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β24: A discrete, cascoded, fully-differential power amplifier - Page 3

post #31 of 309
3/1/08 at 1:07pm
Thread Starter 
A sneak preview: 3D rendering of β24 PCB

For high-res version click here.



- One channel per board
- Board size 7" x 4.5"
- 4 copper layers
- Silkscreen on top side
- Soldermask on top and bottom sides
- Flexible off-board MOSFET heatsink schemes
- 8 onboard Panasonic TS-HA 1500uF 100V capacitor bank for output stage
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post #32 of 309
3/1/08 at 1:16pm
Welp, I'm salivating.

I just moved into a huge apartment in DC that's just BEGGING for a solid speaker setup!
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post #33 of 309
3/1/08 at 5:17pm
Quote:
Originally Posted by amb View Post
A sneak preview: 3D rendering of β24 PCB

For high-res version click here.

- One channel per board
- Board size 7" x 4.5"
- 4 copper layers
- Silkscreen on top side
- Soldermask on top and bottom sides
- Flexible off-board MOSFET heatsink schemes
- 8 onboard Panasonic TS-HA 1500uF 100V capacitor bank for output stage
Thanks for sharing !
Your excellent works are highly appreciated.
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post #34 of 309
3/1/08 at 7:38pm
Beautiful work, amb...expensive looking, too (to build)
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post #35 of 309
3/1/08 at 8:32pm
WOW nice work... Cant wait..
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post #36 of 309
3/1/08 at 9:05pm
Quote:
Originally Posted by dBel84 View Post
afraid not..... quoting AMB from headwize

"AMB, is there any problem with driving the B24 directly from the source( with source selector and atten) as a integrated amp?"

"masantos, As I said in the first post, the amp has low-ish input impedance and must be driven from a source with low output impedance. If you put a volume control directly before the input of this amp, the volume pot will become a high impedance source at anything except maximum volume. Typically, the volume control is before a flat-gain or buffer stage in the preamp in a speaker rig."

another superb project, thanks for sharing amb..dB
Ideally, the B22 preamping the B24?
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post #37 of 309
3/2/08 at 1:16am
amb, how did you create the 3D rendering?
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post #38 of 309
3/2/08 at 1:49am
Eagle3d and Povray I believe.
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post #39 of 309
3/2/08 at 2:07am
Thread Starter 
Quote:
Originally Posted by heatmizer
Eagle3d and Povray I believe.
Yup...
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post #40 of 309
3/4/08 at 9:42am
Thread Starter 


Silkscreen: light grey
Top layer: red (signals/ground plane)
Inner layer 1: grey (high current V+)
Inner layer 2: navy blue (high current V-)
Bottom layer: blue (signals/ground plane)

Overlap of top/bottom layers: violet
Overlap of inner layers: light blue
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post #41 of 309
3/4/08 at 10:12am
I see what you did there
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post #42 of 309
3/4/08 at 10:17am
Quote:
Originally Posted by d-cee View Post
I see what you did there
You're doing it wrong.


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post #43 of 309
3/4/08 at 11:02am
Really? 4 Layers? It's hard to tell with the real low res and compressed picture but surely you should be able to design it in only 2 layers, I'm yet to see any through hole board that couldn't be done in 2 layers and still be a good layout at the end
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post #44 of 309
3/4/08 at 11:02am
Quote:
Originally Posted by Crowbar View Post
You're doing it wrong.
Sorry



Anyway... back on topic!

Is that the production layout amb? or are more changes expected to be made?
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post #45 of 309
3/4/08 at 11:17am
Quote:
Originally Posted by d-cee View Post
Is that the production layout amb? or are more changes expected to be made?
It's the prototype layout, upon which initial testing will be done. I think we're a good ways from seeing the production pcb's, which is as it should be.
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