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Old 4th November 2013, 07:55 PM   #161
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I am a little bit exhausted from the Krefeld show and will leave for Vienna soon.
I try to find a slot tomorrow.
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Old 5th November 2013, 08:58 AM   #162
RCruz is offline RCruz  Switzerland
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Please do not bother... it is not urgent.... I will keep developing the layout and will post a better one soon.

How was the show ?
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Old 5th November 2013, 10:17 AM   #163
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OK, thanks.
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Old 5th November 2013, 10:19 AM   #164
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Here is the pin out of the BC327/337 :
http://www.fairchildsemi.com/ds/BC/BC337.pdf
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Old 8th November 2013, 08:32 PM   #165
RCruz is offline RCruz  Switzerland
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Et voila

Here you have my latest layout.... Please disregard the previous ones that might have errors in the output stage connections.

I would just appreciate your comments on the placement of the parts and particularly on the GND layout and smoothing caps.

I will off course study the pinouts carefully before implementation.

Does this design ever work in class AB ?
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Old 13th November 2013, 06:04 AM   #166
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I just came back from the Vienna Show. A 12 hour car ride by night.
At first glance i would do the PSU and ground traces quite a bit thicker.
Well, where does Class B stop and Class AB start ?
The only " hard " Class B HiFi Amp i know is the current dumper in the Quad 405 ( and siblings ). There is absolute no bias i think. Even the small bias i use in the Szikley output stage of the Nobrainer amp i consider as Class AB. Curiously when you read Self a Szikley has minimum distortion at very low bias. He shows that graphically as the waveform in transit from the NPP to PNP output transistor. When you " over bias " a Szikley, the distortion goes up. Unfortunately he does not show an FFT spectrum so it well can be that mostly second rises when you go from say 15mA to 125mA of my prototype. That can sound " warmer " or " better " although THD as such goes up.
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Old 17th November 2013, 03:52 PM   #167
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This one can be used if more power is required :
http://www.ti.com/lit/ds/sbos100a/sbos100a.pdf
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Old 17th November 2013, 08:18 PM   #168
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Thank you
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Old 18th November 2013, 06:06 PM   #169
RCruz is offline RCruz  Switzerland
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Using a +-35V psu, how much power can this circuit deliver into a 4ohm load ?
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Old 18th November 2013, 06:11 PM   #170
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Quote:
Originally Posted by RCruz View Post
Using a +-35V psu, how much power can this circuit deliver into a 4ohm load ?
I * I * R
V * V / R
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