my younger brother just finished putting together his GC and he has it hooked up to this speaker but it doesnt even have enough power (with no volume selector even attatched) to get that speaker to a normal quiet listening level? what could be wrong?
No. The protection sounds NASTY and it will be obvious that it's kicking in. And it will take at least a few secs for the thermal protection to kick in as well.
I reckon the gain is wrong. Check the resistors that determine the gain.
There is the alternative small possibility that the input impedance is too low hence attenuating the input signal too much, a wrong value resistor again.
I reckon the gain is wrong. Check the resistors that determine the gain.
There is the alternative small possibility that the input impedance is too low hence attenuating the input signal too much, a wrong value resistor again.
Chris8sirhC said:
what's the voltage on the +/- rails? Plug into this spreadsheet the device you are using (3875?) and rail voltage and you can see how much power to expect out of the device:
http://www.national.com/appinfo/audio/files/Overture_Design_Guide13.xls
Hi Chris8sirhC,
A thin sheet might not be good enough for the heat sink. I have a fairly chunky heat sink with fins that is not enough.
Look at my post :
http://www.diyaudio.com/forums/showthread.php?postid=479079#post479079
Like others said the gain may also be wrong .
But better fix the heat sink first.
Cheers,
Ashok.
A thin sheet might not be good enough for the heat sink. I have a fairly chunky heat sink with fins that is not enough.
Look at my post :
http://www.diyaudio.com/forums/showthread.php?postid=479079#post479079
Like others said the gain may also be wrong .
But better fix the heat sink first.
Cheers,
Ashok.
I'm pretty sure its a resistor problem from what everyone has described. I let him read through this and he is now out in the garage with the soldering iron heating up... At one point when we switched some stuff around, im pretty sure we heard the thermal warning thing bc the sound started switching on and off real quick and the chip was burning hot as soon as we turned it on. I think in that case something had gotten wired wrong.
well i wont be able to find out for a while, bc he's convinced he is going to fry it from overheating if he tests it out without a giant class A heatsink. What we are using now is about 1/8'' thick, a foot long and half a foot wide. Before we switched some stuff around that time, it barely got warm after two songs. ill let you know if switching the resistors worked whenever we get to test it
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