shot thermal fuse and a 1500 W sheathed element. The heat is the output.
1 HP inverter aircon on a 3.6 kW hybrid at night: what the battery sees — Night-time: no sun, a 24 V 100 Ah LiFePO4 battery feeding a 3.6 kW hybrid, a 1 HP inverter aircon, a refrigerator and lights. The panel shows battery current and the hours left.
Why a 1.5 HP non-inverter aircon trips a 3 kW inverter at start-up — A 24 V LiFePO4 battery, a 3 kW pure-sine inverter and a 1.5 HP non-inverter aircon. Switch the aircon on and watch the inverter fault; swap the aircon or the inverter and it runs.
Grid-tie solar in a brownout: why the lights go out even at noon — The grid, a kWh meter and main breaker, a 3 kW grid-tie inverter on four panels, and the house loads. Switch the grid off and watch.
Sari-sari store freezer through a brownout: battery, inverter and hours — 12 V 100 Ah LiFePO4 battery, 1000 W pure-sine inverter, a chest freezer and two LED bulbs. The panel shows the compressor state, the current and the hours left.
Aircon branch circuit: 1.5 HP on 3.5 mm² and a 20 A breaker, on its own — Mains through a 20 A breaker and 3.5 mm² wire to a 1.5 HP non-inverter aircon on its own outlet. The tests share the circuit with the kitchen and swap in 2.0 mm² to see what gives.
Water heater circuit: 3.5 kW on 5.5 mm² and a 30 A breaker — Mains through a 30 A breaker and 5.5 mm² wire to a 3.5 kW storage water heater. The tests raise it to 5 kW and try the wrong wire.
Piso Wi-Fi on solar: how big a panel and battery for a router and coin box — 100 W panel, a 10 A MPPT charge controller, a 12 V 30 Ah LiFePO4 battery and the box: router plus coin acceptor on the controller’s load terminals. The panel shows the battery current and the hours left.

Parts bin

Power sources: DC adapter, DC barrel plug (bare wires), Current source, Three-phase supply, Utility grid, Variac, Isolation transformer.

Ideal elements (theory): Voltage-controlled voltage source, Voltage-controlled current source, Current-controlled voltage source, Current-controlled current source, Formula source, Ideal switch, Coupled inductors.

Schematic symbols: Net label, Ground symbol, Voltage rail.

Logic (ideal): Logic input, Logic gate, Flip-flop, Logic output.

Batteries & cells: 9 V battery, AA cell, 18650 Li-ion cell, 21700 Li-ion cell, LiFePO4 cell, LiFePO4 prismatic cell, LiFePO4 prismatic cell 50 Ah, LiFePO4 prismatic cell 105 Ah, Flat Li-ion battery, 18650 battery holder, LiFePO4 battery, Lead-acid battery, Battery pack, Battery capacity indicator, Battery monitor with shunt (coulomb counter), Low-voltage disconnect (12 V, 30 A), ER14505 lithium cell.

Charging & BMS: LiFePO4 charger, TP4056 charger module, TP5000 charger module, 1S protection board, 1S 10 A protection board, 2S BMS, 3S BMS, 3S 40 A BMS, 4S Li-ion BMS, 6S Li-ion BMS, 7S Li-ion BMS, 10S Li-ion BMS, 13S Li-ion BMS, 1S LiFePO4 protection board, 4S LiFePO4 BMS 20 A, 4S LiFePO4 BMS, 4S LiFePO4 BMS 100 A, 8S LiFePO4 BMS, 8S LiFePO4 BMS 100 A, 16S LiFePO4 BMS, 3S LiFePO4 BMS.

Solar & inverters: Solar panel, Small poly panel, Solar charge controller, Power inverter, Grid-tie inverter, Hybrid solar inverter.

Regulators & converters: Switching power supply, CC/CV buck module, 7805 regulator, LM317 / LM338 regulator, Step-down converter, USB step-down module, USB step-down module (ZCL-B53), DC UPS / ATS module, Transformer, AMS1117 regulator, 7905 negative regulator, MT3608 boost module, TPS61088 boost module, Power-bank boost module, XL6009 buck-boost module, PWM controller + gate driver, HT7333 LDO, Boost PFC stage.

Passive components: Resistor, Potentiometer, Photoresistor (LDR), Electrolytic capacitor, Supercapacitor, Film capacitor, Toroidal inductor, Ceramic capacitor, Variable capacitor, Axial choke, Ferrite bead, Quartz crystal, NTC thermistor, PTC thermistor, MOV varistor, Aged electrolytic.

Diodes & transistors: Signal diode, Schottky diode, Rectifier diode, Zener diode, Bridge rectifier, LED, LED board, SMD LED, NPN transistor, PNP transistor, N-channel MOSFET, Germanium diode, TVS diode, P-channel MOSFET, N-channel JFET, IGBT, Matched transistor pair, BSS138 N-MOSFET, 8205A dual N-MOSFET.

Thyristors: SCR (thyristor), TRIAC, DIAC, UJT (unijunction), Neon lamp.

Optoelectronics: Photodiode, Phototransistor, Optocoupler, Opto-TRIAC driver, IR LED, IR receiver, RGB LED, WS2812 LED strip.

ICs & op-amps: Op-amp, Comparator, 555 timer, LM339 quad comparator, NE5532 low-noise op-amp, TL431 reference, LM386 audio amp, ULN2003 driver, DW01 Li-ion protector, ATECC608 secure element.

Microcontrollers & modules: Arduino Uno R3, Arduino Nano, ESP32 DevKit, ESP32-S3 DevKitC-1, Raspberry Pi Pico 2, LILYGO T-SIM A7670E R2, Orange Pi One, Coin acceptor, Coin slot (₱5 only), I2C LCD, MAX7219 8-digit display, ILI9341 2.8" TFT (SPI), 1.69" IPS TFT (ST7789), OLED display (I²C), MPU-6050 IMU, BME280 environment sensor, Hobby servo, GPS module, 4G LTE module, MAX485 RS-485 module, microSD card module, DS3231 RTC module (ZS-042), L298N motor driver, DRV8833 motor driver, INA219 current sensor, ACS712 Hall current sensor, HX711 load-cell ADC, PAM8403 class-D amp, Relay module, nRF52832 BLE module, E-paper display 1.54".

Sensors: DS18B20 temperature sensor, LM35 temperature sensor, MAX6675 thermocouple module, PIR motion sensor, Ultrasonic distance sensor, Hall-effect switch, Reed switch, Soil moisture sensor, Microphone amplifier, Load cell, Water tank with probes, DHT22 temperature & humidity sensor.

Networking & PoE: 12 V Wi-Fi router, 12 V PoE router, Fiber modem (ONU), 12 V Wi-Fi access point, 5-port network switch, 8-port network switch, PoE adapter, Passive PoE injector.

Switches & protection: Fuse, Relay, Toggle switch, Changeover switch, Push button, Wall switch, AC breaker, RCD (30 mA), DC breaker, Resettable polyfuse, Stop button (NC), Contactor, Thermal flasher, Solid-state relay, Slide switch, Rotary encoder (KY-040), 4×4 keypad, Limit switch, Emergency stop, Fan speed switch, Bimetal thermostat, Thermal fuse, Hatch sealing loop, Surge protector (SPD).

Loads & appliances: Incandescent bulb, 12 V DC LED bulb, DC motor, Active buzzer, 220 V bulb, 220 V desk fan, Household appliance, Speaker, High-impedance earphone, Pilot lamp, Piezo disc (passive), Stepper motor (unipolar), Stepper motor (bipolar), Solenoid, Fluorescent lamp, Stand-fan motor (PSC), Storage water heater.

USB & power interfaces: USB charger / port, USB-to-serial adapter, USB-C PD charger, USB-C PD source controller, Synchronous buck converter IC, USB-C PD trigger + meter, Smartphone, USB-C breakout, Current-mode PWM controller, Flyback transformer, High-voltage N-MOSFET, Common-mode choke, NPN transistor, 300 V, LMR33630 buck regulator IC.

Connectors & wiring: Breadboard, Perfboard, Via, Printed circuit board, DC barrel jack, USB-A receptacle, Wall outlet, Net meter, Energy sub-meter, PZEM-004T v3.0 AC meter, Junction box (PH, PVC), Terminal junction box (EU / panel), Screw terminal block.

Digital logic: DIP switch module, Clock / pulse generator, Logic indicator LED, Logic probe, Hex display (decoded), 7-segment display, 74xx00, 74xx02, 74xx04, 74xx08, 74xx32, 74xx86, 74xx74, 74xx107, 74xx393, 74xx161, 74xx164, 74xx4511, CD4017 decade counter, 74HC595 shift register, 74HC14 Schmitt inverter.

Packaging & mounting: TO-220 heatsink, Project enclosure, DIN rail (35 mm), M3 standoff.

Instruments: Oscilloscope, Logic analyzer (8 channels), Schematic sheet, Function generator, Electronic load, DC watt meter, Clamp meter, LCR meter.

Free calculators

Community projects

Anyone can publish a circuit from the lab with a public link, an embed code for a blog or course page, and a key to update it later. Browse what others built at /projects, open a project, run it and make your own copy. The lab also imports Wokwi projects (diagram.json and the sketch) and runs the same circuit with real part limits: currents, heat, batteries.

Open the lab