We chose the high-performance 7 / 2-bit A / D conversion device MC14433 produced by Motorola, which contains an on-chip oscillator. As long as two capacitors and two resistors are connected externally, the output range selected here is 199.9 mV. Among the output signals of MC14433, Q0 ～ Q3 are BCD code data output terminals, and DS1 ～ DS4 are the output strobe signals of thousands, hundreds, tens, and single digits, respectively. By adjusting the resistance of resistor R, the output BCD code of MC14433 is the same as the input voltage. The MC1403 is a precision power supply that provides a reliable reference voltage for the MC14433. 
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