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Old 21st August 2003, 07:37 PM   #1
MikeW is offline MikeW  United States
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Default Mini A board

Any comments?
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Old 21st August 2003, 07:43 PM   #2
Arx is offline Arx  Canada
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Looks like a nice board, but why, other than looks, would you not use identical boards for both channels?
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Old 21st August 2003, 07:58 PM   #3
MikeW is offline MikeW  United States
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They are mirror images attached together so they can be built in pairs. Size is 5 x 4.5 inches. Picture is bigger than board. Just add gate and source resistors and MOSFETS. Three in a box for surround sound? May need x-overs for Bi amping?
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Old 21st August 2003, 09:31 PM   #4
RKH is offline RKH  United States
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Mike,
Nice work. Are they based on the original Mini-A schematic? Will you post a full size pdf of the trace side for those of us making our own pcb's. Just thought i'd ask. It's nice looking art work.

ryan
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Old 21st August 2003, 09:44 PM   #5
jleaman is offline jleaman  Belgium
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Great layout. i like it. Do you have any printed Board pictures..?
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Old 22nd August 2003, 01:08 AM   #6
MikeW is offline MikeW  United States
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Based on the mini A, but added Zeners and a cap for the input current source. I still need to check the layout. The boards have not been ordered yet, maybe in a couple of weeks.
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Old 22nd August 2003, 11:23 AM   #7
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Default Nice,

Quote:
Originally posted by MikeW
Based on the mini A, but added Zeners and a cap for the input current source. I still need to check the layout. The boards have not been ordered yet, maybe in a couple of weeks.
The boards I purchased from Kristijan use the protection zeners on the input also. Nice feature, hope it is never needed. I need to make a business trip to start stuffing the boards.
Is this one of your winter projects?
O/T Someone I know recommended using the Jensen 4 pole caps early this week for power supply filtering. I looked around to source some. What I found was a shock. 49.00 each. There is a nice 10,000 ufd 40v that would be perfect for a Mini A. Looks good on paper.


George
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Old 22nd August 2003, 01:37 PM   #8
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Mike:
For me is too long distance between input ground and output ground. Small signal ground will flow through whole size of pcb and may interact with elements of the circuit.
Best Regards
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Old 22nd August 2003, 04:39 PM   #9
MikeW is offline MikeW  United States
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The whole top of the board is gound plane except for one trace. Another ground connection will be added for power.
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Old 24th September 2003, 04:52 PM   #10
MikeW is offline MikeW  United States
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