Someone tryed this?

[MaXiZ]

Some one tryed this?
I've build it.. PSU is a SMPS at +20@8,5A enough i think..
BUt when i connect the power amp the car stereo turn off and nevere turn on again once i disconnect the power amp...
I've thought that maybe the smps but without the power amp it's all ok.. And this happen when i connet the positive and gnd to power amp.. If i connect only the negative and gnd the stereo remain on but without any sound...
What's maybe wrong?

[GregGC]

Originally posted by MaXiZ
Some one tryed this?
I've build it.. PSU is a SMPS at +20@8,5A enough i think..
BUt when i connect the power amp the car stereo turn off and nevere turn on again once i disconnect the power amp...
I've thought that maybe the smps but without the power amp it's all ok.. And this happen when i connet the positive and gnd to power amp.. If i connect only the negative and gnd the stereo remain on but without any sound...
What's maybe wrong?

On the amp SCH it sais +/-V. Are you using single voltage supply (0/+20V). If that's the case you really need a output cap. I don't think I understand well your setup.

Greg

[MaXiZ]

If that's the case you really need a output cap

Exactly

Are you using single voltage supply (0/+20V).

Where should i put this?

I don't think I understand well your setup

I'm not an engeneer! Sorry!

[li_gangyi]

he's asking if you use dual or single supplies...and if you have an output cap (or is considering one) and can you describe the whole setup u plan to use for us??

[MaXiZ]

sorry!
I use ONE car battery that is directly connected to a car stereo, the SMPS is connected to it and give +/-20@8.5A with 4.400uF per rail.
At the moment for a test i would use this setup..
Car stereo=>Power Amp (tda1514)=>Speaker

[GregGC]

Originally posted by MaXiZ
sorry!
I use ONE car battery that is directly connected to a car stereo, the SMPS is connected to it and give +/-20@8.5A with 4.400uF per rail.
At the moment for a test i would use this setup..
Car stereo=>Power Amp (tda1514)=>Speaker

Just finished drawing that. and then I red your answer. So forget about my crappy art.

It is a gnd problem I think. Is the GND (-) of the battery connected to the gnd of the SMPS power supplay, or they have no internal connection?

The IC pack is connected internaly to -V. Where did you mount the IC. Is it mounted on heatsink touching the gnd. I suspect something to do with that (since I cant see the actual setup).

[MaXiZ]

or they have no internal connection

This mean that i mustn't take ur schematic?

Is the GND (-) of the battery connected to the gnd of the SMPS power supplay

naturally yes! Why?

or they have no internal connection

What does this mean?

Is it mounted on heatsink touching the gnd

I've looke and don't seems to me...

since I cant see the actual setup

Do u mean how the component are mounted?

[MaXiZ]

and i've noticed another thing...
i've made a test to see if there's a gnd problem as u say..
If IC is connected seems like + & - are directly connected, instead without it like there's a 2000K resistor...
Contact me privatly too.. if u can..
icq:47573544
mail:maxiz@inwind.it

[Lars Clausen]

If you are going to use a chip amp like TDA1514 you might as well buy it here: http://www.elmatrd.ro/amplificatoare.html
the price is the lowest ever seen.

1000000 Romanian Lei is equal to 29 US$

[JojoD818]

Maxiz,

Are you sure you checked your connections? If you made a pcb, please try to check your paths. Remember, if an amp is designed to be fed with split supplies, NEVER connect only one rail at a time.

Is a non-smps supply available, a lower voltage maybe? this can help in trouble shooting alot.

JojoD