Attachment for a soldering iron. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Even novice radio amateurs know that it is more difficult to work with an overheated soldering iron, and the quality of the solder joint will turn out to be low. To reduce the temperature of the soldering iron, you need to lower the voltage of its supply. This can be achieved in a number of ways; I chose what seems to be the simplest of them.
Fig. 1
A plastic box caught my eye, similar to a school pencil case, in which, as they say, from improvised materials, a simple device was assembled in just two hours according to the diagram in fig. 1. This attachment is designed to work with a 40W soldering iron.
When the SA1 contacts are closed, the voltage at the load is approximately 150 V (measured with a pointer avometer). If you also close the SA2 contacts, the load voltage will increase to 200 V. When the SA3 contacts are closed, it will become equal to the mains 220 V, regardless of the position of SA1 and SA2.
Fig. 2
Capacitors should be paper (K40U-5, KBG-MP, KBG-MN, BGT, etc.) for a rated voltage of at least 400 V or film K73 for a voltage of at least 630 V. You can use a battery of several capacitors connected in parallel. Resistors R1, R2 discharge the capacitors after the set-top box is disconnected from the network.
Neon lamp HL1 serves as an indicator of the presence of voltage on the load. Three toggle switches SA1-SA3 - TP1-2 or TV2-1, TV2-1 -2, T 1, T2, MT1.
The appearance of the console is shown in the photo of fig. 2. It has been working properly for over 20 years.
Author: A. Sundeev
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