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Old 24th August 2011, 08:41 AM   #11
jule is offline jule  Slovenia
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For class A operation on 250V they recommend 43mA, for AB 34mA. So I only lower the current and I am in other operation?


But how do I find the power output? What will I have to measure to approximate?
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Old 24th August 2011, 01:37 PM   #12
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current x HT voltage will give you a rough guideline.
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Old 24th August 2011, 01:39 PM   #13
TheGimp is offline TheGimp  United States
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Measure the RMS output voltage just before clipping. Then P=E*E/R where E is rms voltage, R is your load impedance and P is power.

RMS = Peak to Peak /2.83
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Old 24th August 2011, 01:45 PM   #14
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isnt RMS = peak to peak/root2
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Old 24th August 2011, 03:30 PM   #15
TheGimp is offline TheGimp  United States
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Peak = p-p/2
RMS = Peak/root2*





* only for sine waves
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Old 24th August 2011, 04:40 PM   #16
jule is offline jule  Slovenia
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If I use sine wave generator as input signal, then I use root^2. Tomorrow I will probably build the amp and try it out.
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