A real Vendetta? - Page 2

analog_sa · 24th November 2006, 11:01 AM

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.

john curl · 25th November 2006, 12:36 AM

More like 400 ohms.

analog_sa · 25th November 2006, 07:05 AM

A bit less errors this time. Thanks to Peter Daniel for spotting a problem in the servo.

janneman · 27th November 2006, 06:53 PM

Quote:

Originally posted by analog_sa
SCM-2 with corrections

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

MRupp · 27th November 2006, 09:20 PM

Quote:

And Q17 says J203 but shows an n-channel jfet, in which case it would most likely be a Kxxx ...

Actually, I now found J201 - J204 N-Channel JFets (not 2SJ..), amongst others from Vishay, which are supposedly "very low noise", I presume they are the ones being used.

Alain Dupont · 27th November 2006, 09:42 PM

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.

jacco vermeulen · 27th November 2006, 09:44 PM

Quote:

I now found J201 - J204 N-Channel JFets

remember this ?

Maybe Mr Curl was a little less Japanese spenderish mood on the Vendetta circuitry ?

MRupp · 27th November 2006, 10:07 PM

Hmmmm, I'm getting old - now that you show the link

john curl · 28th November 2006, 12:08 AM

An old saying: "There are many ways to skin a cat."

jacco vermeulen · 28th November 2006, 09:30 AM

Mr Curl,

I had the impression some of the folks overhere see you as the audio "cat" to "skin" !

25th November 2006, 12:36 AM	#12
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	More like 400 ohms. __________________ "Condemnation without Examination is Prejudice"

27th November 2006, 10:07 PM	#18
MRupp diyAudio Member Join Date: Dec 2003 Location: Frankfurt area	remember this Hmmmm, I'm getting old - now that you show the link __________________ Martin Rupp

28th November 2006, 12:08 AM	#19
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	An old saying: "There are many ways to skin a cat." __________________ "Condemnation without Examination is Prejudice"

28th November 2006, 09:30 AM	#20
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Mr Curl, I had the impression some of the folks overhere see you as the audio "cat" to "skin" ! __________________ If you are arguing with an idiot, first make sure that he is not doing the same thing. (©Dr Bora J.)

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24th November 2006, 11:01 AM	#11
analog_sa diyAudio Member Join Date: Aug 2002 Location: South Africa	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.

27th November 2006, 09:42 PM	#16
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	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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