Honestly, the CFP output stage is not really a good one for beginners to experiment with. They are easily provoked into oscillation, and PCB layout becomes extra important.
Christian's original layout shown here has several flaws (thin power/ground traces, bad routing of the feedback path, no high frequency power decoupling) that will not have been helping. These do affect EF stage amplifiers, but they affect CFP stages far more.
Christian's original layout shown here has several flaws (thin power/ground traces, bad routing of the feedback path, no high frequency power decoupling) that will not have been helping. These do affect EF stage amplifiers, but they affect CFP stages far more.
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