40W amplifier using TDA1514

jacky April 7, 2010 16 Comments

Description.
Many electronic circuits dealing with audio amplifier circuits have been published here. This is just another one and here we use the TDA 1514 high performance hi-fi amplifier from Philips. The IC has a bunch of useful features like thermal protection, mute-standby facility, low harmonic distortion etc. The amplifier operates from a dual +25/-25 V DC power supply and can deliver 40Watts output power to an 8 ohm speaker.

The audio signal to be amplified is fed to pin 1 of the IC and the capacitor C2 acts as a DC de-coupler. The resistors R3 and R4 determine the closed loop gain and it can be varied between 20 and 64 dB. Resistor R2 and capacitor C4 forms a Zobel network which corrects the loudspeaker impedance and improves the frequency response. Resistors R7, R6 and capacitor C5 are the boot-strap elements. If boot-strapping is not needed then these components can be omitted and the pin7 can be connected to pin 6, but the output power will be reduced by some 10%. R1 is the input bias resistor and it has an effect on the input impedance.

Circuit diagram.

40 watt amplifier using TDA1514

Notes.

  • Assembling the circuit on a good quality PCB will improve the sound quality.
  • Use a +25/-25V DC, 4A dual power supply for powering the circuit.
  • K1 can be an 8 ohm, 50W loud speaker.
  • IC1 must be fitted with a proper heat sink.
Comments
  • Roy
    July 23, 2015

    Hallo, I got power supply that have 24V +/- & 1Amp Current. Is it OK or i Have to feat a 24V +/- & 4Amp. 24V 4amp power supply is not in marker and any website delivery service is not able in my city. if my power supply is not enough for this circuit then I don’t make this for my Sub woofer. help me Please …..

  • Ashok
    February 25, 2015

    Hi, need some help with this Amplifier circuit board. I am doing this as a hobby and need complete component list with all the ratings. As you have started online store i am glad to buy the components online. Also kindly quote an approximate price for the complete components.

    Ashok

  • vicky
    October 28, 2013

    i want audio network board circuit and also circuit to split voice from input(mid range)

  • Jonathan
    May 3, 2013

    R6 should be at least 2watt, R7 & R2 1W, the others can be any size. I avoid carbon resistors in small signal (inputs) applications because they can be noisy.

  • AWUNI C.
    April 23, 2013

    I WANT A DIAGRAM AND LIST OF COMPONENTS ON HOW TO BUILD AMPLIFIER USING TDA1519A…THANKS

  • Georgioto
    February 14, 2012

    Hi Mr. Seetharaman can specify wattage of resistor which one is 5W,2W,1W 1/2W or 1/4W..
    Thanks…

  • Thomas
    January 17, 2012

    Admin Please write to me the voltage of each capacitor unit

  • Seetharaman
    November 10, 2011

    Hi Michael power supply filter capacitors should a minimum of 4700uF 40volts, one each for the positive and negative supply. Ensure the supply line from filter capacitor to IC board is wired with >1mm dia wire and not more than 4″ in length.Still if you have some RF interferece from any near by source include 2.2K ohms 1/4 resistance between R1 and C1 this with capacitor C1 will act as a HF filter.

    • Ashok
      February 25, 2015

      Hello sir, is there anyone from Bangalore where i can get some help ??

  • MICHAEL A.
    November 9, 2011

    TANKS FOR UR CCT. I HAVE CONSTR. THE AMPLIFER AND IT WORK BUT NOISE IS TOO MUCH. PLS CAN U SPECIFIED THE CAPACITOR TO USE IN A POWER SUPPLY

  • Jonathan
    June 9, 2011

    An input potentiometer for gain would be connected before C2, with the wiper going to C2. Use a 10k audio (log) taper, or if you want to use a high resistance, say 50k, change R1 to 50k and C1 to 50pF.

  • Jonathan
    April 26, 2011

    C3 & C5 should be 25V, C7 at least 63V.

  • philippe
    February 7, 2011

    where i connect the potentiometer

  • Jonathan
    February 3, 2011

    You really need to give voltages for the electrolytics. Also, just what size is a “proper” heatsink? And the power supply of 50v total x 4A would be 200w: wouldn’t half that be plenty for a 40w output?

    • admin
      February 3, 2011

      electrolytics can be rated 10 or 15V

      Heatsink can be a 4x2x2 inch or higher inch Finned Al type. (there is no such thing as a heat sink that is too large)

  • September 21, 2010

    Thanks for this idea , Actually am searching for a circuit i can use to monitor a charging, when the device is fully charge it should cut off wth a relay inbuilt and when the voltage drops the charging should continues, just an intermediary between the main source and the ups for or inverter

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