My LM3886 Board Based On BR100 Schematic

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CJ900RR

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Joined 2006
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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CJ900RR

Member
Joined 2006
gcds said:


Yes i will put on pins directly wima caps :)

What you mean very low input impedance?
Click to expand...


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/index?qid=20080711082801AAlSaU0
http://wiki.answers.com/Q/Why_do_amplifiers_have_a_high_input_impedance
 
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