Circuit Project Electronic www.eleccircuit.com

Circuit Project Electronic www.eleccircuit.com

RS-232 to RS-485 converter circuit usin MAX487

Posted: 20 Feb 2013 09:34 AM PST

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 is highly effective. And savings. The communication between computers together. or computer and external devices. We can be connected in many ways, such as serial ports, parallel port, LAN, or wireless. But the easiest way is to send serial data (RS-232) is preliminary connection. But has featured is that the speed of the data transfer rate up to 115200 bps. But it There are problem. The maximum transmission distance of up to 15 meters. And the connection between the source and destination devices only. Can not be connected to in the system. Therefore, we must use the RS-485 communication standard, which can have far more information. The standard RS-485 connections are detailed below. - Maximum distance of 1,200 meters. - Communication are Half-Duplex. [...]

Small AM portable radio using CIC7642E

Posted: 20 Feb 2013 06:35 AM PST

"Compact portable AM radio with plain headphones." You’ve probably seen a small radio with earphones. You can put it in your pocket. This project is similar, but the small little device. Its easy customization. And certainly cheaper. How it works We come to understand the principles of the AM radio before. The Radio can receive a radio wave signals also must there are a radio frequency transmission station. The station does not send out the a sound wave that we talked. The station will produce the kind of wave called a carrier wave. This carrier wave conductor of sound waves that we listened to the our radio receivers. The station must be mixed between the carrier and sound waves before. By this sound wave is converted as electrical signal by the microphone. And the signals are mixed together by the height of the wave. The height of the waves is [...]

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