32 Watt Audio Amplifier menggunkan IC TDA2050

There is a circuit uses a high quality audio amplifier IC TDA2050. The power amplifier can provide 32 watt rms into 4ohm load and 25 watt rms into 8ohm. The circuit features low harmonic and crossover distortion and a low external component count.

Skema rangkaian TDA2050 Power Amplifier

Voltage gain is 27dB as shown, but this can be changed by using a different value resistor for the feedback path (R4, currently 22k, between pins 2 and 4). The amplifier must not be operated at any gain less than 10 (20dB) as set by R4 and R5, as it will oscillate. In some cases, an inductor may be needed in series with the output to prevent instability with capacitive loads (10 turns of 0.5mm wire wound around a 10 Ohm 1W resistor). The most common capacitive load is the speaker cable itself, and 'audiophile' leads are often worse than standard grade cables in this respect.

The 1 Ohm resistor (R6) should be a 1W or 0.5W type, and all others should be 1/4W 1% metal film (as I always recommend). All electrolytic capacitors should be rated at 50V if at all possible, and the 100nF (0.1uF) caps for the supplies should be as close as possible to the IC to prevent oscillation. C1 should be a bipolar (non-polarised) electrolytic, or may be plastic film if you prefer.

The supply voltage should be about ±25 Volts at full load, which will let this little guy provide a maximum of 25 Watts (rated minimum output at 25°C). To enable maximum power, it is important to get the lowest possible case to heatsink thermal resistance. This will be achieved by mounting with no insulating mica washer, but be warned that the heatsink will be at the -ve supply voltage and will have to be insulated from the chassis.

Layout PCB Amplifier TDA2050

Parameter IC TDA 2050




Supply Voltage........................................... ±25 V.
Input Voltage............................................... VS.
Differential Input Voltage............................. ±15 V.
Output Peak Current (internally limited)........ 5 A.
Power Dissipation TCASE = 75°C.................. 25 W.
Storage and Junction Temperature............. -40 to 150 °C.
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