Circuit Design & Simulation vs DENDOU

Take circuits off the page: draw them, power them up, then build them by hand. SCHEMATIC • Standard symbols: resistors, capacitors, diodes, LEDs, Zener diodes, transistors, relays, switches, motors, buzzers, sensors, logic gates, op-amps, 555 timers and more • Choose IEC or ANSI (US) symbol style • Snap-to-grid wiring; rotate, flip and swap parts in a tap; Apple Pencil support • Color themes and art styles; export crisp images of your schematic SIMULATION • Turn a schematic into a working simulation in one tap. A checklist points out missing values and wiring problems one by one • Moving green dots show current; blue numbers show the voltage at each node • Flip switches, press buttons, turn potentiometers, change light and temperature, and the circuit responds instantly • Watch capacitors charge and discharge, transistors amplify and switch, relays latch, logic gates oscillate and 555 timers count down • Oscilloscope for waveforms; record the current animation and export it as a GIF BREADBOARD • Realistic breadboard, battery box, components and chips: follow the schematic and plug them in step by step • Or build freely, picking parts from the parts list • Power it up to check your work: does the lamp light, does the motor turn? • Analog and digital multimeters measure voltage, current and resistance EXAMPLES 12 complete examples: basic circuit, capacitor charge and discharge, rectifier with filter and regulator, sensors and transistors, Darlington pair, transistor latch, three-person voting circuit, logic-gate oscillator, relay motor reversing, op-amp oscillator, 555 oscillator and 555 timer. Each comes as a schematic, a simulation and a breadboard, and you can change anything. To keep your changes, save it as your own circuit. EVERYDAY USE • Syncs between iPad and iPhone through iCloud • Share a link and anyone can open your circuit in a web browser • No sign-up, no ads, no personal data collected • English and Chinese Great for physics and technology classes, electronics hobbyists and makers, and teachers demonstrating in class. MEMBERSHIP Free forever: drawing and exporting schematics, plus everything in the 12 examples (including their simulations and breadboards). Membership unlocks: simulating circuits you draw yourself, the breadboard for your own circuits, and art styles. • Yearly membership: auto-renewing subscription, billed yearly • Lifetime membership: one-time purchase Both support Family Sharing. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the end of the period. Manage or cancel in Settings → Apple Account → Subscriptions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://saviteachingassistant.cn/circuit/privacy-en.html

DENDOU is an electric-circuit simulator that lets you build a circuit, switch it on and see the current flow. Place batteries, bulbs, resistors, LEDs, switches, ammeters and voltmeters on the screen and connect them with wires. The current flows as glowing yellow particles and bulbs light up according to their power. Components use the standard circuit symbols found in textbooks. Tap a switch to turn it on and off, or move a slider to change a value, and voltage, current and power update immediately. WHO IT IS FOR - Students learning Ohm's law, series and parallel circuits and Kirchhoff's laws - Anyone preparing for electrician or electrical-engineering exams - Teachers and parents who want to show how circuits behave - Beginners in electronics building their first LED circuit CONNECT, RUN, WATCH Pick a component in the palette and tap the screen to place it. In Wire mode, tap one terminal and then another to draw a wire. Press play: the speed of the particles shows how large the current is and their direction shows which way it flows. In Run mode, tap a switch to turn it on or off, or tap a component to see its voltage, current and power. CHANGE VALUES LIVE Double-tap a component to open its sliders. Change a voltage, a resistance or an LED's forward voltage and the circuit is solved again on the spot. "What happens to the current if I double the resistance?" takes one second to try. LEARN FROM MISTAKES A short circuit, sources with different voltages in parallel, or an LED burning out above 50 mA are reported together with the component that caused them. A reversed LED stays dark, and an LED with too little voltage stays dark, just like the real thing. Deleted something by mistake? Use Undo. AC TOO (PRO) With an AC source, capacitors and inductors you can analyze AC circuits: RMS values, phase, active, reactive and apparent power, power factor, and the voltage and current waveforms. Build classic exam problems such as RL impedance or series resonance and check the answers. ANSWERS THAT MATCH THE TEXTBOOK The engine solves circuits with modified nodal analysis (MNA) and is checked by more than 100 automated tests based on school and exam problems, so its results match the theory. FEATURES - 12 components: battery, bulb, resistor, LED, switch, wire, ammeter, voltmeter, ground, AC source (Pro), capacitor (Pro), inductor (Pro) - Standard circuit symbols; long-press to rotate, drag to move, pinch to zoom - Measurement panel with a summary of the whole circuit - 7 sample circuits, a tutorial and a guide - Save and load circuits (Free: 1 slot, Pro: 5 slots) - Available in 74 languages, following your device language FREE AND PRO Free: 9 DC components (including the voltmeter and the bulb), up to 8 components per circuit, 1 save slot, with ads. Pro (one-time in-app purchase): the AC source, capacitor and inductor and the AC sample circuits, unlimited components, 5 save slots, no ads. Pro is not a subscription and supports Family Sharing. If you already bought it, tap "Go Pro" in the toolbar and choose "Restore purchase". PRIVACY No account is needed and your circuits stay on your device. The Free version shows ads, so the ad network (Google AdMob) receives data such as an advertising identifier. Ads are personalized only if you allow tracking in the system prompt shown at first launch, and you can change this at any time under "?" > "Ad settings". See the privacy policy for details.