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Amp Camp Pre+Headphone Amp - ACP+
Amp Camp Pre+Headphone Amp - ACP+
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Old 24th May 2020, 04:26 PM   #341
withmatt is offline withmatt  South Korea
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Default ACP+ PCB Updates.

While I was building another ACP+, I had difficulty to get exact 10mA CCS with J113.
On-semi J113 with 121ohm only had 7-8mA, old stock Vishay J113 had only 5-6mA.
I do not think it is manufacturer dependency, but J113's Vgs/Idss spread.
Getting good combination of J113 and Resistor value will be pain.

I have updates on my ACP+ PCB design.
1. Both Axial and Radial Capacitor can be used for C1. (8mm diameter for Radial Capacitor)
2. J113 now changed to LM317L. J112 (J113) still can be used in reverse direction.
Note 125Ω for R4 is still valid for LM317L also!
3. Trimmer can be mounted in R4's place (3296W) when J112 is used for CCS.
Then the user can set exact 10mA CCS.
Attached Images
File Type: png ACP2.1.png (44.7 KB, 200 views)
File Type: jpg ACP+Schematic5.jpg (113.6 KB, 204 views)
File Type: jpg ACP+Schematic7.jpg (93.7 KB, 205 views)
File Type: jpg ACP+Schematic13.jpg (94.6 KB, 208 views)
Attached Files
File Type: zip ACP_2.1_Gerber.zip (214.2 KB, 21 views)

Last edited by withmatt; 24th May 2020 at 04:29 PM.
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Old 24th May 2020, 05:34 PM   #342
EUVL is offline EUVL  Europe
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Have you compare LM317 to J112 for noise ?

Patrick
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Old 24th May 2020, 10:04 PM   #343
Variac is offline Variac  Costa Rica
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Amp Camp Pre+Headphone Amp - ACP+
But oh so appropriate considering it was unveiled at Burning Amp!

Quote:
Originally Posted by cubicincher View Post
Cool build! Volume pot seems to be hot
Dirk
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2019 Burning Amp is Nov. 9 & 10 in S.F. Thread here on diyAudio:
Burning Amp 2019!!!
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Old 25th May 2020, 04:07 AM   #344
cubicincher is offline cubicincher  Germany
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Default to Variac

Now I understand! Burning amp festival...in the firehouse.

ACP+ is on fire - sound is hot and melting soft like butter in the heat.

Have a good week, Variac!

Greets
Dirk
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Old 25th May 2020, 04:08 AM   #345
Variac is offline Variac  Costa Rica
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Amp Camp Pre+Headphone Amp - ACP+
Thank you! We’re ordering some PCB’s for the store that are the same as at Burning amp. Large, but Mr. Pass likes to spread components out and have some ground plane.
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Burning Amp 2019!!!

Last edited by Variac; 25th May 2020 at 04:16 AM.
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