CircuitLab's Profile

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  

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  

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  

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  

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  

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 current mirror PUBLIC

Two NPN bipolar transistors form a current mirror.

by CircuitLab | updated June 07, 2017

analog   bjt   translinear  

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  

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  

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  

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  

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  

Improved Wire Colors and Thicknesses PUBLIC

by CircuitLab | updated January 04, 2017

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  

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  

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  

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  

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 (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