Free electronic circuit design and schematic diagram
This is Infra-Red Remote Control Tester circuit. This circuit is used to test go/no-go of any remote control transmitting infra-red (IR) light. The supply of this circuit is 3V battery. This circuit has some advantages, such as fits in a compact enclosure, built from inexpensive parts and a handful of commonly available. As a quasi-analogue amplifier, this circuit uses Schmitt […]
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This is a circuit of RC5 Infrared Remote Control Transmitter. This circuit uses The PCA8521 that when a key pressed, the PCA8521 generates It generates output pulses, in accordance with the RC5 protocol. Although the IC doesn’t contain a software programmable processor, it contain a ROM which can be used to store the codes that have to be transmitted. Here […]
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This is a infrared Remote Control Decoder circuit. This circuit uses the SAA3049A which is used to check and convert the received coded data (RECS80/RC5) into latched binary outputs. We can uses several device in one location because the device address can be hard-wired for a particular address. The output of this device are the received data and address. Here […]
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The photodiode can be used to detect IR reflected from the object. However, IR produced by the ambient conditions also detected by the photodiode. This IR noise must be filtered to prevent false detections. Usually, the LED’s IR signal is modulated with a convenient frequency and then using that modulation to detect only IR to filter the IR noise. So, […]
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