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Infrared Repeater System circuit – Circuit Schematic
Infrared Repeater System circuit
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 ca....
IR Music Transmitter and Reciever – Circuit Schematic
IR Music Transmitter and Reciever
Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitte...
High Quality Intercom – Circuit Schematic
High Quality Intercom
A very high quality intercom, which may also be used for room monitoring...
Frequency Shift Keying (FSK) Encoding and Decoding – Circuit Schematic
Frequency Shift Keying (FSK) Encoding and Decoding
The meaning of Frequency Shift Keying (FSK) is transmitting digital data over a signal path (two wires, telephone lines, AM or FM transmitter). Typically, there...
FSK Demodulator – Circuit Schematic
FSK Demodulator
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....
Analog Signal Transmission Through DC Supply Line – Circuit Schematic
Analog Signal Transmission Through DC Supply Line
If the sensor system need an active supply, we can use only a single pair of cable to carry both the power supply and the output signal. Not only simplify the....
9-Pin RS232 Line Booster Signal Flow Direction Schematic – Circuit Schematic
9-Pin RS232 Line Booster Signal Flow Direction Schematic
Herein is the scematic picture of 9-Pin RS232 Line Booster Signal Direction. This device is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries ...
USB Free Space Communicator – Circuit Schematic
USB Free Space Communicator
During my optical communications course, I had an idea to form a free space communication link between two PCs using LASER. We are supposed to submit a mini pro...
intercom schematic – Circuit Schematic
intercom schematic
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Reverse engineering the Elco heating protocol – Circuit Schematic
Reverse engineering the Elco heating protocol
First step is always to look around on the internet. After some searching, I found out that the QAA75-sensor is actually made by Siemens. This broadened my sear...
simple ir transmitter circuit – Circuit Schematic
simple ir transmitter circuit
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Isolated RS422 Interface circuit – Circuit Schematic
Isolated RS422 Interface circuit
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GSM SMS Controller using Bluetooth cellular phone and Bt serial circuit – Circuit Schematic
GSM SMS Controller using Bluetooth cellular phone and Bt serial circuit
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Dual cable (serial + USB) for Nikon coolpixes – Circuit Schematic
Dual cable (serial + USB) for Nikon coolpixes
To assure that USB and serial segments are electrically isolated, we used an optocoupler (U1). The LED section of U1 is driven directly by DTR, so we should sel...
rs232 to rs485 circuit – Circuit Schematic
rs232 to rs485 circuit
The new archetypal of RS485 advocate overcomes the RTS controlled botheration accomplished by our chargeless design. However, to do that requires a microprocess...
RC5 Protocol Decoding with 8051 – Circuit Schematic
RC5 Protocol Decoding with 8051
Infrared light is electromagnetic radiation with longer wavelengths than those of visible light. Infrared light is used in industrial, scientific, and medical a...
Electroluminescent Receiver Kit Includes – Circuit Schematic
Electroluminescent Receiver Kit Includes
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Simple RS 232 Level Converter – Circuit Schematic
Simple RS 232 Level Converter
When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
F232 is USB powered – Circuit Schematic
F232 is USB powered
F232 is USB powered, but you need to have a level translator at the output of F232. Tx of f232 has to be converted to RS232 levels, since the other side has a m...
Universal Video Interface Circuit – Circuit Schematic
Universal Video Interface Circuit
This combination sync stripper and universal video interface can solve a lot of problems for you, including Super-Nintcndo-to-anything interfacing, video overl...