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Old 21st February 2011, 08:29 PM   #2101
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Yes Jacco, that´s the one. Jan, i like that name "Feedbeside".
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Old 22nd February 2011, 05:49 AM   #2102
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Some time ago HiFi Daddy published a little circuit that i found fascinating. It is a balanced version of the famous Hiarga Le Pre-Pre with an added output transistor. immediately i had some ideas how i could improve it ( hopefully ). One thing is to add an RC filter after the transdiode. That should lower noise by 3dB. The other idea is to cascode the output transistor because in the original design it amplifies the positive terminal in common base and the negative terminal in common emitter. That should result in different bandwidth for the positive and negative side. See the original circuit and my redesign ( not dimensioned yet ).
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Old 22nd February 2011, 05:51 AM   #2103
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Errata : R7, R9 should be connected to minus 12V.
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Old 22nd February 2011, 08:26 AM   #2104
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Default Errata addendum

And Z1 reversed.
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Old 22nd February 2011, 09:00 AM   #2105
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Hi Joachim,
I did no calculations, but I think R1 should be 1k8 instead of 148R!

A nice circuit, and could be made it complementary as well.


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Old 22nd February 2011, 09:00 AM   #2106
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True, thanks.
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Old 22nd February 2011, 09:04 AM   #2107
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Yes, Rüdiger, this is an interesting circuit and got virtually no attention. Sorry that i posted my version in this rudimentary form. I said " not dimensioned yet " but it is good that AS and you take care that i do not post too much nonsense. I whould be interested how your version of it whould look.
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Old 22nd February 2011, 09:06 AM   #2108
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I am not sure about R1. I think we need 10mA in each input transistor at least.
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Old 22nd February 2011, 09:14 AM   #2109
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Hartmut sets 2.2k between -12V and 0V, that makes 5.4mA through each, and 11mA trough the first one, if its meant to be symmetrical. I might get distracted from the stuff I ought to do not before tonight ;-)

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Old 22nd February 2011, 09:27 AM   #2110
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Sure, take your time. I am very busy too. Have to restore an old pair of DUAL 190 speakers. Unbeleavable stuff they build in the 70th.
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