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Old 10th March 2005, 11:20 PM   #101
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by BrianGT


There will be 2 pcb sets,
- amplifier pcb set: 2 amplifier boards and 4 output boards
- power supply set: 1 power supply board and 1 soft start board

I am revising the amplfier board set currently, and will post a new picture when I finish. I should be ready to order prototype pcbs next week for this. As for the power supply pcb set, I am working to put together a circuit for prototyping the soft start / momentary switch pcb. If people are constrained on time, I could remove the momentary switch board (based on this design: http://maxhawk.bravepages.com/projec...non/index.html ) and only make the soft start board be a board with an AC recepticle, AC fuse and thermistors for handling inrush current.

My goal is to make each pcb set around $20 each (depends on interest and production cost), and make them with a blue soldermask and 3 to 4oz copper for extra current handling on the traces.

There are no dates currently set for this project, but it is not on the back burner and is my primary focus when it comes to new projects.

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Brian
i'm Wondering do we really need this inrush current thing ?
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Old 11th March 2005, 02:10 AM   #102
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You won't need it if you fancy resetting your circuit breaker every time you turn your amplifier on.
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Old 11th March 2005, 02:24 AM   #103
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by kilowattski
You won't need it if you fancy resetting your circuit breaker every time you turn your amplifier on.

I bet i will have to do this when my aleph 2's are done. 2 x 1kva toroidal with 300thousand mf's per rail so that 4 x : O ) yeah il be ressting the breaker : O )
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Old 11th March 2005, 05:20 AM   #104
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by jleaman

i'm Wondering do we really need this inrush current thing ?
I can easily make the inrush current board with the a pcb mount AC recepticle, AC fuse and the thermistors (labelling for selection 120/240 wiring with the transformer).

The issue at hand is currently the creation of a board that would allow for the use of a momentary switch with a relay and flipflops for turning off an on the amp. If this is not needed, then the boards are almost ready to be ordered for prototypes.

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Brian
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Old 11th March 2005, 05:23 AM   #105
steenoe is offline steenoe  Denmark
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Quote:
There are no dates currently set for this project
No need to hurry. Better is it, to have a complete and perfected project. Great ideas has come up so far and I would like to see them all implemented.

Steen.
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Old 11th March 2005, 06:15 AM   #106
BrianGT is offline BrianGT  United States
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Here is the revised amp board:
Click the image to open in full size.

I placed the old version here:
http://chipamp.com/diyaudio/miniA-with_output-old.gif

Changes:
- added extra holes on output boards for paralleling the device boards
- thickened the high current traces

Let me know if you have any comments,

--
Brian
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Old 11th March 2005, 06:28 AM   #107
steenoe is offline steenoe  Denmark
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Brian, are the board still 2,9"x2"? Or better still could you post the dimensions of each board, main and output? (inch or mm)
Thanks

Steen.
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Old 11th March 2005, 11:02 AM   #108
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by steenoe
Brian, are the board still 2,9"x2"? Or better still could you post the dimensions of each board, main and output? (inch or mm)
Thanks

Steen.
You should be able to see them from the above drawing, but here they are separately:

amp board: 2.2"x3.5"
output board: 1" x 3.5"

power supply board currently is 3.4" x 6.4"

--
Brian
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Old 11th March 2005, 02:52 PM   #109
troystg is offline troystg  United States
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Quote:
Originally posted by BrianGT

There are no dates currently set for this project, but it is not on the back burner and is my primary focus when it comes to new projects.
Brian

Hey Brian-

No hurry, I just plan out my projects so I can forecast funding and time needs.

I try not to have more than 3 projects going at once so at least ONE has a chance to be completed.

I think your current plan for an "all inclusive" pwr supply PCB is best.

And thanks in advance, I know it will be as good a PCB as your LM3875/86. Of which I own both and enjoy.

Troy
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Old 11th March 2005, 03:04 PM   #110
steenoe is offline steenoe  Denmark
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Quote:
You should be able to see them from the above drawing
I had gone blind on those mil digits Now I see them.
Thanks. It all looks really good so far

Steen.
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