VHF receiver on the K174XA42 chip. Scheme, description

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VHF receiver on the K174XA42 chip. 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 main parameters are as follows:

Rated supply voltage, V - 4,5
Current consumption, mA, no more - 8
Input RF signal frequency, MHz - 1,5...150
Sensitivity, μV - 6
Output voltage ZCH, mV - 100
The coefficient of non-linear distortion,%, not more than - 0,5
Signal-to-noise ratio, dB, not less than - 50

The diagram is here:

(click to enlarge)

The microcircuit, by the way, is equipped with a silent tuning system. In general, I will not dwell on the merits of this scheme for a long time. The fact remains - you collect it and get a VHF receiver in working condition, without the need for any adjustment. Hurrah, comrades.

And now there will be a traditional plate with components.

Designation in the diagram	Nominal
C1	3900
C2	180
C3	330
C4	330
C5	0,1
C6	330
C7	220
C9	180
C8	3300
C10	27 47 ...
C13	0,01
C11	0,01
C12	0,15
C14	1800

L1	0,56uH

R1	22kOhm
Chip	K174HA42B

Publication: radiokot.ru

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