Power amplifier electronic circuits-tube audio rf amplifiers

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

March 18th, 2008

Stereo preamplifier circuit with Tone control

About the circuit.

Here is the circuit of a stereo preamplifier circuit with built in tone control facility.A very useful circuit using versatile tone control IC TDA 1524 from Phillips.

The circuit is designed as per the data sheet as an effective stereo-tone & volume control for car stereos , TV sets or  any sort of stereo amplifier circuit you want.The circuit  includes provisions like bass control, treble control , volume control with inbuilt contour or linear mode option (can be switched in betwwen) and balance. All these functions provided can be controlled by DC  voltages or by  linear potentiometers.

Circuit Diagram & Parts List .


Tips .

  1. R1 ,R2 ,R3 andR4  can be used for controlling volume,balance ,treble and bass respectively.
  2. If SPDT  switch S1 is in position 1 ,the circuit works in contour mode and  in position 2 the circuit works in linear mode.
  3. The circuit can be powered from 7.5  to 12 V DC supply.  Do not give more than12V.

TDA1524 quick reference data .


March 18th, 2008

2×22 W stereo amplifier

About the Circuit

This is the circuit diagram of a powerful and good quality stereo amplifier using IC TDA 1554.Even though the circuit has only very few external components.The circuit delivers a 2×22 W out put on 4 Ohm speakers.The most great factor is that it operates from a 12 V power supply, which makes it ideal for car stereos.

My experience with the circuit

The circuit was designed as per the data sheet and so there was no room for error, and I found it working great.But it didn’t last long because I raised the power supply to 40V and the IC blowed up. Lesson : Don’t give more than 18V power supply to TDA1554!

Circuit Diagram & Parts



There is a lot of heat generated during the operation of IC , so it must be connected to a suitable heat sink. A small cabinet fan can also be used in addition for better cooling(not necessary)..The circuit draws about 6A current at 12 V at full out put power.So the power supply must be some thing that shoul be able to deliver more than 6A at 12 V.The maximum rated supply voltage for TDA 1554 is 18V.Do not give more than that.I recommend 12 V.