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This is a Soldering Station Weller 40 Watts Circuits Diagram, WLC100 model, she is one of the simplest, however very efficient, ideal for those who want to build a small soldering station. The Weller WLC100 as the main component is a triac which controls the voltage that goes to the resistor, thus making the iron to vary the temperature. He is a very robust Soldering station has a power ranging from 5-40 watts uses the tips (SPG40) and resistance (HE40), ideal for hobbyists, students, and hobbyists .  Soldering Station Weller 40 Watts Circuits Diagram List of components  R1 = 15 Ohms, 1/8 Watt 5%  P1 = 250K pot C1 = 823K, 250V D1, D2 = 1N4004 D3 = Diac, bilateral trigger type Triac Q1 = 400V/25A, Q4012LPH * (Teccor) or BTA08600c (Philips), or equivalent ATTENTION : The Triac has an isolated tab, so if you need to replace sure to use the same type.

Quite often, we forget to turn off the soldering iron. This results in not only a smoking oxidised iron but also waste of electricity. To solve this problem, here’s a circuit that automatically switches off the soldering iron after a predetermined time. The circuit draws no power when it is inactive. The circuit can also be used for controlling the electric iron, kitchen timer or other appliances. Automatic Soldering Iron Switch Circuit Diagram At the heart of the circuit is a monostable multivibrator built around timer IC 555. When the circuit is in sleep mode, to switch on the soldering iron, you should push switch S1 momentarily. The multivibrator gets triggered and its output pin 3 goes high for around 18 minutes to keep relay RL1 energised via transistor T1. At the same time, capacitor C3 charges and AC supply is provided to switch on the soldering iron via normally opened (N/O) contacts of relay RL1. The soldering iron remains ‘on’ for the time period predetermined by resistor R1...