| cowanrg |
i just got my boards in for my gainclone project, and i threw one together, and i measured the voltage and got 35V. this seems really high. im using a 24V transformer.
i an unable to get it to play anything at the moment either. it can hum, but thats it. no music comes though it. any ideas anyone? im using peter's schematic, and i have gotten two of these to work previously, but since then, i have built 3, and none of them work? are the transformers too high of voltage? |
|
|
| Mad_K |
| what chip are you using? check, double check and check again the parts and the connections.... |
|
|
| cowanrg |
lm3875.
its such a simple design, its almost impossible to mess up! could someone explain to me (like i was an idiot), how you wire up the power? from the wall to the board (or chip)? im using a bridge rectifier now. |
|
|
| Nuuk |
Cowanrg - are you using a transformer with 24V secondaries? If so your rail voltage will be around 35V! (Secondary voltage X 1.414)
As regards wiring up the PSU, take a look at my GC FAQ page . |
|
|
| ukram |
A power supply picture from finnish LM3886 project:
 |
|
|
| cowanrg |
| i figured it out. i didnt notice that the board had to be grounded as well. i connected the board to the star ground, and all worked fine. thanks everyone. |
|
|
| Llamas |
| I'm trying to track down a hum in my new project. Can you clarify what you mean by grounding the board? |
|
|
|
