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Old 27th November 2003, 10:26 AM   #1
MaXiZ is offline MaXiZ  Italy
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Question Someone tryed this?

Click the image to open in full size.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?
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Old 27th November 2003, 02:42 PM   #2
GregGC is offline GregGC  Canada
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Default Re: Someone tryed this?

Quote:
Originally posted by MaXiZ
Click the image to open in full size.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
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Old 27th November 2003, 04:26 PM   #3
MaXiZ is offline MaXiZ  Italy
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Quote:
If that's the case you really need a output cap
Exactly
Quote:
Are you using single voltage supply (0/+20V).
Where should i put this?
Quote:
I don't think I understand well your setup
I'm not an engeneer! Sorry!
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Old 27th November 2003, 04:44 PM   #4
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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??
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Old 27th November 2003, 04:52 PM   #5
MaXiZ is offline MaXiZ  Italy
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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
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Old 27th November 2003, 05:17 PM   #6
GregGC is offline GregGC  Canada
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Quote:
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).
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Old 27th November 2003, 05:29 PM   #7
MaXiZ is offline MaXiZ  Italy
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Quote:
or they have no internal connection
This mean that i mustn't take ur schematic?
Quote:
Is the GND (-) of the battery connected to the gnd of the SMPS power supplay
naturally yes! Why?
Quote:
or they have no internal connection
What does this mean?
Quote:
Is it mounted on heatsink touching the gnd
I've looke and don't seems to me...
Quote:
since I cant see the actual setup
Do u mean how the component are mounted?
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Old 27th November 2003, 06:20 PM   #8
MaXiZ is offline MaXiZ  Italy
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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
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Old 27th November 2003, 11:36 PM   #9
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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$
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Old 28th November 2003, 02:24 AM   #10
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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
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