Zen Mod said:
indeed !
Choky, you just made my day! 😀
jacco vermeulen said:
Are you serious! I'd visit you in a heartbeat. Catch me in the winter, when work's slow.
Hi Carpenter,
Nice house, and yes, especially "the tower".
The room on last floor would be ideal for a little library and desk ... sometimes I dream of something like that ...
😉
Manu
Nice house, and yes, especially "the tower".
The room on last floor would be ideal for a little library and desk ... sometimes I dream of something like that ...
😉
Manu
Very nice place Carpenter! I showed my girlfriend and she loved it too, especially with the tower.
I have actually switched back to the resistor. I have now reduced my V+ down to 16v, I couldn't hear much of a difference. Yes, I am winging this one still, do everything by ear for now.
Running somewhere in the neighborhood of 2mA-3mA with 9.4v on the drain and 1.5v on the source, set by the LED. I have some time now, my girlfriend went back "home" (school)
...5 years of seeing each other twice a month during school and a little more in the summer. I think I will play around with different LED's, different CCS's, and I may have to break out some tubes.
I am thinking after some tubes get built I will have to give the cute little B1 a shot. The JFET BoZ has been a nice little welcome back to Mr. Pass's wonderful realm of SS!
Listening and tinkering time 😎
Cheers
James
I have actually switched back to the resistor. I have now reduced my V+ down to 16v, I couldn't hear much of a difference. Yes, I am winging this one still, do everything by ear for now.
Running somewhere in the neighborhood of 2mA-3mA with 9.4v on the drain and 1.5v on the source, set by the LED. I have some time now, my girlfriend went back "home" (school)
...5 years of seeing each other twice a month during school and a little more in the summer. I think I will play around with different LED's, different CCS's, and I may have to break out some tubes. I am thinking after some tubes get built I will have to give the cute little B1 a shot. The JFET BoZ has been a nice little welcome back to Mr. Pass's wonderful realm of SS!
Listening and tinkering time 😎
Cheers
James
Thanks for the compliments, guys.
I built this house from the ground up--been at it since 1988, when I purchased the property.
That third story tower room is part of the master-bedroom. At 1000 sq. ft. the bedroom gives me sanctuary when I wish to be left alone. Ellen likes to entertain her girlfriends a lot.
Kept me out of trouble during the pre-Internet years...😀
It's been interesting...
I built this house from the ground up--been at it since 1988, when I purchased the property.
That third story tower room is part of the master-bedroom. At 1000 sq. ft. the bedroom gives me sanctuary when I wish to be left alone. Ellen likes to entertain her girlfriends a lot.
Kept me out of trouble during the pre-Internet years...😀
It's been interesting...
Running a CCS now set at about 5mA with 16v V+. The LED has temporarily been replaced by a 1.5v battery (D Cell). It is very inky black in the background now, the PSRR of the CCS helped a lot, along with the purity of the battery. Sounds nice, still some fine tuning to do, but I think I may be onto something. Soon I will have to try with a real choke load, just to compare.
Cheers
James
Cheers
James
Apparently my head was on sideways when I decided to play with source devices. It sounded pretty good with the LED and quieter with the battery. Then I got to really listening, I noticed things I didn't like, clipping-like sounds, garbage, and things just didn't sound quite right. I decided to give it a switch back to the 10R resistor on the source. I knew in my heart that the poor little JFET wasn't biased right at all, but kept right on tinkering. Now with the resistor back, what a difference. The detail is all still there, the dynamics, all that, the background is still black...it appears it was the CCS that did this. However it all just sounds more...right...for the lack of a better word. Warm and buttery smooth yet very reviling, I am listening to Ani DiFranco - Living in Clip, I can very much tell it is live. It really does sound like I am there, the amount of background detail is amazing. I am going to have to pit this against a couple of tube pre's and see how it fairs. Makes me want to hear a B1 since I don't really need the gain all that much.
I'm sorry I ever doubted you Mr. Pass as far as the 10R resistor. The CCS is set now at roughly 5mA and the V+ is still 16v. I may have to try some tests at around 12v, this may be a candidate for a spare 12v battery. I was thinking maybe of trying a Zetex FET or maybe a BJT on the output as a follower, not sure if it is really needed, it isn't driving anything exotic. So far this thing blows away my old P88, even with the much talked about LM4562's, I may have to find another project for those little buggers if I decide I ever want to listen to chips again.
Cheers
James
PS: I know I already said it, but Carpenter, beautiful house! 1000sq.ft. bedroom is like the size of my GF's apartment
Quite an undertaking but it appears to be well worth it, would love to see the finished product. Good luck and happy building!
I'm sorry I ever doubted you Mr. Pass as far as the 10R resistor. The CCS is set now at roughly 5mA and the V+ is still 16v. I may have to try some tests at around 12v, this may be a candidate for a spare 12v battery. I was thinking maybe of trying a Zetex FET or maybe a BJT on the output as a follower, not sure if it is really needed, it isn't driving anything exotic. So far this thing blows away my old P88, even with the much talked about LM4562's, I may have to find another project for those little buggers if I decide I ever want to listen to chips again.
Cheers
James
PS: I know I already said it, but Carpenter, beautiful house! 1000sq.ft. bedroom is like the size of my GF's apartment
Quite an undertaking but it appears to be well worth it, would love to see the finished product. Good luck and happy building!
Lineup Audio, 2SK170GR jfet-boz version 1.0
Electronics Workbench MultiSim Professional
Often short called EWB
http://www.ni.com/multisim/whatis.htm
in year of 2006 i downloaded one 'cracked' version
using my torrent downloader program:
µTorrent - The Lightweight and Efficient BitTorrent Client
i have several other professional spice simulation programs (pirated versions)
but i do not use them much.
because i have learnt very well howto use my MultiSim
even for making nice publishing of circuits, schematics & test results
The hard work with most of these Spice programs
is to add more Audio Transistor models for use in your circuits.
But we have rather many spice models in the www.diyaudio.com topics.
In the gigantic Archives of this forum!! 😎
The PCB Layout part of EWB is UltiBoard.
With this you can create also PCB of any circuit you have run in MultiSim.
Ultiboard – Printed Circuit Board Layout and Routing
Lineup 😎 audio regards
As often I usedw8083 said:
Electronics Workbench MultiSim Professional
Often short called EWB
http://www.ni.com/multisim/whatis.htm
in year of 2006 i downloaded one 'cracked' version
using my torrent downloader program:
µTorrent - The Lightweight and Efficient BitTorrent Client
i have several other professional spice simulation programs (pirated versions)
but i do not use them much.
because i have learnt very well howto use my MultiSim
even for making nice publishing of circuits, schematics & test results
The hard work with most of these Spice programs
is to add more Audio Transistor models for use in your circuits.
But we have rather many spice models in the www.diyaudio.com topics.
In the gigantic Archives of this forum!! 😎
The PCB Layout part of EWB is UltiBoard.
With this you can create also PCB of any circuit you have run in MultiSim.
Ultiboard – Printed Circuit Board Layout and Routing
Lineup 😎 audio regards
carpenter said:
D., what a relief, i was already experiencing symptoms of the shrinking asparagus syndrome.
jacco vermeulen said:
Ha! 😉 😀
When you do most of the work yourself (read: lower middle-class income and can't afford to pay for the labor) it takes awhile. Lord, it would be so easy if I were rich...😀
Same reason for DIY Audio.... but with DIY, I learn so much.
Someday, when I leave this planet, I'll go happy.
You folks are a lot of fun to know.
James. I love your passion. Thanks for sharing your results with us. For all our playing, it funny how Nelson gets it so right.
carpenter said:
The special bonus part is experiencing time and again how much more a bunch of the diy-bugs overhere have in common, even more so to discover that also applies to the Masta.
We're having 30k worth of new windows/doors placed in a couple of weeks, first time ever for me to change my mind and have things done instead, i had long forgotten to spend on stuff i am able to do myself.
I live on richie lane, can't honestly say i respect most of my neighbors.
2 decades is some mileage, but i bet you're damned proud of yourself, woodpecker.
It seems to me, if you were happy with the circuit using a 10R in the source, @5mA Id, then the LED set-up will be drastically different. I beleive that may be a little to low of an operating current for the LED to work well?
10R*.005A=50mV Vgs. Probably a little low (running close to Idss) but O.K. if you aren't driving to hard.
However, when using the LED you will now have 1.5V + or - Vgs. This will bring the Id way down.
I remeber a thread here where these guys tested all kinds of diodes, zeners, LEDs, etc. LEDs are great, low noise and all. Ussually better than Zeners depending on the necessary voltage. But, they also found the old standby 1n4148 to be among the best, low noise devices. You would probably get about .5-.55 Vgs with one of those. Give one of those a try if you can
Just my 2cents
10R*.005A=50mV Vgs. Probably a little low (running close to Idss) but O.K. if you aren't driving to hard.
However, when using the LED you will now have 1.5V + or - Vgs. This will bring the Id way down.
I remeber a thread here where these guys tested all kinds of diodes, zeners, LEDs, etc. LEDs are great, low noise and all. Ussually better than Zeners depending on the necessary voltage. But, they also found the old standby 1n4148 to be among the best, low noise devices. You would probably get about .5-.55 Vgs with one of those. Give one of those a try if you can
Just my 2cents
"My home is a Castle"
Hey John,
That's some home you've built there, big house plus family - looking pretty good - 20 years is about right for a "castle", as they call a big 'self built' home over here.
Did you set aside a 'music room'?
The little project about the diodes, trannies and caps plods along - the T-Network caps arrived but still waiting for the Cree SiC diodes - it's been quite "interesting"! The "bottle" diodes are looking better all the time!
On topic:
Did you do try out "lineups" circuit variation (as per post #93) when doing all that sim work?
Hey John,
That's some home you've built there, big house plus family - looking pretty good - 20 years is about right for a "castle", as they call a big 'self built' home over here.
Did you set aside a 'music room'?
The little project about the diodes, trannies and caps plods along - the T-Network caps arrived but still waiting for the Cree SiC diodes - it's been quite "interesting"! The "bottle" diodes are looking better all the time!
On topic:
Did you do try out "lineups" circuit variation (as per post #93) when doing all that sim work?
As far as using lineups circuit ideas, he is correct chasing down high voltage operating points. There is quite a bit of improvement to be gained with some topologies using high voltage. And the folks that like the sound of resistor loading can be happy too!
However, as N.P. reminds you, sometimes there is a "sweet spot" and it may not be with a high voltage supply
FYI: My quasi BOSOZ circuit runs at +80V, -20V, and it's a 5X improvement over the standard version 😀
However, as N.P. reminds you, sometimes there is a "sweet spot" and it may not be with a high voltage supply
FYI: My quasi BOSOZ circuit runs at +80V, -20V, and it's a 5X improvement over the standard version 😀
Re: "My home is a Castle"
Thanks for the nice words, James.
I constructed a 25 foot by 25 foot room with 13 foot ceilings for audio and video. I'm using a 12 foot by 8 foot screen for my projector.
On occasion, the little JfetBoz operates my F4 into the HF horns. Very nice stuff. I use my ZV7-TBCJ amps the rest of the time.
I haven't simmed Lineups circuit. I think I will. I've been rather busy writing a novel and when combined with finishing my house, leaves precious little time for DIY Audio. So, I check in here often and enjoy vicarious thrills. 😀 BTW, the super computer in my novel is called JAMES.
jameshillj said:
Thanks for the nice words, James.
I constructed a 25 foot by 25 foot room with 13 foot ceilings for audio and video. I'm using a 12 foot by 8 foot screen for my projector.
On occasion, the little JfetBoz operates my F4 into the HF horns. Very nice stuff. I use my ZV7-TBCJ amps the rest of the time.
I haven't simmed Lineups circuit. I think I will. I've been rather busy writing a novel and when combined with finishing my house, leaves precious little time for DIY Audio. So, I check in here often and enjoy vicarious thrills. 😀 BTW, the super computer in my novel is called JAMES.
Gotta watch them super-computers!! Can develop minds of their own - James (Darth) Joyce, eh!
Nice high ceiling for square room - asking for distributed sub-base speakers - big screen - relaxation centre.
I wonder if "lineups" variation could be extended to the Lightspeed Vol control like the B1 buffer, etc? If you get a chance to fire up your sim machine, .....
Nice high ceiling for square room - asking for distributed sub-base speakers - big screen - relaxation centre.
I wonder if "lineups" variation could be extended to the Lightspeed Vol control like the B1 buffer, etc? If you get a chance to fire up your sim machine, .....
I've tried a few versions of the jboz. First, i tried it on stripboard with trimpots on place of RS and RD. I liked the sound and decided to pursue the idea further. I then added in another (10k) trimpot, connected from output to gate to see what feedback does (it had too much gain for my needs anyway). Being a "single ended class A" thinker, I was not too optimistic, but as it was local feedback, not global, I gave it a try. The results were very pleasing. The character didn't change all that much, but there was definitely less distortion. I made a couple of PC boards and a charging circuit for the 9v batteries and built it all into the box I was going to use for an Aikido preamp. I settled on 22r source resistors, since so many in this thread had used them. The sound was impressive, bringing out detail that I had sometimes missed with my passive pre, but I noticed in busy passages that there was a little less clarity.
I then tried to add in a red LED based CCS between the source and ground, but it didn't work. (that is another discussion). But I was also worried that the extra current to run the CCS's would have drained the batteries too fast. I went back to the beginning of the thread to read it all through (for the umpteenth time!) and lo and behold, there was a gem from NP I had missed before:- "The device is self biased, and we want the highest value of bias possible for lowest distortion which makes us want to use a low value Source resistor to ground." So I tried going down to 5ohms with the source resistors - boy, what a difference! It is now so clean I can hardly believe it. Never mind the CCS! Clarity in spades, but without the valve-like colouration of 2h distortion. I will have to run it like this for a while and see how it feels with extended listening.
I then tried to add in a red LED based CCS between the source and ground, but it didn't work. (that is another discussion). But I was also worried that the extra current to run the CCS's would have drained the batteries too fast. I went back to the beginning of the thread to read it all through (for the umpteenth time!) and lo and behold, there was a gem from NP I had missed before:- "The device is self biased, and we want the highest value of bias possible for lowest distortion which makes us want to use a low value Source resistor to ground." So I tried going down to 5ohms with the source resistors - boy, what a difference! It is now so clean I can hardly believe it. Never mind the CCS! Clarity in spades, but without the valve-like colouration of 2h distortion. I will have to run it like this for a while and see how it feels with extended listening.
Dear hihopes,
I was thinking the whole evening on your results.
Why not a little local feedback,that's a point.
Could you post your Drain Voltage and resistor values for your best results?
Of course everybody has to experiment on his own, but some more information from would be nice.
Thanks for your efforts
Sam🙂
I was thinking the whole evening on your results.
Why not a little local feedback,that's a point.
Could you post your Drain Voltage and resistor values for your best results?
Of course everybody has to experiment on his own, but some more information from would be nice.
Thanks for your efforts
Sam🙂
It seems that Mr. Pass SE J-Fet stage starts a revolution all over the world.
http://www.lampizator.eu/LAMPIZATOR/FETISHIZATOR/fetishizator.html
http://www.lampizator.eu/LAMPIZATOR/FETISHIZATOR/fetishizator.html