IR Remote Control | Electronic Project Circuits

Posts Tagged ‘IR remote control’

Infra Red Extender Mark 4

An Infra Red wired Repeater circuit to control appliances from a remote location.
The signal emitted by an IR remote control contains two parts, the control pulses and a modulated carrier wave. The control pulses are used to modulate the carrier, a popular modulation frequency being 36 and 42KHz. The signal is radiated by an IR diode, typical wavelengths in the 850 and 950 nm region of the electromagnetic spectrum. Although this light is invisible to the human eye, it can be seen as a bright spot with a camcorder or digital camera.

Read More Source:Andy Collinson
http://www.mitedu.freeserve.co.uk/Circuits/Interface/irext4.htm
Thank you.

Be the first to comment - What do you think? Posted by admin - April 21, 2008 at 10:24 am

Categories: Electronic Control, Lighting Tags: infrared circuit, IR remote control, Lighting

Infra Red Remote Control Extender by CA3140

This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance in another room.

The receiver is built around a silicon photodiode, the SFH2030 available from Maplin, order code CY90X. This photodiode is very sensitive and will respond to a wide spectral range of IR frequencies. There is a small amount of infra red in direct sunlight, so make sure that the diode does not pick up direct sunlight. If this happens, LED1 will be constantly lit. There is a version of the SFH2030 that has a daylight filter built in, the SFH2030F order code CY91Y. A TIL100 will also give good results here. A photodiode produces minute pulses of current when exposed to infra red radiation. This current (around 1uA with the SFH2030 and a typical IR control used at a distance of 1 meter) is amplified by the CA3140 opamp. This is configured as a differential amplifier and will produce an output of about 1 volt per uA of input current. The photodiode, can be placed up to a meter or so away from the circuit. Screened cable is not necessary, as common mode signals (noise) will be rejected. It is essential to use a MOSFET input type here as there is zero output offset and negligible input offset current. A 741 or LF351 can not be used in this circuit. The output from the opamp is amplified by the BC337 operating in common emitter mode. As a MOSFET opamp IC is used, its quiescent voltage output is zero and this transistor and both LED’s will not be lit.

Read More Source: Circuit : Andy Collinson

http://www.mitedu.freeserve.co.uk/Circuits/Interface/irext.htm

Thank you.

Be the first to comment - What do you think? Posted by admin - April 10, 2008 at 4:11 pm

Categories: Electronic Control Tags: Electronic Control, infrared circuit, IR remote control

IR Remote Control Extender by 4049

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.
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.

Read More Source: Circuit : Andy Collinson
http://www.mitedu.freeserve.co.uk/Circuits/Interface/irext2.htm