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.

This ZIP file includes the following : * Schematic and PCB files in Protel (DOS) format * Source code driver routines in C, BASIC, and PASCAL * Some simple test programs. * Documentation

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 Simple PC Data Acquisition Circuit - Link

Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... [more]