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Amp Camp Pre+Headphone Amp - ACP+
Amp Camp Pre+Headphone Amp - ACP+
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Old 31st January 2020, 05:04 PM   #211
kacernator is offline kacernator  Czech Republic
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Join Date: Jan 2008
Default PCB missing capacitor correction

Hi,

I have little error on my PCB, there is missing 220pF cap on input mosfet.
Here is corrected PCB.
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File Type: zip ACP Headphone PCB.zip (214.4 KB, 34 views)
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Old 31st January 2020, 06:40 PM   #212
ergo is online now ergo  Estonia
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Join Date: Mar 2001
Location: Tallinn, Estonia
I've designed an alternate PCB for this nice project.
It's a 160*80mm one sided PCB.

If there is interest and Mr.Pass is ok with it then I can post Gerbers too. One proto has been built and the one mistake I had with traces is fixed in this snapshot... (on real thing the fix is hidden under the board )

PS. I left in an option to cut the GND trace and have a dual polarity supply instead to avoid the output cap... have not tried it myself yet though.
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File Type: png ACP+_PCB_EE.png (184.2 KB, 296 views)
File Type: png ACP+_PCB_EE_proto.png (783.4 KB, 292 views)
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Old 9th February 2020, 04:55 AM   #213
hirscwi is offline hirscwi  United States
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Join Date: Mar 2014
Location: Indianapolis, IN, USA
Amp Camp Pre+Headphone Amp - ACP+
Do I have to worry about counterfeit J113s? Or is most any source on eBay or Amazon likely to be legitimate?

My apologies for a dumb question.

Thanks.
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Old 9th February 2020, 09:12 AM   #214
2 picoDumbs is offline 2 picoDumbs  Australia
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Please buy all your components from Mouser, Digikey, RS Components, Farnell, a diyaudio member or an ebay seller that is confirmed to be legitimate by another diyaudio member.

For things like J113, J112 etc just buy them from Digikey or Mouser.
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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
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Old 9th February 2020, 01:33 PM   #215
hirscwi is offline hirscwi  United States
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Join Date: Mar 2014
Location: Indianapolis, IN, USA
Amp Camp Pre+Headphone Amp - ACP+
Thank you. I normally buy all my parts from Mouser or DigiKey. I thought they didn't have the J113 but I was looking for "2SJ113". Your suggestion prompted me to look for "J113" and of course found it. Thanks for your guidance!

I'm trying to learn PCB layout and this will be a good project for me.

I appreciate everything I learn from this forum and hope that I can contribute back.
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