| Paul Ebert |
I just tried going to the Lovoltech website and was sent to a rather sneaky spam "search" site. Anyone else having this problem?
Is Lovoltech struggling? I sure hope not. |
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| Paul Ebert |
| Thanks. But, what happened to the Lovoltech website? What is the relationship between Lovoltech and Qspeed? |
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| GRollins |
Lovoltech is Qspeed. They changed their name about a year ago.
Grey |
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| Paul Ebert |
Shows how out of it I've been.
Thanks! |
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| gatedriver |
Datasheets are available, but i can't find any JFET info or product listing on the main site qspeed.com ....
Does this mean anything?
Regards
T |
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| GRollins |
Just for giggles, I tried to get to the datasheet by going through the main site and found that it's a "you can't get there from here" situation. Clicking on "All Products" brings up a diode...only. Nothing else. Clicking on "Technical Information" doesn't work either--you get more diodes.
Grey |
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| Nelson Pass |
Are we under the impression that power JFETs are not the
primary focus of this company? |
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| GRollins |
We might be tempted to reach that conclusion, yes.
Grey |
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| KSTR |
And they list 10 Sales offices in China/Taiwan (but the Chinese language option runs into the voids), plus two in Korea, and themselves for USA. Rest of the World: Nada. Shows their priorities, or they even might have been sort of "taken over", just look the names at the contact page, or here:
http://investing.businessweek.com/r...rivcapId=738277
Looks like another FET resource dying...
- Klaus |
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| GRollins |
They were unapologetic about their primary business focus when I talked to them way back when. The lion's share of the JFETs went to PC manufacturers in Asia. In that sense, there's no change.
At one point they had listed the power JFETs as being used in this, that, and the other thing...and in high end audio amplification. This gave me a case of the giggles because as far as I know, Nelson and I were the only ones who ever bought from them with that in mind.
Grey |
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| nobody special |
| And thanks again, Grey, for that group buy! |
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| EUVL |
> They were unapologetic about their primary business focus when I talked to them way back when.
Why should they ?
Semiconductor companies only exist to make money. And you don't make money supplying the "DIY Community".
It is totally understandable, however inconvenient, that the likes of Toshiba & Vishay stop producing JFETs one day, because they just don't bring enough revenue for the effort. Even if they were to sell direct for US$5 a piece, there is just not enough volume. You don't sell 100k 2SK389s a year !! They rather use the energy to make memory chips or what not with high volume.
Unfortunate for us, of course !!!!
Patrick |
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| GRollins |
It's not that they don't support audio, it's that they appear to be backing away from the power JFETs; which were designed for PC power supplies. We were accidental beneficiaries, true, but even the PC makers will be caught if they discontinue the power JFETs.
The deduction is that the power JFETs are not selling well, even to PC manufacturers.
Grey |
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| Nelson Pass |
| quote: | Originally posted by EUVL
> Even if they were to sell direct for US$5 a piece, there is just not enough volume. You don't sell 100k 2SK389s a year !!
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Actually, It's likely that you do. I doubt that 100K is adequate
to motivate Toshiba. Even a much smaller outfit like Qspeed
does not seem to have an interest in 100K annual quantities
when they consider the cost of development. |
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| hugobors |
I spoke with qspeed comercial service, and power jfet is out of production, and no future project of production.
:bawling: :bawling: :bawling: :bawling: :bawling: :bawling: |
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| Ipanema |
| Gonna put 10 pieces of my "precious" in the safebox now. Location? ssshhh..... I won't tell you....:clown: |
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| Nelson Pass |
I suspect that it was out of production when I bought my stock
almost three years ago. |
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| paulb |
I think we can also thank Nelson for our group buy.
Is there a Spice model available for the part? Might be nice to reference it here for those searching for it. |
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| apassgear |
| quote: | Originally posted by paulb
I think we can also thank Nelson for our group buy.
Is there a Spice model available for the part? Might be nice to reference it here for those searching for it. |
Don't forget Grey who did the GB and shelled the initial needed cash, plus all the effort of shipping to each of the members.
:cool: |
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| flg |
| quote: | Originally posted by paulb
I think we can also thank Nelson for our group buy.
Is there a Spice model available for the part? Might be nice to reference it here for those searching for it. |
I have the models from Qspeed :D But, at home, on my other putor... Have to wait till I get back there... Or, there are a few here I e-ed them too... |
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| GRollins |
| quote: | Originally posted by apassgear
Don't forget Grey...
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It was...educational. Most people were very nice, very easy to deal with. A few were difficult. The actions of the few came quite close to equaling the actions of the many.
My heartfelt thanks to those who were nice.
I've long considered the possibility of dipping a toe back into the audio waters. Manufacture would require far too much money and this isn't a good time to be a startup company. Being an importer/rep would be more headache than I could stand, I think. Retail is out of the question--did that for a while in the '80s and it ran the gamut from heaven to hell, frequently in the same hour. With the Lovoltech adventure, I tested the idea of being a parts supplier, i.e. one step removed from actual circuits. Learned a few things not to do but, surprisingly, found that most of the things I had mapped out in my head worked perfectly, first time, every time.
Grey |
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| moe29 |
personally, i was thankful that Grey stepped up and did such a great
job with that whole deal. |
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| paulb |
| ...especially since he's so incredibly busy with everything else. Thanks again Grey, I look forward to using them sometime...thought it might be a good idea to snap some up. |
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| flg |
| Yes, Thank You Grey. :D |
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| flg |
But. I also said I would do something. And I would erk :devilr: something in Grey that I don't want to. :whazzat: if I did... So Grey, skip to the next post... Pls ;)
Just change the .txt to .lib otherwise I suppose I will have to PM it :D |
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| carpenter |
| quote: | Originally posted by flg
But. I also said I would do something. And I would erk :devilr: something in Grey that I don't want to. :whazzat: if I did... So Grey, skip to the next post... Pls ;)
Just change the .txt to .lib otherwise I suppose I will have to PM it :D |
What the heck is that? :D |
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| flg |
...is what :whazzat:
Qspeed Spice models... LU1014D :angel: |
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| carpenter |
| quote: | Originally posted by flg
...is what :whazzat:
Qspeed Spice models... LU1014D :angel: |
At first, I thought I would see a wonderful schematic....
then I saw the "spice"....;)
Problem is, I don't know how to use spice. Oh well.:) |
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| Nelson Pass |
Like everyone else, you can learn. I use Microcap which you
can download free (student edition) from
www.spectrum-software.com
and play with the examples until you get some handle on it. |
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| Nelson Pass |
| Oh yeah. Cheers for that. |
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| carpenter |
I've downloaded Spectrum's sample software--bit of a learning curve, it seems.
I'm going through the tutorial--will be doing this more than once!:D
Is there a forum where the "spice" folks hang out? Maybe I can watch and learn.:) |
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| yggdrasil |
I downloaded the spicemodel and tried it with LTSpice. Got an error message though:
"Singular matrix: check nodes.... Iteration No. 1"
The actual node is the source of the jfet.
Any help would be wonderful. |
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| carpenter |
Amazing software. Thanks, Nelson.
I'm using the JfetBOZ configuration you gave us as my practice circuit. I'm just blown away--the sims save hours of bread-boarding and measuring. :) |
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| Nelson Pass |
Congratulations, and welcome to the rest of your life.
I know it's not easy climbing the first hurdle. |
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| R-K Rønningstad |
Here we hoped for a p-channel power JFET instead the only n-channel power JFET since the seventies disappears. And Toshiba is discontinuing their small signals p-channels as well. What a world. Well, the market decides it seems...
And what the heck. All my music comes via opamps in my CD/SACD/DVDA player anyway. (My LPs and accosiated JFET machinery is stored away.)
:bawling: |
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| jupiterjune |
| quote: | | Is there a forum where the "spice" folks hang out? Maybe I can watch and learn |
the "Spice Channel"?:) |
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| Nelson Pass |
| quote: | Originally posted by R-K Rønningstad
Here we hoped for a p-channel power JFET instead the only n-channel power JFET since the seventies disappears. |
And don't count on the continued availability of N channel power
JFETs either. |
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| carpenter |
| quote: | Originally posted by R-K Rønningstad
Here we hoped for a p-channel power JFET instead the only n-channel power JFET since the seventies disappears. And Toshiba is discontinuing their small signals p-channels as well. What a world. Well, the market decides it seems...
And what the heck. All my music comes via opamps in my CD/SACD/DVDA player anyway. (My LPs and accosiated JFET machinery is stored away.)
:bawling: |
Maybe there will be other jfets to take to place of the discontinued versions, but for kicks (and to hedge my bet) I'm playing with tubes--at least they'll be around for awhile. Imagine a tube version of the JfetBOZ...:) |
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| R-K Rønningstad |
FETs going.... SACD/DVD-Audio fading...
Tubes live on... LP lives on.
And a new CD-4 decoder for quad is under development.
:whazzat: |
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| Zen Mod |
| quote: | Originally posted by carpenter
............ Imagine a tube version of the JfetBOZ...:) |
well
re-think a little .................
then write that sentence again ........
:rofl: |
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| Babowana |
| quote: | Originally posted by R-K Rønningstad
SACD/DVD-Audio fading...
And a new CD-4 decoder for quad is under development.
:whazzat:
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Well . . . the groups of conspiracy are robbing our money for their commercial competition budgets in the name of new technology . . .
:darkside: |
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| R-K Rønningstad |
| quote: | Originally posted by GRollins
It's not that they don't support audio, it's that they appear to be backing away from the power JFETs; which were designed for PC power supplies. We were accidental beneficiaries, true, but even the PC makers will be caught if they discontinue the power JFETs.
The deduction is that the power JFETs are not selling well, even to PC manufacturers.
Grey |
I wonder why someone would need power JFETs in a PC? What in a PSU can a power JFET do that a power MOSFET can not?
(Maybe they found out just that...)
RK |
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| shallbehealed |
| quote: | Originally posted by R-K Rønningstad
I wonder why someone would need power JFETs in a PC? What in a PSU can a power JFET do that a power MOSFET can not?
(Maybe they found out just that...)
RK |
Efficiency. |
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| steenoe |
| quote: | Originally posted by shallbehealed
Efficiency. |
Maybe price-efficiency had the last word?
:) |
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| shallbehealed |
| quote: | Originally posted by steenoe
Maybe price-efficiency had the last word?
:) |
Seems so, although I've heard a couple of other companies announce power jfets for power distribution systems. |
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| flg |
| quote: | Originally posted by steenoe
Maybe price-efficiency had the last word?
:) |
I'm sure it boils down to profits ;) They have to convince the mfg'ers that it's what they need and costs less and occupies less real estate! :D And sell alot of 'em! MOSFETs are the king now, mostly in Sync-Buck switchers down to 1.2-2.5V and gobs of amps. I don't know if these pwr JFETs fit this application. It does make a good Linear, low drop-out type reg xistor.| quote: | Originally posted by shallbehealed
Seems so, although I've heard a couple of other companies announce power jfets for power distribution systems. |
Well, whom may I ask was that???
I've seen something, mostly in the deveopment stage, I beleive paired, or cascoded with a 1kV+ transistor :confused: If my brain cells are still good in that section, I beleive Silicon Carbide might have been involved??? :whazzat: It seemed a little to unobtainium at the time... |
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