I discovered a great improvement to my decimal successive approximation type digital voltmeter!
See the old version here: https://everycircuit.com/circuit/5334865438048256
If I redesigned the Successive Approximation Register so that it worked in BCD instead in binary, I could skip the whole binary to decimal process and connect the register output directly to the 7-segment decoders. Swell!
If you'd like more info on how a successive approximation type voltmeter works, please check out my first circuit like this. https://everycircuit.com/circuit/6044286526947328
Just a brief description, this circuit is basically a glorified counter analog to digital converter (ADC). It uses a successive approximation register (SAR) to successively guess closer to the actual input voltage, much like a binary search algorithm.
Specifications:
Clock: 2khz
Sample rate: 20ms or 50 samples per second.
Accuracy: 100mV
Error: ~100mV
Range 0V to 9.9V
OUTPUT NUMBER ~ BCD number stored in SAR
If 7.3V is input, then SAR will find ~0111 0011= 73
Blue waveform: Approximation voltage
Green waveform: Unknown voltage input
Orange waveform: Clock
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https://everycircuit.com/circuit/5229632454131712
