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Old 8th November 2004, 10:35 AM   #1
locky_z is offline locky_z  China
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Default Current differen power amp

(My english is BAD.)

From LM359(Norton OP AMP) PDF,I design this power AMP.
1.It use all NPN type tranistror.
2.The THD is low and even harmonious much more than odd harmonious. At Vout=4Vrms( 8ohm 1Khz) THD=0.1% and even harmonious(2KHz) is -43dB,odd harmonious(3KHz) is -67dB.
3.I think it is a CFB amp.
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Old 28th October 2008, 03:07 PM   #2
lineup is offline lineup  Sweden
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Thumbs up Norton - another All NPN amplifier

locky_z
Good circuit
Norton is interesting.
We can get VERY FAST amplifiers like this.

I attach the LM359 circuit diagram.
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Old 28th October 2008, 03:08 PM   #3
lineup is offline lineup  Sweden
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To overcome Lower Input impedance of Norton
we can use JFET Differential Input stage.
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