hi Apex,
can I ask for PCB lay-out for D200.1? I would like to build your class d amp..
thanks..🙂
sir QQ,
can I ask your PCB lay-out of d200.2. I would like to build d200.2.
thanks...
hi apexaudio,
ml3 is not working with d class making strange noise en increasing the vol same wen increasing treble.tested with irs1500 as well the same situation.
thanks
ravs......
ml3 is not working with d class making strange noise en increasing the vol same wen increasing treble.tested with irs1500 as well the same situation.
thanks
ravs......
Can you tell me what is the size of the PCB?
I tried D200 pcb and couldn't match CI pins with pcb's holes. My pcb is 15/6,5 cm. There are two ways of facing 2n5401&78l05 ; Which one is ok?
Ifound this amp on other forum but I can't understand (even using google translate )🙁
I tried D200 pcb and couldn't match CI pins with pcb's holes. My pcb is 15/6,5 cm. There are two ways of facing 2n5401&78l05 ; Which one is ok?
Ifound this amp on other forum but I can't understand (even using google translate )🙁
Did anyone finished APEX D200.2 ,test it, and can say: It's OK?It's working!
D200;D200.1 report OK.how about this one?
D200;D200.1 report OK.how about this one?
D200, D200.1 and D200.2 is same amp just pcb is litle diferent... use BD241C instead IRF640 for 12V bias regulator in D200.1 and D200.2
There is some instability with IRF640 in 12V bias regulator, use BD241C and IRF640N as outputs.
Sound at VERY low levels is ok. After that is very distorted---not sound any more... Only those resistors , (2k2/2w-mine is 2k7/3w)are hot. Every thing else is ice cold! (even tip41c--don't think is ok). I'll check for problems .... 78l05 could be gone bad???? Tomorrow is another day...
i know its totaly off topic and i apologise ,what sort of paper are you using for printing negatives of pcb to(i am assuming that you use photo way of making pcbs /sry on very bad english )...and what type of printer?? everything i try black is not 100% black (you can see trough black) ...yours looks like excellent work
quick q... i would like to use irf740 with this schematics? possible?
thank you and sorry for off topic and bad eng.
quick q... i would like to use irf740 with this schematics? possible?
thank you and sorry for off topic and bad eng.
(P&P tonner transfer,foto paper)
....................
back to measurements.
supply -/+48V
All values are related to gnd(0.0V)
TIP41C C=0.0V
E=-46V
B=-45.5V
[That's not ok , cause it should be E=-36-37V ,B=-36V(12v less , refered to -48V)]
On 78l05 is only 2V😱 less that it stabized V...
After corrected mistake on PCB it(amp) is MUT ,nothing comes out..
Ok now! Working at high levels of output. For me problems came from those 12v zener.(10 pieces=>all faulty, bought them all together).At 10-20W output , fet are warm-hot(no heatsink on) , the same core of the inductor. Is that ok? this is my very first class D amp , so no previous experience..