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digi01 9th November 2005 05:18 AM

VBITNGC building & comment
dear all,
the thread is starting for vgitngc project assembly & developent.

project antetype below:
T-network: the better feedback solution?
Projects for next hollidays (the world smallest VBITNGC??)
pcb boards set group order below:
VBITNGC group buy


digi01 9th November 2005 05:34 AM

2 Attachment(s)
step by step assembly with photos.
the vbitngc has 3 units.the first assembly is tube buffer unit.

Part list below:
Tube PCB *1
10K 2W*2
3.3K 0.4W*2
1uf 200V mkp *2 *
the sch of tube buffer and amp

the tube that I used is 6922.the coupling caps is 2 ero 0.47uf160v connected in parallel per channel.

the source of suitable tube sockets:
thanks dave

digi01 9th November 2005 05:52 AM

2 Attachment(s)
the connection wires(from psu to amp) should be get ready now.there are 9 wires,I think the length 150(mm)-300(mm) is pretty.
the high current wires(3) is 1.2mm diameter.the others are 0.6mm diameter.I use the teflon cable.

digi01 9th November 2005 05:54 AM

2 Attachment(s)
buffer with cables.

digi01 9th November 2005 05:59 AM

2 Attachment(s)
the coupling caps sets up at the bottom of pcb.
OK,then the tube buffer is completed!


digi01 10th November 2005 04:58 AM

2 Attachment(s)
the second assembly is amp unit.
The parts for the amps board were printed by their value on the boards.
Part list below:
LM3875TF *2
50K log Poti stereo *1
330uF / 35V low ESR *4
180R 0.4W 1% *2
18K 0.4W 1% *6
47K 0.4W 1% *2

the bypass caps that I used is Fc 100uf/35V.

digi01 10th November 2005 05:01 AM

2 Attachment(s)
the bottom view of amp board,I have not set up the 'T' network.

digi01 10th November 2005 05:03 AM

2 Attachment(s)
buffer has set up on the amp.

Evilsizer 10th November 2005 05:06 AM

looks good any pics of the housing your going to put it in?

Upupa Epops 10th November 2005 05:26 AM

Digi, do you have a submarine ?:bigeyes:

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