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Old 5th October 2007, 03:37 PM   #1
nikwal is offline nikwal  Sweden
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Join Date: Aug 2005
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..
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.. Yeah, amps can be made tight..

and here's my "büllshitting" page..
With pics of the big square box containing four vicors and stuff..
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Old 6th October 2007, 09:14 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, 05:25 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 old 800watt toroid+ 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, 01:02 AM   #4
eyoung is offline eyoung  United States
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Location: Sunny SC,USA 15 min south of Charlotte NC
no input coupling cap??
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Old 7th October 2007, 01:28 PM   #5
nikwal is offline nikwal  Sweden
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Join Date: Aug 2005
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, 01:34 PM   #6
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
I don't like the Vgs multiplier pot arrangement.
DC coupled input and AC coupled NFB = output offset drift and maybe worse.
regards Andrew T.
Sent from my desktop computer using a keyboard
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