AIU - 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.
AIU - Analog Interface Unit - schematic

Here are some of the features : 8-bit ADC and DAC Powered from the parallel port 1Mohm input impeadance. Software selectable +/-1.25V or +/-2.5V input and output ranges.

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