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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Old 9th February 2018, 12:11 AM   #251
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
PCB shipment has arrived at DHL hub in Cincinnati OH - delivery by evening tomorrow.
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Old 9th February 2018, 02:40 AM   #252
pcgab is offline pcgab  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by xrk971 View Post
PCB shipment has arrived at DHL hub in Cincinnati OH - delivery by evening tomorrow.
Wow, that's fast production!

Awesome news X!
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Old 9th February 2018, 02:52 AM   #253
bk856er is offline bk856er  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
pcgab, your BOM was helpful. Is the 2/2 version still current?


BK
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Old 9th February 2018, 02:12 PM   #254
pcgab is offline pcgab  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
The BOM I attached in post 199:
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier


X can answer better than I certainly. The above is the BOM I used to order. I haven't assembled a prototype and will likely wait for the boards to arrive as they're already shipped to X.
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Old 9th February 2018, 07:19 PM   #255
pcgab is offline pcgab  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
X, hugh, et all:

For C101, would a 330pF 100v FKP2 be ok?
Schematic calls for 220pF. I have 330pF on hand if it will work.


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Old 9th February 2018, 08:06 PM   #256
xrk971 is offline xrk971  United States
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That should be fine. It’s an RF interference filter so you can calculate cutoff frequency with 2k2 in series. 330pF gives 220kHz - should be fine to let high slew rate audio through and keep out RF.
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Old 9th February 2018, 08:16 PM   #257
pcgab is offline pcgab  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Awesome, thank you X!
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Old 9th February 2018, 08:34 PM   #258
pcgab is offline pcgab  United States
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Quote:
Originally Posted by bk856er View Post
pcgab, your BOM was helpful. Is the 2/2 version still current?


BK
I may have missed this in the bom:

C115 1uf 63v MKS4

Looks like the same cap as C121
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Old 10th February 2018, 04:25 AM   #259
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by pcgab View Post
I may have missed this in the bom:

C115 1uf 63v MKS4

Looks like the same cap as C121
Yes, both of those are 1uF MKS bypass caps for the big electrolytics.

The PCBs that JPS64 designed look great. Perhaps one of the prettiest PCBs I have seen. The double thick copper with ENIG finish and blue solder mask work real well together on 2mm thick board. But the star of the show is the crazy intense number of vias that connect parallel thick traces on both sides of the board for the high current flows and the ground plane.

Here are some photos of the boards and a closeup of the backside. I am afraid to ask how many vias that is and how many drill bits may have been used to make all of them?

Top and bottom side:
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier-alpha20-pcb-sample-jpg

Closeup of back side:
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier-alpha20-pcb-closeup-jpg

JPS64 put some reallly nice touches on it: one of my favorites is the choice of spade connectors or flying leads (for the Pass forum diehards) for the power supply and speaker output connections. UMS compliant MOSFET and standoff positions is also another great feature. Options for NP0 SMT caps or silver mica on C105 and C113 are also great choices to have. Nice job JPS64! "
Attached Images
File Type: jpg ALPHA20-PCB-First-Sample.jpg (691.7 KB, 544 views)
File Type: jpg ALPHA20-PCB-Closeup.jpg (392.2 KB, 370 views)
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Last edited by xrk971; 10th February 2018 at 04:33 AM.
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Old 10th February 2018, 04:32 AM   #260
zman01 is offline zman01  Bangladesh
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That's a good looking PCB, X!
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