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Old 7th June 2012, 08:44 PM   #121
massimo is offline massimo  Italy
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OK, I'll keep it between you and me (and a few hundreds other readers)

Subbu might (and I say might) design a small pcb that fit the DAC pcb DC input pins as a daughterboard. Just for a DIL14 socket, 6 component, 4 diodes and a filter cap.
Something that can be drawn in a couple of days and possibly ordered immediately in order to be shipped togheter with the mains pcbs.

BTW, I've just found an old MC1723CP in my junk bin... production code 1987!
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Old 7th June 2012, 09:08 PM   #122
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LM723 is the TDA1541A of regulators.... they are very good and way better than 78XX/LM317/LDOs and just look at their price. Best quality/price ratio in regs ever. Let's keep this in a small circle or prices will go up.

When you see Subbu you can tell him that I already designed a nice LM723 based power supply PCB with onboard transformer in the same format as the DAC PCB. But that again is between you and me OK ?

The 1987 MC1723CP's are double crowns ! Is it the rare gold pin variant ?
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Last edited by jean-paul; 7th June 2012 at 09:36 PM.
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Old 7th June 2012, 09:14 PM   #123
massimo is offline massimo  Italy
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Quote:
Originally Posted by jean-paul View Post
LM1084 is more noisy than 7805.....it is a 5A reg which seems overkill too.
I was wrong: I meant LM1086, 1,5A LDO
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Old 7th June 2012, 09:17 PM   #124
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Also more noisy than OnSemi 7805... With a 9V transformer an LDO is not needed. It is like Cola Light/Diet Cola: when you are not fat you don't need it.
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Last edited by jean-paul; 7th June 2012 at 09:26 PM.
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Old 7th June 2012, 09:49 PM   #125
massimo is offline massimo  Italy
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Quote:
Originally Posted by jean-paul View Post
The 1987 MC1723CP's are double crowns ! Is it the rare gold pin variant ?
... and maybe brown ceramic case? No, tin pins, std plastic case. Nice should be the round, military version. LM723H if I'm not wrong.
Also found a couple of NOS Fairchild uA723PC made in Korea in 1985

P.S. I hate any cola
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Old 8th June 2012, 03:26 AM   #126
syklab is offline syklab  Hong Kong
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Hi,
I saw there is an optional block with U7 and C30 reserved for balance out from the picture, which reg was planed for U7 (the same 3.3V) ? How do you get balanced output from the analog out ?

Thanks
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Old 8th June 2012, 05:02 AM   #127
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You will need 2 PCBs. One completely stuffed and one partly. The boards will be coupled. Details will follow. U7 is an inverter not a reg.
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Last edited by jean-paul; 8th June 2012 at 05:05 AM.
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Old 8th June 2012, 07:08 AM   #128
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We are in the process of making a build guide with the schematics. Will email it to all the members of the group buy soon. The build guide should answer most of the questions.

-Subbu
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Old 8th June 2012, 07:15 AM   #129
syklab is offline syklab  Hong Kong
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Subbu,

Thanks.
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Old 8th June 2012, 09:39 AM   #130
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Anybody interested in a case grop buy?
Case for the Dac of course. I will be making about 10 for me.
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