Description:
This is an improved IR remote control extender circuit. It has high noise immunity, is resistant to ambient
and reflected light and has an increased range from remote control to the extender circuit of about 7
meters. It should work with any domestic apparatus that use 36-38kHz for the IR carrier frequency. Please
note that this is NOT compatible with some satellite receivers that use 115KHz as a carrier frequency.
Circuit diagram
Notes:
The main difference between this version and the previous circuit, is that this design uses a commercially
available Infra Red module. This module, part number IR1 is available from Harrison Electronics in the UK.
The IR module contains a built in photo diode, amplifier circuit and buffer and decoder. It is centerd on the
common 38kHz carrier frequency that most IR controls use. The module removes most of the carrier
allowing decoded pulses to pass to the appliance. Domestic TV's and VCR's use extra filtering is used to
completely remove the carrier. The IR1 is packaged in a small aluminium case, the connections viewed
from underneath are shown below:
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