complete 70 watt power amplifier schematic

Description: The circuit power amplifier depicted is a schematic design for a power amplifier with an output power of 70 watts, operating in Class AB mode. This power amplifier circuit is equipped with a tone control circuit. The 70-watt power amplifier utilizes an OCL (Output Capacitor Less) configuration and incorporates power transistors of the types TIP2955 and TIP3055. A symmetrical voltage source is required for its operation. The schematic and components list for the 70-watt power amplifier can be referenced in the accompanying image. The tone control circuit employs an active Baxandall tone control design using the LM301 operational amplifier. The tone control section features bass and treble adjustments. The LM301 serves as a pre-amplifier, while the back-end of the active Baxandall filter is also managed by the LM301. The power amplifier circuit is designed to deliver 70 watts of output, functioning in Class AB mode. The power transistors utilized are complementary types, specifically TIP2955 and TIP3055. The power amplifier circuit operates with a symmetrical voltage source of ±25 volts and a current rating of 5 amps. Additionally, the OCL power amplifier circuit is designed to generate a signal spike upon activation; therefore, it is necessary to incorporate a speaker delay circuit protector.

The 70-watt Class AB power amplifier circuit is designed to deliver high-quality audio amplification with minimal distortion. The OCL configuration eliminates the need for output coupling capacitors, which can introduce phase shifts and frequency response issues. This design enhances the overall performance of the amplifier, particularly in the low-frequency range.

The power transistors, TIP2955 and TIP3055, are selected for their high current handling capabilities and thermal stability, making them suitable for audio applications. The complementary configuration of these transistors allows for efficient push-pull operation, which is essential for Class AB amplification. The symmetrical voltage source of ±25 volts ensures that the amplifier can deliver substantial output power while maintaining linearity across the audio spectrum.

The tone control section, utilizing the LM301 operational amplifier, provides a versatile means of adjusting the audio signal. The Baxandall tone control circuit is favored for its smooth response and minimal impact on the audio signal when the tone controls are set to a flat position. The inclusion of bass and treble controls allows users to tailor the sound to their preferences, enhancing the listening experience.

To protect the speakers from potential damage due to power-on transients, the design includes a speaker delay circuit. This circuit ensures that the speakers are only connected after the amplifier has stabilized, preventing any unwanted signal spikes from reaching the speakers.

Overall, this 70-watt power amplifier circuit combines robust design features with user-friendly controls, making it an ideal choice for high-fidelity audio applications. The careful selection of components and thoughtful circuit design contribute to its reliability and performance in various audio setups.Circuit power amplifier circuit in the figure below is a schematic circuit power amplifier with output power of 70 watts and operates on a class AB. Power amplifier Circuit has been equipped with a tone control circuit. Scheme 70 watt power amplifier circuit includes power amplifer types of OCL (Output Capacitor Less) premises using a power transi

stor with the transistor type and TIP2955 TIP3055. This power amplifier Circuit requires a symmetrical voltage source to work. Scheme 70 watt power amplifier circuit and its components list can be viewed directly on the image following a series of power amplifiers. Tone control Circuit for power amplifier uses active tone control baxandall by IC LM301 operational amplifier.

Controller tone on powerr amplifier consists of a tone control bass and treble tone control. IC LM301 front serves as a pre-amplifier and the LM 301 op-amp serves as the back of the active filter baxandall. Power amplifier Circuit used is a type of OCL power amplifier circuit with an output power of 70 watts.

70 watt power amplifier Circuit in the amplifier circuit above works in class AB. Power transistors used in the power amplifier is a power transistor on the type of complementary and TIP2955 TIP3055. 70 watt power amplifier Circuit above uses a symmetrical voltage source with ± 25 volt DC current 5 amps.

70 watt power amplifier Circuit is power OCL which will generate a signal spike when turned on, so it needs to be installed as speaker delay circuit protector.