Car Amplifier Circuit TA8210 TDA1524 Tone Control Circuit

2 TA8210 amplifier integrated circuits are used in the car amplifier circuit. TA8210 can operate with a supply voltage between 9…18v. THD value is 0.04%.

At the amplifier input, bass, treble, balance, volume controls are made with the TDA1524 tone control integrated circuit. In addition, a step-down power supply scheme made with LM317 is given for the devices you will use in the audio input (mp3, cd player, etc.).

The amplifier’s design is based on two Toshiba TA8210 integrated circuits. The low cost of the system makes it extremely attractive when creating a simple car amplifier. The TA8210 combines two preamplifiers and the output stage in a bridge circuit, producing 2x22W at a 4 ohm load. This arrangement is perfect for automotive applications:

Supply voltage Vcc=9…18V

Built-in Mute and Standby functions (not used in this project)

Low distortion THD=0.04% (Vcc=13.2V, f=1kHz, Pout=1W)

Low noise VNO=0.3mV (Vcc=13.2V, f=20Hz…20kHz, Pout=1W)

Automatic shutdown in case of overheating, output short circuit and too high supply voltage

The preamplifier was also included in the design of the amplifier. I decided to use the TDA1524 from SGS-Thomson because of its many features, low distortion and low cost. The main features of this system are as follows:

Supply voltage Vcc=3…18V

Low distortion THD=0.3% (Vcc=12V, f=20…20kHz)

Wide range of bass, treble and balance controls

Bass enhancement with an additional two-pole low-pass filter

Low current consumption Icc=35mA

Car amplifier schematic

As you can see, both the TA8210 power amplifiers and the TDA1514 preamplifier operate in a typical configuration. The potentiometers connected to the TDA1524 cube are responsible for adjusting the balance, tone and gain. The dual 2x470k potentiometers distribute the signal between the front and rear speakers. Thanks to this, it is possible to spatially configure the sound intensity for the four speakers. Contour/linear switching is possible only via a direct jumper on the board. Other potentiometers are located on the front panel of the amplifier TA8210 amplifiers are connected to a large heat sink.

In addition, a simple switchable voltage regulator 3V, 5V, 9V and 12V based on the LM317 chip was added to the front panel.

During practical tests with the built-in amplifier, it turned out that electromagnetic interference from the power supply enters the output signal. This effect was audible only when the engine was running. Therefore, I fixed the power supply with an additional anti-interference filter, which can be seen in the picture. Such a filter can be purchased for a small amount in almost any electronics store. The disadvantage of this solution is the low filter power of 50W. I do not rule out purchasing a second filter and separating the power supply of both final stages.

The amplifier works well, but it must be admitted that it is a bit short of the latest Panasonic models :). However, it has several significant advantages, the main of which is probably the satisfaction of building and starting your own structure. The second significant advantage is that external sound sources can be reconfigured for free. One day, semiconductor memories will definitely replace magnetic media and CDs, after which the subsequent audio compression algorithms will compete for the title of “best”, and the amplifier will remain an amplifier.

TA8210 TDA1524 Amplifier Project

Source: http://www.zpcir.ict.pwr.wroc.pl/%7Ejarekp/index.html