Free electronic circuit design and schematic diagram
This is a digital isolation and termination circuit. This circuit uses The CLT3-4 that is a digital termination device with quadruple input. The CLT3-4 is designed for 24 V DC automation applications. The CLT3-4 drives an isolating opto-coupler and gives the front-end circuitry of a digital input module (I/O) in industrial automation. Here is the circuit: This circuit has a […]
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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 circuit diagram below is a simple RS-485 circuit. Full-duplex communications (simultaneous transmission and reception) with only two essential packages (IC2 and IC3) is provided by this circuit. For high-noise environments or for long-distance transmission between a computer and it’s peripherals, the simple RS-485 balanced and differential data lines are necessary. Such transmission are difficult, if possible, using the single-ended […]
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This is a protocol translator circuit. This circuit uses the MAX3162, it contains both RS-485 and RS-232 transmitters and receivers. This IC contains wide range of communication devices, that can convert bidirectionally between RS-485 and RS-232 signals. Here is the circuit : The upper circuit is the translator for point to point application, and the lower is for multipoint application. […]
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A split-phase data signal consists of a series of binary digits that occur at a periodic rate, as shown in waveform A in the timing chart. The weight of each bit, 0 or 1, is random, but the duration of each bit and, therefore, the periodic bit rate, essentially is constant. A clock that is synchronized with the data bit […]
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This FSK demodulator convert the FSK signal to serial digital signal. FSK modulation is used to transmit digital serial data, and we need to demodulate it to get back the digital data at the receiver. Here is the schematic diagram of the circuit: This demodulator circuit uses 2225/2025 Hz for mark/space coding, and this frequency is the answering frequency of […]
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