Relay Drivers

This is an over-current trip switch. It provides protection to a load when over current condition occurs. Basically, the project trips the relay when there is a short circuit or the load starts drawing much current. When the condition is favorable, press the tactile switch to power the load again. The threshold voltage of the comparator is 0.6V, the over-current limit can be adjusted using the trimmer Potentiometer PR1. Operating supply 12V DC @ 80mA when the relay is ON, load supply 0V to 48V.

This RC Relay project enables control of large current devices using a Radio Control (RC) System. This RC switch converts hobby radio control (RC) pulses to control the on/off state of the Relay. On board LED indicates the output. The board is Arduino compatible and the example code can be modified as per user requirements.  The relay ON/OFF threshold can be set as per user requirements. The Arduino sample code enables momentary ON/OFF control of the relay, but this can be modified for Latch output. The relay can handle a load up to 7A – 30V DC or 7 Amps 230AC Loads such as bulbs, LEDs, motors, fans, heaters etc. The project can be connected to an unused RC channel. It operates with 5V DC and draws 60mA current when the relay is ON. 3 Pin male header helps the user to connect the RC receiver. The project is Arduino compatible and can be programmed using Arduino IDE with the help of an onboard programming connector. The project consists of an Atmega328 microcontroller, programming/bootloader connector, relay, BC847 BJT transistor to drive the relay, freewheel diode for protection from the relay, and U2 PC817 provides isolation between the microcontroller and relay. D1 LED indicates output, D3 LED power LED. connector CN2 relay switch connection, connector CN1 5V supply input.

This is an SPI Interface multichannel relay board for high voltage AC or low voltage DC loads. It is ideal for controlling LEDs lights, coffee machines, fans, pumps, or other high-voltage electrical appliances. The board also breaks out the SPI header, so controlling other boards is still possible. Each relay can handle current up to 7A @ 250V AC/30V DC. This 8 x channel board is mainly designed for AC loads, but it can also drive DC loads, screw terminals on each channel enable the easy interface of the AC load, and each point is marked as AC-Live and AC Neutral. Refer to the connection diagram for the interface. The project consists of 8 x 12V relays with load capacity 7A @ 250V AC, ULN2803 8 channel relay driver, 74HC595 SPI to 8 output, 5V regulator 7805, power LED, screw terminals for loads and AC input, header connector for SPI input and output.

2 channel Relay driver project can be controlled by feeding 2-12V trigger voltage, Very useful project for application like Micro-Controller based projects, Remote controller, Lamp on Off, and any circuits which required isolated high current and high voltage switching by applying any TTL or CMOS level voltage. Two LED works as operation indicator while in , 3 pins screw terminals to connect load and provides  both normally open and normally closed switching.

This is a large current Relay module with single pole double throw switch which provides normally closed and normally open operations. The Relay is the most common used module in application such as home automation, industrial automation, and machine on/off. Sometimes you need to control large current such as the fans, lights, water heaters, room heaters, Air-conditioning, vacuum pumps That is what this Large Current Relay Module can be helpful to drive such high current load with just TTL signal. Easy interface with embedded systems and micro-controllers.

4 Channel Relay Board is a simple and convenient way to interface 4 relays for switching application in your project. Very compact design that can fit in small area, mainly this board is made for low voltage applications.

This is a Smart Dual Coil Latching Relay that can control the ON/OFF power of a device by applying a short voltage pulse to Input 1 and Input 2. This project is helpful in low-power applications since the coil is not powered all the time, it only requires a short voltage pulse. Relay Coil also remains in that position even if the power is disconnected. Polarized, bi-stable, latching relays are utilized in many kinds of electronic equipment and diverse applications. These relays usually employ two coils, one to move the relay contacts(s) from the open to close position and another coil to move the contacts(s) from the close to the open position.  to facilitate mechanical movement, the relay coils need to be energized for a specific time interval. Once the contact(s) have changed position, the voltage should be removed from the winding of the relay. As shown in the schematic, a dual-coil relay is connected to its supply rail at the center point of the two relay windings Each winding can be energized by applying a TTL-short pulse to input A1, A2, B1, and B2. Diode D6, D7, D8, and D9 are used as clamping diodes. Operation is very simple, apply a minimum 150mS-500mS trigger voltage to input A1/B1, this will energize relay coil -1 and the coil moves contact(s) open to close, and when the pulse applies to input A2/B2, coil-2 energized and moves the contact(s) from close to open. All inputs can be triggered using push switches, Arduino/microcontroller and other circuits, applying 150mS to 500mS TTL pulse will energize the coil.