Soldering Iron Temperature Controller

Being a electronics geek we have to know detail about soldering temperature. Here is the circuit of simple soldering iron temperature control, in order to control or limit soldering temperature.

Circuit Description of soldering iron temperature controller

The circuit of soldering temperature controller is designed and fabricated using DIAC and TRIAC with its corresponding passive components. The varying of temperature from zero to maximum is done by TRIAC where DIAC is used to control the TRIAC firing in both directions. The potentiometer used here is for setting the temperature of the soldering iron.


Resistors (all ¼-watt, ± 5% Carbon)

R1 = 2.2 KΩ

VR1 = 100 KΩ


C1 = 0.1 µF/400V


TRIAC1 = BT136

14 thoughts on “Soldering Iron Temperature Controller”

    1. We can use any type of Iron with this device ; The normal Flat Cloth iron used to control the temperature of the iron , But Do you really want to do this? Because most of the modern Cloth Iron already have a Temperature controller in it.

    1. Thanks for your reply.
      And no it’s not a Fan controlling circuits.
      What this circuit does is limit the ammount of volate and current passed to the Soldering iron to control it’s temperature. And it is a manual circuit.

      We will alsom post automatic soldering iron temperature control circuit in the near future , Till then sty tuned through our facebook page and email suscription.

  1. Judging by many soldering irons, I have used over the years. The best controller would be the one that emulates the conditions that exist during the heating up period. This can be determined, empirically, when the residue or oxidation left from the previous session on the soldering tip is cleaned-up easily. This represents the ideal temperature for a particular iron because the tip is kept clean, shiny and solder melts easily onto the tip. However, this condition does not last long and as the temperature on the tip rises, oxidation begins to form. When the iron reaches its final temperature, constant cleaning of the tip is required, and in almost all instances the tip gets oxidized as fast as the it leaves the cleaning sponge.

  2. how to display the temperature, how extent circuit to be modified, what is automatic temperature control soldering iron

  3. Are all the components used in this circuit available in Indian market.I don’t know about Diac and Triac that’s why I am asking

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