Simple PC Data Acquisition by AD7569

If you need to add simple data acquisition capabilities to your PC, then look no further than the Analog Interface Unit. The Analog Interface Unit (AIU) is a simple circuit that connects to a PC parallel port, and allows you to sample and output 8-bit analog signals under software control. Here are some of the features : * 8-bit ADC and DAC * Powered from the parallel port * 1Mohm input impedance. * Software selectable +/-1.25V or +/-2.5V input and output ranges

Read more source:http://www.alternatezone.com/electronics/aiu.htm
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Voice Record / Playback Circuit
The ISD1000A is a Direct Analog Storage device which allows you to store 20 seconds worth of voice data on an IC chip which can be play backed anytime. The data stored will stay in memory even if the power is removed. To use the circuit below simple apply power to the circuit, press the record b ...
USB to Serial Adapter RS-232
USB to Serial Adapter RS-232 Serial Port to USB The USB to Serial adapter (converter) lets you use a serial PDA, GPS, cell, etc. with a standard USB port. This adapter is the easiest way to add a serial port to your computer. Many PDAs, digital cameras, GPS units, barcode scanners, and other ...
Digital Voice Record and Playback Project by ISD2560P
This project is based on ISD2560P IC which allows us to record 60 seconds voice and playback it with very high quality. As shown in the schematic, we input the voice by using an electret microphone. If a dynamic microphone is used, R2,R3,R4 resistors and C3,C5,C7 capacitors will be omitted ...
USB to Serial Interface by MAX213
USB to serial interface is based on the powerful FT232 chip from FTDI. It enables very easy connection of the user's application to the PC via the USB port, without necessity of any deep knowledge about the complicated USB problems. FT232 chip is capable to transfer data at speeds up to 1M Baud ...
USB Data acquisition by PIC18F4550
This project is simple and small component count USB data acquisition or USB DAQ. The main core of USB device is PIC18F4550 .The firmware for PIC modified from Microchip CDC library. When connect this USB Data acquisition with PC then windows ask for driver after driver installed(only first time ...