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IR Transmitter with HT12E

IR Transmitter with HT12E
IR (infra-red) transmitters containing the encoder-IC HT12E from Holtek have been published in Elektor Electronics on previous occasions. The interesting aspect of this design is that the entire IR-transmitter has been squeezed into a handy key ring.The operation of the encoder IC HT12E has already been thoroughly dealt with in earlier publications. It will suffice to mention here that an address can be programmed on inputs A1 through to A8. This address has to be set the same as in the receiver.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1 = 976kOhm
R2,R4 = 10kOhm
R3 = 100kOhm
R5 = 10Ohm
Capacitors:
C1 = 100nF
C2 = 100ยต F 10V radial
C3 = 10nF
C4 = 220pF
Semiconductors:
D1 = 1N4148
D2 = IRED (e.g., LD274)
IC1 = HT12E (Holtek)
IC2 = TLC555
T1 = BC337
Miscellaneous:
S1 = miniature pushbutton (HAK)
Enclosure: KM series Box UM14
PCB, available from The PCBShop
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