Tag Archives: Switch

Over Current Protection Switch

Current_Sense_Switch_IMG_4786

Current Sensing Switch is designed to operate a Relay Contact when there is a DC current through the sense resistor exceeds the set point, Set point adjustable from 1A to 3Amp using on board potentiometer. This circuit can offer over current protection to your project.

Specifications

  • Input: 12 VDC
  • Range: 1 to 3 A selectable with onboard preset
  • Output: SPDT Relay (Normally Open & Normally Closed)
  • Power Battery Terminal (PBT) and Terminal Pins for easy connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 52 mm x 47 mm

Over Current Protection Switch – [Link]

High-band DPD Demodulator with Integrated DSA and RF Switch

The IDTF1370 is a digital pre-distortion demodulator (DPD) for power amplifiers linearization in BTS transmitter that utilize the IDT zero-distortion, and glitch-free technology that offers customers an unparalleled high-performance DPD demodulator. It utilizes the technique called pre-distortion, in digital communication it is used to improve the linearity of the transmitter performance by pre-distorting a data to counteract the distortion inherent in the power amplifier. The F1370 has an RF channel range of 1300-2900MHz, it’s IF frequency ranges 20-500MHz, a typical gain of 12.5dB, +41dBm IP3o, and a High/Low side injection. The device features an integrated DPD IC for MIMO, which eliminates the need for external IF amps, baluns, switches, and DSAs thus reduce solution cost and space significantly. It has a reduction of greater that 1-Watt power consumption compared to conventional solutions.

The device has an RF input, standby mode and attenuator setting may be set using the F1370 serial port input. It has a built-in digital step attenuator (DSA) and single-pole-double-throw switches (SP2Ts). The signal coming out of the power amplifier is receive so that the I&Q (In-phase and Quadrature) data at the Baseband can be pre-distorted before being sent to the transmitter’s digital-to-analog converter to counteract the distortion inherent in the downstream PA. The signal coupled from the PA is adjusted via a DSA to a lower level and then sub-sampled at an IF frequency of ~200 MHz which necessitates the need for a highly linear demodulator to downmix to quadrature IF from the Transmit frequency. Sampling IF_I and IF_Q independently and then digitally combining these signals can achieve an effective doubling of the sample rate. Any distortion in this path will degrade the performance of the DPD algorithm. By utilizing an ultra-linear demodulator with integrated DSA such as the IDT F1370, the ACLR and/or power consumption of the full Transmitter system can be improved significantly.

The F1370 is typically used in base station transmitter and receiver for digital pre-distortion demodulator. It is also applicable in industrial, test and measurement, broadband CATV, microwave, and wireless infrastructure and distributed antenna system.

High-band DPD Demodulator with Integrated DSA and RF Switch  – [Link]

Isolated Digital ON/OFF Switch for AC load

AC_Load_Switch_M011

ON/OFF AC load Controller project offers simple On/Off Switch Control with two tact switch.

Specifications

  • Input supply – 12 VDC @ 40 mA
  • Output – upto 500 W – 230 VAC
  • Onboard tactile switch for ON/OFF control
  • Opto-isolated Triac based design
  • Power-On LED indicator
  • Power Battery Terminal (PBT) and Terminal pins for easy input / output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 44 mm x 86 mm

Isolated Digital ON/OFF Switch for AC load – [Link]

Power ON Delay Switch

Power_ON_Delay_IMG

Power-ON Delay Switch which can be used in all applications requiring a delay during power-on from 1 to 60 seconds.

Specifications

  • Supply input 5 VDC
  • Relay output SPDT relay
  • Relay specification 5 A @ 250 VAC
  • Preset adjustable range function
  • Power-On LED indicator
  • Screw terminal connector for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 44 mm x 42 mm

Power ON Delay Switch – [Link]

Adding a USB power port to a switch for IoT

IMG_20151112_241802200-624x351

Jesus Echavarria @ jechavarria.com has tipped us with his latest project. In this project he adds a USB power port to a switch.

Also I need a power supply for the Arduino board, and I think that, better than a external USB AC wall adaptor or power supply, is modify the switch to add it a USB power port that can power the Arduino board. I’ve got at home a TP-Link TL-SF1008D, a simple 8 port 10/100 Mbps switch. So, let’s go to open it and add it the USB port!

Adding a USB power port to a switch for IoT – [Link]

ESP8266 – 5$ internet connected switch

FYB89BIIGV4G950.LARGE

EasyIoT @ instructables.com shows us how to build an Internet connected switch using ESP8266 Wifi module and EasyIoT Cloud service.

In this tutorial we will show how to build WiFi internet connected switch connected to EasyIoT Cloud. We will use ESP8266, solid state relay and Arduino IDE. Switch can be controlled by WEB application, native Android application or button.

This internet switch is “plug and play” – it will automatically set all EasyIoT Cloud settings, so no configuration in EasyIoT Cloud is needed.

ESP8266 – 5$ internet connected switch  – [Link]

Light and Dark Sensitive Switch

Light_Switch_Photo

Light / Dark Sensitive Switch project is a simple project which operates a relay when the light falling on the LDR goes below or goes above a set point.

  • Input – 12 V @ 50 mA
  • Relay output – SPDT relay
  • 2-in-1 kit, either as light sensitive kit or dark sensitive switch
  • Onboard preset to set the level
  • Power-On LED indicator
  • Relay On LED indicator
  • Power Battery Terminal (PBT) for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 50 mm x 54 mm

Light and Dark Sensitive Switch – [Link]

4 Channel Triac Board

4-CHANNEL-TRAIC-BOARD-PIC01

Opto-Isolated 4-Channel Triac Board (R) is used for fast switching applications. Ideal for switching mains circuits, lights, appliances and small load. Each circuit is effectively isolated with opto-isolators on each channel, TTL inputs control each channel.

  • Trigger input 2-12 VDC
  • Mains supply input 230 VAC or 110 VAC
  • Output 1 A @ 230 VAC (RMS ON STATE CURREN 4 AMPS EACH CHANNEL)
  • Snubber circuit for inductive load
  • Jumper for common cathode ground
  • Box Header connector for connection of control signal
  • Screw terminal connector for Load
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 139 mm x 73 mm

4 Channel Triac Board – [Link]

High Reliability, High Isolation Single-Pole-Double-Throw RF switch

In telecommunications, ideal RF switches require low insertion loss, high isolation and linearity. The IDT F2912 is a single-pole-double throw RF switch capable of having low insertion of loss of 0.4dB at 1GHz and a RF1 to RF2 Isolation of 74dB at 1GHz with extended temperature of -55C to +125C making it highly reliable. In addition, this covers a broad frequency range from 300kHz to 8000MHz.

As a switch, it’s capable of 3 types of controls namely switch control, mode control, and logic control. The switch control includes (3 states and 2-pin control input) or (2 states and 1-pin control input). The 3 states and 2-pin control input operates like a XOR logic gate, if there is a high value input from the control pin either CTL1/CTL2 will trigger RF1 to RF Com if CTL1 is High or RF2 to RF Com if CTL2 is High. While the 2 states and 1-pin control input, a high value CTL2 will trigger RF2 to RF com and a low value CTL2 triggers RF1 to RF Com leaving the CTL1 a “don’t care”. The mode control use either (2-pi

n control: CTL1 and CTL2) or (1-pin control: CTL2). When RF1 and RF2 ports are both open (State 1), all 3 RF ports are terminated to an internal 50Ω termination resistor. When RF1 or RF2 port is open (State 2 or State 3 OFF condition), the open port is connected to an internal 50Ω termination resistor. When RF1 or RF2 port is closed (State 2 or State 3 ON condition), the closed port is connected to the RF Com port. The logic control operates using logic voltage 1.8V and 3.3V to operate logic CTL (pin18) VCC and GND respectively.

This circuit design can be applied more on base station 2G, 3G, 4G, portable wireless, repeaters and E911 systems, digital pre-distortion point to point infrastructure, public safety infrastructure WIMAX receivers and transmitters, military systems, JTRS radios, RFID handheld and portable readers, cable Infrastructure, wireless LAN, test/ ATE Equipment.

High Reliability, High Isolation Single-Pole-Double-Throw RF switch – [Link]

4×1 WiFi Wireless Antenna Switch

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Horacio Bouzas published a 4 way WiFi antenna switch:

I started playing with electronics back when I was 10 years old in Argentina, where I grew up. Then I got my ham radio operator license when I was 16 years old and I was very active in the ham club and on the air. It was then when I built my first vacuum tube transmitter and refurbished and old receiver (also vacuum tubes) that somebody from the club was throwing away. My interest for science and electronics grew and I ended studying physics but always tinkered with electronics, whenever I could.

I’ve moved a lot around the world for work (oil and gas) so my dedication to ham radio pretty much faded away. But it came back! Just recently, I got my ham radio operator license back and started to get active on 2mtr and on digital.

Due to lack of space outdoors, I had to settle for installing my center fed dipole on the attic (I have a long attic), but I quickly realized I needed more than 1 antenna. 80 mtr, 40 mtr, 20mtr….

And I didn’t want to run multiple lines to the attic, so an antenna switch was necessary.

4×1 WiFi Wireless Antenna Switch – [Link]