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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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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.

R1 = 4-way SIL array 1MOhm
R2 = 270kOhm
R3 = 5kOhm 6
R4 = 100kOhm
R5 = 3kOhm 3
R6 = 22Ohm
P1 = 2kOhm 5 preset H
C1 = 100pF
C2 = 1nF2, MKT
C3,C4 = 100nF ceramic
C5 = 47µF 25V axial (lead pitch 12.7 mm)
D1-D5 = BAT85
D6 = LD271
T1 = BC639
T2 = BC640
IC1 = 4021
IC2 = 74HC4060
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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