An electronics lab bench that opens in your browser
Draw with real schematic symbols, press Run and measure on a two-channel oscilloscope with probes and ground clips. It works on lab computers and on phones, with nothing to install.
- Nothing to install
- Free, no credit card
- ANSI / IEEE schematic symbols
One lab round, from symbol to waveform
Each step below works like the editor. Try them: type a value, move R1, take a ground clip off.
Draw
Draw with the symbols from your textbook
Pick parts from the library and drop them on a canvas that snaps to the grid. Type each value the way it is printed on the part.
Try the value field: type a resistor value the way it is printed on the part.
Passive · Sources
- Function generator
- Resistor
- Capacitor
- Ground
Run
Change a value while it runs
Move R1 and the scope follows at once: C1 charges faster or slower, and the cursor at t = τ moves with it. The capacitor keeps its charge, as it would on a real bench.
The traces on this page are drawn from the RC formula. In the editor, the simulation draws them.
CH1 2 V/divCH2 2 V/div500 µs/div
CH2 at t = τ = 1 ms: 3.16 V, which is 63.2 % of 5 V
Measure
Forgot the ground clip? The scope tells you.
In the lab, a probe without its ground clip gives a reading nobody can explain. Here the scope says what is missing instead of drawing a mystery line. Try it: take the CH2 clip off.
CH2 connected: it shows the voltage across C1.
CH1 2 V/divCH2 2 V/div500 µs/div
CH2 at t = τ = 1 ms: 3.16 V, which is 63.2 % of 5 V
Instruments that work like the ones on the bench
Connect them on the canvas with probes or leads, and they read the circuit while it runs. The readings below are for the RC circuit above.
Two-channel oscilloscope
Probes with ground clips, CH1 yellow and CH2 cyan, as on a lab scope.
- DC, AC and GND coupling
- Auto, Normal and Single trigger
- Two cursors and Autoset
- Vpp, Vrms, mean, frequency and period
CH1 2 V/divCH2 2 V/div500 µs/div
- CH1 Vpp
- 5 V
- Frequency
- 50 Hz
- Period
- 20 ms
Bode plotter
Sweeps the frequency and draws gain and phase, so a filter's cutoff is a point you read off the curve.
−3 dB at 159 Hz
Voltmeter and ammeter
Clip a voltmeter across a part or put an ammeter in series. The reading sits on the symbol.
- 3.16 VAcross C1 at t = τ
- 1.84 mAThrough R1 at t = τ
Safe limits
Each part with a rating shows its live value next to the rating, and warns before a real part would get hot.
- R1 power (peak)25 mW / 250 mW · Safe
- C1 voltage5 V / 50 V · Safe
Also in the editor
- Build sheet and Bill of Materials (BOM) as PDF or PNG
- Share a circuit by link, view only
- Undo and redo for every edit
- Command palette (Ctrl/Cmd+K) and keyboard shortcuts
- Bahasa Indonesia and English, switch any time
- On a phone, tap a part, then tap the canvas to place it
Every part in the library
23 parts in 6 drawers, the same list as the library in the editor. Pick one to see its symbol and what it does.
Passive 4
Diodes 3
Transistors & ICs 5
Sources 4
Switches 3
Instruments 4
Passive
Resistor
Limits current, V = IR
Start free. Paid plans come later.
The free plan is the only plan today. Every instrument and export is in it; the limit is how many projects you keep.
Students and hobbyists
For students, teachers and makers who learn by building.
Free
- 1 personal workspace
- Up to 2 projects
- Oscilloscope, function generator and meters
- Safe limits checked while the circuit runs
- Build sheet and Bill of Materials export (PDF / PNG)
- Share a circuit by link
Sign in with Google. No credit card.
Coming later
- For engineersComing soon
More workspaces and projects, and revision history for each circuit.
- For schoolsComing soon
Classes and assignments, so teachers can hand out circuits and check the results.
These plans are not open yet, and there is no waiting list.