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Old 16th August 2012, 08:07 PM   #811
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I found a problem with the LT3092, TL431, and LM134 regulators. The maximum voltage across the devices is 40V, which is not enough for an amplifier with 24 volt rails. Back to the drawing board.
Lhquam. TL783 High Voltage Adjustable Regulator. It has an input - output differential voltage = 125V.
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Old 16th August 2012, 08:20 PM   #812
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it's easy to put resistor in series with CCS , to eat some voltage and keep it safe

not that I'm advocating idea of putting DC through secondaries , even with totaled fluxes

one Jfet will need different bias voltage from another etc.

going simpler isn't simplest always
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Old 16th August 2012, 08:42 PM   #813
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I am going to try simple V divider this weekend. Cant argue with its simplicity.
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Old 16th August 2012, 08:42 PM   #814
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Originally Posted by Zen Mod View Post
it's easy to put resistor in series with CCS , to eat some voltage and keep it safe

not that I'm advocating idea of putting DC through secondaries , even with totaled fluxes

one Jfet will need different bias voltage from another etc.

going simpler isn't simplest always
A series resistor will have a constant voltage across it. When the amplifier output is near the lower rail, the lower current source will stop working. Similarly for the upper rail.
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Old 16th August 2012, 09:05 PM   #815
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nobody tells that you must tie lower CCS to mid-rail/output

you can fed it from upper rail

besides that , if you put cap across that additional resistor .........

anyway - try it , best way to learn .......
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Old 16th August 2012, 09:15 PM   #816
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I was trying to uneerstand why it worked in BA output with similar rails, but could not work here.
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Old 16th August 2012, 09:27 PM   #817
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which BA , remind me
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Old 16th August 2012, 09:43 PM   #818
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Old 16th August 2012, 10:02 PM   #819
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Originally Posted by Zen Mod View Post
nobody tells that you must tie lower CCS to mid-rail/output

you can fed it from upper rail

besides that , if you put cap across that additional resistor .........

anyway - try it , best way to learn .......
In my previous post, I should have been more explicit. The upper ccs is where the real problem is. Without using capacitors, I see no way to avoid the upper FET gate approaching the upper rail. There isn't any voltage above to connect the ccs to.
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Old 16th August 2012, 10:04 PM   #820
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@buzz

in BA2 OS , same as in F4 , bias gen is bootstrapped , so it's mid can swing above and below rails

@lhquam - same trick - bootstrap ; somewhere ; maybe across that additional resistor or ....

but - as I'm not for CCS through coil solution , I'll not give you complete schm
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Last edited by Zen Mod; 16th August 2012 at 10:09 PM.
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