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Old 19th July 2019, 02:55 AM   #11531
still4given is offline still4given  United States
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Originally Posted by panggih View Post
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Old 19th July 2019, 02:57 AM   #11532
Sunny22g is offline Sunny22g
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the series resistor to offset pot should be 470k.. not 470

Last edited by Sunny22g; 19th July 2019 at 03:00 AM.
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Old 19th July 2019, 03:39 AM   #11533
panggih is offline panggih  Indonesia
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Maybe this is not broken again🙏
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Old 19th July 2019, 05:53 AM   #11534
rehman is offline rehman  Pakistan
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Originally Posted by still4given View Post
I checked and I actually used a modified version of the above layout. I really just simplified a little as Alex had designed it with two different sets of holes for the resistors and caps. I removed the extra holes to make it easier to etch and drill. I am adding those file here.

These are also for toner transfer. I you need photo sense files let me know.
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.
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Old 20th July 2019, 01:41 AM   #11535
wenningtao is offline wenningtao  China
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我们总是必须做出这么多的妥协,而且我们永远不会做出最好的放大器。永远不能成为最好的放大器,没有什么是 完美的。
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Old 20th July 2019, 05:55 AM   #11536
tommeeto is offline tommeeto
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My Apex simple op-amp preamp. Works very well with my SR200. Absolutey zero noise.
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Old Yesterday, 02:59 PM   #11537
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
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!20190722_003742.jpg20190722_003840.jpg20190722_004029.jpg20190722_004148.jpg
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Old Yesterday, 04:36 PM   #11538
HatlessChimp is offline HatlessChimp
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So what I've worked out is I need decent caps for the follow positions.

C1 - 10UF
C2 - 100pf
C7 - 47pf
C8 - 100nf
C14 - 100nfScreenshot_20190722-022940_Gallery.jpgScreenshot_20190722-023101_Gallery.jpg
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Old Yesterday, 05:51 PM   #11539
bullittstang is offline bullittstang  United States
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Originally Posted by HatlessChimp View Post
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
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.
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Old Today, 05:31 AM   #11540
44250 is online now 44250  Serbia
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Quote:
Originally Posted by panggih View Post
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🙏🙏
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.
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