In this case I must retrieve myself ...
Can I use the original circuit and try to clone the idea with "normal" jfets ?.. this is not a business subject. I only want to get rid of the opamp in the preamp.
Can I use the original circuit and try to clone the idea with "normal" jfets ?.. this is not a business subject. I only want to get rid of the opamp in the preamp.
A suggestion:
How about putting up a gerber for people to download?
Most here ought to be able to make a PCB themselves.
Magura 🙂
How about putting up a gerber for people to download?
Most here ought to be able to make a PCB themselves.
Magura 🙂
Firstly thank you all for your interests.
Pls realise this is NOT an opamp, but a JFET follower or unity gain buffer. If your application is precisely that, you can also make a TO92 version from 2 matched 2SK170s or 2SJ369s. Please read the beginning of the thread. I have explained that in detail already.
If you want to make a discrete opamp, like the Burson, OPAEarth, or OPAMoon, then you need to go to the other thread of mine and have a look at that.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=120445&highlight=
The opamp is much more complex, especially with stability and drift issues which does not make it a necessary direct plug-in to commercial opamps.
As to dual versions, have a look at the layout yourself and see whether you can pack 2x more components within the same footprint.
I have no objections for Jean-Paul to send the boards to someone else who is more committed to testing this seriously. He only needs to declare his committment to test here on the forum.
As to board availability, I shall eventually make them available, together with matched JFETs, after the evaluation by the 3 persons, who are today :
Dave
Jean-Paul (still)
Jim
I don't lay my PCBs with Gerber, so I cannot support that request.
Patrick
Pls realise this is NOT an opamp, but a JFET follower or unity gain buffer. If your application is precisely that, you can also make a TO92 version from 2 matched 2SK170s or 2SJ369s. Please read the beginning of the thread. I have explained that in detail already.
If you want to make a discrete opamp, like the Burson, OPAEarth, or OPAMoon, then you need to go to the other thread of mine and have a look at that.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=120445&highlight=
The opamp is much more complex, especially with stability and drift issues which does not make it a necessary direct plug-in to commercial opamps.
As to dual versions, have a look at the layout yourself and see whether you can pack 2x more components within the same footprint.
I have no objections for Jean-Paul to send the boards to someone else who is more committed to testing this seriously. He only needs to declare his committment to test here on the forum.
As to board availability, I shall eventually make them available, together with matched JFETs, after the evaluation by the 3 persons, who are today :
Dave
Jean-Paul (still)
Jim
I don't lay my PCBs with Gerber, so I cannot support that request.
Patrick
I chatted with Bob today... with Jim having chips already, i'll egt a parts order in for JP and myself. I should end up with lots of matched sets.
dave
dave
Nor do I use Spice to simulate, for that matter.
The only software I use are Autocad to make layouts and drawings, anc Excel to calculate circuit response from measurements of real devices.
😉
Patrick
The only software I use are Autocad to make layouts and drawings, anc Excel to calculate circuit response from measurements of real devices.
😉
Patrick
EUVL said:
We just might get along real well 🙂
Can you provide the Autocad draving of the PCB?
I Machine my boards, so this would be a short-cut.
Magura 🙂
If you really want to build this, then just make a committment here to report back in 2 months, and I am sure Jean Paul would be happy be send you the 2 PCBs that he got from me. Failing that, you'll get 2 from me, totally free of charge.
If not, then maybe you shouldn't have my ACAD files either.
😉
Patrick
If not, then maybe you shouldn't have my ACAD files either.
😉
Patrick
If you want, I can take your PCB and make a gerber out of it, I am about to have some PCBs made up in the next month or so in a similar form factor, so I could have these made up along with them, if that would interest you. all I would need is a screenshot of the board and a full schematic. I think i can have these made up in volume of about $100 for about $5 each give or take.
EUVL said:
No worries, I do not sell boards 🙂
2 months is a little tight in my book, so no, I can't commit to that.
Magura 🙂
Another tester
Hi,
if someone sends me the boards, I will test it (already have the parts ;-)
Greetings Till
Hi,
if someone sends me the boards, I will test it (already have the parts ;-)
Greetings Till
Please contact Jean Paul and ask him to send you his 2 PCBs.
You have my blessing to take over the test from him.
http://www.diyaudio.com/forums/showthread.php?postid=1791084#post1791084
Patrick
You have my blessing to take over the test from him.
http://www.diyaudio.com/forums/showthread.php?postid=1791084#post1791084
Patrick
> I only use Spice for stimulation.
This is a brilliant line. I like that. 😉
Hope you like my little chip just as well.
Patrick
PS I only use Spice for marinating ......
This is a brilliant line. I like that. 😉
Hope you like my little chip just as well.
Patrick
PS I only use Spice for marinating ......
Till,
if you do not manage to get the PCBs from J-P, drop me a PM with your postal address, and I shall send you a pair early next week by post.
Patrick
if you do not manage to get the PCBs from J-P, drop me a PM with your postal address, and I shall send you a pair early next week by post.
Patrick