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Old 5th October 2007, 04:37 PM   #1
nikwal is offline nikwal  Sweden
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Default This is how my new amp is turning out..

Hello , I know you're a fastidious crowd,hmm hard to please , but I thought i'd just share my new box and prototype design with thoose of you that hav'nt already seen it..
http://dsl.mine.nu/galleri/misc/amp2/
Is'nt the prototype nice looking ? ;-) just kidding as you see I've got a board to make too..

and a few pics from inside my old amp if you'd like to see that..
http://dsl.mine.nu/galleri/misc/miniamp/ Yeah, amps can be made tight..

and here's my "büllshitting" page..
http://amp.webhop.biz
With pics of the big square box containing four vicors and stuff..
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Old 6th October 2007, 10:14 AM   #2
Gordy is offline Gordy  United Kingdom
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It is good to see that you have separate regulation / supplies for the input stages on your amp. I think many people could improve their amps by following this simple idea.
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Old 6th October 2007, 06:25 PM   #3
nikwal is offline nikwal  Sweden
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Hmm actually I'm connecting two small dcdc conveters in series with the big power modules but yeah the diode-resistor-capacitor works ok for isolating the power from the output stage.. But in my case I dont think it actually matters at all because I'm feeding the cards separatley with 2+2 vicor modules with current feedback (4.thread) so it wont really change at all (or very very little).. hmm anyone know a cheapish place to buy them damn modules? exept ebay? i'm running low...my old 800watt toroid+ cap.bank could be for sale I guess, I dont see myself using that again hehehe.. hmm or i might donate it to a friend..
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Old 7th October 2007, 02:02 AM   #4
eyoung is offline eyoung  United States
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no input coupling cap??
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Old 7th October 2007, 02:28 PM   #5
nikwal is offline nikwal  Sweden
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Quote:
Originally posted by eyoung
no input coupling cap??
Not if I can make the rules.. yeah I know there is usually supposed to be one but dc offset is "nulled" (un-amplified) in the capacitor in the feedback.. hmm
Damn I tried fooling my friend into making the pcb's but he didnt fall for it, so now I have to make them myself grrr,, I getting lazy nowadays
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Old 7th October 2007, 02:34 PM   #6
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
Hi,
I don't like the Vgs multiplier pot arrangement.
DC coupled input and AC coupled NFB = output offset drift and maybe worse.
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regards Andrew T.
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