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Modeling a transmission line

An ideal transmission line consists of two isolated ports, linked by a time delay. A real transmission line works similarly, but with a common mode impedance between ends; this is best simulated by ...
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4 votes

Why don't simulators work with a self-oscillating voltage booster circuit using a transformer and a transistor?

These sorts of simple self oscillating schemes rely on transformer saturation to define the on time by volt seconds applied to the winding .This is a close relative to the blocking oscillator .You ...
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Why don't simulators work with a self-oscillating voltage booster circuit using a transformer and a transistor?

It's not the simulator that's isn't working. The challenge is to accurately model your circuit: not just its connections, but also the circuit elements. Even then, simulations can bomb out when they ...
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7 votes

Why don't simulators work with a self-oscillating voltage booster circuit using a transformer and a transistor?

The transformer winding in the collector is the wrong way round. You need to swap the two connections such that when the collector goes towards ground, the base goes positive. The dots on the windings ...
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RTD Simulator vs Resistors

Assuming this is for demonstration a simulator in not needed. You can build your own by place a pot in series with a resistor where the resistor is the value of the lowest resistance you expect and ...
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RTD Simulator vs Resistors

It might seem absurd that a simulator might cost more than the RTD sensor or meter. Traceability on calibration can be expensive or complicated if you are not experienced in metrology. Also, if the ...
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RTD Simulator vs Resistors

You can use resistors (usually a decade box is used, made with precision wirewound resistors) but it's less convenient perhaps to dial in a precise resistance that corresponds to a specific ...
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plot the max slopes of Voltage-Transfer characteristics in ngspice

...
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SPICE Simulator at Linux

There is also circuitjs written in javascript which you can use online or via a standalone version here. Screenshot:
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2 votes
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Disturbance in AC adapter

Are those distortions something to be expected? If so, why? The disturbance at the top of the positive peak is fundamental to any practical rectifier and smoothing capacitor. Once the capacitor has ...
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1 vote

How to input range of current values in LT Spice

If you're referring only to your current source then what you ened is a sine with offset. So calculate it based on your maximum and minimum values, ...
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2 votes

How to input range of current values in LT Spice

I want my waveform to oscillate from 10uA to 10mA That's a peak-to-peak value of 9.99 mA or, a peak value of 4.995 mA. So, use two current sources in parallel; one set to produce a peak current of 4....
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2 votes

How to input range of current values in LT Spice

I would use a behavioral current source (bi in the components library) The amplitude could be driven by a voltage source in PWL mode : and then, the arbitrary current source (or here voltage source) ...
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Diode SPICE data accuracy at high frequencies?

You cannot extrapolate Spice data where geometric impedances affect the conductance and junction capacitance assumptions in the datasheet. "Measured at a LO frequency of 9.375 GHz, with an IF ...
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2 votes

Triple-555 timer circuit not working in Proteus

Logic toggle is supposed to be a logic input and therefore cannot be used as a power source. For any 555 models inside Proteus, if you connect GND properly but leave the VCC pin unconnected (i.e. ...
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Modelsim Altera not working

Questa (aka Modelsim) gives several compile errors on eda playground ...
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Failed to find DC operating point for AC analysis LTspice

May I direct your attention to the second graph (updated version, simulation with positive feedback). I don`t know if you are surprised about the results - because in reality such a circuit cannot and ...
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Failed to find DC operating point for AC analysis LTspice

I made some silly connections in my circuit. It works now. Thank you, everyone. *The bottom one would not work in reality.
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Failed to find DC operating point for AC analysis LTspice

Judging from the apparent topology of the circuit drawn around the opamp, I guess you are trying to make an inverting amplifier. If so, it looks like you simply connected wires wrong. The input ...
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Can anyone explain the role of some of these blocks in this PV inverter system?

1)Battery Switches Relay protection for battery Charge (Ch) and Discharge (Dch) 2)Unipolar Switching I believe it is the port for modulating the DCAC inverter with an "Amplitude modulation ...
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Can anyone explain the role of some of these blocks in this PV inverter system?

The batteries can be charged or discharged. The switching selects this. The DC rail voltage needs to be converted to the mains peak voltage and be able to vary it. This is what the flyback converter ...
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2 votes

CircuitLab DC parameter sweep problem circuit

DC sweep tries to save time and reuse results from the previous step as a "seed". Turns out this seed makes convergence worse sometimes. I've ran into this bug many times. The problems are ...
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5 votes

How to get the parameters of a ferrite bead

Normally you can model any bead with any combination of RLC parts. Since this follows the standard RLC parallel resonance at; fo ~ 110 Mhz and Zo ~ 500 ohms. Fast & easy method to get close Step 1 ...
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How to get the parameters of a ferrite bead

From an answer to an earlier question you asked is this circuit: - The values for R1, R2, L1 and C1 were taken from this ferrite bead table: - But, if all you have is the graph shown below, you can ...
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3 votes
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Ferrite bead selection and simulations for a 2.4 GHz ESP32 3V3 power line

I want to be able to filter the 3V3 power line going out of the ESP32 MCU Well, it seems to me that you have your ferrite bead in the wrong position; it should either be to the right of the 3 ...
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7 votes
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LTSpice voltage source understanding

No. Your top plot is in the frequency domain and is called a frequency Bode plot. Notice the axes. X is frequency in decades, and Y is output voltage ( somewhere on top of C1) relative to 1V in ...
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