There may then have been revision downward of specs, this is the one I am looking at, which is current at retailers: http://www.farnell.com/datasheets/1762787.pdf
The high rail voltage is probably not causing the output problem. At +/- 45 V you will need a VERY big heatsink. My guess would be 3 to 4 times bigger than at +/- 22 V. Look how close the two chips are placed. This will again double the amount of thermal energy.
The ground loop breaker (R6) as used here is asking for problems like negative rail at output. The resister fails and your speaker goes up in smoke.
When you draw a single channel schematic, you may not see the interaction of the two channels. With this design both of the feedback currents (L+R channel)
flow through R6 or even worse the current may find an alternative route.
The ground loop breaker (R6) as used here is asking for problems like negative rail at output. The resister fails and your speaker goes up in smoke.
When you draw a single channel schematic, you may not see the interaction of the two channels. With this design both of the feedback currents (L+R channel)
flow through R6 or even worse the current may find an alternative route.
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I was build the same circuit as it shown and you must have potentiometer on input or connect input with cca 20kohm resistor to gnd.For me this amp works well with +/- 35 VDC .
Regards
zoky2
Regards
zoky2
nice thanks , zoky2,
I will try tomorrow,
I been building another build with lm3886 and supply with 46 volt with no problem,
sounded perfekt. 🙂
but i have 2 cards with components i want to have sound on,
to 45 volt on speaker port.. .🙂
I will try tomorrow,
I been building another build with lm3886 and supply with 46 volt with no problem,
sounded perfekt. 🙂
but i have 2 cards with components i want to have sound on,
to 45 volt on speaker port.. .🙂
ok, thanks everybody.
now i seen my mistake,
When i did my board with potenismeter, it was a short in the audio input,
so i did not connect any potensiometer at audio in so zoky2 was totally right here,
I had all volt on speaker out, but now when i put 20k ohm on both signal in to gnd,
it work.. 🙂
thanks for all help to everybody. 🙂
but +-44 volt work fine, but read that its better to lower voltage, so thats what up next.
now i seen my mistake,
When i did my board with potenismeter, it was a short in the audio input,
so i did not connect any potensiometer at audio in so zoky2 was totally right here,
I had all volt on speaker out, but now when i put 20k ohm on both signal in to gnd,
it work.. 🙂
thanks for all help to everybody. 🙂
but +-44 volt work fine, but read that its better to lower voltage, so thats what up next.
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