The circuit board is completely open source under GPL license and is provided on GitHub as Eagle CAD and Gerber files at this repository.
It is also available for order.
Most of the parts you will need are available from Adafruit. Some that are not available at Adafruit are available from a variety of suppliers. At the end of this list will give you a complete parts list from Digi-Key.
First, we will need 2 IR LEDs. We prefer to use a combination of wide-angle and narrow-angle LEDs. This narrow 20° angle LED is available from Adafruit. A 40° wide-angle LED is available from Digi-Key. See the Digi-Key parts list at the end.
You will also need an NPN transistor and 2 PNP transistors. Here Adafruit has a combo pack of five of each or you can buy them separately in packs of 10.
You will need a 1K ohm resistor and optionally you may need two 33 ohm resistors. Adafruit carries the 1K variety but if you need the 33 ohm see the Digi-Key parts list at the end of the page. We will explain later why you may or may not need the 33 ohm resistors.
You will need an infrared receiver such as this TSOP38238 from Adafruit. In the Digi-Key parts list we specify TSOP38438 which has a slightly better automatic gain control circuit however the 38238 from Adafruit will work fine under most every circumstance. You may also need an infrared learner device the TSMP 58000 from Digi-Key. We will explain later why you might need a TSMP58000.
Here is a complete parts list from Digi-Key.
- 1 -- IR333C/H0/L10 IR LED 40° angle from Digi-Key
- 1 -- IR333A 20° angle from Digi-Key
- 1 -- 1k ohm resistor from Digi-Key
- 2 -- 33 ohm resistors from Digi-Key
- 1 -- PN2222 NPN transistor TO-92 case from Digi-Key
- 2 -- PN2709 PNP transistor TO-92 case from Digi-Key
- 1 -- TSOP 38438 38 kHz IR receiver module from Digi-Key
- 1 -- TSMP 58000 IR learner module from Digi-Key