Temperature control circuit

Published:2011/5/9 20:08:00 Author:TaoXi | Keyword: Temperature, control | From:SeekIC

Related componts PDF download: BC251ABC107BBC141 In figure (a), heating resistor RL connects to the 220V AC grid by the SCR. Figure (b) shows the control circuit. In order to measure the temperature, we use the bridge circuit which is composed of the resistance RT (measuring head), R (the given value resistor) and two 1.5kΩ resistors. When the value of probe resistance is the same as the resistance R, the bridge is in balance. The probe current is about 10mA. The resistance number of the transformer: n1 and n2: 100 turns, n3 and n4: 80 turns, they are all surrounded by the 0.2mm copper-paint wire.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Remote_Control_Circuit/Temperature_control_circuit.html

Print this Page | Comments | Reading(3)