An Analog-to-Digital Converter

Abstract

The author has made an analog?to?digital converter, using a 4 arc 25 step rotary selector switch, relays and an electronic amplifier.Input voltages are compared with feed-back voltages, which are produced from contacts of relay switching circuits, a set of resistances and stand ard D.C.voltage.Results of comparisons sequentially control relay logical circuits, including rotary selector switch and output relays.Output informations are sent to printer or tape puncher and indicated by numerically indicating tubes.
In the case of 2-3 decimal digits conversions, sampling rate is about 1-3 per second and automatic multi-range of input is possible.