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#11 |
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diyAudio Member
Join Date: Aug 2002
Location: Sofia
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Hi Martin
R15 is of course 100k, thanks for spotting it. I cut and pasted the regs from the input board and never bothered to check the values. R41 is difficult to read from the photos as it's not colour coded. I also agree that 2k seems too high to supply the expected 3.5mA but its value will have to be tweaked anyway once you choose a FET. Unfortunately i'm getting ready for an overseas trip as i would really like to simulate the circuit. Any idea if models for these or similar fets are available? The j203 designation comes courtesy of Mr Paoletti. It obviously has to be an n-channel. |
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#12 |
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diyAudio Member
Join Date: Jul 2003
Location: berkeley ca
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More like 400 ohms.
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#13 |
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diyAudio Member
Join Date: Aug 2002
Location: Sofia
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A bit less errors this time. Thanks to Peter Daniel for spotting a problem in the servo.
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#14 | |
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diyAudio Member
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Quote:
I think D3,4 should be in parallel rather than in series. Also, in the first diagram posted, there is a 100nF cap in parallel to 750 ohms at the output. Wonder if that 100nF is correct? Edit: I see now that they (D3,4) have been changed to zeners, that's ok in series of course. Jan Didden
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/New Linear Audio publication: Baxandall & Self on Audio Power! |
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#15 | |
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diyAudio Member
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Quote:
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Martin Rupp |
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#16 |
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diyAudio Member
Join Date: Sep 2003
Location: Paris - France
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analog_sa,
About the IC AD 711 power supply, could a 100 or 470 uF / 50 volts accross the 2 zeners D1 D2 remove their noise ? Alain. |
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#18 |
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diyAudio Member
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Hmmmm, I'm getting old - now that you show the link
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Martin Rupp |
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#19 |
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diyAudio Member
Join Date: Jul 2003
Location: berkeley ca
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An old saying: "There are many ways to skin a cat."
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#20 |
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diyAudio Member
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Mr Curl,
I had the impression some of the folks overhere see you as the audio "cat" to "skin" !
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