Power amplifier electronic circuits-tube audio rf amplifiers

Electronic Amplifier Circuits-Power amplifier, audio amplifier designs and circuits

April 27th, 2010

IC TDA 2003 Amplifier

Circuit Description

The circuit diagram of 10W amplifier using TDA 2003 has been published here. This simple amplifier circuit is based on a central IC TDA 2003 developed by SGS Thomson. This IC has some advanced features like short circuit protection, thermal overload protection, low harmonic and cross over distortions etc. This circuit is designed after the datasheet of IC TDA 2003 provided by the vendor.

In this circuit, gain of the amplifier is determined by the resistors R2 (220 ohm) and R3 (2.2 ohm). The upper cut off frequency is determined by capacitor C3 (39 nF) and resistor R1 (39 ohm). The stability of the amplifier at high frequencies is accomplished by capacitor C6 () and resistor R4 (1 ohm). Input DC decoupling is done by capacitor C7 (10 uF) and output is coupled to the speaker by C5 (100 uF).

18V DC supply is used in this circuit to give power. Adequate heat sinks must be provided for TDA 2003. This amplifier delivers maximum power of 10W to a 4 ohm load at 18V supply. This IC has an advantage of working in a range of supply voltage from 12 V to 18V. In order to get maximum performance of this circuit on PCB, input and output grounds must be properly decoupled.

Circuit Diagram

IC TDA 2003 Amplifier

IC TDA 2003 Amplifier

Notes

  • Use a good quality PCB to assemble this circuit.
  • IC TDA 2003 is suitable for car audio systems.
  • Adequate heat sink should be provided for TDA 2003.
April 25th, 2010

40 Watts Audio Amplifier Using IC TDA 2030

Circuit Description

The circuit diagram given below represents 40W audio amplifier. This 40W power amplifier circuit is designed using IC TDA 2030 and two transistors as main components. The IC TDA 2030 is the core part of this circuit because it plays the main role in voltage amplification. The job of current amplification is done by the two transistors. Adequate heat sinks should be provided for IC and both transistors.

The input signal is fed to the non- inverting terminal (pin 1) of TDA 2030 IC through the decoupling capacitor C5 (470 nF). When voltage amplification is performed by TDA 2030, the power supply current to IC changes with respect to the variation in the input signal. The variations in positive and negative supply pins of the IC are coupled to transistors Q1 (BD 712) and Q2 (BD 711). These transistors are connected complementary to each other in circuit so that they perform current amplification.

Power supply for the circuit can be 12V to 40V. Use 40V supply and 4 Ohms speaker for maximum output. To optimize the circuit performance, input and output grounds must be properly decoupled.

Circuit Diagram

40 Watts Audio Amplifier Using TDA 2030

40 Watts Audio Amplifier Using TDA 2030

Notes

  • Use a good quality PCB to assemble components for this circuit.
  • Make PCB tracks broader through which high current flows.

April 22nd, 2010

6 Watt Amplifier Circuit

Circuit Description

The circuit diagram of 6W amplifier using TA 7222AP is given here. This circuit uses integrated audio amplifier IC TA 7222AP as its central part. This is a famous and widely used amplifier IC developed by Toshiba. The unique features of this IC make it suitable for amplifier circuits. The features include short circuit protection, thermal protection, high ripple rejection, low distortion, muting function etc. A suitable heat sink should be provided for this IC to operate safely.

12V DC power supply is used for powering this circuit. The audio amplifier IC TA 7222AP can deliver a maximum output power of up to 5.8 Watts to a 4 ohm load if the supply voltage is 12V. This amplifier is well suited for car radio applications because it can operate in a range of voltage, i.e. from 8V to 12V. In order to get maximum desired performance for this circuit, provide separate ground for input and output.

Circuit Diagram

6 watt amplifier

6 watt amplifier

Notes

  • Us good quality Vero board. To assemble components for this particular circuit.
  • The speaker K1 used here can be 4 ohm.