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Relay

RC Snubber Calculator for MOSFETs, Relay Contacts and Triacs

Last Updated on June 2, 2025 by Swagatam Leave a Comment

This calculator is basically finding out two things: …so that we can make a perfect RC snubber for killing high voltage spikes across: Now let us break down everything it’s calculating. RC Snubber Calculator Application Type: MOSFETTRIACRelay Contact Peak Voltage (V): Peak Current (A): Rise Time (µs): Calculate Snubber © homemade-Circuits.com Basic Snubber Formula Logic […]

Filed Under: Voltage Control and Protection Tagged With: Calculator, Contacts, MOSFETs, RC, Relay, Snubber

How to Connect 5V Single Channel Relay Module

Last Updated on February 23, 2025 by Swagatam Leave a Comment

In this post we are talking about this handy little gadget called a 5V single-channel relay module. It is super useful for our microcontroller projects whether we are using Arduino, Raspberry Pi, or even the ESP8266/ESP32. Let us break it down together, what it is, how it works, and how we can connect it. Understanding […]

Filed Under: Timer and Delay Relay Tagged With: Channel, Connect, Module, Relay, Single

ON/OFF Relay Switch Circuit using Reflection Sensor

Last Updated on May 13, 2023 by Swagatam Leave a Comment

ON OFF switch circuit using IR reflection sensor CNY70

This 220 V ON/OFF electronic relay switch can be toggled ON/OFF simply by alternately bringing your finger close to the reflection sensor CNY70. About CNY70 CNY70 is an infrared reflecting sensor comprised of an infrared emitting diode and a phototransistor housed in a tiny plastic container. The sensor operates by generating infrared light and sensing […]

Filed Under: Sensors and Detectors Tagged With: OFF, ON, Reflection, Relay, Sensor, Switch

Temperature Controlled Relay Switch Circuit

Last Updated on January 2, 2024 by Swagatam 223 Comments

temperature controlled relay circuit

In this article I have explained a simple temperature controlled relay circuit which can be switched ON/OFF depending on the temperature on its temperature sensor. Meaning, when the temperature on its temperature sensor rises above a set threshold point, the relay switches ON, and when the temperature drops below the threshold, the relay switches OFF. […]

Filed Under: Temperature Controllers Tagged With: Controlled, Relay, Switch, Temperature

Prevent Relay Arcing using RC Snubber Circuits

Last Updated on January 2, 2024 by Swagatam 143 Comments

arc suppression compressed

In this article I have explained the formula and techniques of configuring RC circuit networks for controlling the arcing across relay contacts while switching heavy inductive loads. Arc suppression An arc is produced across the contacts when a switch or a relay is opened. With time, this condition can wear down the contacts. To overcome […]

Filed Under: Voltage Control and Protection Tagged With: Arcing, Circuits, Prevent, RC, Relay, Snubber

Solid State Relay (SSR) Circuit using MOSFETs

Last Updated on March 10, 2022 by Swagatam 198 Comments

SSR concept

SSR or Solid state relays are high power electrical switches that work without involving mechanical contacts, instead they use solid state semiconductors like MOSFETs for switching an electrical load. SSRs can be used for operating high power loads, through a small input trigger voltage with negligible current. These devices can be used for operating high […]

Filed Under: Electronics Theory Tagged With: MOSFETs, Relay, Solid, SSR, State

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