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Simple IR Transmitter

Simple IR Transmitter
Simple IR Transmitter
This circuit uses just two standard logic ICs which, with the accompanying receiver, forms a four-channel remote control and has been designed for use with the ‘Audio/Video Switch’ and the ‘Switchbox for Loudspeakers’ (shown elsewhere in this issue, as is the IR Rreceiver).Each pushbutton is connected to an input of a shift register (4021), which is clocked by a binary counter/oscillator (74HC4060). A cycle is started via one of the diodes connected to each pushbutton and a differentiator-network (C1/R4), creating a short pulse that is fed to the shift register and counter/oscillator.
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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Component list

Resistors:
R1 = 4-way SIL array 1MOhm
R2 = 270kOhm
R3 = 5kOhm 6
R4 = 100kOhm
R5 = 3kOhm 3
R6 = 22Ohm
P1 = 2kOhm 5 preset H
Capacitors:
C1 = 100pF
C2 = 1nF2, MKT
C3,C4 = 100nF ceramic
C5 = 47µF 25V axial (lead pitch 12.7 mm)
Semiconductors:
D1-D5 = BAT85
D6 = LD271
T1 = BC639
T2 = BC640
IC1 = 4021
IC2 = 74HC4060
Miscellaneous:
JP1,JP2,JP3 = 3-way pinheader with jumper
S1-S4 = pushbutton, 1 make contact, PCB mount,e.g., D6-Q-BK-SWITCH + D6Q-BK-CAP (ITT/Schadow)
BT1 = 2 x mini penlite battery (AAA) with holder
Enclosure, e.g., Conrad Electronics #52 28 64-24 (dim. 101x60x26 mm)

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