Username mrobbins
Name Mike Robbins
E-mail
Member Since September 23, 2011

mrobbins's Public Circuits:

Now showing circuits 21-40 of 66. Sort by

Current source proportional to time

Current source proportional to time PUBLIC

A current source can source a current proportional to the current simulation time in transient analysis mode.

by mrobbins | updated July 12, 2012

behavioral  

Piecewise-linear Diode (Behavioral Sources)

Piecewise-linear Diode (Behavioral Sources) PUBLIC

A behavioral current source can be used to model an "ideal" piecewise-linear diode, conducting in one direction but not the other.

by mrobbins | updated July 12, 2012

behavioral   device-modeling   diode  

2N3906 Switching Performance

2N3906 Switching Performance PUBLIC

Switching (saturation turn-on/turn-off) times for 2N3906 PNP BJT.

by mrobbins | updated July 02, 2012

bjt  

Three stage RC inverter ring oscillator

Three stage RC inverter ring oscillator PUBLIC

Three inverter stages in a ring, with RC for delay, create an oscillator.

by mrobbins | updated June 22, 2012

oscillator   time-constant  

Rendering 16,000+ Circuits in the Cloud

Rendering 16,000+ Circuits in the Cloud PUBLIC

Illustration for a CircuitLab blog post.

by mrobbins | updated June 20, 2012

Dots Demo

Dots Demo PUBLIC

Demo of the new connection dots in the CircuitLab renderer.

by mrobbins | updated June 11, 2012

Sallen-Key Filter -- Op-amp Circuit Input Impedance

Sallen-Key Filter -- Op-amp Circuit Input Impedance PUBLIC

Shows how to calculate the input impedance of an op-amp circuit, in this case a Sallen-Key filter.

by mrobbins | updated May 15, 2012

active-filter   op-amp  

Renen's Blue LED (2.7V, 20mA)

Renen's Blue LED (2.7V, 20mA) PUBLIC

Attempting to model a blue high-intensity LED which draws about 20mA at 2.7V bias.

by mrobbins | updated April 20, 2012

device-modeling   diode   led  

Two LEDs: separate vs shared resistor

Two LEDs: separate vs shared resistor PUBLIC

Two LEDs driven by a shared vs separate resistors -- how does current split if the two LEDs are slightly different?

by mrobbins | updated April 05, 2012

diode   led  

BJT PWM -- multi-stage rise/fall times

BJT PWM -- multi-stage rise/fall times PUBLIC

Power BJTs can be used to switch lots of current, but they require lots of base current as well.

by mrobbins | updated March 28, 2012

bjt   power   pwm  

Revision of clabaccchio's "Rectifier"

Revision of clabaccchio's "Rectifier" PUBLIC

Op-amp and diode rectifier.

by mrobbins | updated March 28, 2012

diode   op-amp  

Digital Input Hysteresis ("Schmitt Trigger" behavior)

Digital Input Hysteresis ("Schmitt Trigger" behavior) PUBLIC

All digital element inputs in CircuitLab currently show hysteresis effects (VIL=2.0, VIH=3.0).

by mrobbins | updated March 22, 2012

digital   hysteresis   schmitt-trigger  

Diode Reverse Recovery Time Demo

Diode Reverse Recovery Time Demo PUBLIC

Diodes have a "reverse recovery time". When switched from on to off, the space charge within the semiconductor must return to its original location. The diode appears to conduct briefly in reverse.

by mrobbins | updated March 20, 2012

diode   flyback   switching  

Diode tester

Diode tester PUBLIC

by mrobbins | updated March 19, 2012

diode  

Copy of jpeg2600's "p. 287 #43"

Copy of jpeg2600's "p. 287 #43" PUBLIC

Demo of graphically solving a KCL/KVL/resistor problem using parameter sweep.

by mrobbins | updated March 16, 2012

CircuitLab as an In-Browser Graphing Calculator

CircuitLab as an In-Browser Graphing Calculator PUBLIC

CircuitLab's graphing and expression evaluation abilities make it possible to use as a general-purpose in-browser graphing calculator.

by mrobbins | updated March 14, 2012

Loop of voltage sources

Loop of voltage sources PUBLIC

Loops of ideal voltage sources can cause simulator issues.

by mrobbins | updated March 10, 2012

TL431-like shunt voltage regulator

TL431-like shunt voltage regulator PUBLIC

BJT, op-amp, and internal reference voltage source make a model of a shunt voltage regulator

by mrobbins | updated March 06, 2012

bjt   op-amp   voltage-regulator  

LED / photodiode with optical connection by CCCS

LED / photodiode with optical connection by CCCS PUBLIC

A CCCS (Current Controlled Current Source) can be used to simulate the optical coupling between an LED and photodiode.

by mrobbins | updated March 01, 2012

led   optical   photodiode  

Copy of danielfiction's 555 motor controller ($0.50!)

Copy of danielfiction's 555 motor controller ($0.50!) PUBLIC

Build a PWM motor controller for $0.50! Based on danielfiction's circuit (link inside).

by mrobbins | updated March 01, 2012

555   bjt   motor   pwm