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ACP+ Preamp/HPA for Yarra Preamp
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Old 10th August 2020, 05:50 AM   #41
xrk971 is offline xrk971  United States
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ACP+ Preamp/HPA for Yarra Preamp
Yes, but still trying to get a cost estimate on providing SMT pre-populated ones.
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Old 10th August 2020, 03:50 PM   #42
jwjarch is offline jwjarch  United States
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ACP+ Preamp/HPA for Yarra Preamp
No problem X. If you think the price would come down significantly I may be interested in pre-populated boards too.
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Old 10th August 2020, 05:11 PM   #43
Itsmee is offline Itsmee  England
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ACP+ Preamp/HPA for Yarra Preamp
MShipmanPE / SMT Prepopulated / 2 boards/ USA
Carl_Huff / bare PCB / 2 boards / USA
mnichols30030 / bare PCB / 2 boards/ USA
Thompsontechs / bare PCB / 2 boards / USA God Bless it in these trying times!
Aljordan / SMT Prepopulated / 2 boards / USA
Pwagner / SMT Prepopulated (if enough interest) / 2 boards / USA
jwjarch / bare PCB / 2 boards / USA
meanie / SMT Prepopulated / 2 boards / SGP
diy40 / SMT Prepopulated / 2 boards / USA
Itsmee / SMT Prepopulated / 2 boards / UK
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Old 10th August 2020, 05:44 PM   #44
xrk971 is offline xrk971  United States
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Hi folks,
Thanks for all the interest in the SMT prepopulated boards. At this point, I think we don't have enough for an automated pick-n-place machine made board yet. So these will be hand soldered using solder paste and a hot air station. They will look nice though - similar to what you see in Post #1. Since these are hand made, the total cost of a prepopulated SMT board including all SMT parts (Mouser BOM) plus the PCB is $52ea. The bare PCB is the usual $12ea for the Yarra (M2X bolt hole) format boards.

They will look like this:
Click the image to open in full size.

I am still figuring out what resistor values will be needed to drop the bias current down a bit as 140mA is rather high and only needed for a headphone amp. For preamp duties, 70mA should be more than enough and cut heat by 4x less.
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Old 10th August 2020, 06:56 PM   #45
jwjarch is offline jwjarch  United States
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ACP+ Preamp/HPA for Yarra Preamp
Beautiful looking boards as always, X and JPS. FYI, the IL217AT optocouplers are out of stock at Mouser but looks like they will be getting more in stock on 09/25.
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Old 12th September 2020, 05:14 AM   #46
dBel84 is offline dBel84  United States
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I finally tested my boards that I had very foolishly installed the wrong mosfets - great news is that they are dead silent when hooked up as a headphone amp and sound fantastic. Thanks X for putting this together..dB
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Old 13th September 2020, 04:15 PM   #47
xrk971 is offline xrk971  United States
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Glad you are enjoying the ACP+ preamp as a headphone amp. It’s quite capable and great sounding as a headphone amp. It looks like there is some interest in the SMT prepop’d version. Not quite enough for a production run from a fab house yet but maybe I can do a small manual pick and place run.
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Old 30th September 2020, 04:00 PM   #48
xrk971 is offline xrk971  United States
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Hi Folks,
This is the final call for interest on this GB for SMT prepopulated ACP+ boards. Per the cost estimate above, SMT prepopulated boards are $52 ea using Mouser BOM and soldered using solder paste with stencil and hot air. Bare PCBs are $12ea. I will put a pre-order listing in my Etsy shop soon.
Thank you fro your intrest,
X

Current interest list:
Quote:
MShipmanPE / SMT Prepopulated / 2 boards/ USA
Carl_Huff / bare PCB / 2 boards / USA
mnichols30030 / bare PCB / 2 boards/ USA
Thompsontechs / bare PCB / 2 boards / USA God Bless it in these trying times!
Aljordan / SMT Prepopulated / 2 boards / USA
Pwagner / SMT Prepopulated (if enough interest) / 2 boards / USA
jwjarch / bare PCB / 2 boards / USA
meanie / SMT Prepopulated / 2 boards / SGP
diy40 / SMT Prepopulated / 2 boards / USA
Itsmee / SMT Prepopulated / 2 boards / UK
12 SMT prepopulated boards
8 bare boards
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Last edited by xrk971; 30th September 2020 at 04:02 PM.
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Old 1st October 2020, 03:11 AM   #49
Bones13 is offline Bones13  United States
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Please put me down for a pair of pre-populated boards. Thanks.
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Old 18th November 2020, 11:45 AM   #50
Bones13 is offline Bones13  United States
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Bump? Anything happening here?
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