yes that is what I found.
Like I said similar to the idea I had but this works for CCS.
What do you think?
EDIT: have you used this since you had link available right away? Does it work well?
I have seen the Bartola Gyrator. Depletion mosfets can also being run on fixed bias.
That could help to stabilize drift. I have the depletion CCS on my bench and could try this rather fast.
That could help to stabilize drift. I have the depletion CCS on my bench and could try this rather fast.
Since you claim it "is a very good idea for a temp compensated CCS" I thought you tried it ?
Stefano, you could try to build your solution and i will setup the Bartola CCS.
That is easier for me because i have the DN2540 allraedy on the bread board.
That is easier for me because i have the DN2540 allraedy on the bread board.
No I didn't. I meant to say that it looks like a clever idea and IMHO has potential to work.
I mean logic is straightforward and wouldn't see why it wouldn't work.
How it sounds, I have no clue.
Maybe this is easier to bias although Gm is lower then in the bigger one :http://documentation.renesas.com/doc/products/transistor/rej03g0122_2sj76ds.pdf
Unfortunately this is an EOL product.
Unfortunately this is an EOL product.
I found this, very similar to my original design :http://bildarkiv.hififorum.nu/Ryssen/Pic/Rör/diyAudio-CCS-beta2.pdf
In his book he mentions an HF / RF transistor with very low output capacitance.
Have to look it up.
In his book he mentions an HF / RF transistor with very low output capacitance.
Have to look it up.
Jaochim, could you please let us know when you have run the Bartola CCS how it works and how much gain do you get out of the gain stage?
Stefano, i am a bit slow today, sorry.
I had to redesign the Bartola because i do not have the small Supertex depletion mosfets.
I am trying a J-Fet for biasing now.
Franz has designed a stable CSS too. He requested that i review it before he posts it.
I had to redesign the Bartola because i do not have the small Supertex depletion mosfets.
I am trying a J-Fet for biasing now.
Franz has designed a stable CSS too. He requested that i review it before he posts it.
Concerning the noise from the CCS i thought that the noise will be divided by the gain the CCS brings. So it can be higher noise then the input stage. Also the output node is high impedance so i think the current noise matters more then the voltage noise. This is only a tendency and i hope i am right. I did not come up with a formula so far but it may be already somewhere in the books.
All this robbing and gunning !
In what world do we life today ?
Anyway, good news, The J-Fet - Depletion Fet CSS is rock solid and the stage amplifies.
Circuit comes soon.
In what world do we life today ?
Anyway, good news, The J-Fet - Depletion Fet CSS is rock solid and the stage amplifies.
Circuit comes soon.
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I have some concerns about the gain i am getting. If i have not wired something wrong it seems too low.