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GB Pass M2 Clone Boards with 120mm UMS spacing by Tea-Bag
GB Pass M2 Clone Boards with 120mm UMS spacing by Tea-Bag
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Old 9th May 2018, 09:33 PM   #341
Skylar88 is offline Skylar88  South Africa
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Am I the only one thinking about using replaceable daughter boards, M2x-style?

With Toshiba Jfets being largely unobtanium, it means we can use input stages with different, more readily available components. Shouldn't be difficult to adapt the concept to Tea-bag's boards. Just add female headers and plug in a board.
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Old 10th May 2018, 12:14 AM   #342
Mark Johnson is offline Mark Johnson  United States
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GB Pass M2 Clone Boards with 120mm UMS spacing by Tea-Bag
You'd want to avoid the Osborne effect, or else the sales pipeline could be full of last generation PCBs, whereas customers only want the next generation PCBs. Somebody will have to eat the cost of all of that unwanted inventory. Somebody (else?) will have to cough up the NRE cost of developing the new PCB, then prototyping and testing it.
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Old 10th May 2018, 06:05 AM   #343
Skylar88 is offline Skylar88  South Africa
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I was thinking DIY daughter boards to fit Tea-bag's boards, Mark. To me that means "home made" and maybe even p2p construction since some are so simple with low parts count.

Can't see how that should influence any production boards of Tea-bag's or yours (M2x).

The diyAudio forum is full of suggestions for improvements. Why would my idea be any different? Unless you feel that your M2x daughter board circuits shouldn't be copied for private use.
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Old 10th May 2018, 11:39 AM   #344
Mark Johnson is offline Mark Johnson  United States
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GB Pass M2 Clone Boards with 120mm UMS spacing by Tea-Bag
Ah, I misunderstood; I thought you proposed to re-layout the M2clone and make it a motherboard. Do whatever you like, with applause (but not technical support) from me. There is an ancient and noble tradition of "air wired" modifications to audio equipment going back at least to the 1950s, if not earlier. Today most of it is a PCB full of SMD discretes that plugs into a dual opamp socket, or an LM7815 voltage regulator footprint.
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Old 10th May 2018, 11:59 AM   #345
Skylar88 is offline Skylar88  South Africa
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Quote:
Originally Posted by Mark Johnson View Post
Ah, I misunderstood; I thought you proposed to re-layout the M2clone and make it a motherboard. Do whatever you like, with applause (but not technical support) from me.

I suspected as much.

But, it's reassuring to have your blessing to use your ideas and circuits, Mark. You're doing exceptional work and I respect you for that. Fact is, you announced the M2x barely an hour after I pulled the trigger on buying Tea-bag's boards. Had I waited a bit, I would most probably have ordered M2x boards!
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Old 10th May 2018, 12:19 PM   #346
dewdrop is offline dewdrop  Singapore
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Question: what is the heatsinks required for the M2? Will a diyAudio 3U chassis work?
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Old 10th May 2018, 12:23 PM   #347
6L6 is offline 6L6  United States
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GB Pass M2 Clone Boards with 120mm UMS spacing by Tea-Bag
A 3U 300mm is just on the edge of being too small. 3U 400 would be fine. 4U 300 is considered normal.

The difference with making it successful is having sufficient ventilation above and below the heatsinks. Elevate the amp 30mm+ up from the surface it's set on and have 100mm+ of space above the heatsinks and the natural convection will happen unhindered.
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Old 10th May 2018, 02:27 PM   #348
dewdrop is offline dewdrop  Singapore
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Originally Posted by 6L6 View Post
A 3U 300mm is just on the edge of being too small. 3U 400 would be fine. 4U 300 is considered normal.

The difference with making it successful is having sufficient ventilation above and below the heatsinks. Elevate the amp 30mm+ up from the surface it's set on and have 100mm+ of space above the heatsinks and the natural convection will happen unhindered.
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Old 12th May 2018, 11:27 PM   #349
BeardyWan is online now BeardyWan
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follow up heatsink question...

mini dissipante 200mm 2U is sufficient for 34W from 24V ACA 1.6.
So 300mm 2U should be OK for 50% more (~50W)

M2 with 0.56 ohm source resistors and 19.5V rails will pull 1.1A and mosfets will generate 41W per channel. so this should be OK...
Will the boards fit a 2U chassis?
Am I missing anything here?
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