Simplistic NJFET RIAA - Page 315

massimo · 11:41 PM

Not that important, but...
Take a DVM, set for max VAC, probes (forget colour) on pin 2 and 3 of the Xfrm: you get something around 225-235 VAC. That is Vin
BE CAREFUL! High Voltage! Don't short anything!

Then set the DVM for 200 VAC, probes on pin 6 and 7 and you get the Vout

Assuming you've wired the Xfrm as per the drawing you attached.

P.S. the Preamp should be on

P.P.S. you have now two shunt regs connected to one Xfrm, right? Thus total I should be around 2 * 200 mA or so....

merlin el mago · 12th March 2010, 11:39 AM

If I understand well, you want to know the secondary voltage with the phono connected, ok?

Salas · 12th March 2010, 11:41 AM

He wants to see the regulation. How much it drops from nominal when well loaded. Now you must have one Tx giving about 300mA to a pair of regs, right? Thats a tell tale situation enough.

merlin el mago · 12th March 2010, 11:56 AM

Why want to know how drops from nominal when loaded, possible to know the perfomance of the Tx, if its capable to follow giving the 40V when loaded?

Salas · 12th March 2010, 11:59 AM

Yes, and maybe he wants to know where it goes when the secondaries go series like its needed here. You know Italians, always never worried about top performance in gear and chicks. Ducati, Ferrari, Monica Bellucci etc.

Always about compromising are those guys...

nicoch58 · 12th March 2010, 12:10 PM

Salas · 12th March 2010, 12:17 PM

Don't grin up on me you sneaky you! Not to mention you know zero fashion or the cheap indifferent quality of food and wine, pasta and dairies you propose to the world...

merlin el mago · 12th March 2010, 12:31 PM

Seems the only way to get the perfection nothing to do with compromising.

I love Ferrari+Alonso, any kind of pasta, pizza, italian coffe (please no other like the expresso), capuccino, Monica Belluci too. I visit Italy several times & I enjoyed other fine things like carpaccio, grana padano, funghi porcini & many other delicatessen, don't forget fashion are the best. The bad thing is traffic when goes more to the south more bad, Milan seems perfect when you drive in Rome, butwhen you drive in Napols or Reggio Calabria you live in other dimension.

massimo · 12th March 2010, 12:34 PM

Quote:

Originally Posted by Salas

He wants to see the regulation.

The only data not specified by Hammond

massimo · 12th March 2010, 12:37 PM

Quote:

Originally Posted by Salas

Yes, and maybe he wants to know where it goes when the secondaries go series like its needed here. You know Italians, always never worried about top performance in gear and chicks. Ducati, Ferrari, Monica Bellucci etc.

Always about compromising are those guys...

I'm an open book for you! (as we say in Italy)

11th March 2010, 11:38 PM	#3141
massimo diyAudio Member Join Date: Dec 2002 Location: Milan, Italy	Not that important, but... Take a DVM, set for max VAC, probes (forget colour) on pin 2 and 3 of the Xfrm: you get something around 225-235 VAC. That is Vin BE CAREFUL! High Voltage! Don't short anything! Then set the DVM for 200 VAC, probes on pin 6 and 7 and you get the Vout Assuming you've wired the Xfrm as per the drawing you attached. P.S. the Preamp should be on P.P.S. you have now two shunt regs connected to one Xfrm, right? Thus total I should be around 2 * 200 mA or so.... Last edited by massimo; 11th March 2010 at 11:41 PM.

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12th March 2010, 11:39 AM	#3142
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	If I understand well, you want to know the secondary voltage with the phono connected, ok?

12th March 2010, 11:41 AM	#3143
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	He wants to see the regulation. How much it drops from nominal when well loaded. Now you must have one Tx giving about 300mA to a pair of regs, right? Thats a tell tale situation enough.

12th March 2010, 11:56 AM	#3144
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	Why want to know how drops from nominal when loaded, possible to know the perfomance of the Tx, if its capable to follow giving the 40V when loaded?

12th March 2010, 11:59 AM	#3145
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Yes, and maybe he wants to know where it goes when the secondaries go series like its needed here. You know Italians, always never worried about top performance in gear and chicks. Ducati, Ferrari, Monica Bellucci etc. Always about compromising are those guys...

12th March 2010, 12:10 PM	#3146
nicoch58 diyAudio Member Join Date: Oct 2004

12th March 2010, 12:17 PM	#3147
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Don't grin up on me you sneaky you! Not to mention you know zero fashion or the cheap indifferent quality of food and wine, pasta and dairies you propose to the world...

12th March 2010, 12:31 PM	#3148
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Blanes - Costa Brava	Seems the only way to get the perfection nothing to do with compromising. I love Ferrari+Alonso, any kind of pasta, pizza, italian coffe (please no other like the expresso), capuccino, Monica Belluci too. I visit Italy several times & I enjoyed other fine things like carpaccio, grana padano, funghi porcini & many other delicatessen, don't forget fashion are the best. The bad thing is traffic when goes more to the south more bad, Milan seems perfect when you drive in Rome, butwhen you drive in Napols or Reggio Calabria you live in other dimension.

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