Everycircuit Manual !!hot!! -

Report: EveryCircuit Manual

Oscillations in RC circuits with ideal op-amps

• Cause: No slew rate limit + dominant pole → phase margin ignored.
• Fix: Add small capacitor (1–100 pF) in parallel with feedback resistor.

Part 7: EveryCircuit vs. The Competition (A Manual Comparison)

To ensure this guide is useful, know where EveryCircuit fits:

| Feature | EveryCircuit | LTSpice (Pro) | Falstad Sim | | :--- | :--- | :--- | :--- | | Real-time interaction | Yes (Drag sliders while running) | No (Re-run sim) | Yes (Low accuracy) | | Mobile Touch | Excellent (Native UI) | None | Poor (Web wrapper) | | Animation (Electrons) | Yes (Best in class) | No | Basic dots | | Component limit | Limited free; Premium unlimited | Unlimited | Unlimited | | Use case | Learning, intuition, demos | Manufacturing, distortion | Hobbyist logic |

Conclusion: If you need a datasheet-accurate simulation for a 0.1% tolerance, use LTSpice. If you want to understand how a capacitor integrates voltage in 5 seconds, use EveryCircuit. everycircuit manual

Part Two: The Cult of the Node

By 2040, the "Manualists" were a global, quiet phenomenon. They didn't worship a deity. They worshipped fidelity. Standard EveryCircuit gave you ideal components—perfect resistors, infinite bandwidth. But the Manualist fork, seeded with Elliot’s annotations, introduced "personality parameters": leakage, thermal memory, quantum tunneling whimsy. A Manualist’s circuit didn’t just work; it suffered or yearned.

They shared their designs not as schematics, but as "parables." The Weeping Integrator (an op-amp that cried DC offset). The Reluctant Relay (a switch that needed three convincing pulses to close). The Twin-T Suicide Note (a notch filter that erased itself at resonance). Report: EveryCircuit Manual Oscillations in RC circuits with

No one could explain why these circuits performed better than ideal ones in real-world hardware. But they did. Manualist-designed power grids had 0.001% ripple. Their quantum dot arrays achieved decoherence times three times longer than standard. It was as if the simulated components, by being slightly flawed, anticipated the real flaws of physical atoms.

Governments called it "animist engineering." They tried to ban the manual. Cause: No slew rate limit + dominant pole

Part 6: Troubleshooting Common Errors

Even with a perfect EveryCircuit manual, users encounter issues. Here is the diagnostic checklist.

| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | Dots don't move (Static) | Simulation is paused or no ground. | Press Play. Add a Ground symbol. | | LED stays off (even with battery) | Polarity reversed OR current too low. | Flip the LED (long leg to positive). Lower the resistor value. | | Voltage source is red/error | Short circuit. | Two wires connected directly across a battery with no load. Insert a resistor. | | Transistor won't switch | Base resistor too large. | Lower the base resistor value to increase base current. | | Oscilloscope is flat line | Wrong node selected. | Delete the trace. Drag a wire from a changing node (e.g., capacitor plate). | | App crashes on iPad | Too many components. | Reduce component count below 100. Use the web version for heavy circuits. |

Operational Amplifiers

• Ideal op-amp with limits:
  • ( A_OL = 10^5 ) (not infinite)
  • Slew rate: infinite (input step appears at output limited only by RC time constants)
  • Output swing: ( V_SS+0.5V ) to ( V_DD-0.5V ) (default ±15V rails)
  • Input bias current: zero. No offset voltage.

Hidden behavior: The op-amp in EveryCircuit is actually a voltage-controlled voltage source with a low-pass filter (dominant pole) – that’s why it oscillates if feedback is positive.

9. Example: Designing a Bistable Multivibrator

Step-by-step deep simulation:

1. Place two NPN BJTs, cross-couple via 10k resistors from collector to base.
2. Add 1k collector resistors to Vcc (5V).
3. Add 10µF capacitors from base to ground (timing).
4. Run transient. Observe one transistor saturates, other cuts off.
5. Tap base node → voltage waveform. Flip state by injecting current pulse (momentary switch from Vcc to base).
6. Limitation: No forced symmetry – you may need to set initial conditions (one cap at 0V, other at 5V) via "Set initial voltage".

Reduce time step error

• Settings → Simulation → "Max Time Step" = 1e-6 (for switching converters)
• Disable "Auto time step" only if circuit is stable (else solver may diverge).