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Old 2nd November 2012, 05:10 PM   #8431
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Old 2nd November 2012, 05:19 PM   #8432
studeb is offline studeb  United States
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i find polida as a seller on ebay, but they have not sold anything like 2sk170, last sale in 2007

and they are listed as being in Belgium not China

Quote:
Originally Posted by The Space Egg Corp View Post
Hi FET fans !!!

The postman got here from China today ( he looked exhausted ! )...
...with a 'test' of 10 Toshiba K170-BL...
...from eBay seller 'Polida'.
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Old 2nd November 2012, 05:27 PM   #8433
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search for 2sk170 on ebay and some pictures of sale item have polida written, it is not the name of the seller
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Old 2nd November 2012, 05:34 PM   #8434
studeb is offline studeb  United States
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got it
polida2008 is seller
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Old 2nd November 2012, 06:23 PM   #8435
AndrewT is offline AndrewT  Scotland
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Space Egg, looks like you have 2sk170.
Check the pinch off voltage.
You need a megohm resistor for this test.
From memory expect the lower Idss to have pinch off near 400 to 500mV and the higher Idss to be around 500mV to 700mV.

http://www.forsselltech.com/media/at.../JFET_Jig1.pdf
Measure Vgs/Vp (-ve value) when the 18V of the batteries are across the 1M & the jFET.

Instead of an ammeter use 100r and a voltmeter reading to 1.999V for the other tests.
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regards Andrew T.

Last edited by AndrewT; 2nd November 2012 at 06:29 PM.
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Old 2nd November 2012, 06:27 PM   #8436
Salas is offline Salas  Greece
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See #8380 also.
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Old 2nd November 2012, 07:04 PM   #8437
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Default Even SIMPLER ! :-)

MASantos...

...Joking aside...( Ha Ha ! )

I have been looking at the 'audio testing' possibilitys.

I think my obssesion level will reach about 101% on this project !!!
So...

Was looking at this...
...There's a thread somewhere, called ' JFET Bride Of Zen '...
...Here's a few versions of what they are messing with...
...Transistor-socket...BINGO...drop 'em in...pull 'em out...!...

Good for 'listening' to capacitors, resistors, WIRE !, chewing-gum foil, etc. etc.

Am thinking to make a 'balanced' something-like-this...
...could be interesting...
...a few component sockets...
...get a shunt-reg made first for decent PSU.

BOOM !

Si.

PS...My main concern with the eBay seller mentioned, is that CLEARLY the JFET's I recieved, are from NUMEROUS different batches, possibly 'left overs' from some kind of 'vague factory matching' somewhere.
At least with the 'ammo-belt' theory, you are getting a 'stream' right off the line.

Question...
...How much 'variation' or 'similaritys' or 'spread' do people who have bought 'ammo-strip' get ?

Salas ? Merlin ? Ricardo ?
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Old 2nd November 2012, 07:47 PM   #8438
atupi is offline atupi  Romania
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If my Simplistic goes to a DCB1 what should be the minimum value of the output cap of Simplistic ?
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Old 2nd November 2012, 08:27 PM   #8439
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Quote:
Originally Posted by atupi View Post
If my Simplistic goes to a DCB1 what should be the minimum value of the output cap of Simplistic ?
What's the input impedance of your DCB1?
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Old 2nd November 2012, 08:31 PM   #8440
atupi is offline atupi  Romania
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I don't know, maybe Salas knows better. I suppose is high, tens of kohms.
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