Sir I need because I made 1 channel .When I unplugged power transistor .Then no short . Serious bulbs light up like normal .But when I add 1 pair bulb full bright.ichek transistor. .That is ok
Not sure what file you need but here is what I have. It is A40 not AX40.
Attachments
after I compare it with my files, the difference is only in R DCoffset,I use 470r as on the layout
it should be 470kOhm or it will be ridiculously heavy to adjust dc offset nice and stable.
Ok I will replace 470r with 470k,
and for bias problems that continue to rise maybe because I use a mje350,340 transistor, bd139 fake.
Thanks for information🙏🙏
https://www.diyaudio.com/forums/attachment.php?attachmentid=769137&stc=1&d=1563503007
This is A40 mine.
This is A40 mine.
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i have made this pcb. i have some problem. there is a continuous noise from speaker when input is not connected. when i connect input, hum remains but very low. i have also tried to connect signal gnd to speaker gnd but the sound goes away. i am using separate adapters to power P30.
Added a few more parts today to my AX14.
I'm stuck on what Resistor I should use for R26. I have a 3w 10r but it's way too big and a 1/2w 10r that seams to fit nicely with the silkscreen. Will a 1w 10r be ok? Or does it really need to be a 2 watt resistor?
I'm struggling to find and caps that are not ceramic for the 47pf (C7)and 100pf (C2, C9, C10).
Also C7 has a long rectangle and looks weird with a tiny ceramic in it. I'm trying not to have to order online again and local store is sparse. I may have to take my multimeter in with me and get serious. Lol.
By the way I used 1n4007 instead of 1n4004 for the diodes.
Tomorrow all my radial caps and output transistors arrive. I do have a ton of the other resistors i.e. BC547 / BC557, MJE340 / MJE350 from my local electronics store.
Thanks lads!
I'm stuck on what Resistor I should use for R26. I have a 3w 10r but it's way too big and a 1/2w 10r that seams to fit nicely with the silkscreen. Will a 1w 10r be ok? Or does it really need to be a 2 watt resistor?
I'm struggling to find and caps that are not ceramic for the 47pf (C7)and 100pf (C2, C9, C10).
Also C7 has a long rectangle and looks weird with a tiny ceramic in it. I'm trying not to have to order online again and local store is sparse. I may have to take my multimeter in with me and get serious. Lol.
By the way I used 1n4007 instead of 1n4004 for the diodes.
Tomorrow all my radial caps and output transistors arrive. I do have a ton of the other resistors i.e. BC547 / BC557, MJE340 / MJE350 from my local electronics store.
Thanks lads!
I am planning these - from Digi-Key.com:
C1 - 10UF --- Nichicon UES1E100MDM1TD
C2 - 100pf --- Kemet C317C101J2G5TA
C7 - 47pf --- Cornell Dubilier CD15ED470JO3
C8 - 100nf --- Wima MKS2D031001A00MSSD
C14 - 100nf --- Panasonic ECW-F2104JAQ
all are pretty reasonable except "C7" which is $2/each, other option at DK is Kemet but it is $3/each - yikes! Hope that helps.
I also had problem with bias until I had MJE15034-35 as drivers. when I replaced them with 2SA\2SC drivers as in schematic I had no bias problem.