IF audio converter 6,5 MHz to 5,5 MHz. Scheme, description

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IF audio converter 6,5 MHz to 5,5 MHz. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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Your attention is invited to a simple, but fairly well-proven circuit for an IF sound converter from 6,5 MHz to 5,5 MHz. I have tried many circuit solutions, but I stopped on this one, because almost all of its elements are widely available, and the converter starts working without any settings.

The K174UR2 chip is an IF amplifier for the image channel of television receivers. In a typical inclusion, it, as a rule, is turned on according to a circuit with a balanced input.

IF audio converter 6,5 MHz to 5,5 MHz

In our case (see figure), the microcircuit is connected according to a simplified circuit with an asymmetric input. Conclusion 1 (input of the IF) and conclusions 2. 15 (filter of the CFO circuit) are grounded through capacitors C3 and C5, C4, respectively. AGC pins 5 and 6 are not used. The horizontal sync input (pin 7) is grounded. Resistor R8 is connected to pins 9 and 9 instead of a circuit. Resistor R7 sets the maximum gain. At the input of the IF (pin 16) through the capacitor C1, a signal is supplied from the output of the television tuner, amplified and fed through a 6,5 MHz band-pass piezo filter to the base of the transistor VT1, on which a 12 MHz generator is assembled. The frequency is stabilized by a ZQ2 quartz resonator. Thus, the difference frequency is obtained at the output: f2=f-f1 = 12MHz-6,5MHz=5,5MHz. This sound IF passes through a ZQ3 piezo band pass filter to the TV or VCR IF filter.

Details, design: C1, C8, C9 - CT-1; C7 - K50-35, K50-16, all other capacitors - K73-17, KM-6, KM-5; All resistors - MLT 0,125; ZQ1 - FP1P8-62.02 (yellow and white dots) or SFE 6,5 M; ZQ3 - FP1P8-62.01 (yellow dot) or SFE 5,5 M; VT1 - KT312, KT315 with any letter index. The converter is assembled on a printed circuit board measuring 45x40 mm. The converter board is installed in a VCR or TV as follows: 1. The board itself is carefully soldered from above to the tuner; 2. Pin 1 of the board is connected with a short wire to the tuner's IF pin; 3. Output 2 of the board - with a 12 V tuner output. 4. Pin 3 of the board - with a 5,5 MHz IF filter input on the VCR or TV board. In conclusion, I want to note that I installed this converter in many imported TVs and VCRs and showed itself from the very best side.

Author: V.Kravchuk, Brest; Publication: N. Bolshakov, rf.atnn.ru

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