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

mrobbins's Public Circuits:

Now showing circuits 21-40 of 76. Sort by

Behavioral Source - Exponential Envelope Decay

Behavioral Source - Exponential Envelope Decay PUBLIC

Sinusoidal source modulated with exponentially-decaying envelope.

by mrobbins | updated July 28, 2013

Back-to-back Diodes (1sec transient)

Back-to-back Diodes (1sec transient) PUBLIC

Proper simulator convergence in back-to-back 1N4148 diode transient simulation. (with longer time duration transient simulation)

by mrobbins | updated July 25, 2013

Back-to-back Diodes

Back-to-back Diodes PUBLIC

Proper simulator convergence in back-to-back 1N4148 diode transient simulation.

by mrobbins | updated July 16, 2013

diode  

Robox's Multi-AC source - Loop gain / return ratio

Robox's Multi-AC source - Loop gain / return ratio PUBLIC

CircuitLab can calculate "return ratio" or "loop gain" to show when a dependent source can create an unstable system.

by mrobbins | updated December 20, 2012

feedback  

Robox's Multi-AC Source Question

Robox's Multi-AC Source Question PUBLIC

CircuitLab supports multiple AC input sources for frequency domain analysis.

by mrobbins | updated December 20, 2012

feedback  

Physics: Car Suspension pt. 1 (Spring, Mass, Damper)

Physics: Car Suspension pt. 1 (Spring, Mass, Damper) PUBLIC

A model of a simple spring-mass-damper system with a driven wall. Time domain and frequency domain simulations included.

by mrobbins | updated September 10, 2012

laplace   mechanical  

Precision Active Peak Detector

Precision Active Peak Detector PUBLIC

An op-amp plus diode form a "precision" active peak detector, where the op-amp eliminates the diode drop that would otherwise occur with a passive peak detector.

by mrobbins | updated August 03, 2012

active-filter   diode   op-amp   signal  

P-MOSFET Buck Converter (Switching Power Supply)

P-MOSFET Buck Converter (Switching Power Supply) PUBLIC

A simple buck converter model that simulates.

by mrobbins | updated August 02, 2012

power-supply   switching  

Exclusive OR (XOR) Equivalent Circuit

Exclusive OR (XOR) Equivalent Circuit PUBLIC

XOR gate depicted in sum-of-products representation (composed from OR, AND, NOT gates).

by mrobbins | updated July 23, 2012

digital  

Op-amp low-pass/high-pass analysis

Op-amp low-pass/high-pass analysis PUBLIC

Understanding op-amp filters with poles and zeros.

by mrobbins | updated July 13, 2012

active-filter   op-amp  

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