This circuit converts pair of binary 4-bit register values to analog voltage, sums the voltages and converts the result back to the binary representation for display.
Overflow of summation is detected by an operational amplifier. Overflow is displayed by blinking the dot on the 3rd display. Unlike binary adder, analog result will not wrap-around in case of the overflow.
Second register auto-increments for demonstration purposes.
NOTE: Such analog summator would be impractical in the real-life due to noise, high-cost and latency of DAC/ADC, however it can be interesting as a concept.
