Beginner radio amateur. First design. Scheme, description

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Beginner radio amateur. First design. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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Your first design will be called - "Low Frequency Amplifier"!

What is needed for it:

Transistor MP 41 B - VT1.
Electrolytic capacitor 10uF * 16V - C1.
Capacitor ceramic 0,01 uF - C2.
Resistor 150 kOhm - R1.
Headphones TON-2 or others high resistance - BA1.
Battery 4,5 V - GB1.
Any miniature switch - SA1.

Resistors	These are radio components that resist email. current. Unit of measurement - Ohm, kOhm, mOhm. In the diagram, they are denoted by the letter "R", the symbol is .
Capacitors	These are radio components that are capable of accumulating an electric charge in themselves. Unit of measurement - F, μF, nF, pF. In the diagram, they are denoted by the letter "C", the symbol is
Transistor	A semiconductor element, there are two structures - npn and pnp, they differ in that they have different polarities, they will be described in more detail in lesson 3. In the diagram it is denoted by the letters "VT", the symbol is for pnp and for npn.

Don't be afraid of these wild names! :-) Now I'll explain everything.

Note

An electrolytic capacitor differs from a conventional (ceramic) one in that it has polarity.

Beginner radio amateur. First design

The rest, I think is clear.

Diagram:

Beginner radio amateur. First design, scheme

Look carefully at the diagram! I hope you understand how everything is indicated there. To properly solder this amplifier, you need:

Cut out a suitable piece of cardboard.
Draw this diagram on it.
Make holes in the cardboard under the paws of the radio components.
Tin the paws of the radio components (see lesson 1).
Insert the radio components into the holes on the cardboard.
Bend the paws of the radio components on the other side of the cardboard and combine them with each other according to the scheme.
Solder the paws together.

Forgot the most important thing!!!

The transistor does not care how to put! :-) It has three outputs - 1-Base, 2-Emitter, 3-Collector. In the diagram, the base comes out of the middle, the emitter is marked with an arrow, and the collector is the one that remains. You will ask - "But how can they be distinguished from each other, because they are not marked on the transistor in any way!". I answer like this: This is only for MP 35 - MP 42! Different transistors have different cases and, therefore, you can find markings, markings in reference books.

Now turn on the amplifier and put on the headphones, you should hear a uniform noise. If it’s deaf as in a coffin, then check whether the transistor, battery, electrolytic capacitor are correctly installed (it says where the plus is), whether the conclusions are well soldered and if there is a short circuit somewhere. If it seems to you that everything is correct, but it still does not work, then close the input of the amplifier, you should hear clicks.

Publication: cxem.net

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