John Curl's Blowtorch preamplifier part II - Page 4176 - diyAudio
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Old 13th July 2013, 06:48 PM   #41751
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Originally Posted by scott wurcer View Post
Is JC still without password? Isn't this where he usually says things have calmed down so it's time for some more old stories?
One of the oldest stories is supposed to be:

A lad is eager to marry the daughter of a rich caravan merchant. The merchant disapproves because the lad has no money.

The lad consults a wise man, who counsels him to ask to join the merchants caravan in a lowly position so that he may prove himself worthy. But also when he receives his share at the caravan's farthest stop to offer all his money to buy the merchants soul. Then when he returns he should come back and the wise man will see to it that he can marry the girl.

So the lad joins the caravan, works menial jobs and is tormented throughout the journey. At the far end he receives but a pittance.

He goes to the merchant and makes the offer to buy the mans soul for all of that money. The merchant sees him as a fool and to teach him a lesson takes the money and then explains to him there is no such thing as a soul. You cannot see it, touch it, eat it, nor does it have any other uses and cannot even be traded.

Well that night the merchant does not sleep well. The next day he goes to the lad and offers to give him his money back if he has learned his lesson. The lad refuses.

As the journey back continues, every so of the merchant offers more money to buy his soul back. The lad continues to refuse. Finally the merchant asks why and finds out the wise man's instructions.

So at the end of the journey the merchant and the lad go to see the wise man. The merchant says he has cheated the lad out of his money and wishes to return it, but the lad refuses.

The wise man explains to the merchant that even though he cannot see or feel his soul it is the most valuable thing he owns. If he wishes to get it back he must give half of his business to the lad and now that the lad has money, also to let him marry his daughter.

So there are stories older than John's.

ES
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Old 13th July 2013, 08:04 PM   #41752
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Originally Posted by bcarso View Post
Maybe we've all run out of things to say and people to insult.
I'm an insult to myself, can keep that up till the very last day.
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Old 13th July 2013, 09:04 PM   #41753
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Scott Wurcer,
In the thread where you have your discrete opamp design how would you take that basic premise and use it in a preamp? I have tried to stay up with that thread and was wondering how you would practically implement that design into a working circuit rather than the old obsolete and almost impossible to obtain devices that so many still are designing around?
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Old 13th July 2013, 09:48 PM   #41754
jcx is offline jcx  United States
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discontinued is different from obsolete

and the fets Scott uses aren't "new"
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Old 13th July 2013, 10:23 PM   #41755
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jcx,
Yes you are correct in that statement. But it would be nice to see designs based on devices that are currently in production and not from someones stash of discontinued devices. Just the name Fairchild tells you that they are not in production anymore as that company has ceased to exist. Just one of many it seems today that were some of the best not that long ago.
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Old 13th July 2013, 11:16 PM   #41756
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Originally Posted by Kindhornman View Post
jcx,
Yes you are correct in that statement. But it would be nice to see designs based on devices that are currently in production and not from someones stash of discontinued devices. Just the name Fairchild tells you that they are not in production anymore as that company has ceased to exist. Just one of many it seems today that were some of the best not that long ago.
Fairchild is alive and well. Power Management IC | Mobile Semiconductors - Fairchild Semiconductor

EDIT: Having said that, a visit to their site shows them deemphasizing certain small-signal discretes, particularly ones with leads favored by diy. However, there are substitutes.

I'm afraid we're all going to have to get used to SMD, like it or not.

Last edited by bcarso; 13th July 2013 at 11:23 PM.
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Old 13th July 2013, 11:21 PM   #41757
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And here I thought that they had disappeared from the scene! I know at one time I was looking for some of their devices and came up with nothing doing a web search. Must have done something extremely stupid if I couldn't find them,
Thanks Brad.

Last edited by Kindhornman; 13th July 2013 at 11:25 PM.
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Old 14th July 2013, 03:06 AM   #41758
qusp is offline qusp  Australia
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Fairchild are quite big in FPGA, logic buffers etc and wont be going away any time soon.
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Old 14th July 2013, 04:38 PM   #41759
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On the subject of parts, most are probably aware that Diodes Inc. absorbed Zetex and still support some of their transistors. On Semi, having begun I believe as a company spun off from Motorola discretes, also keeps some of those parts alive, and more recently acquired Sanyo discretes. Some of these parts are key for the sorts of things we do or profess to do in here.

Toshiba continues to make a few things but of course famously discontinued the dual JFETs. If we are going to try to emulate the fully complementary designs of JC and others we will have to hope for success in the efforts at Linear Integrated Systems to make good large-area short-channel P parts.

I went back again to the Fairchild site and found more leaded bipolars, which are also stocked by Mouser with no warnings from either that they are on their way out. The puzzle is why Fairchild makes them so hard to find, as their search map, unless I missed something, omits any mention of the category. This may be an ominous sign or just a blunder. In any case, many of the parts are so cheap that if you need a couple I'd get a hundred pieces. Of course that's why I have a lot of parts , although not really production quantities.
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Old 14th July 2013, 04:59 PM   #41760
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next time I won't just clik thru the "user survey" - they have broken the site for engineers who know what the part they want is called
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