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Help me with Common Collector Configuration for current gain

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ntung

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I tried to design a common collector using 2n3904 to get a current gain for at least 125mA to drive a speaker.

I tried but my output waveform is not what i expected to get.(it looks like its rectificed)
Anybody can help me? :cry:
 

Re: Help me with Common Collector Configuration for current

Your problem is that pullup is through the transistor and pulldown is through R3. You need to use a complementary emitter follower type stage with a PNP transistor for pulldown.
 

Re: Help me with Common Collector Configuration for current

Use push pull type cofiguration. It will help you.
 

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