This 800 Watt power amplifier circuit operates in class AB, unlike the 800W high power amplifier using MOSFET. It boasts an impressive power efficiency of up to 85 percent. The circuit features high output power amplifiers, making it ideal for outdoor applications. Make sure to pair it with a loudspeaker that can handle the power output. The required working voltage is a symmetrical voltage of ±70 Volts.
Generating high output power is possible by utilizing a portion of the accumulated power from the final amplifier transistor that is arranged in parallel. This approach offers a clear advantage over using just a single transistor for amplification.
Design of an OCL power amplifier with 800 Watts output
The OCL circuit of a 800 Watt power amplifier is essentially the same as a general OCL circuit. It incorporates a differential circuit as the initial front amplifier (Pre-Amp), followed by the driver and final amplifier sections. The only difference lies in the type of transistors used and some adjustments made to the working voltage of each amplifier section.
As depicted in the circuit schematic drawings above, the differential amplifier section consists of transistors Q1, Q2, and Q3. This differential amplifier acts as a front amplifier (Pre-Amp) before entering the driver stage. The final amplifier is configured in Darlington to achieve higher gains. Furthermore, to further enhance the amplification, additional transistors are connected in parallel with the final amplifier transistor.
The P1 trimpot potentiometer resistor is used to regulate the working bias of the driver circuit. By adjusting the potentiometer P1, you can achieve the best sound quality from this amplifier circuit. It's important to note that if the working voltage supplied to the transistor is too high, the sound will be more linear but there may be a hum. This can also cause the final amplifier transistor to overheat and potentially get damaged if left for a long time. On the other hand, if the bias of the driver transistor is set too low, it may result in disabled sound.
In a final amplifier setup with multiple transistors in parallel, a shortage can lead to uneven heat distribution, concentrating on one or two transistors only. This results in an uneven distribution of heat across the transistors in the amplifier. However, all the necessary final amplifier transistors are equipped with sufficient cooling fins. Additionally, make sure to include mica insulators for each transistor at both ends of the power amplifier circuit for this 800 Watt OCL setup.
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