Hardware Secrets
Home | Camera | Case | CE | Cooling | CPU | Input | Memory | Mobile | Motherboard | Networking | Power | Storage | Video | Other
First Look
Gabriel’s Blog
Main Menu
About Us
Awarded Products
Manufacturer Finder
RSS Feed
Test Your Skills
Subscribe today!
IrDA Principles and Protocols: The IrDA Library, Vol. 1
IrDA Principles and Protocols: The IrDA Library, Vol. 1, by Jeffrey M. Brown (MCL Press), starting at $0.71

Home » Motherboard
Building an Infrared Transmitter for Your PC
Author: Gabriel Torres 269,672 views
Type: Tutorials Last Updated: May 9, 2006
Page: 2 of 2
The Circuit

You will have to buy two 2N4041 or any general purpose NPN transistor (BC548, for example), a 10 nF capacitor (a.k.a. 0.01 uF), a 4K7 resistor (yellow, purple, red), a 47 K resistor (yellow, purple, orange), a 15K resistor (brown, green, orange), a 22 ohm resistor (red, red, black) and a 1 K resistor (brown, black, red) (all of them 1/8 W or 1/4 W). As for the infrared LED and the infrared photo-diode, use Radio Shack 276-142. All these components can be bought at Radio Shack.

Infrared device schematics

Figure 4: Infrared device schematics.

When assembling the circuit, the only special care you will need is to make the transmitter (LED) and receiver (photo-diode) become perfectly aligned, side by side, as shown in Figure 1.

After assembling the circuit, you will have to connect it to the motherboard IR connector. Notice that we have marked four points in the circuit: Vcc, Gnd, TX and RX. These points should be connected to the corresponding points in the motherboard IR connector.

It is also important that you configure the IR interface to operate in full-duplex mode at the motherboard setup to achieve higher performance.

After the device is connected, it should be automatically recognized by Windows, and it will show an infrared icon on the task bar near the clock (lower right corner). As soon as you approach your cellphone, handheld or notebook infrared sensor to the device you build, Windows will alert you that it found another computer nearby, allowing you to transfer files between the device and your PC.

Print Version | Send to Friend | Bookmark Article « Previous |  Page 2 of 2

Related Content
  • Forgotten Motherboard Functions

  • RSSLatest Content
    ASRock Z97 Anniversary Motherboard
    December 16, 2014 - 4:27 AM
    Gigabyte H81M-S2PH Motherboard
    December 12, 2014 - 3:05 AM
    Aerocool Dead Silence Case Review
    December 2, 2014 - 3:00 AM
    NZXT S340 Case Review
    November 27, 2014 - 3:45 AM
    AMD A4-5000 CPU Review
    November 26, 2014 - 3:10 AM
    Samsung Galaxy Note Pro 12.2 Tablet Review
    November 25, 2014 - 3:00 AM
    ASUS X99-PRO Motherboard
    November 5, 2014 - 3:00 AM
    ASRock QC5000-ITX Motherboard
    November 4, 2014 - 3:00 AM
    Gigabyte X99-UD3 Motherboard
    October 30, 2014 - 8:30 AM

    2004-14, Hardware Secrets, LLC. All rights reserved.
    Advertising | Legal Information | Privacy Policy
    All times are Pacific Standard Time (PST, GMT -08:00)