Encyclopedia of radio electronics and electrical engineering / radio reception

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In the published article, a description of the AM-FM radio receiver is offered to the attention of readers. Its RF path is made on a TA8184p chip from Toshiba. This microcircuit is used in many receivers and radio tape recorders of the middle class, produced, in particular, under the Sharp brand. Unlike the TA2003r chip, on which the previous receiver described by the author was built, the TA8184r allows direct connection of the IF circuits to the outputs of the AM and FM mixers, which made it possible to increase the sensitivity and selectivity of the new receiver.

The electrical circuit of the radio receiver is shown in the figure. The TA8184r (DA1) microcircuit is included here according to the standard scheme, only the APCG circuit of the VHF path is excluded. The supply voltage, current consumption and pin assignment of the microcircuit are the same as those of the TA2003r [1]. The receiver is designed to receive radio stations in the range of medium (526,5 ... 1606,5 kHz) and ultrashort (88 ... 108 MHz) waves. In the first case, reception is carried out on the internal magnetic antenna WA2, and in the second - on the external WA1. Maximum output power - 70 ... 80 mW, quiescent current in AM mode - no more than 15, FM - 20 mA. The receiver is powered by two elements 316 (R6). Its performance is maintained when the supply voltage is reduced to 1,6 ... 1,7 V.

(click to enlarge)

The sensitivity and selectivity of the receiver is approximately the same as that of the modified TA2003r receiver [2]. Since this microcircuit is described in detail in [1, 2], we will only consider the differences between the standard inclusion TA8184r and TA2003r.

The output of the VHF path mixer is connected to pin 3 of the TA8184r chip (see figure). An L2C1 IF circuit is connected to it, tuned to a frequency of 10,7 MHz and connected to the positive (common) power wire. Through the coupling coil L1 and the resistor R1, the IF FM path signal is fed to the piezoelectric filter Z1, also tuned to a frequency of 10,7 MHz. From its output, the IF signal is fed to pin 8 of the DA1 chip, connected to the input of the IF amplifier. The circuit of the FM discriminator L7C15, tuned to a frequency of 10,7 MHz, is connected between pin 10 of DA1 and the positive power wire. Pin 4 of DA1 is connected to part of the turns of the coil L5 of the IF AM circuit of the L5C2 path. From the coupling coil L4 through the resistor R2, the IF signal is fed to the piezoelectric filter Z2. Its operating frequency can be in the range of 455...465 kHz, depending on the selected filter type. From the Z2 output, the AM signal of the IF path enters the input of its IF amplifier - pin 7 of the DA1 chip.

The radio receiver was assembled on a printed circuit board measuring 82x77 mm in a case from the Zvyozdochka radio designer. The functions of its external antenna were performed by a piece of insulated stranded wire 80 cm long. The coil of the magnetic antenna was wound with PELSHO 0,12 wire on a movable frame, put on a ferrite rod HH400 30 long and 8 mm in diameter and contains 110 turns with a tap from the 10th turn. The coil has five sections of wire wound in bulk, the length of the winding is 20 mm.

Shielded contour coils of the IF path AM (L5) and FM (L2), local oscillator AM (L9), FM discriminator (L7) - imported, dimensions 10x10x13 mm. Coils are marked as follows: L2 - orange, L5 - yellow, L7 - green (or blue), L9 - red [3]. Capacitors C1, C2 and C15 are built-in.

With the KPE C10 capacity indicated on the diagram, the L9 coil contains 95-100, and L8 - 9-10 turns of PEV-0,1 wire. The loop coil is wound over the coupling coil. The remaining radio components are described in detail in [1, 2].

The assembly and adjustment of the radio receiver begins with the AF amplifier. After checking it [1, 2], they start desoldering the parts of the RF path. Having tuned in to any station in the CB band, using the L5C2 contour trimmer, they achieve maximum reception volume. Then the CB range is laid. The FM path tuning begins with the antenna turned off. By rotating the trimmer, the L2C1 IF circuit is tuned, focusing on the maximum noise level at the receiver output. Then an external antenna is connected and the FM path is tuned, as described in [1 and 2].

Literature

1. Panshin A. AM-FM radio receiver with low-voltage power supply. - Radio, 1997, No. 9, p. 23-25.
2. Panshin A. AM-FM radio receiver with low-voltage power supply. Back to what was printed. - Radio, 1998, No. 9, p. 22.
3. Panshin A. Color marking of contour coils of imported radio receivers. - Radio, 1998, No. 10, p. 26.

Author: A. Panshin, Moscow

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