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Video Clock and Message Generator – Circuit Schematic
Video Clock and Message Generator
This circuit allows you to superimpose a title and/or the time and sate on an incoming video signal - very useful when editing video tapes. It`s also a good int...
Simple pulse position modulation circuit – Circuit Schematic
Simple pulse position modulation circuit
In pulse position modulation, the amplitude and width of the pulses are kept constant, while the position of each pulse with reference to position of reference ...
Intercom Circuit – Circuit Schematic
Intercom Circuit
The intercom schematic fulfills its tasks to provide a reliable communication line and is very simple to construct. The circuit is made up of an amplifier, two ...
pic raymarine seatalk bus interface – Circuit Schematic
pic raymarine seatalk bus interface
I`m working on a project with a PIC to communicate with the Raymarine SeaTalk bus. The link below is the part of the schematic diagram of a Raymarine instrument...
RS-232 to RS-485 converter circuit usin MAX487 – Circuit Schematic
RS-232 to RS-485 converter circuit usin MAX487
RS-232 system connection faster and easier, But distance is not far. so to change to use the system RS-485 with this RS-232 to RS-485 converter projects. It.....
spi circuit – Circuit Schematic
spi circuit
SPI Integrated Circuit Bus , IC Buses, an IC, Chip-to-Chip Bus Serial Peripheral Interface, Integrated Circuit Bus types, and IC Bus Electrical Interface Descri...
Full Duplex Digital Fiber Optic Voice Link – Circuit Schematic
Full Duplex Digital Fiber Optic Voice Link
The goal of this project is to design and build a full duplex digital fiber optic voice link over a length of 50m at minimum data rate of 64 kbps. The cores of ...
Video Switch for Intercom System – Circuit Schematic
Video Switch for Intercom System
Nowadays a lot of intercom units are equipped with video cameras so that you can see as well as hear who is at the door. Unfortunately, the camera lens is.....
Video IsolatorCircuit – Circuit Schematic
Video IsolatorCircuit
These days many more audio-visual devices in the home are connected together. This is especially the case with the TV, which may be connected to a DVD pla.....
Simple Cat.5 Network Tester – Circuit Schematic
Simple Cat.5 Network Tester
This circuit came from a need for a quick and dirty  network tester that could be operated by one person. All the commercial units I tried required a person a...
Simple Cat.5 Network Tester – Circuit Schematic
Simple Cat.5 Network Tester
This circuit came from a need for a quick and dirty network tester that could be operated by one person. All the commercial units I tried required a per.....
IrDA Interface – Circuit Schematic
IrDA Interface
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, i.....
How To Connect Two Computers Using Modems – Circuit Schematic
How To Connect Two Computers Using Modems
Have you ever connected two PCs together via modems using a twisted pair cable and nothing happened? That s because the modems are expecting a phone line.....
Full-duplex Intercom – Circuit Schematic
Full-duplex Intercom
This design allows to operate two intercom stations leaving the operator free of using his/her hands in some other occupation, thus avoiding the usual push-to-t...
Electrical Isolation For I2C Bus – Circuit Schematic
Electrical Isolation For I2C Bus
When the SDA (Serial DAta) lines on both the left and right lines are 1, the circuit is quiescent and optoisolators IC1 and IC2 are not actuated. When the.....
Camera Switcher – Circuit Schematic
Camera Switcher
This circuit can be used for multiple cameras with one monitor. The circuit can be operated manually or automatically. When operated automatically the swi.....
Mini 100 Mbit Ethernet integrates microcontroller – Circuit Schematic
Mini 100 Mbit Ethernet integrates microcontroller
It`s a miniature 10/100-MbBit Ethernet module that includes an integrated microcontroller. Price is less than $60 a pop. With its minimal dimensions of 1. 38-in...
serial communication using UART in RFID project – Circuit Schematic
serial communication using UART in RFID project
Hey freinds i m doing project on RFID(Radio Frequency Identification). I m using AT89c51/52/S52 uC. I m using RS-232 fror serial communication, he.....
OV7670 configuration – Circuit Schematic
OV7670 configuration
The configuration bytes are probably all OK, but then maybe there is a problem in the communication part (writing bytes via SCCB). This is going well for the mo...
Simple Calling Bell Using an Intercom – Circuit Schematic
Simple Calling Bell Using an Intercom
A simple calling bell circuit that can be used in small offices to call the office boy using an existing intercom system. The office boy can be called from up t...