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xrk971 Pocket Class A Headamp GB

Founder of XSA-Labs
Joined 2012
Paid Member
xrk971 - 2 boards
pcgab - 2 boards - INVOICE SENT & PAYMENT RECEIVED
zman01 - 2 boards - INVOICE SENT & PAYMENT RECEIVED
stellarelephant - 2 boards - INVOICE SENT & RECEIVED
samoloko - 1 pcb - INVOICE SENT & PAYMENT RECEIVED
Morde - 2 board - INVOICE SENT & PAYMENT RECEIVED
cyteen - 2 boards - INVOICE SENT & PAYMENT RECEIVED
funch - 2 boards - INVOICE SENT & PAYMENT RECEIVED
syyma - 2 boards - INVOICE SENT & PAYMENT RECEIVED
av-trouvaille - 2 boards - INVOICE SENT & PAYMENT RECEIVED
Mituisho - 2 boards - INVOICE SENT & PAYMENT RECEIVED
bogde - 2 boards - INVOICE SENT & PAYMENT RECEIVED
faltinsen - 2 boards - INVOICE SENT & PAYMENT RECEIVED
vanofmonks - 1 board - INVOICE SENT & PAYMENT RECEIVED
M_Balou - 2 boards - INVOICE SENT & PAYMENT RECEIVED
dwpeterson - 2 boards - INVOICE SENT & PAYMENT RECEIVED
agdr - 1 board - INVOICE SENT & PAYMENT RECEIVED
walangalam - 2 boards - INVOICE SENT & PAYMENT RECEIVED
gwrskien - 2 boards - INVOICE SENT & PAYMENT RECEIVED
redarc12- 2 boards - INVOICE SENT & PAYMENT RECEIVED
dw1narso - 2 boards - INVOICE SENT & PAYMENT RECEIVED
zimmer64 - 2 boards - INVOICE SENT & PAYMENT RECEIVED
shambala - 2 boards - INVOICE SENT & PAYMENT RECEIVED
HaroldHill - 2 boards - INVOICE SENT & PAYMENT RECEIVED
gig - 2 boards - INVOICE SENT & PAYMENT RECEIVED
hui13 - 2 boards - INVOICE SENT & PAYMENT RECEIVED
pranavkr -1 board - INVOICE SENT & PAYMENT RECEIVED
JimS- 1 board - INVOICE SENT
Kumori - 1 board
1bit - 1 board

Sorry, but we are now out of boards.
 
Founder of XSA-Labs
Joined 2012
Paid Member
I tried to locate "Kester EP623', but Google couldn't find it. Is this the correct PN for a commercially available product? (Nice job on your build, I just want to follow in your footsteps...)

Sorry I goofed that one up. EP256 63/37. I bought it prepacked in a syringe. It comes with several tips.

https://www.amazon.com/gp/aw/d/B006UTCYM2/ref=ya_aw_od_pi?ie=UTF8&psc=1

I got the idea for the hotplate here - it was actually the winner of all the methods. Super fast and easy. Why use a toaster oven?

https://www.sparkfun.com/tutorials/59
 
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Founder of XSA-Labs
Joined 2012
Paid Member
You can use a fry pan and range. Just don't cook with it afterwards. There may be noxious lead fumes so I avoid doing in the kitchen. But yes, a pan and any stove is fine. Watch for solder paste to turn shiny silver and wet parts - once all wetted and solder forms nice fillets on parts and remove and place pan on something like a concrete slab or granite counter to cool it quickly. Once solder is not liquid remove board with tongs etc - try to limit exposure of parts to high heat as much as possible.

It's the same hole pattern as Agdr's Super CMOY. He has a nice template. I can provide link later.
 
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Founder of XSA-Labs
Joined 2012
Paid Member
Just want to let everyone know I have been busy packing the boards for shipment. That's a lot of packing! To pass the time I have been enjoying listening to this amp with my headphones. I am so so happy with the sound quality. Just superb. You guys won't be disappointed. One of the best headamps that I have built despite the small size and power limitations. I should be able to start shipping them out on Monday. :)
 
Founder of XSA-Labs
Joined 2012
Paid Member
Just a note to folks still getting BOM. It's ok to use as large of a cap as you can fit for the corner mounted power rail caps. A larger value gives better stereo crosstalk reduction. I am able to fit 10mm dia x 20mm long 2200uF 16v caps laying on their sides. There is an improvement in imaging, maybe a bit better bass authority as well. Yes, 16v is marginal but a pair of 9v rechargeable Li-ion batteries is 16.7v max and that drops quickly below 16v within 30min of use. If you use alkaline 9v cells I suggest getting a 20v (smaller cap) though.
 
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