Mini A board

MikeW · 21st August 2003, 06:37 PM

Any comments?

Arx · 21st August 2003, 06:43 PM

Looks like a nice board, but why, other than looks, would you not use identical boards for both channels?

MikeW · 21st August 2003, 06:58 PM

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?

RKH · 21st August 2003, 08:31 PM

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

jleaman · 21st August 2003, 08:44 PM

Great layout. i like it. Do you have any printed Board pictures..?

MikeW · 22nd August 2003, 12:08 AM

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.

Panelhead · 22nd August 2003, 10:23 AM

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

jarek · 22nd August 2003, 12:37 PM

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

MikeW · 22nd August 2003, 03:39 PM

The whole top of the board is gound plane except for one trace. Another ground connection will be added for power.

MikeW · 24th September 2003, 03:52 PM

Top

21st August 2003, 06:58 PM	#3
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	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? __________________ MikeW

22nd August 2003, 12:08 AM	#6
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	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. __________________ MikeW

22nd August 2003, 12:37 PM	#8
jarek diyAudio Member Join Date: Dec 2002 Location: Poland	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 __________________ Jarek

22nd August 2003, 03:39 PM	#9
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	The whole top of the board is gound plane except for one trace. Another ground connection will be added for power. __________________ MikeW

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21st August 2003, 06:43 PM	#2
Arx diyAudio Member Join Date: Aug 2003 Location: North Vancouver, B.C.	Looks like a nice board, but why, other than looks, would you not use identical boards for both channels?

21st August 2003, 08:31 PM	#4
RKH diyAudio Member Join Date: Sep 2002 Location: Colorado, USA	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

21st August 2003, 08:44 PM	#5
jleaman Banned Join Date: Apr 2002	Great layout. i like it. Do you have any printed Board pictures..?

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