Loud-speaking detector receiver. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Loud-speaking detector receiver. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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The oscillatory circuit of the receiver is formed by the capacitance of the antenna (beam 12 m) and the inductance of the coil L1 (150-200 turns), tuned by a rod from a ferrite antenna. The constant component of the signal detected by the diode VD1, smoothed by the inductor Dr1 and a large storage capacitor C4, serves to power the amplifier. The current and supply voltage are controlled by pointer instruments - a recording indicator head from a tape recorder with a total deflection current of 0,3 mA and a conventional 25 V voltmeter made from a 50 μA head with an additional resistance of 500 kOhm.

Loudspeaker detector receiver

The variable component of the detected AF signal is fed to the input of the amplifier through the level control R1 and the isolation capacitor C2. The fourth MC element is not used to reduce the current consumption. The inductor Dr1 was the primary winding of the same transformer from the broadcast loudspeaker as Tp1. Good results are also obtained with small-sized network transformers ("power transformers") from old 220/9 or 220/12 V power supplies.

When tuned to the radio station "Mayak" 549 kHz, the receiver worked even a little louder than the previous analog one, the devices showed 6 V at a current of slightly more than 100 μA, but the sound clearly wore a "digital" tint. In addition, noise began to be heard in pauses (it was not there at all in the analog amplifier), but this can only be noticed in complete silence.

In general, the design turned out to be quite efficient, and it can be recommended for experiments and further improvement.

Author: V.Polyakov

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Comments on the article:

Sanya
Something seems to me that if as much as 6 volts is formed on the detector, then no amplifier on the microcircuit is needed. Connect the transformer directly to the detector and - voila! So there are less losses on any chokes, conders and microcircuits.

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