HF amplifier with low distortion. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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Characterization
1. Nominal frequency range, Hz,
with a frequency response unevenness of not more than 0.2 dB ..... 20 - 35000
2. Rated output power, W, at a load with a resistance of 4 Ohm ..... 70
3. Harmonic coefficient, %, in the rated frequency range at the level of - 3 dB from the rated output power..... 0.014
4. The coefficient of intermodulation distortion,%, when tested with signals with a frequency of 250 and 8000 Hz (amplitude ratio 4:1)..... 0.06
5. Rated output voltage, V.....0.7
6. Input resistance, kOhm ..... 30
7. Relative noise level, dB.....- 98
8. Depth of the general environmental protection, dB..... 25
9. Output voltage slew rate, V/µs, at dummy load with disconnected capacitors C2,C6.....40
Details
1. V1-V3, V11 - KT503D
2. V4, V5 - KD509A
3. V6, V10, V16 - KT815G (set KT817V)
4. V7 - D814G
5. V8, V9, V17 - KT814G (set KT816V)
6. V12, V13 - KS133A
7. V14, V15, V20, V21 - KD229B (set KD202)
8. V18 - KT819G
9. V19 - KT818G
Transistor V11 is mounted on a radiator next to V18, V19. Radiator area for one channel 400 cm2. Resistor R6 sets the "zero" potential at the output of the amplifier. Resistor R18 sets the quiescent current of the terminal stage.
Publication: cxem.net
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