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Hello people,
I recently got 20 PCBs designed manufactured from a professional manufacturer.
After few weeks, I have discovered that the footprint of one of the component is wrong in the PCB.
i.e. a relay has its pins reversed.
It was the designers mistake because, the foot print is given in...
Thanks for the links...
I am not in audio building stuff too. But necessity is the mother of invention right?? :)
I have some idea about the filters as I am an Electronics engg student.
Yeah. I know. Thanks a lot for all your insights into this problem.
I have decided to let it go now & design my own amplifier for those speakers.
Please visit this link and help me out
https://www.edaboard.com/threads/227432/
I would really appreciate your help.
Thanks a lot FvM & SajjadKhan !!
Hi everyone!
I had an Altec Lansing FX5051 system and its amp has gone bad. I m not able to get it repaired from anyone, so I have decided to design my own amp for the speakers which are btw awesome.
Front/Rear Left/Right - all four are 12W @4ohms, 10%THD
Center - 13W @4ohms, 10% THD
Subwoofer...
Thank a lot FvM. That information helped a lot.
But I have still one doubt. The rectifier IC that it uses - RS401L will have a steady DC output right? Hence even if AC input to circuit is 19V rms the output Vcc to amplifier IC should not cross 26V right?
One more doubt - If at all the...
The other side is the metal casing. It is also the heat sink for the amplifier IC.
Its not computer power supply but amplifier of a home theater system.
Sorry I did not understand you. This is the solder side of the PCB showing amplifier ICs TDA8947J. Does the sticky material oozing out near it show that it may be burnt?
Yes. But my chances of replacing that are low as the PCB is quite complicated and lot of components means lot of possibilities (There are two amplifier ICs). Can you suggest some method by which I can be sure that one of the amp ICs is gone bad? Any visual indication?
The PCB area near the amp...
**broken link removed**
I took out the rectifier IC from the PCB and checked. It is not shorted now. But the output traces of rectifier on the PCB are shorted. Can you tell me any method to find out the short?
I think it must be most probable the two capacitors connected to the IC (4700uF...
I have a step down transformer with the following ratings.
Input AC: 230 V / 50 Hz
Output AC: 18.5 V at 5.4 A
It had gone bad a few days back & I got it rewound from a local electrician.
Now when I check the output voltage which comes to 19 V (which I think is acceptable) but I am not sure...
Thanks srizbf and FvM for replying.
@srizbf : The PCB is very complex and it is not possible to isolate each stage and put back again. I ll try out the current probe.
@FvM : I ll try the voltage drop method.
Hi everyone,
I have an Altec Lansing FX5051 Home Theatre System.
Recently the unit stopped working and when I checked it, the fuse on PCB was burnt. After I replaced the fuse, I checked for PCB errors.
Design of PCB
- 240v to 18.5 V 5.4 A step down transformer which connects to a bridge...
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