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Old 7th June 2012, 02:00 PM   #1221
samoloko is offline samoloko  Bulgaria
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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
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Old 7th June 2012, 04:52 PM   #1222
merlin el mago is offline merlin el mago
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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?
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Old 7th June 2012, 05:37 PM   #1223
Salas is offline Salas  Greece
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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.
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Old 7th June 2012, 06:00 PM   #1224
merlin el mago is offline merlin el mago
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I'm really surprised is the first time that your regulator don't perform well
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Old 7th June 2012, 06:16 PM   #1225
Salas is offline Salas  Greece
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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.
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Old 7th June 2012, 06:29 PM   #1226
merlin el mago is offline merlin el mago
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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.
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Old 7th June 2012, 06:43 PM   #1227
Salas is offline Salas  Greece
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We are not allowed by Elliot to host esp schematics or encouraging copying them without permission, sorry.
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Old 7th June 2012, 06:45 PM   #1228
Salas is offline Salas  Greece
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Find another and we will discuss it. That schematic has to go.
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Old 7th June 2012, 06:47 PM   #1229
merlin el mago is offline merlin el mago
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I'm sorry, I understand you delete the pic.

You don't have any other capacitance multiplier schematic?
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Old 7th June 2012, 06:48 PM   #1230
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
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.

P.S. thanks for help.
Put your scope on the reg to I/V power rail in ac mode input and post a picture. If its a matter of bad interfacing it should show weird patterns or spikes instead of simply a line. In general if so, a 100uF cap across sense only locally on the reg, kills it.
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