Mezmerize DCB1 Building Thread - Page 10 - diyAudio
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Old 20th December 2010, 03:44 PM   #91
Horio is offline Horio  United States
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Thanks sir!
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Old 20th December 2010, 03:47 PM   #92
Salas is offline Salas  Greece
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Nearing to see some finished blue Mez?
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Old 20th December 2010, 03:52 PM   #93
Horio is offline Horio  United States
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I'm getting close to finishing populating the boards. I still need to pull two matching sets of (4) 2SK170BL's from (50) I bought from Zhoufang. I've got a couple of transformers coming from Sumr too. Getting closer...
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Old 20th December 2010, 05:15 PM   #94
AndrewT is offline AndrewT  Scotland
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Horio,
there are only two pair (as in the B1) that need selecting for Idss. Idss within 1% is probably close enough, but the two pairs do not need to be exactly equal to each other.
The other jFets do not need precise selection.
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Old 20th December 2010, 08:04 PM   #95
Horio is offline Horio  United States
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Andrew,
Thanks for the advice. It should be easier only having to pull matched pairs that are close instead of a matched quad. I'm doing a balanced build (2 boards), so that's why mentioned two matched sets.
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Old 21st December 2010, 11:29 AM   #96
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Dear All,

I have finished the circuit of my DCB1, just waiting to put it in a box, did not have any chance to use it.

Anyway, as I plan to use it as a pre for a F5, I was thinking of installing a relay on the power switch of the power amp, and derive 12 V from the relay of the delay start. If I got it right, like this I will power on the DCB1 and when the relay will open the power amp will switch on.

Does it make sense ? Is it as easy as I think ? The relay on the F5 will be 12 V as the one on the DCB1.



Thanks,

Davide
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Old 21st December 2010, 09:38 PM   #97
Salas is offline Salas  Greece
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I would prefer you will not drive a further (likely heavier) relay for an F5, because its power consumption and inductance can be overwhelming for the dedicated circuit, which is calculated to control 2 mini relays the most in the Mez's case.
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Old 23rd December 2010, 01:32 PM   #98
ramallo is offline ramallo  Europe
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New born.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

V.out
10.18V pos
-9,66V Neg

Ofset:
R= -1.2 mV
L= 0.5 mV

Tomorrow I'll get a pot and I'll hear it.

Thanks Salas! (And all the other involved).

Last edited by ramallo; 23rd December 2010 at 01:35 PM.
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Old 23rd December 2010, 02:24 PM   #99
Salas is offline Salas  Greece
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Here is a classic Mez again. Long time no see! Pretty in blue.
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Old 24th December 2010, 07:32 AM   #100
bkdog is offline bkdog  Australia
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Default Mes boards arrive

Many thanks to Tea-Bag, my Mesmerize boards arrived today in Australia!

I also, yesterday, just go home from hospital after surgery to reassemble my left wrist - snapped it into a thousand pieces falling over very clumsily... So I won't be building the boards for a few weeks yet.

I know this url http://www.diyaudio.com/forums/blogs...formation.html , but is there a complete circuit of the Mez somewhere with part designations which relate to the PCB?

I am using them on a balanced LDR volume control and I already have input selection so I am only building the buffers and shunt regulators - need to get that bit right.

Great xmas or whatever you do to all, and happy new year, thanks again Tea-Bag,
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