Beginner radio amateur. Radio. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Beginner radio amateur. Radio. 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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Here is the schematic for your first receiver:

Beginner radio amateur. Radio. Scheme

There is nothing new for you here, I can only explain about the coils. If you see on the diagram two coils with a line between them, then this means that these coils have inductive coupling. If we place two inductors side by side and start changing the current in one of them, then an EMF will appear in the second coil. An inductive coupling between coils L1 and L2 is needed to connect the circuit with the rest of the receiver. Communication is inductive, conductive и capacitive.

Induct. Conduct. Capacity

Beginner radio amateur. Radio

Analysis

The signal of the radio station, selected by the oscillatory circuit, from the coil L2 through the capacitor C1 enters the base of the transistor, and everything is like in the amplifier from lesson 3, the only difference is that the transistor is loaded not on the headphones, but on the resistor R2. From the resistor R2, the signal goes to the detector with a voltage doubling. It works like this: in the first half-cycle of the signal, the capacitor C2 is charged through the VD1 diode, and in the second half-cycle it is discharged through the VD2 diode.

Okay, you got another dose of theory, now the design. The coil, as I said, must be wound on a ferrite rod about 10 cm long, it must contain 70-80 turns of insulated copper wire with a diameter of 0.2 mm, this is a PEV 0,2 wire. (for those who are especially smart, I explain that I call a wire a wire. :)) Capacitor C1 is any variable capacitor with a maximum capacitance of at least 100 pF. Resistors: R1 - 100 kOhm, R2 - 3,3 kOhm. Capacitors are permanent all 0,01 microfarads. Any low-power high-frequency transistor, for example, KT315 with any letter index, you can use a pnp transistor, just change the polarity of the battery and diodes. Diodes - D9V. Headphones high-impedance for example TON-2 or "Gamma".

Publication: cxem.net

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