Infrared circuits
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Crystal Controlled 38 kHz IR Transmitter
Mar 14th
This is a precision 38 kHz Infrared transmitter using MOS integrated circuit uPD 6121.It uses the NEC transmission format ideally suited for remote operation in TV, VCD Player etc. The NEC transmission format includes leader codes, custom codes (16 bits), and data codes (16 bits).The frequency of oscillation is determined by the Crystal. The IR LEDs connected to the output emits IR pulses at 38kHz.The circuit is ideal for most IR Sensors since these are designed for 38 kHz pulsed IR rays IC uPD 6121 Datasheet
Light Emitting Diode How it Works?
Feb 16th
LEDs form an inevitable part in the modern electronics as simple indicators to optical communication devices. Light Emitting Diodes exploit the property of the p-n junction to emit photons when it is forward biased. LEDs are specially made diodes to emit light when a potential is applied to its anode and cathode. (more…)
Infrared Repeater System
Feb 2nd
This infrared repeater system is used to extend the range of an infrared transmitter used at an audio or video equipment at 10 m. The original signal is captured by the infrared receiver (figure 1), amplified and delivered to the IR transmitter (figure 2) through a coaxial cable. Its is possible to control an audio system located in the living room from the dining room so it can be used as an infrared remote repeater. (more…)
Optical devices – How they work
Jan 27th
Electronic optical devices have varied applications in telecommunication, military services, medical field and in automated control systems. Solid state devices like sensors, IR and laser emitters are widely used in these applications. Optoelectronic devices use the energy from the sunlight to activate or inhibit electronic circuits. Check out how they work (more…)
Infrared Transmitter
Jan 14th
This infrared transmitter can be used with this infrared receiver. This transmitter uses impulse modulation. The modulated signal is produced by comparison of an audio signal with a triangle signal of high frequency using a comparator IC. An appropriate triangle signal generator must have the offset equal with half of the 5V power supply voltage and the triangular signal size is 2.5V. Check out the infrared alarm circuit too. (more…)
Infrared Receiver
Jan 14th
This infrared receiver is used with this infrared transmitter. The output signal of D1 IR diode is amplified by IC1. The diode is BPW41N works great with the transmitter and is relatively fast (~200 ns). The impulses at IC1’s output are applied to IC2 (comparator) that separate them from ambient light. Check out the infrared alarm circuit too. (more…)
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