Convenient soldering iron. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Convenient soldering iron. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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Any DIYer has a soldering iron. But for those who have to deal with modern electrical and radio equipment, this tool is in a special account. And the requirements for it are quite stringent: with small dimensions, low-voltage supply voltage and low power consumption, ensure excellent soldering quality. Moreover, with a maximum of amenities, including a tip temperature controller and a special stand with a tray for solder flux and a place for tinning.

I am quite satisfied with the domestic electric soldering iron EPSN-40/40 with a home-made multifunctional stand. I was convinced that all this works no worse than the advertised foreign analogues, although the costs are minimal. And the materials for such a soldering complex are the most affordable.

Racks, a tray, elements of a temperature controller are fixed on a textolite base. In order not to use a 220/40 V transformer that weights the structure (weight not less than 1,5 kg, power taking into account the efficiency of -50 VA), a capacitor lowering of the supply voltage is used. Moreover, the values of C1 and C2 are chosen so that the "extra" 175 V is "eaten up" on capacitances, and up to 45 V is supplied to the load. To ensure power supply regulation, the shunt chain R3VD1R4 is connected in parallel to the soldering iron.

By reducing the resistance of the variable resistor R3 by simply turning the "Temperature" knob, the voltage of the positive half-cycle is partially reduced. The value of R4 is chosen so that at the minimum value of R35 the load receives no more than 45 V, and at the maximum - XNUMX V.

Soldering iron with multifunctional stand (click to enlarge): 1 - electric soldering iron EPSN-40/40: 2,15 - stands (steel sheet s1.2); 3 - bolt M3x6 (2 pcs.); 4 - washer (2 pcs.); 5 - nut M3 (2 pcs.); 6 - tin casing; 7- temperature adjustment knob; 8 - plug (250 V, 6 A); 9 - leg (rubber sheet s6, 4 pcs.); 10 - resistor MLT-0,5 (220 kOhm, 2 pcs.); 11 - MBGO capacitor (160 V. 30 uF. 2 pcs.); 12 - bracket (steel sheet s0,8); 13 - bath (duralumin sheet s0,5); 14 - base (textolite sheet s6); 16 - variable resistor PPB-15G (470 Ohm); 17 - rubber bushing (2 pcs.); 18 - bolt M4x48; 19 - washer (2 pcs.); 20 - nut M4; 21 - bracket (steel sheet 50,8); 22 - PEV-10 resistor (20 Ohm); 23 - semiconductor diode KD202K; 24- screw M3x6 (10 pcs.)

Handy soldering iron
Schematic diagram of the soldering iron tip temperature controller

Resistors R1, R2 serve to discharge the capacitors after turning off. Together with the rest of the radio elements of the circuit, they are enclosed in a tin protective casing. Capacitor cases are insulated from each other and from the metal mounting bracket with several layers of cable paper.

The temperature control knob is a typical plastic one (for example, from old radio equipment), and pharmaceutical corks (from penicillin vials) can be adapted as rubber legs by attaching them at the installation site with glue "88", "Moment", etc. The wire of the base soldering iron is soldered directly to the connection nodes of capacitors with resistors.

Author: B.Povalyaev

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