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
Thanks to ChrissMmm I have started my AX14 build.[emoji16]
I had to order more tombstone resistors in 0.33r. The 0.22r is for the Honey Badger that I'm also building (green board).
I had to order more tombstone resistors in 0.33r. The 0.22r is for the Honey Badger that I'm also building (green board).
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🙏🙏
Last edited:
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!
So what I've worked out is I need decent caps for the follow positions.
C1 - 10UF
C2 - 100pf
C7 - 47pf
C8 - 100nf
C14 - 100nf
C1 - 10UF
C2 - 100pf
C7 - 47pf
C8 - 100nf
C14 - 100nf
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.