Soldering station

Good afternoon, dear readers! Today we will talk about assembling a soldering station. So, let's go! And it all started with the fact that I came across this transformer: It's 26 Volts, 50 Watt. As soon as I saw it, a brilliant idea immediately came to my mind: to assemble a soldering station based on this transformer. On Ali, I found thissoldering iron. According to the parameters, it is ideally suited - the operating voltage is 24 volts, and the current consumption is 2 amperes. I ordered it, a month later it came in shock-resistant packaging. In the picture, the sting has burned a little, for it has already connected the soldering iron to the transformer. I got the connector on the market, immediately with a connector for four wires.
Soldering station
But to connect the soldering iron directly to the transformer is too easy, uninteresting, and the stinger will deteriorate so quickly. So I immediately began to think about the temperature control unit of the soldering iron. At first, I thought of the algorithm: the chip will compare the value with the variable resistor with the value on the thermistor, and, based on this, either all the time to apply current (heating the soldering iron)either serve it "in batches" (temperature retention), or not at all (when the soldering iron is not used). For these purposes, the lm358 microcircuit is perfect - two operational amplifiers in one package.

Soldering station controller circuit

Well, let's go directly to the scheme itself:
Soldering Station
Parts List:
  • DD1 - lm358;
  • DD2 - TL431 ;
  • VS1 - BT131-600;
  • VS2 - BT136-600E;
  • VD1 - 1N4007;
  • R1, R2, R9, R10, R13 - 100 Ohms;
  • R3, R6, R8 - 10 kΩ;
  • R4 - 5.1 kΩ;
  • R5 - 500 kΩ (trim, multi-turn);
  • R7 - 510 Ohms;
  • R11 - 4.7 kOhm;
  • R12 - 51 kOhm;
  • R14 - 240 kOhm;
  • R15 - 33 kΩ;
  • R16 - 2 kΩ (trim);
  • R17 - 1 kΩ;
  • R18 - 100 kΩ (variable);
  • C1, C2 - 1000uF 25v;
  • C3 - 47uF 50v;
  • C4 - 0, 22uF;
  • HL1 - green LED;
  • F1, SA1 - 1A 250v.

Solder making stations

on in The circuit is equipped with a half-wave rectifier (VD1) and a quenching current resistor.
Soldering station
Next, a voltage stabilization unit is assembled on DD2, R2, R3, R4, C2. This unit lowers the voltage from 26 to 12 volts needed to power the chip.
Soldering station
Then the control unit itself runs on the DD1 chip.
Soldering station
And the closing unit is the power unit.From the chip output through the indicator LED, the signal goes to the VS1 triac, which controls the more powerful VS2.
Soldering station
We also need a few wires with connectors. This is not necessary (wires can be directly soldered), but for Feng Shui just right.
Soldering station
For a printed circuit board, we will need textolite with dimensions of 6x3 cm.
Soldering station
Transferring the drawing to the board using the laser-iron method. To do this, print this file here, cut it out. If something is not transferred, finish painting with varnish.
Soldering station
Then throw the board into a solution of hydrogen peroxide and citric acid (3: 1 ratio) + a pinch of salt (it is a chemical reaction catalyst).
Soldering station
When the excess copper is dissolved, we get a fee, wash it with running water
Soldering station
Then we remove toner and varnish with acetone,drill holes
Soldering station
And that's it! The printed circuit board is ready! It remains to tin the tracks and correctly solder the components. Solder, focusing on this picture:
Soldering station
The following places must be connected with jumpers:
Soldering station
So, we collected a fee. Now we need to put all this in the case. The base is a square of plywood with a size of 12.6x12.6 cm.
Soldering station
The transformer will be in the middle, fixed with screws on small wooden bars, the board will "live" side by side, bolted to the base through a corner with a bolt.
Soldering station
Soldering station
And the dome will serve as a regular tray, bought in the household. goods.
Soldering station
On the front panel we make several holes: for the switch, variable resistor, LED and connector for a soldering iron.There is a hole for the network plug on the back panel. And this is what happened:
Soldering Station
Soldering Station
Soldering station
The circuit started at the first power up and does not need to be adjusted. This circuit can be powered from 12V, which makes it universal. For this we need to exclude from the general scheme DD2, R2, R3, R4 and C2. Also, the thermistor in the circuit should be replaced with a constant resistor of 100 Ohms. This is where my article comes to an end. Good luck in repetition! P.S. If the soldering iron does not start, check each connection on the board!

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