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Old 13th September 2010, 05:57 AM   #511
savu is offline savu  Romania
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hope they come fast.... i am very curious ...

attached is almost complete pcb design made with only smd parts.

regards,
savu
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File Type: png tekko.png (177.9 KB, 1905 views)
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Old 18th September 2010, 11:55 PM   #512
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Quote:
Originally Posted by savu View Post
hope they come fast.... i am very curious ...

attached is almost complete pcb design made with only smd parts.

regards,
savu
Very compact PCB design! Very curious to know its performance.

Cheers
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Old 20th September 2010, 06:15 PM   #513
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Quote:
Originally Posted by savu View Post
hope they come fast.... i am very curious ...

attached is almost complete pcb design made with only smd parts.

regards,
savu

can you post the files (also for the schematic with values - that way it can't be mixed with other versions of this amplifier)?
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Old 21st September 2010, 12:49 AM   #514
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I was thinking about etching one of these. I have a bunch of PCB material I've had around for a while and want to do something with them.

I'm guessing it can't do 1200 watts with just 2 output devices? What kind of power do you guys expect/get with this smaller board?

The SMT board looks very nice indeed I just need to pick a design and get to etching it lol.
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Old 21st September 2010, 12:49 PM   #515
savu is offline savu  Romania
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Hello Gents,

as i speciffied the pcb is partialy finished. it misses the supply filter caps, the imput resistors and caps, the feedback loop, and the output LC filter.

when it's done i will post complete pcb design with part values.

regards,
savu
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Old 22nd September 2010, 01:06 AM   #516
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Default A bit faster level shifter

Quote:
Originally Posted by Tekko View Post
Heres a simulation of what im gonna try when the MAX913's arrives.
Click the image to open in full size.
Hello Tekko,

If you add a 10pF cap parallel to R3 or R15, you will get a bit faster level shift.

Cheers,

Here is the sim,

Click the image to open in full size.

Last edited by gogowatch; 22nd September 2010 at 01:18 AM. Reason: Add attachment
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Old 22nd September 2010, 01:09 AM   #517
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Quote:
Originally Posted by savu View Post
Hello Gents,

as i speciffied the pcb is partialy finished. it misses the supply filter caps, the imput resistors and caps, the feedback loop, and the output LC filter.

when it's done i will post complete pcb design with part values.

regards,
savu
I think I may try your board once it's finished.
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Old 29th September 2010, 05:41 PM   #518
lycanlk is offline lycanlk  Sri Lanka
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Default I've got a problem with Ejtagle UCD when driving 12 inch woofer..

I've got a chance to drive 12 inch JBL speaker GT01214 with my UCD.. I used the following lowpass filter but the amp could not drive the speaker after a certain level that It produces clipping noise for drum foot.. I wish thats before clipping level. but when I use this filter with a class AB amp (DX standard by Carlos), the woofer drives well without any clipping noise.. also can volume more than my UCD to drive the woofer well enough and have a good output power (good bass). My questions is that its because of class AB clipping noise is not audible ?? or if not whats wrong with my UCD over others ?? I dont have a scope to measure but theres a huge difference between those 2 amps.. used the same supply for both +/- 50v. that is true I increase the gain of the low pass filter to fit my input source... and I can assure that its not the issue because of both the amps give almost equal output at same level of input.. some professional advice is needed.

Thanks in advance and best regards,
Lycanlk
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Old 8th October 2010, 09:54 AM   #519
stewin is offline stewin  Kenya
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hi guys if mosfets are paralled together like the below scheme but using irfp 250 with ucd 25 - 1200 scheme can it increase power instead of using irf 4227 cause of the availability issues.
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Old 8th October 2010, 10:18 AM   #520
Eva is offline Eva  Spain
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Quote:
Originally Posted by gogowatch View Post
Hello Tekko,

If you add a 10pF cap parallel to R3 or R15, you will get a bit faster level shift.

Cheers,

Here is the sim,

Click the image to open in full size.
And two more capacitors are added directly from comparator outputs to HIN and LIN gate driver inputs, it's even faster. The optimum capacitance value may be lower than 10pf. But this requires clean supply rails, any substantial Mhz ripple on the negative rail WRT ground will make it unreliable, and your PCB layouts are likely to produce plenty of that.
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Last edited by Eva; 8th October 2010 at 10:20 AM.
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