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RS-232 Data Switch – Circuit Schematic
RS-232 Data Switch
This report deals with the design for a small asynchronous serial data switch. The switch architecture allows 14 serial ports supporting a subset of the RS-232 ...
autodetects baud rate circuit MAX202 and PIC16C54 – Circuit Schematic
autodetects baud rate circuit MAX202 and PIC16C54
The popularity and easy access of RS-232 ports lend them to many communication projects. You can use a port as is” or as a tiny parallel port when the exchang...
RS232 to RS485 Converter – Circuit Schematic
RS232 to RS485 Converter
The project we have chosen as our example is an RS232 to RS485 converter. This is a often needed device which can demonstrate a lot of principles of circuit des...
DS Protocol (Data transfer via handshake) – Circuit Schematic
DS Protocol (Data transfer via handshake)
The DS protocol was designed to provide firmware-based bidirectional host-to-slave inter processor communications for situations in which no hardware solution i...
Wireless Coupler Terminal Interface – Circuit Schematic
Wireless Coupler Terminal Interface
The purpose of the terminal interface is to allow my computer to communicate with Minimum Mass Wireless Coupler equipped devices using a terminal emulator progr...
Data Transfer interface – Circuit Schematic
Data Transfer interface
The DS protocol was designed to provide firmware-based bidirectional host-to-slave inter processor communications for situations in which no hardware solution i...
Composite Video titling Generator – Circuit Schematic
Composite Video titling Generator
The VTG-01 is designed to display user defined text over a composite video signal. This is useful in a multitude of different applications such as adding titles...
Serial port Infrared Receiver – Circuit Schematic
Serial port Infrared Receiver
This is a general purpose serial port infrared receiver. With the help of appropriate software (see below) you can control different functions of your pc from a...
IR Link PIC tranceiver – Circuit Schematic
IR Link PIC tranceiver
I just finished a half duplex serial asynchronous link from a simple PIC circuit to the RCX. It is able to receive codes from the RCX (or Lego RCX remote contro...
IR Link PIC tranceiver – Circuit Schematic
IR Link PIC tranceiver
I just finished a half duplex serial asynchronous link from a simple PIC circuit to the RCX. It is able to receive codes from the RCX (or Lego RCX remote contro...
Infrared Detection with 74HC04 – Circuit Schematic
Infrared Detection with 74HC04
The two basic parts for working with IR are the emitter and the detector. The emitter is typically an LED that emits near-infrared light. A typical wavelength i...
Infrared Detection with 74HC04 – Circuit Schematic
Infrared Detection with 74HC04
The two basic parts for working with IR are the emitter and the detector. The emitter is typically an LED that emits near-infrared light. A typical wavelength i...
RS-232 to TTL cable with MAX232 – Circuit Schematic
RS-232 to TTL cable with MAX232
Here is a diagram of the internals of the MAX232A. It shows a double charge pump voltage doubler and a +10v to -10v voltage inverter. The voltages output are us...
RS-232 to TTL cable with MAX232 – Circuit Schematic
RS-232 to TTL cable with MAX232
Here is a diagram of the internals of the MAX232A. It shows a double charge pump voltage doubler and a +10v to -10v voltage inverter. The voltages output are us...
IR headphone receiver CD4046 – Circuit Schematic
IR headphone receiver CD4046
IR detector diode D1 intercepts the IR signal at around 40 kHz and feeds it from U1, a high-gain preamp, to PLL, U2, a 4046 configured to serve as an FM detec...
IR headphone transmitter CD4046 – Circuit Schematic
IR headphone transmitter CD4046
The transmitter for the wireless headphones is built around a CD4046 CMOS phase-locked loop, coupled with a driver transistor, and a pair of infrared LEDs. ...
VGA to PAL and NTSC converter – Circuit Schematic
VGA to PAL and NTSC converter
The circuit needs that the VGA card sends out the video signal the the RGB format compatible with PAL or NTSC standard video timings. This is accomplished with ...
Sound Card Interface with Tone Keyer – Circuit Schematic
Sound Card Interface with Tone Keyer
This is an improved version of the audio interface commonly used to connect a computer soundcard to a transceiver`s receive and transmit audio circuits. This ki...
Morse Code Beacon Keyer – Circuit Schematic
Morse Code Beacon Keyer
This circuit stores a single morse code message as bits in an EPROM chip, the message is sent to a relay which can key a CW transmitter. The keyer can output ei...
IR Link II – Circuit Schematic
IR Link II
A basic Imfra Red Link for audio communication for distances upto 3 metres. Transistors can be replaced with 2N3904 and 2N2222. In his circuit Milan has created...