Soldering attachment. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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When working with a soldering iron, it often becomes necessary to select the optimal heating temperature for its tip. This can be done using a prefix (see figure), which allows you to get four different voltages on the load.
In the position shown in the diagram, the soldering iron is powered by half-wave voltage, so the heating temperature of the tip is minimal.
When switch S1 is in the closed position, the temperature of the tip rises because the soldering iron is now powered by full-wave voltage.
If, on the contrary, the contacts of switch S1 are open and S2 are closed, the temperature of the tip is even higher - after all, the soldering iron is now powered by a pulsating voltage from a half-wave rectifier with a filter capacitor.
To further increase the temperature, it is necessary to close the contacts of both switches - you get a full-wave rectifier with a filter capacitor.
These parts are for a 40W soldering iron. In the case of using a soldering iron of a different power, it is necessary to change the capacitance of the capacitor accordingly and select diodes with a different value of the rectified current.
Author: A. Tychinin, Kuznetsk, Penza region; Publication: N. Bolshakov, rf.atnn.ru
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