Nice layout!. It is indeed possible (with few mods) to separate i/p ground and power gnd on your layout. nice🙂. But don't know if that is required as most APEX layouts recently seem to have them combined.
reg
Prasi
Nice pcb, thanks. You have wrong notification for outputs 2SA1943 instead 2SA1940 and 10R/1W work with 1mW disipation so you don't need 1W resistors, 0,25W will be ok.
Regards
Attachments
I am getting confusing info here because I am seeing that IRFP240/9240 are lateral MOSFET's. They are actually used in many Pass class A amps.
Where does it say they are vertical topology?
Ok I see it now. The vertical hexfets can be used for audio but need a very high bias current bordering on heater class A operation to be linear.
sir, what is the rms power output in 4 /2ohoms speaker if I use 55 0 55v/1000va transformer in apex bx20 amps?
No need but you can thermally couple Q1-Q2, Q4-Q5 and Q8-Q9.
Last edited:
Hi,
Am no expert Jaun,But I did try both the options and definitely there is an advantage in coupling them thermally !!
Without coupling I got a DC offset of -20-40mv and after coupling I got -2mv !!
Regards.
Am no expert Jaun,But I did try both the options and definitely there is an advantage in coupling them thermally !!
Without coupling I got a DC offset of -20-40mv and after coupling I got -2mv !!
Regards.
Attachments
Hi,
No need to thank as I/we have to thank you for all the help and support that have providing/ed
!
Am sorry but there was a small mistake in my post above,When I say thermal coupling,I just put both on a same heatsink (as opposed to attaching both face to face) Q8&9 that is,Where as Q1-2,4-5,6-7 I coupled it treditionally (put them face to face,It was mother of all pain as the layout is not designed for the same,In the bargain broke legs multiple devices 😛). Q6-7 might not yeild any postive result but I still went for it just cause..............
If you match them then almost 0 Dc offset is possible,I myself without matching got almost -0.9mv at one point before breaking the legs
!
Hope this helps and I have not caused any problems with my above post.
Regards.
No need to thank as I/we have to thank you for all the help and support that have providing/ed
!Am sorry but there was a small mistake in my post above,When I say thermal coupling,I just put both on a same heatsink (as opposed to attaching both face to face) Q8&9 that is,Where as Q1-2,4-5,6-7 I coupled it treditionally (put them face to face,It was mother of all pain as the layout is not designed for the same,In the bargain broke legs multiple devices 😛). Q6-7 might not yeild any postive result but I still went for it just cause..............
If you match them then almost 0 Dc offset is possible,I myself without matching got almost -0.9mv at one point before breaking the legs
!Hope this helps and I have not caused any problems with my above post.
Regards.
Last edited: