TDA2030 for 3w speaker

[maher471]

hi for all,
can any one help me, i have a complete pcb made with two tda2030 recovered from a broken stereo systems but i need to connect it to 3w speaker only, so how can i adapt it and what is the recommadation for the powersupply(voltage and current),

thanks for all in advance

[Loudthud]

Post a picture and note the value and voltage of any large capacitors. Note that there is a TDA2030 and a TDA2030A. The A version is rated for more power. What impedance is your speaker? A single rail 12V or 15V supply will probably allow a single chip to make 3W.

[maher471]

hi Mr Loud Thud, thanks for your reply, I have made some photo, and for the speaker is 3w 4R and the amplifier use 2x12v AC in, for the output capacitor it is directly connected to the speaker.

[maher471]

just for the 2 large capacitors are 25v 3300uf used for power supply AC filtering.

[KatieandDad]

The simplest way is just to not turn it up too loud.

I know that sounds flippant but try considering just limiting the input signal.

You could fit a resistor in series with the volume control for example.

The TDA2030 is rated at 18W in its H form.

If the volume control is 10K, placing a 10K resistor in series with it will limit the power to 1.8W.

[maher471]

thanks Mr KatieandDad, good idea, I will try it, but I have read in the in the datasheet for TDA2030 the minimum power describes in the fig. 1 in Page. 4 is 4w for +-Vs=8v for 4R speaker, and I am not sure if I use +-6v for 3w output are ideal or not for the global quality of sound, another little question if I use +-6v AC transformer what current I need 'because I have a little transformer 2x6A 0.8A

[maher471]

"2x6V"

[Arty]

output power you need multiplyd by 2 will allways be enough for powersupply side of things.
example, one needs mmm.. 2x 6 watt, then its 12w*2 = 24 VA psu.
Divide this by the voltage required by the amp, let it be for sake of example 10 volts.
Tadaaa,, 2.4 A current rating is surely enough.

Most probably the 3 watt speaker you have will take less than 3 watt input power.
I would not go verry close to minimum PSU voltage, nor maximum.
Stay at a healthy +-12 DC as supply voltgae for the chip.
IF, You find it way too easy to overdrive the speakers, then use a voltage divider at the input to reduce input signal.

Regarding Your little transformer, is that 2x6 V DC, or AC ?
If it is AC, then it will work. And current rating is allso okay.
If it is DC, then it is a bit on the edge of usability, chipamps do not like to be operated close to minimum supply voltage.

[KatieandDad]

Give the amp room to work at its best and limit how you use it.

[maher471]

thanks 1000 Mr Arty for those details.