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Ⅳ times after this comparison, Ⅳ-bit status register data shall be converted, removed from the data bus. This article uses the ADC is AD574, the major technical indicators precision 12, conversion time 25, the logic TTL, l2-bit data. Power cc is +12 V, + l5V, 2 to lOV, 22V, c is a negative power supply 12V, a 15V, 28 DIP pins. 2 Temperature ADC in closed loop control system composed by the ADC loop microprocessor temperature control system for heating section with 4 parts baking oven. Blast from the wind tunnel temperature regulation to achieve. Control scheme for a given value of the loop 2 back control of Dead Pina shown in Figure 2 using the value of dead given back control \this range, by controlling the electric valve control air duct, in order to achieve the purpose of regulating the temperature. 4 Section leopard heating circuit are identical, their management of a small closed-loop temperature control system. a small closed-loop control system block diagram shown in Figure 3. Figure 3-loop control system, a small downtown Tin Box 2.1 input circuit input circuit and amplified by the temperature measuring bridge circuit. thermometry bridge output voltage is very small, we must filter out the noise and amplification, amplifier circuit, such as Figure 4. amplifier circuit integrated with the 7032M, the diode D, D. from the input protection. R. used to adjust the magnification. gain after the signal from the c-ended output, sent to the analog transmission gate of the analog signal input . 2.2ADC and computer interface circuit through the parallel ADC and computer PIO programmable interface circuit connected to the interface circuit shown in Figure 5. amplifier circuit output analog signals from analog transmission circuits around turn 4, 5 min major interface circuit 128 Xi'an College road transport in 1993, the door (AD7506) of the INO-ended input, allowing the terminal (EN) is high work. To eliminate the interference pulse j towel, INO input at the input and then a 0.68 capacitor. computer peripheral analog input is 0 ~ 5V, while the AD574 analog input signal requirements of 0 ~ 10V, this, to increase the magnification level of 2 l of the amplifier, where the use of MC1741 op amp. in large signal, the exploration work of the negative feedback op-amp for A / D conversion accuracy is not affected by AD574 PIO parallel interface connected to the bus, bidirectional bus driver is done through the 74LS244. PIO of the PAO and PBO connected to the output driver circuit, the control valve is electric reversal. AD574 12-bit data output termination to the PIO of the PA1 ~ PA7 and PB1 ~ PB5, select the data control terminal R / C connected to PB6; \data processing, display, print, export control information through the PIO output driver circuit, the electric motor control relay valve control air flow duct to achieve temperature control. 2.3 output circuit output driver circuit shown in Figure 6, it by the, t,, Da composition control is transferred to output circuit {, T., J, D.. composed of inversion of control output circuit; when the PIO output high voltage, the tube. (), saturation, relays connected to the electric valve gate. 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