SSLV1.1 builds & fairytales - Page 123

merlin el mago · 7th June 2012, 10:26 AM

Quote:

Originally Posted by samoloko

In BIB guide Is said that MOSFET has low Zo but BJT Is flat Zo
for a flat Zo at wide bandwidth what would you prefer BJT or FET

As you said if your priority is flat Zo & your Vout target is 5V or less take BJT.

samoloko · 7th June 2012, 01:00 PM

look at simulation last page In BIB - there Is not much difference between MOSFET and BJT regarding flat Zo
that Is why I ask If there are people with analyzer to take a noise vs freq curve within 1 Hz to greater than 100 KHz

merlin el mago · 7th June 2012, 03:52 PM

Salas I forgot to tell you that the NP D1 I/V only sounded with voice without presence or deep with the BiB and when I increased the volume I heard a little of hum, whit LM317 + LM337 sounded good no hum, any idea what happens? I tried 10uF MKT & 220uF lytic as Vref also zobel 10uF MKT+1R & zobel with 47uF lytic & without R?

Salas · 7th June 2012, 04:37 PM

Don't know, it can be the wide PSU bandwidth not helping the particular circuit. Any PSU is in the total current loop. Use whatever helps better a specific circuit. I don't know the analysis of the particular one to speculate more, not familiar with it. Hum beyond ground loops or ripple is also a sign of instability many times. Its either you can fully scope it and measure it and compensate it to play great with this reg or just skip it if it demands beyond simple experiments with parts you feel confident to perform. Or you can persist on trial & error.

merlin el mago · 7th June 2012, 05:00 PM

I'm really surprised is the first time that your regulator don't perform well

Salas · 7th June 2012, 05:16 PM

As I said its how you interface something with what, and to do it well in odd cases you need engineering data. That's life, no worries.

merlin el mago · 7th June 2012, 05:29 PM

I'm worried because isn't for me is for a friend who a spent a lot of money buying two R-Core, the pcbs, the components, the heatsinks, my work not because is my friend so it's free.

Salas a capacitance multiplier from Elliot Sound (attached pic) can be a good idea? the pic is for +-20Vout & I need +-15Vout Elliot said can be reach reducing 12K resistor.

P.S. thanks for help.

Salas · 7th June 2012, 05:43 PM

We are not allowed by Elliot to host esp schematics or encouraging copying them without permission, sorry.

Salas · 7th June 2012, 05:45 PM

Find another and we will discuss it. That schematic has to go.

merlin el mago · 7th June 2012, 05:47 PM

I'm sorry, I understand you delete the pic.

You don't have any other capacitance multiplier schematic?

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7th June 2012, 01:00 PM	#1222
samoloko diyAudio Member Join Date: Jun 2006	look at simulation last page In BIB - there Is not much difference between MOSFET and BJT regarding flat Zo that Is why I ask If there are people with analyzer to take a noise vs freq curve within 1 Hz to greater than 100 KHz

7th June 2012, 04:37 PM	#1224
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Don't know, it can be the wide PSU bandwidth not helping the particular circuit. Any PSU is in the total current loop. Use whatever helps better a specific circuit. I don't know the analysis of the particular one to speculate more, not familiar with it. Hum beyond ground loops or ripple is also a sign of instability many times. Its either you can fully scope it and measure it and compensate it to play great with this reg or just skip it if it demands beyond simple experiments with parts you feel confident to perform. Or you can persist on trial & error.

7th June 2012, 05:00 PM	#1225
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I'm really surprised is the first time that your regulator don't perform well

7th June 2012, 05:16 PM	#1226
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	As I said its how you interface something with what, and to do it well in odd cases you need engineering data. That's life, no worries.

7th June 2012, 05:29 PM	#1227
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I'm worried because isn't for me is for a friend who a spent a lot of money buying two R-Core, the pcbs, the components, the heatsinks, my work not because is my friend so it's free. Salas a capacitance multiplier from Elliot Sound (attached pic) can be a good idea? the pic is for +-20Vout & I need +-15Vout Elliot said can be reach reducing 12K resistor. P.S. thanks for help.

7th June 2012, 05:43 PM	#1228
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	We are not allowed by Elliot to host esp schematics or encouraging copying them without permission, sorry.

7th June 2012, 05:45 PM	#1229
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Find another and we will discuss it. That schematic has to go.

7th June 2012, 05:47 PM	#1230
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I'm sorry, I understand you delete the pic. You don't have any other capacitance multiplier schematic?