Simplistic Mosfet HV Shunt Regs - Page 10 - diyAudio
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Old 18th January 2009, 03:31 PM   #91
JC951t is offline JC951t  Taiwan
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HI PCHW,
Hmmm can't get it to work.

Thanks anyway
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Old 18th January 2009, 06:50 PM   #92
Stixx is offline Stixx  Germany
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It is a
Quote:
The ExpressPCB file.
file I assume,
not jpg or the like...
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Old 18th January 2009, 07:01 PM   #93
wuffer is offline wuffer  Denmark
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Quote:
Board size changed to conform with expresspcb's Mini board service.
That is so nice. Then its just to order it at express pcb
is it correct that you get 3 boards on that service??
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Old 18th January 2009, 08:42 PM   #94
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Quote:
Originally posted by wuffer


That is so nice. Then its just to order it at express pcb
is it correct that you get 3 boards on that service??
Yes, that's my understanding.
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Old 18th January 2009, 09:21 PM   #95
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Yep, you will get 3 boards delivered to your door for $60.85 in the US. I'm not sure what the costs are in other countries is, but the Express PCB program will tell you.

A trick to do on the mini board service is to add the component designators to the top copper layer to help with placing components. Also, you have a lot of space on the board. You can most likely scrunch the parts together on half the board, then copy/paste a second image of the board on the other half. Then you get 6 boards for the price of the mini board service. Just takes a pair of large hand shears to cut the boards apart.

For ideas on top copper layer circuit designators and multiple images on mini boards see the down load area on my web page.

Gary P's DIY page
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Old 19th January 2009, 10:58 AM   #96
wuffer is offline wuffer  Denmark
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Thanks

The R1 sets the mA

The p1 on the boards is the trim??

Is it ok to use 1 board for each channel and only 1 transformer??

How much current do you think should be used for 2 6922 tubes pr channel?? (vacuumstate svp1)
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Old 19th January 2009, 02:27 PM   #97
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Quote:
Originally posted by Gary P
Yep, you will get 3 boards delivered to your door for $60.85 in the US. I'm not sure what the costs are in other countries is, but the Express PCB program will tell you.

A trick to do on the mini board service is to add the component designators to the top copper layer to help with placing components. Also, you have a lot of space on the board. You can most likely scrunch the parts together on half the board, then copy/paste a second image of the board on the other half. Then you get 6 boards for the price of the mini board service. Just takes a pair of large hand shears to cut the boards apart.

For ideas on top copper layer circuit designators and multiple images on mini boards see the down load area on my web page.

Gary P's DIY page
Thanks for the great suggestions. I was able to scrunch the component placement to fit 2 on a board. Any issues with proximity of traces or thermal concerns (with the mosfets and the 5W resistors closer to each other?
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Old 19th January 2009, 02:30 PM   #98
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Quote:
Originally posted by wuffer
Thanks

The R1 sets the mA

The p1 on the boards is the trim??

Is it ok to use 1 board for each channel and only 1 transformer??

How much current do you think should be used for 2 6922 tubes pr channel?? (vacuumstate svp1)
The p1 is the trim. I'll leave it to the more technically knowledgeable to answer the other Qs...
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Old 19th January 2009, 02:33 PM   #99
Salas is online now Salas  Greece
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See posts #3 & # 7 about what does what and how to set it.

It is OK to use one trafo and two regs. Better still, use one trafo with double secondaries and two rectifiers. Closer to double mono.

There can be many ways of running such tubes. Better read the brand's website or ask Allen Wright so to know exactly. A general third party guess without pointing us to the schematic, would be ''relatively low current, 10-20mA channel total''.
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Old 19th January 2009, 02:35 PM   #100
Salas is online now Salas  Greece
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Quote:
Originally posted by sesquialtera


Thanks for the great suggestions. I was able to scrunch the component placement to fit 2 on a board. Any issues with proximity of traces or thermal concerns (with the mosfets and the 5W resistors closer to each other?
Can you avoid double layer by routing the green traces differently?
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