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Old 21st May 2007, 10:29 AM   #1
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Join Date: Jun 2004
Location: manila
Default without trimmer or bias.

hi guys,

i wonder if there's a high power amp say 200w/8R rms that has no trimmer bias. i mean... just put on all the parts and that's it!

i think i've seen one of it in the net but lost the detail as our co
change my pc, if i recall it was a quasi comp, uses TL071 on the input and also a high end amp.

i've tried to make marcus m250 but no luck, i also made some
LM3886 chip amp but my brother took it so... nothing left for me
now. though, im a newbie and learning electronic stuff by making actual projects becomes my hobby, also i can etch my own pcb.

hope some of you guys can help me here... thanks!

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Old 21st May 2007, 10:49 AM   #2
Did it Himself
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Join Date: Nov 2003
Location: Gloucestershire, England, UK
Why do you want such a thing? Setting bias is not hard. Just use a decent quality cermet trimmer.

The problem with poor bias control is that the sound will not be at it's best.
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, modules and more.
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Old 21st May 2007, 02:07 PM   #3
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A good trimmer is necessarry......
Or you can build an amp that uses Onsemi's Thermal Track output devices
Free Schematic and Service Manual downloads www.audio-circuit.dk, Spare time company (just for fun): www.dupont-audio.com
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Old 22nd May 2007, 02:59 AM   #4
Eva is offline Eva  Spain
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Plain class B does not need bias adjustment...
I use to feel like the small child in The Emperor's New Clothes tale
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