intex 2.1 speakers repair 2.1 home theater circuit
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Input sound signal flows through VR1 100k volume control up or down.
after that the right and left sound signal goes to sub woofer pre-amplifier through 10k resistors.
R2 AND C1 MID RANGE AND HIGH FREQUENCY COMPENSATION
then sound signal goes to high pass filter, in this section two components connected parallel
R2 8.2K resistor and C1 6.8 KPF disc capacitor, (compensation) this network send high and mid range adjust frequencies equally to amplifier.
R3 LIMIT THE BOTH MID AND HIGH FREQUENCIES
after network R3 6.8K resistor attached to ground to avoid distortion in sound signal, and it balance impedance in network.
C2 INPUT COUPLING CAPACITOR
after that sound signal goes through C2 0.1 MF coupling capacitor it's protect from dc voltage noise, it stop DC voltage and allow to go AC signal.
R4 IMPEDANCE MATCHING
amplifier IC TDA 2030 input pin 1 grounded with R4 10k resistor to avoid distortion sound and matching impedance.
R5 AND C3 FEEDBACK AND GAIN ALSO LOW FREQUENCY
IC TDA pin 2 inverting connected R5 510 OHMES and C3 10MF 25V SERIES and connected ground.
according to C3 capacitor value boosted high or low frequencies, R5 510 ohms balance and adjust the frequencies.
R6 FEED BACK AND GAIN
R6 22K feed back resistor connected output pin 4 TDA 2030 to pin 2 for stabilizes (gain) signal output.
R7 AND C4 ADJUST BAND WIDTH
TDA 2030 pin 4 out put connected R7 3.3ohms resistor and C4 220 KPF series and grounded for to filter high frequences in signals ( blocking oscillation frequencies in sound).
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2.1 home theater speakers power supply (double voltage) |
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2.1 speakers block diagram using tda 2030 and 4558 ic |
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2.1 speakers bass booster and pre amplifier |
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| 2.1 speaker sub woofer and mid and high frequency amplifiers circuit |
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