Simplistic NJFET RIAA - Page 314

guglielmope · 11th March 2010, 09:12 PM

Hello Salas,
I've selected the 2sk170 for the circuit of the post 2795 and they are from 8,1 to 8,3 mA selected in pairs plus one quad for the first stage Q1 Q7.
My input is 0,4mV and i don't use C10.
How I must modificate the resistors of the schematic for the correct gain?
Thanks a lot
Guglielmo

merlin el mago · 11th March 2010, 09:48 PM

Thanks, I have no room in Tx boox to mount the PS, the idea is in one box the regs. & phono & in other box the Tx & PS. I kill the Tx due to a wrong connection (are dual: primary 115-230 & secondary 20V/2.4A-40V/1.2A so I wired wrong) & when connected the Tx do a lot of noise. Tomorrow I will hear.

merlin el mago · 09:53 PM

Quote:

Originally Posted by massimo

I'd like to buy them...... can you tell me Vin and Vout?
(I mean 230 and 40 V AC) Thanks.

Primary 115 or 230V
Secondary 20V/2.4A or 40V/1.2A so 48VA

Mouser ref. 546-229-D40, price 14€44 each

merlin el mago · 11th March 2010, 09:54 PM

Quote:

Originally Posted by massimo

Which Xfrm did you order from Mouser? 229D40?

Yes.

merlin el mago · 11th March 2010, 09:57 PM

Quote:

Originally Posted by nicoch46

Good gob
but as you use two box ,why put the AC on signal box ?

Edit
ops Salas just note this...

Thks, it's provisional, I don't have room in the Tx boox, mine idea is 2 boxes, one for regs. & phono & the other for PS & Tx as usually do.

merlin el mago · 11th March 2010, 09:58 PM

Quote:

Originally Posted by salas

can arrange the rectification/cap filter boards in the external box with the transformers latter on i guess.

yes.

massimo · 11th March 2010, 10:04 PM

Quote:

Originally Posted by merlin el mago

Primary 115 or 230V
Secondary 20V/2.4A or 40V/1.2A so 48VA

Mouser ref. 546-229-D40, price 14€44 each

Yes, thank you. I knew those info. I was asking you the real value measured when loaded at 250 mA (or so) by the CCS

Salas · 11th March 2010, 10:12 PM

Quote:

Originally Posted by guglielmope

Hello Salas,
I've selected the 2sk170 for the circuit of the post 2795 and they are from 8,1 to 8,3 mA selected in pairs plus one quad for the first stage Q1 Q7.
My input is 0,4mV and i don't use C10.
How I must modificate the resistors of the schematic for the correct gain?
Thanks a lot
Guglielmo

Here you are, for your special situation.

merlin el mago · 10:24 PM

Follow Salas advice.

merlin el mago · 11th March 2010, 10:26 PM

Quote:

Originally Posted by massimo

Yes, thank you. I knew those info. I was asking you the real value measured when loaded at 250 mA (or so) by the CCS

Sorry how can do to tell you the information requested?

11th March 2010, 10:21 PM	#3139
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Follow Salas advice. Last edited by merlin el mago; 11th March 2010 at 10:24 PM. Reason: Follow Salas advice

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11th March 2010, 09:12 PM	#3131
guglielmope diyAudio Member Join Date: Nov 2004 Location: Udine	Hello Salas, I've selected the 2sk170 for the circuit of the post 2795 and they are from 8,1 to 8,3 mA selected in pairs plus one quad for the first stage Q1 Q7. My input is 0,4mV and i don't use C10. How I must modificate the resistors of the schematic for the correct gain? Thanks a lot Guglielmo

11th March 2010, 09:48 PM	#3132
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Thanks, I have no room in Tx boox to mount the PS, the idea is in one box the regs. & phono & in other box the Tx & PS. I kill the Tx due to a wrong connection (are dual: primary 115-230 & secondary 20V/2.4A-40V/1.2A so I wired wrong) & when connected the Tx do a lot of noise. Tomorrow I will hear.