diode Archives

PC817 High-Speed Optocoupler Working and Characteristics

August 2, 2025March 25, 2022 by Gul Faraz

High-speed-optocoupler-as-zero-cross-detector.

PC817 High-speed optocoupler is an electricity-light-electricity conversion device used for electrical signal transmission with light as the medium

How to Choose Capacitor Value to Filter Power Supply Noise?

August 2, 2025April 1, 2021 by Gul Faraz

learn how to Choose Capacitor Value to Filter Power Supply noise reduction. The basic parameters for choosing a capacitor are voltage, frequency, temperature, and polarization.

PIN Photodiode: Working, Circuit, Types, Sensitivity, and Uses

August 6, 2025January 21, 2021 by Gul Faraz

Photodiodes is a semiconductor device that operates in reverse bias. The photodiode has a small opening on the top for light entering the light and energizes the PN junction

Explain BJT Transistor construction and working principle

February 25, 2026March 21, 2020 by Gul Faraz

Transistor construction, symbol and equivalent circuit

Explain the working principle and construction of BJT Transistor and Symbol. A transistor can work as digital switch or an amplifier.

Zener Voltage Pass Regulator Explained with Example

October 31, 2026November 1, 2019 by Gul Faraz

A Zener Diode is a special purpose diode used for voltage regulation in reverse bias. Zener diode work under breakdown region for typical operation. A minimum current of Zener knee current must be maintained to keep the voltage regulated.

Derivation of Diode Current Equation, Calculator, and Example

October 14, 2026September 4, 2019 by Gul Faraz

The diode current equation depends on the dark saturation current, the charge of an electron, and external voltage. We also provide a calculator for the diode current equation.

3 Methods of testing a diode with multimeter and oscilloscope

March 2, 2026August 15, 2019 by Gul Faraz

Testing a diode with a digital multimeter in two ways, diode testing portion, and ohmmeter. A diode test is considered passed if it shows low resistance/voltage drop on forward bias and high resistance/voltage drop in reverse bias. A diode curve tracer uses an oscilloscope for VI characteristics graph.

Diode Voltage Doubler Circuit with Tripler and Quadrupler

February 18, 2026August 9, 2019 by Gul Faraz

Voltage Multipliers are electric circuits to increase the voltage by a factor of two, three or four in case of Voltage Doubler, Tripler or Quarple respectively. The Voltage multiplier circuit uses capacitors and resistors to enhance the voltage level.

Full Wave Bridge Rectifier with Capacitor Filter Design

September 20, 2025June 3, 2019 by Gul Faraz

full bridge rectifier current flow during positive half cycle

The Bridge type full wave rectifier can convert an AC to DC by the mean of four diodes in such configuration that the output peak voltage remains equal to secondary of transformer peak. In each half cycle, a set of two diodes conduct and block the current alternately.

Center Tapped Full Wave Rectifier with Capacitor Filter

February 25, 2026March 10, 2019 by Gul Faraz

A center tapped rectifier converts AC voltage to a DC voltage by the means of center tap transformer and two diodes. The output DC voltage of the rectifier is half of the secondary voltage.