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Old 8th January 2009, 06:25 PM   #1
gcds is offline gcds  Lithuania
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Join Date: Mar 2007
Post My LM3886 Board Based On BR100 Schematic

Yesterday Designed LM3886 Board by BR100 Schematic. But dont know it is good design ;D Because i wanna order good quality pcb. It my first amplifier pcb
It Will be Bridged

http://fenas.lt/Archive22.zip
http://fenas.lt/4806_bottom_lg.png
http://fenas.lt/4806_top_lg.png
http://fenas.lt/top.png
http://fenas.lt/bottom.png

Best Regards
gcds
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Old 8th January 2009, 07:31 PM   #2
CJ900RR is offline CJ900RR  Sweden
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Looks good except that there is no decoupling-caps at V+ or V-, but im guessing that you will put them directly on pin?

One remark though: when using LM3886 in inverted mode you will have very low input impedance. Its not sure that all sources can handle that...
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Old 8th January 2009, 07:49 PM   #3
gcds is offline gcds  Lithuania
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Quote:
Originally posted by CJ900RR
[B]Looks good except that there is no decoupling-caps at V+ or V-, but im guessing that you will put them directly on pin?
Yes i will put on pins directly wima caps
Quote:
One remark though: when using LM3886 in inverted mode you will have very low input impedance. Its not sure that all sources can handle that...
What you mean very low input impedance?
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Old 8th January 2009, 09:08 PM   #4
CJ900RR is offline CJ900RR  Sweden
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Quote:
Originally posted by gcds


Yes i will put on pins directly wima caps

What you mean very low input impedance?

Good with the caps

A CD-player or a preamp or similar generally have a low output impedance (mostly 100R to 300R), and the amplifier have a high(er) input impedance (mostly 22K to 100K).

Simplified this is to prevent the amplifier to draw energy from the source, since the source is not made to amplify that signal. That's the amplifiers job. There is other things to but I need to sleep so I just drop you some links

http://en.wikipedia.org/wiki/Input_impedance
http://in.answers.yahoo.com/question...1082801AAlSaU0
http://wiki.answers.com/Q/Why_do_amp...nput_impedance
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