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Old 13th February 2012, 09:52 AM   #1941
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black step driver of m10 / k10 is base on h900 of apex
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Old 13th February 2012, 02:17 PM   #1942
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Default H900 with discrete step driver step

...
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File Type: pdf H900x1IRF2807all.pdf (58.5 KB, 785 views)
File Type: pdf H900x1IRF2807bottom.pdf (30.0 KB, 631 views)
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Old 13th February 2012, 04:21 PM   #1943
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Default Vertex

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Originally Posted by irvynejay View Post
black step driver of m10 / k10 is base on h900 of apex
Hey Irvynejay,does your vertex working good??
I saw you have wrong direction on tr bc series on diff stage....


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Old 13th February 2012, 10:33 PM   #1944
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OT<
vertex are fine until now still waiting to be pack hehehe
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Old 13th February 2012, 11:34 PM   #1945
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OT<
vertex are fine until now still waiting to be pack hehehe
Ow...good job...
But I mean the first pcb you upload that use orange elco...
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Old 13th February 2012, 11:43 PM   #1946
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ah ok i was using different king of transistor at that time that's why it is on opposite direction
2n3906 /04
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Old 15th February 2012, 12:35 AM   #1947
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Sir apex, it is ok to replace optoresistor NSL32 with optotransistor? If ok , please show me the schematic.
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Old 17th February 2012, 01:40 PM   #1948
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Hi all DIYers!

I have the B500 built, it's just about to test. I also plan to build the H900.
A few question about this two amps:
-I have some VTL5C1 lying around, can it be used in the limiter with 47k parallel on resistor side?
-I also have a bunch of MJW21195-MJW21196 pairs, would be they ok instead of 5200-1943?

And one more thing, I want to use the H900 for bass guitar on 4 ohm load. It would be safe enough on low frequencies?

Thanks for any advice, keep up the nice work!
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Old 17th February 2012, 04:15 PM   #1949
effebi is offline effebi  Italy
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Originally Posted by mackomester View Post
Hi all DIYers!

-I also have a bunch of MJW21195-MJW21196 pairs, would be they ok instead of 5200-1943?
I belive your Motorolas (ONSEMI) are much BETTER than the 5200/1943 , especially in a PA / Heavy Duty application.
Have a look on SOA curves....
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Old 17th February 2012, 04:58 PM   #1950
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Thats good to hear, I didn't actually check the datasheet.
I have 14 pairs of MJW's, my goal is 1500W on 4 ohms.
Would be that possible with one channel of H900? Or easier
with a bridged B500? I don't want to bridge if not necessary...
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