CircuitLab's Profile

BJT current mirror PUBLIC

Two NPN bipolar transistors form a current mirror.

by CircuitLab | updated June 07, 2017

analog   bjt   translinear  

BJT Cascoded Active-load Differential Amplifier with CMFB PUBLIC

10 BJTs and an op-amp provide a gain of almost +70dB and about 16kHz bandwidth. A cascoded active load provides high-impedance load for the emitter-coupled pair.

by CircuitLab | updated June 07, 2017

amplifier   analog   bjt   cascode   feedback  

BJT audio amplifier PUBLIC

A one-transistor amplifier, intended to amplify audio picked up by a piezoelectric transducer.

by CircuitLab | updated June 07, 2017

amplifier   audio   bjt   filter   frequency-domain   high-pass   low-pass  

7805 & Wall-wart Experiencing Voltage Drop-out PUBLIC

A 7805 linear voltage regulator can't quite maintain its output voltage. Can you fix it?

by CircuitLab | updated June 07, 2017

power-supply   transformer   voltage-regulator  

555 Timer as Pulse Width Modulation (PWM) Generator PUBLIC

A 555 Timer can be used with variable "control" input to create a pulse width modulation (PWM) generator with its digital duty cycle varying based on an analog input voltage.

by CircuitLab | updated June 07, 2017

555   pwm  

555 Timer as Astable Multivibrator (Oscillator) PUBLIC

A 555 timer can be used with a few resistors and a capacitor to make an oscillator, switching states as the capacitor charges and discharges.

by CircuitLab | updated June 07, 2017

555   oscillator   time-constant  

Welcome to CircuitLab PUBLIC

A quick demo for new CircuitLab users.

by CircuitLab | updated May 10, 2017

Improved Wire Colors and Thicknesses PUBLIC

by CircuitLab | updated January 04, 2017

Capacitively Loaded Emitter Follower PUBLIC

An emitter follower is supposed to have its output voltage follow changes in its input approximately 1 to 1, but fast input edges and a capacitively loaded output lead to undesired and asymmetric...

by CircuitLab | updated April 13, 2012

bjt   emitter-follower   time-constant  

TL431 Shunt Voltage Regulator - Simple Behavioral Model PUBLIC

As a demo of behavioral voltage and current sources in CircuitLab, here's a simple model of the TL431 adjustable shunt voltage regulator.

by CircuitLab | updated April 13, 2012

behavioral   voltage-regulator  

Diode Cascade Voltage Multiplier PUBLIC

An AC waveform into a collection of diodes and capacitors can create a high-voltage DC supply.

by CircuitLab | updated February 04, 2012

ac-to-dc   diode   high-voltage  

AC Power Supply (Transformer and Bridge Rectifier) PUBLIC

An AC source, a transformer, and a bridge rectifier (full diode bridge) can turn an AC "wall" source into a usable DC source for low-voltage electronics.

by CircuitLab | updated February 04, 2012

ac-to-dc   bridge-rectifier   power-supply   transformer