CircuitLab's Profile

Digital 4-bit counter and DAC PUBLIC

A four-bit digital counter is implemented with discrete digital logic and registers. Those four bits are fed into an op-amp based digital-to-analog converter (DAC).

by CircuitLab | updated February 08, 2021

dac   digital   op-amp  

RC vs. RL Step Response PUBLIC

by CircuitLab | updated August 17, 2020

RC vs. RL Frequency Response PUBLIC

by CircuitLab | updated August 17, 2020

Mechanical spring dashpot Laplace model PUBLIC

CircuitLab can be used to model some mechanical systems as well.

by CircuitLab | updated August 17, 2020

feedback   laplace   mechanical  

Zener diode voltage reference PUBLIC

A Zener diode provides controlled reverse breakdown, and can act as a fixed voltage reference.

by CircuitLab | updated June 08, 2017

voltage-regulator   zener-diode  

Resistors in series and parallel PUBLIC

CircuitLab has no problem simulating big circuits of resistors, voltage sources, and current sources.

by CircuitLab | updated June 08, 2017

parallel   series  

RLC resonance PUBLIC

A square wave into a resistor, inductor, and capacitor can produce ringing and narrowband amplification

by CircuitLab | updated June 08, 2017

frequency-domain   resonance   rf  

Op-amp non-inverting amplifier PUBLIC

Two resistors plus an op-amp form a gain-of-10 amplifier.

by CircuitLab | updated June 08, 2017

amplifier   op-amp  

Op-amp inverting amplifier PUBLIC

Two resistors plus an op-amp form a gain-of-10 (inverted) amplifier.

by CircuitLab | updated June 08, 2017

amplifier   op-amp  

MOSFET switching inductive loads PUBLIC

A n-channel MOSFET switches an inductive load, both with and without a diode to catch the voltage spike.

by CircuitLab | updated June 08, 2017

diode   flyback   inductive   mosfet   motor   power   relay  

MOSFET (CMOS) NOR gate PUBLIC

Two n-channel MOSFETs and two complementary p-channel MOSFETs form a two-input CMOS NOR logic gate.

by CircuitLab | updated June 08, 2017

cmos   digital   mosfet  

MOSFET (CMOS) NAND gate PUBLIC

Two n-channel MOSFETs and two complementary p-channel MOSFETs form a two-input CMOS NAND logic gate.

by CircuitLab | updated June 08, 2017

cmos   digital   mosfet  

MOSFET and resistor NOR gate PUBLIC

Two n-channel MOSFETs plus one pull-up resistor form a two-input NOR logic gate.

by CircuitLab | updated June 08, 2017

digital   mosfet   pull-up  

MOSFET and resistor NAND gate PUBLIC

Two n-channel MOSFETs plus one pull-up resistor form a two-input NAND logic gate.

by CircuitLab | updated June 08, 2017

digital   mosfet   pull-up  

JFET-based electret microphone amplifier PUBLIC

Most electret microphone modules today come with a built-in JFET to help provide a low-impedance output and noise resistance, but these must be biased properly.

by CircuitLab | updated June 08, 2017

amplifier   audio   bias-point   jfet  

LEDs with resistor biasing PUBLIC

LEDs are usually found with a resistor in series to select the desired current (and therefore brightness and power consumption).

by CircuitLab | updated June 07, 2017

bias-point   current-limiting   led  

Laplace transform step response and Bode plot PUBLIC

CircuitLab can also handle arbitrary Laplace transform functions, and can produce step response plots in the time domain and Bode plots in the frequency domain.

by CircuitLab | updated June 07, 2017

bode   laplace  

Diode turn-off time PUBLIC

Diodes can take a surprisingly long time to turn off, as we show in this demo.

by CircuitLab | updated June 07, 2017

diode   switching  

Diode full-wave rectifier PUBLIC

Four diodes (a "bridge rectifier") plus a capacitor can be used to rectify AC into DC, with conduction over most of the the input power cycle.

by CircuitLab | updated June 07, 2017

ac-to-dc   bridge-rectifier   diode   time-constant  

Diode half-wave rectifier PUBLIC

A single diode plus a capacitor can be used to rectify AC into DC, but often with a lot of ripple at the output.

by CircuitLab | updated June 07, 2017

ac-to-dc   diode   time-constant