The circuit is completely symmetrical so it's easy to guess - even easier if you take time to watch the video... 😉
With 15mA from each JFET providing 30mA through the 1k ohm = 30V. Only 15V left over on JFETs 😀
Thank you, very friendly!
I will wait for confirmation....🙂
oh, thanks flg, confirmation is already faster than light...!
I will wait for confirmation....🙂
oh, thanks flg, confirmation is already faster than light...!
Hi flg,
Which One was this...?
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
Which One was this...?
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
If you look better at the sch. you'll see two resistors (6k8 and 4k7) which divide the voltage between the PS rail and the ground and the middle point marked with 18V (and that's the Vds for JFETs). That's enough data to calculate the PS voltage even if you one didn't watch the video... 😉
Yes, it's very Curlian, and although I had not seen the Vendetta mc
stage previously, it's pretty obvious how one would do it.
In a less simple version the 1K resistors would be constant current sources,
and the supply voltage would be a lot lower. In this case though, we drop
30 volts across them for 30 mA current, and the 1K is a pretty large value
compared to the apparent impedance of the cascode's Source pin.
The standing voltage of the Jfets is about 15 volts or so, and they see peaks
of about 30V.
I recall that in the Blowtorch schematic that I did see that John was using
something like 200 ohms, but Jfets were not employed as the cascodes.
😎
stage previously, it's pretty obvious how one would do it.
In a less simple version the 1K resistors would be constant current sources,
and the supply voltage would be a lot lower. In this case though, we drop
30 volts across them for 30 mA current, and the 1K is a pretty large value
compared to the apparent impedance of the cascode's Source pin.
The standing voltage of the Jfets is about 15 volts or so, and they see peaks
of about 30V.
I recall that in the Blowtorch schematic that I did see that John was using
something like 200 ohms, but Jfets were not employed as the cascodes.
😎
I have tried 3 different folded stages, including the excellent Salas RIAA. In each I always like the sound of a buffer on the output more than running it without. Have you found this to be true in your explorations of the topology.
nice example of folded is Thagaard's RIAA (AXpress 01/2011), same as his 100W amp ( AXpress 10-11/2002)
don't forget wakoo A75 amp
Papa is folding (everything) longer than I'm wasting da air around .....
(I can't forget puzzled ppl around me , several years ago , on the beach ........ they were thinking - "wtf is wrong with that Dodo?!" , while I was laughing , looking at A75 schm ......... )
don't forget wakoo A75 amp
Papa is folding (everything) longer than I'm wasting da air around .....
(I can't forget puzzled ppl around me , several years ago , on the beach ........ they were thinking - "wtf is wrong with that Dodo?!" , while I was laughing , looking at A75 schm ......... )
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So the PCB will be designed by 6L6 includng the following options: double CCS and a symmetrical buffer à la B1 😀
It will?!? Wow! Ok... I suppose I should learn how to use Eagle or Gerber or something... That seems line it would be useful... 🙂 🙂 🙂
What I can do is Project Manage this circuit, and help see that there is a good PCB and support for this circuit. Assuming there is interest. 😎
😉😉😉
What I can do is Project Manage this circuit, and help see that there is a good PCB and support for this circuit. Assuming there is interest. 😎
😉😉😉
Papa is folding (everything) longer than I'm wasting da air around .....
The first X amplifier in '97, was folded cascode, getting 1000 watts with
two gain stages (the cascode itself not being a gain stage). You can see
it in the schematic of the patent.
😎
Realiser Demo
Just wondering how successful the Realiser demo was? Any feedback from participants or from Jan Didden would be appreciated.😀
Just wondering how successful the Realiser demo was? Any feedback from participants or from Jan Didden would be appreciated.😀
I would also add to the list a regulated psu inboard such as the salas psu used in the DCB1.
Regarding the circuit topology, what are the advantages of folded cascode? Where can one read more about it?
That is the 'Salas low-voltage shunt regulator' available from member 'Tea-Bag' as the "BiB" PCB.
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