Radio and TV Electronics.pdf

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RADIO AND TV ELECTRONICS
USING THE MULTITESTER (MULTIMETER
The multitester or multimeter is the apparatus used to measure electrical current (DCmA) or
(DCA), DCV, alternating voltage (ACV) and electrical resistance (?). The function
Of the multitester can be selected using the selector switch located below the panel.
There are two types of multitesters: the analog (pointer) and the digital (crystal display
liquid). Each has its advantage: the analog is better to test most
Components while digital is better for measuring voltages and testing resistors. Below
We see the two types cited.
COMPONENT WELDING TECHNIQUES
This course class is very important for those who work or want to work with
Electronics or even for hobbies. Good welding is the
First step to the perfect functioning of any electronic circuit. Currently the
Most commonly used soldering irons are those of 30 and those of 40 W. Below we see these two types,
As well as the internal structure of this important t
The soldering iron or welder is formed by a galvanized iron tube containing a
Nickel-chromium resistance and a metal tip inside. When passing chain
Resistance, it heats the tip until it reaches a temperature suitable for
Melt the solder. Next we will study the various items related to a good
Welding.
CLEANING THE WELDING IRON
There are many brands of soldering irons. Some very good ones like "Hikary", "Weller",
"Fame", etc. and others not so good. However, whatever the brand of the welder, we must
Take some care for it to last as long as possible:
Cleaning and tinning the tip - Hold the iron by the handle and as it goes
Heating the weld on the tip to make it shiny and tin-colored. Next
We see how it should stay:
Soldering iron 30W 40W soldering iron
The soldering iron or welder is formed by a galvanized iron tube containing a
Nickel-chromium resistance and a metal tip inside. When passing chain
Resistance, it heats the tip until it reaches a temperature suitable for
Melt the solder. Next we will study the various items related to a good
Welding.
CLEANING THE WELDING IRON
There are many brands of soldering irons. Some very good ones like "Hikary", "Weller",
"Fame", etc. and others not so good. However, whatever the brand of the welder, we must
Take some care for it to last as long as possible:
Cleaning and tinning the tip - Hold the iron by the handle and as it goes
Heating the weld on the tip to make it shiny and tin-colored. Next
We see how it should stay:
When the tip is already hot, it accumulates a crust of dirt. To clean it, enough
Pass on a steel sponge or a damp vegetable sponge, those that come in the holder
Of iron. It is also possible to buy this separate sponge. DO NOT NEVER
SANDING OR LIME THE TIP. THIS WAS QUICKLY COMPLETED WITH THE SAME.
MAINTENANCE OF WELDING IRON
1 - Resistance exchange - The most expensive irons can have the resistance changed with certain
Ease and compensates. Unscrew and remove the tip. Remove the cable screws and push the
Resistance wire inside. Remove the "spaghetti" from the resistance splint. Do not miss
These "spaghetti" since in addition to electrical insulators, they are thermal insulation. Place the
New resistance inside the metal tube. Replace the power cord and reinsert the
"Spaghetti". Position the resistor until it comes close to the tip. Replace the
Screws and the tip. Here is the procedure:

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