vglaso - I have emailed you several times at the email you used to sign up for DIYaudio. You should check it.
Uriah
Uriah
Is there a chance I can get just the parts to fix my non-working MyRef.
If any buyers want to back out, can I get in ?
If any buyers want to back out, can I get in ?
I am still interested but I don't know what you are expecting from me? Can you send me an email with the shipment cost to Switzerland if you want me to make a Paypal payment? It is the first time I participate to a group buy... Thanks
Marc
Marc
Marc, you have your email feature turned off. Send me a message through regular e-mail at ps@cs.caltech.edu so we have your e-mail message.
We will send out paypal invoices and in particular for the non-US mailings they will have individually tailored shipping costs.
Peter
We will send out paypal invoices and in particular for the non-US mailings they will have individually tailored shipping costs.
Peter
Current status
Just a quick update.
I got all the parts of the tweaked BOM and have Uriah's second board (he had 2 prototypes). I will put everything together to do one (hopefully final) verification. Everyone cross your fingers that this will all happen today.
As soon as we are sure of the final parts (I had to change vendors on some parts etc. -- a pain...), we'll send out paypal invoices.
Hang in there!
And Merry Christmas!
peter
Just a quick update.
I got all the parts of the tweaked BOM and have Uriah's second board (he had 2 prototypes). I will put everything together to do one (hopefully final) verification. Everyone cross your fingers that this will all happen today.
As soon as we are sure of the final parts (I had to change vendors on some parts etc. -- a pain...), we'll send out paypal invoices.
Hang in there!
And Merry Christmas!
peter
udailey said:
OK - Thanks anyway... If anyone backs out, add me to 'still interested' list.
Thanks,
And I hope you had a great Christmas!
Re: Right on !
I am afraid it is. Only the finest equipment in my house! 🙂
I presume everyone is burning to get my impressions of the sound... Truth be told, listening only to a single channel I find it hard to say anything about subtle qualities since I am too used to hearing both channels of my music... Short of that though I can tell you the thing rocks!
peter
Ouch! 🙂argofanatic said:
I am afraid it is. Only the finest equipment in my house! 🙂
I presume everyone is burning to get my impressions of the sound... Truth be told, listening only to a single channel I find it hard to say anything about subtle qualities since I am too used to hearing both channels of my music... Short of that though I can tell you the thing rocks!
peter
pictures
Some more pictures if anyone cares: http://picasaweb.google.com/schro20/My_refRevCPrototypeBuildII# . Note that this is one of the two prototype boards that Uriah had initially ordered (he populated the other one and we discovered some problems with the BOM; these are now fixed). The final product will have solder masks and silk. 🙂
The heatsink on there I got from Steve at ApexJr. btw.
It's been running at 75% volume for the past few hours with no problems whatsoever. The chip gets pretty warm (the orientation of the fins is bad in the picture; the convective flow is greatly reduced when they go horizontal; for final installation they should probably be vertical). But there's been no heat shut downs, so the chip seems happy. And the sound is quite nice, I gotta say. It took maybe a half hour before it had settled. I imagine it'll settle more, but the differences are not so pronounced at this point that I could tell (plus the whole mono versus stereo issue...). They are driving one of my FE207e Metronomes now.
The toroid you see there is a 300VA from Antek. That thing is WAY too big for my taste. I know that some people prefer hugely beefy toroids. I personally don't. I will run this baby off of a 100VA (one for each board) and report back on that. Steve at ApexJr has a bunch of those at a very good price (I'll pick one of those up on Monday). Whatever happened to the possibility of someone else scaring up toroids? (Just curious; I am not about to enter that line of business...)
I can report that all the parts fit just fine this time around. There are two caps which have 5mm lead spacing but the holes in the board are 7.5mm apart. A little bending resolved that. We opted for bigger size female Faston connectors in this version. Near the main electrolytics they are spaced very tightly and one needs to give the nylon at the top a squeeze with the pliers to make it oval (from round). See some of the earlier pictures and then the later pictures (I've added captions to point this out). Once you give them that squeeze everything is happy in there. The advantage is that these Fastons are 14-16 gauge and have good insulation all around.
What else... Sharp eyes will spot some Panas-FC in there now! 🙂 Santa brought those (they are part of the current BOM).
We are getting very close now.
Peter
Some more pictures if anyone cares: http://picasaweb.google.com/schro20/My_refRevCPrototypeBuildII# . Note that this is one of the two prototype boards that Uriah had initially ordered (he populated the other one and we discovered some problems with the BOM; these are now fixed). The final product will have solder masks and silk. 🙂
The heatsink on there I got from Steve at ApexJr. btw.
It's been running at 75% volume for the past few hours with no problems whatsoever. The chip gets pretty warm (the orientation of the fins is bad in the picture; the convective flow is greatly reduced when they go horizontal; for final installation they should probably be vertical). But there's been no heat shut downs, so the chip seems happy. And the sound is quite nice, I gotta say. It took maybe a half hour before it had settled. I imagine it'll settle more, but the differences are not so pronounced at this point that I could tell (plus the whole mono versus stereo issue...). They are driving one of my FE207e Metronomes now.
The toroid you see there is a 300VA from Antek. That thing is WAY too big for my taste. I know that some people prefer hugely beefy toroids. I personally don't. I will run this baby off of a 100VA (one for each board) and report back on that. Steve at ApexJr has a bunch of those at a very good price (I'll pick one of those up on Monday). Whatever happened to the possibility of someone else scaring up toroids? (Just curious; I am not about to enter that line of business...)
I can report that all the parts fit just fine this time around. There are two caps which have 5mm lead spacing but the holes in the board are 7.5mm apart. A little bending resolved that. We opted for bigger size female Faston connectors in this version. Near the main electrolytics they are spaced very tightly and one needs to give the nylon at the top a squeeze with the pliers to make it oval (from round). See some of the earlier pictures and then the later pictures (I've added captions to point this out). Once you give them that squeeze everything is happy in there. The advantage is that these Fastons are 14-16 gauge and have good insulation all around.
What else... Sharp eyes will spot some Panas-FC in there now! 🙂 Santa brought those (they are part of the current BOM).
We are getting very close now.
Peter
Hello,
in both Uriah and Peter protototypes the LM3386 is the uninsulated version (LM3886T).
If LM3886T is used in the final BOM, are also the insulator pad and shoulder washer included?
Thanks in advance
in both Uriah and Peter protototypes the LM3386 is the uninsulated version (LM3886T).
If LM3886T is used in the final BOM, are also the insulator pad and shoulder washer included?
Thanks in advance
Yes. We definitely want people to be safe if they want to insulate (heat transfer is better without, but then you don't want anything touching it...) Also with the uninsulated one you can't put two on the same heatsink without insulation.ClaveFremen said:
We will provide insulation.
Peter
Here is the BOM. We have noticed some volatility in vendors availability of some of the parts so while this is the BOM we want it may vary very slightly due to parts availability. We will do our best to meet or beat quality if this does happen with any part.
Number Desc 1 Desc 2
D2-D3-D4 1N4001 Fairchild
Q2-Q3 BC546 Fairchild
Q1 BC639 Fairchild
ZD1, ZD2 BZX85C12 Fairchild
C4, C5 100nF AVX Boxed Metal Film 100V 10% Lead Free
C7, C17, C18, C19, C20, C21 220nf AVX Boxed Metal Film 63V 10% Lead Free
C10 22pF Kemet Golden Max 200V 5%
C12 220pF Vishay/BC Mono Kap 100V 5%
C13 1uF Kemet MKP 275V 20%
C14,C1,C2,C9 220uF Panasonic FC 50V 20%
C3, C8 10000uF Cornell Dubilier 50V 20%
C15 22uF Nichicon 50V 20%
C6, C11, C16 100uF Panasonic FC 35V 20%
C34 10pF Kemet MLCC 200V 5%
C30 1nF Epcos MKT 100V 5%
C32 150pF Kemet Golden Max 200V 5%
U1 LM318N National Semiconductor
IC1-2 LM3886 National Semiconductor
D1 GBJ1504 Taitron
R5, R8 22K1 IRC 1/4W 0.1%
R6, R9 47K5 IRC 1/4W 0.1%
R2 33K Xicon 1/4W 1%
R7 12K0 Xicon 1/4W 1%
R10 390 Xicon 1/4W 1%
R11 1 KOA Speer 1/4W 1%
R12,R37 3K32 Xicon 1/4W 1%
R13 100K Xicon 1/4W 1%
R15, R16 75K Xicon 1/4W 1%
R19 10K Xicon 1/4W 1%
R20 47K Xicon 1/4W 1%
R21 220K Xicon 1/4W 1%
R22 8K2 Xicon 1/4W 1%
R39 470K Xicon 1/4W 1%
R43 22K Xicon 1/4W 1%
R42 47 Xicon 1/4W 1%
R23 6K8 Xicon 1/2W 1%
R1, R4 1K Yageo 2W 5%
R14 470 Xicon 1W 5%
R3 0.47 Xicon 7W Radial Cement Resistors 5%
RELAY1 SPDT 24VDC Omron
PL1-8 Keystone Electronics Quick Fit Terminals .250
FPL1-8 Molex Fully Insulated Terminals quick disconnect 14-16 AWG
I okayed the boards and they are on their way.
Uriah
edit: Well I tried to add spaces to make the columns uniform. Does not format so well in the final post does it 🙂 ?
Number Desc 1 Desc 2
D2-D3-D4 1N4001 Fairchild
Q2-Q3 BC546 Fairchild
Q1 BC639 Fairchild
ZD1, ZD2 BZX85C12 Fairchild
C4, C5 100nF AVX Boxed Metal Film 100V 10% Lead Free
C7, C17, C18, C19, C20, C21 220nf AVX Boxed Metal Film 63V 10% Lead Free
C10 22pF Kemet Golden Max 200V 5%
C12 220pF Vishay/BC Mono Kap 100V 5%
C13 1uF Kemet MKP 275V 20%
C14,C1,C2,C9 220uF Panasonic FC 50V 20%
C3, C8 10000uF Cornell Dubilier 50V 20%
C15 22uF Nichicon 50V 20%
C6, C11, C16 100uF Panasonic FC 35V 20%
C34 10pF Kemet MLCC 200V 5%
C30 1nF Epcos MKT 100V 5%
C32 150pF Kemet Golden Max 200V 5%
U1 LM318N National Semiconductor
IC1-2 LM3886 National Semiconductor
D1 GBJ1504 Taitron
R5, R8 22K1 IRC 1/4W 0.1%
R6, R9 47K5 IRC 1/4W 0.1%
R2 33K Xicon 1/4W 1%
R7 12K0 Xicon 1/4W 1%
R10 390 Xicon 1/4W 1%
R11 1 KOA Speer 1/4W 1%
R12,R37 3K32 Xicon 1/4W 1%
R13 100K Xicon 1/4W 1%
R15, R16 75K Xicon 1/4W 1%
R19 10K Xicon 1/4W 1%
R20 47K Xicon 1/4W 1%
R21 220K Xicon 1/4W 1%
R22 8K2 Xicon 1/4W 1%
R39 470K Xicon 1/4W 1%
R43 22K Xicon 1/4W 1%
R42 47 Xicon 1/4W 1%
R23 6K8 Xicon 1/2W 1%
R1, R4 1K Yageo 2W 5%
R14 470 Xicon 1W 5%
R3 0.47 Xicon 7W Radial Cement Resistors 5%
RELAY1 SPDT 24VDC Omron
PL1-8 Keystone Electronics Quick Fit Terminals .250
FPL1-8 Molex Fully Insulated Terminals quick disconnect 14-16 AWG
I okayed the boards and they are on their way.
Uriah
edit: Well I tried to add spaces to make the columns uniform. Does not format so well in the final post does it 🙂 ?
".....The toroid you see there is a 300VA from Antek. That thing is WAY too big for my taste. I know that some people prefer hugely beefy toroids. I personally don't. I will run this baby off of a 100VA (one for each board) and report back on that. Steve at ApexJr has a bunch of those at a very good price (I'll pick one of those up on Monday). Whatever happened to the possibility of someone else scaring up toroids? (Just curious; I am not about to enter that line of business...)......"
Steve Dunlap has the 200VA toroids that would be ideal. $25+shping.
Steve Dunlap has the 200VA toroids that would be ideal. $25+shping.
That sounds like a good deal. Dual primaries?troystg said:
For those who may want to get one, how should they go about it?
Peter
I am going to start a group buy for those from Steve in a few days. Was expecting to do so sooner but holidays and family have taken most of my time recently. I will do an initial group buy/gaging interest for 30 of them for 22 each. I think they are actually 160VA each but they are not your normal toroid. They are special made for Steves amps and are meant for audio. So, I expect great things and who doesnt need more chip amp toroids anyway?!
Uriah
Uriah
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