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10 Mhz fiberoptic receiver – Circuit Schematic
10 Mhz fiberoptic receiver
The receiver will accurately condition a wide range of light inputs at up to 10 MHz data rates. The optical signal is detected by the PIN photodiode and amplifi...
Electrical isolation for the I2C bus with optocouplers – Circuit Schematic
Electrical isolation for the I2C bus with optocouplers
When the lines SDA (Serial DAta) and SDA 'are logical '1', the circuit is at rest with the result that optocouplers IC 1 and IC2 can not convey absolutely no in...
FSK Demodulator/Tone Decoder with RC2211N
A monolithic phase locked loop for data communications. The IC contains a basic phase locked loop for tracking an input signal within the pass band, a quadratur...
RS-232 Protocol Analyser Y Cable – Circuit Schematic
RS-232 Protocol Analyser Y Cable
In need for a cheap but effective RS-232 Protocol Analyser? Just make your own Y adaptor to enable the logging or display of data transmitted and/or received in...
MIDI Clock – Circuit Schematic
MIDI Clock
This circuit generates MIDI clocks and start/stop messages....
MIDI to Sync24 Convertor – Circuit Schematic
MIDI to Sync24 Convertor
This self-powered circuit converts MIDI clocks to DIN sync24. This type of clock is used on old Roland gear and provides a 24 pulses per quarter note clock and ...
Overvoltage protection for RS232 – Circuit Schematic
Overvoltage protection for RS232
RS-232C serial port lines are quite prone to be damaged by overvoltages. The damaged to computer serial ports have become more and more expensive to replace bec...
RS-232 data buffer – Circuit Schematic
RS-232 data buffer
This is a simple serial port buffer circuit I designed for a friend to speed up his SLIP connection in campus computer network "TRINET" of Helsinki University o...
Infrared transmitter – Circuit Schematic
Infrared transmitter
This is an IR transmitting circuit which can be used in many projects (I designed this to try to make my 3D glasses wireless). This IR transmitter sends 40 kHz ...
Laser Data Link schematic – Circuit Schematic
Laser Data Link schematic
This document tells about one of my experiments with semiconductor laser modules. I bought one semiconductor laser for all kinds of experiments. This TIM202 mod...
Infrared Audio TX/RX – Circuit Schematic
Infrared Audio TX/RX
Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place o...
Simple Intercom circuit – Circuit Schematic
Simple Intercom circuit
The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 ...
RS-232 Laser Transciever circuit – Circuit Schematic
RS-232 Laser Transciever circuit
Laser based projects used to be expensive, until the development of solid state lasers. This project is designed for the entry level laser experimenter. The cir...
Simple Infrared TX / RX circuit – Circuit Schematic
Simple Infrared TX / RX circuit
The transmitting section of this infrared tx-rx is unusually simple but it works rather well: the infrared LED pulses at a frequency of 160Hz and its range, wit...
RS232 cable modem – Circuit Schematic
RS232 cable modem
First of all you have to build one cable adapter to connect the female 9pins connector of the modem, with female 9pins connector of the base of E-10G HPC. To bu...
Easy intercom 2 wire circuit – Circuit Schematic
Easy intercom 2 wire circuit
This Intercom is powered by two 9volt batteries and uses only current when the Intercom is used. Both units are connected via a two-wire little cable or simp...
Isolated RS-485 and RS-422 – Circuit Schematic
Isolated RS-485 and RS-422
Many RS-485 and RS-422 networks require isolation for safety, noise reduction, or ground loop elimination. A conventional circuit is shown in Figure 1. Unfortun...
Video Camera switcher MAX454 – Circuit Schematic
Video Camera switcher MAX454
The video switcher described here can display the output of two, three, or four cameras on a single monitor. The number of cameras is set by a DIP switch on the...
video on telephone line wires – Circuit Schematic
video on telephone line wires
The Videowire converts a baseband video signal into a low impedance differential signal that can be sent over ordinary four conductor telephone wire. A send ...
Packet Radio with AVR – Circuit Schematic
Packet Radio with AVR
Here is some experimental hardware and software to transmit and receive AX.25 packets. It is essentially a PIC-E clone designed around a Atmel AT90S2313 with ...