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Old 5th September 2011, 03:46 PM   #2631
MiiB is offline MiiB  Denmark
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I personally think that a mosfet amplifier driving some sets of Bipolar current dumpers is a good way to deal with complex loads,, let en bjt's do the crude current work and then let the fine lateral mosfet amplifier deal with the finer voltage adjustments..this way I believe we can get the best of both worlds...
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Old 5th September 2011, 04:01 PM   #2632
MiiB is offline MiiB  Denmark
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This is where a am right now....I have made a PCB..And will start to assemble when I have the last components here....It's basically an elaboration on Nico's take on Lazycats circuit...Show's some promise I think..
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Last edited by MiiB; 5th September 2011 at 04:04 PM.
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Old 5th September 2011, 05:07 PM   #2633
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Looks good to me. Nice transistors choosen. That in class a could be what i am searching for.
In the meantime i have being working on the PEN circuit a bit more. It sounds very good so i can recommend it as a quick fix. What came to my mind is an AIOG RIAA based on that but with a floating cascode input. i will draw something up and try it.
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Old 5th September 2011, 05:44 PM   #2634
MiiB is offline MiiB  Denmark
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bandwith more than 10 MHz....almost DC to light...
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Old 5th September 2011, 05:47 PM   #2635
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That is what i like, its fast.
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Old 5th September 2011, 06:05 PM   #2636
MiiB is offline MiiB  Denmark
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and very very good in distortion specter....The pcb I have made is without the bias network...as I have a feeling that a pure resistor-bias is enough to keep it thermally stable...as the negative temp-co of the laterals has a higher slope than the output btj's..If not Ill have to hard-wire it...
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Old 5th September 2011, 07:16 PM   #2637
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You will find out, sure.
Here is my AIOG PEN circuit. It looks a bit exotic even for me but it should work. The input stage is now my well known buffer, inverted and without the trimming resistors. I named the circuit Starless and Bible Black due to an article that Malkolm Hawksford wrote and is also a name of a Robert Fripp album.
The precision mirror has excellent DC stability so i hope i can use it without servo. The circuit is fully floating and needs a supply with one polarity only. If it works i plan to make a PCB this time.
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Old 5th September 2011, 07:56 PM   #2638
MiiB is offline MiiB  Denmark
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interesting with the GND reference... good way to get DC-coupling......looks like an interesting concept..temp-co could give some DC float

It could be made all SMD..with the BF parts. small and compact..

Last edited by MiiB; 5th September 2011 at 08:02 PM.
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Old 5th September 2011, 08:00 PM   #2639
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Yes, that what i am thinking of. The bipolars could be BC850-860.
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Old 5th September 2011, 08:51 PM   #2640
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Quote:
Originally Posted by Joachim Gerhard View Post
You will find out, sure.
Here is my AIOG PEN circuit. It looks a bit exotic even for me but it should work. The input stage is now my well known buffer, inverted and without the trimming resistors. I named the circuit Starless and Bible Black due to an article that Malkolm Hawksford wrote and is also a name of a Robert Fripp album.
The precision mirror has excellent DC stability so i hope i can use it without servo. The circuit is fully floating and needs a supply with one polarity only. If it works i plan to make a PCB this time.
Hi Joachim

Clever circuit.

The mirrors can of course be improved a bit, I know that you can make them better.

Cheers
Stein
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