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Farm and sideline products autoregulation drying box circuit

2014-11-06 03:40  
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Farm and sideline products autoregulation drying box circuit
Circuit working principle: This farm and sideline products autoregulation drying box circuit consists of power source circuit, temperature control circuit and humidity control circuit, is shown in the diagram. Power source circuit consists of buck capacitor Cl, discharge resistors Rl, rectifier diodes VDl, VD2, filter capacitor C2, current limiting resistors R2, R3, zener diode VS, and power indicator LED VLl. Temperature control circuit consitsts of thermistance RT ( temperature sensor) , time base intergrated circuit IC1, transistors V1, V2, resistors R4, R6-R8, R12, potentiometers RP1, RP3, capacitors C3, C5, LED VL2, thyristor VT1. At the same time, C3discharges byRP1, R8 and pin 7 of IC1 circuit , when C3 justified voltage decreases to about 3.3V, IC1 pin 3 will output high level to make V1, V2 and VT1 breakover, EH starts heating. RI and R2 select 1/2W metal film resistors ; R3-R13 use 1/4W metal film resistor or carbon film resistors.RT uses MZ2A positive temperature coefficient thermistor .RS uses ZHC-l or MSO-1 humidity sensitive resistor device .