You need list of amplifiers with threads and post numbers... there is A15 post #8 in this thread CFA mosfet amplifier with mosfet drivers.
I think Andrewlebon will crank out an FH11 in no time once your layout is done. He has been busy - about 2 amps per day as far as I can tell. 🙂
FH9(HV) complete
Hello xrk971!
I'm sorry, but your name was rather hidden in my post. It would be nice if u could give a contribution!
Hello xrk971!
I'm sorry, but your name was rather hidden in my post. It would be nice if u could give a contribution!
Hello Sonal
greetings is it possible to share sprint LAY files for 2 pair version
nothing like a try
warm regards
Andrew
greetings is it possible to share sprint LAY files for 2 pair version
nothing like a try
warm regards
Andrew
This is the old layout that Sonal is working on to correct the flipped electrolytics on. I am looking at it and can't find any other errors, and do see that it is a beautiful layout otherwise. If one was in a hurry, this could be used with a manual (note to self) to flip power rail electrolytics and it should work. It's a surprisingly compact and simple 250w amp though.
Sprint file for FH11. Pdf files will be shared after andrewlebon has tested it.
@andrewlebon If you use with voltage rail of 55v or less then use 1000uF/63v instead of 680uF and 47uF/63v instead of 22uF.
There was one more mistake MJE340 was in place of BD140 and MJE350 in place of BD139.
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Sonal Kunal - thanks! Looks fantastic. 😀
It's very convenient that pin outs for BD139/140, KSC3503/KSA1831, MJE340/350 are the same. Note that on VHEX+ amp, vzaichenko drives a pair of IRFP's with a single KSC/KSA just fine so it may still be suitable to use those drivers. I believe they may have slightly better noise/performance figures over the MJE's.
I have both so it's not an issue - just wondering which will give best performance.
It's very convenient that pin outs for BD139/140, KSC3503/KSA1831, MJE340/350 are the same. Note that on VHEX+ amp, vzaichenko drives a pair of IRFP's with a single KSC/KSA just fine so it may still be suitable to use those drivers. I believe they may have slightly better noise/performance figures over the MJE's.
I have both so it's not an issue - just wondering which will give best performance.
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Hello Sonal
greetings thank you for the lay files and your tips will make pcb today
warm regards
Andrew
greetings thank you for the lay files and your tips will make pcb today
warm regards
Andrew
Thanks - I will have to look into those. I think the 3503/1831 are video drivers and very high slew rate with low capacitance. These drivers have a lot of current capability - probably enough as headphone amps.
When I was making layout I visualized mounting holes on all corners. But with 100x60mm, pcb mounting hole at top is not possible.
I'll make two version.
Regards
Sonal
Thats a wonderful layout sonal
. very compact.. As Mr. Mile says, if it can be made to fit 100mmx 60mm or even 75mm, it will become pcbway/seedstudio friendly😉reg
prasi
I wouldn't dare ask to make it smaller 🙂
If it helps, I am using 1W 0.47R supply resistors in F9HV and they are not even warm. I also don't need/use screw holes on the edge with the OPS.
Beautiful and very builder friendly design though. The 100mmx60mm will mean qnty 10 for $10 from PCBWay 😀
I would like to mention that MPSA92 transistor will be getting quite hot when using high voltage rails and it will require a heatsink, which may present a challenge to some, since it is in a TO-92 package. An alternative would be to use a different transistor in a bigger TO-126 package instead.
2SA/KSA1381 will work, as well as every other TO-126 transistor that's typically used for VAS duty. Obviously PCB would need to be modified to accomodate different transistor.
