PA ultra-CPI

Description: Component selection and installation requirements for a full complementary symmetry amplifier should be noted. It is essential to use high-frequency diodes or high-frequency transistors with a knot instead for the two secondary diodes. The installation of transistors VT1, VT2, and amplifier tube VT11 must be thermally coupled with VT12 to stabilize the quiescent current. The circuit configuration indicates that the quiescent current of the open-loop amplifier tubes VT11 and VT12 is determined by the constant current source, which is composed of VT1 and VT2. During debugging, the potentiometer Rl and resistor R3 should be adjusted. The test resistance should be greater than the actual measured value of the constant current, which is set at 2mA. After repeated adjustments of the two potentiometers, the final stage current should reach 100mA, and the output midpoint voltage should be zero volts. After adjusting and exchanging fixed resistors, the circuit can be put into normal use, with an output power greater than 50W and a voltage gain of 2.

The full complementary symmetry amplifier is designed to provide high fidelity and efficient amplification of audio signals. This type of amplifier employs a pair of complementary transistors (NPN and PNP) to enhance performance and minimize distortion. The selection of components is critical, particularly in high-frequency applications, where the response of diodes and transistors can significantly affect the overall performance.

The thermal coupling of transistors VT1, VT2, and the amplifier tube VT11 with VT12 is a crucial design consideration. This thermal coupling helps maintain a stable quiescent current, which is vital for preventing thermal runaway and ensuring consistent amplifier performance. The quiescent current is set by the constant current source formed by VT1 and VT2, which establishes the operating point of the amplifier.

During the debugging process, careful attention must be paid to the adjustments of the potentiometers Rl and R3. The resistance values should be calibrated such that the constant current is maintained at 2mA. This ensures that the amplifier operates within its desired parameters. The final stage of the amplifier is designed to output a current of 100mA, which is essential for driving speakers or other loads effectively.

Once the adjustments are complete, the output midpoint voltage should be confirmed at zero volts, indicating that the amplifier is properly biased. This is critical for ensuring that the amplifier operates linearly and does not introduce unwanted distortion into the audio signal. After verifying these parameters, the circuit can be utilized for normal operation, delivering an output power exceeding 50W and achieving a voltage gain of 2, making it suitable for a variety of audio amplification applications.Component selection and installation requirements and general as full complementary symmetry amplifier. T should be noted that the two second diodes should be used in high-freq uency diode, or high-frequency transistor with a knot instead. VT1, VT2 and amplifier tube VT11, the installation must be thermally coupled VT12 to stabilize the quiescent current. It is seen by the circuit configuration, when the open-loop amplifier tube VT11, VT12 quiescent current of the constant current source, respectively, by the VT1, VT2 composition decision given.

When debugging, Rl, R3 potentiometer in place, the test should be larger j than the actual measured value of the resistance value of the constant current of 2mA when repeatedly adjusting section two potentiometers, so the final stage current lOOmA, output midpoint electric voltage is zero volt outlet after adjusting exchange fixed resistors, can be put into normal use q the circuit output power greater than 50w, voltage gain of 2