Sunday, September 14, 2014
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Soldering iron temperature controller
Soldering iron temperature controller
In most cases I need the stabilize heat for different components like transistor ,IC’s and other semiconductor devices which cannot abide the heat may be it will be damage . Then I make the simple but the important schema for control the heat of soldering iron.
Circuit diagram:
The schema consists of diac, triac, diodes, resister, potentiometer and capacitor.
Parts List:
R1 = 15 Kilo-Ohm
P1 = 250K potentiometer
C1 = 823K, 250V
D1, D2 = 1N4004 or 1N4007
D3 = Diac, bilateral trigger type
Q1 = Triac 500V/25A, BT136
Circuit Operation:
The schema works on RC time constant. The triac is connected in series with soldering iron the reason of choosing the triac is that it work on any polarity so the MT1 (main terminal one) is connected with live wire of 220VAC and MT2 (main terminal two) is connected with soldering iron heater or any of them the diac is connected in series with the gate of triac. It is use for trigger on the gate the R1 and capacitor C1 is the RC time constant and potentiometer is use for changing the trigger or pulses which control the heat of soldering iron manually. The diodes are just for enhancing the ability of charging and discharging and provide protection to diac.
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