MLA Posted February 26, 2021 Report Share Posted February 26, 2021 (edited) Arrow also has stock. Get 'em while you can Edited February 26, 2021 by MLA 1 Quote Link to comment Share on other sites More sharing options...
mwl168 Posted February 26, 2021 Report Share Posted February 26, 2021 Probably not a bad idea to also get the corresponding KSC2690 as well. 1 Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted February 26, 2021 Report Share Posted February 26, 2021 (edited) suitable replacements seem to be 2sa1552 / 2sc4027 toshiba tta004b / ttc004b also look compatible Edited February 26, 2021 by kevin gilmore 1 1 Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted February 26, 2021 Report Share Posted February 26, 2021 FWIW I measured the TTA004b/TTC004b a little while ago. Proviso is that they are only in the range <12V and <10mA. But I have measured Cob and Early Voltage. Toshiba TTA004 TTC004.pdf 1 Quote Link to comment Share on other sites More sharing options...
sbelyo Posted February 26, 2021 Report Share Posted February 26, 2021 Does anyone have 2 pairs of lsk389/lsj109 ? Quote Link to comment Share on other sites More sharing options...
mwl168 Posted February 26, 2021 Report Share Posted February 26, 2021 (edited) 6 hours ago, kevin gilmore said: suitable replacements seem to be 2sa1552 / 2sc4027 toshiba tta004b / ttc004b also look compatible I bought a bunch of tta004b/ttc004b for this exact purpose but have not tried them yet. Would be nice if we can find something that's also pin-compatible with 2SK216/2SJ79. Edited February 26, 2021 by mwl168 Quote Link to comment Share on other sites More sharing options...
Ulfar4 Posted February 27, 2021 Report Share Posted February 27, 2021 Does anyone know where to buy 2sk216? I need two pieces, there are plenty of them on ebay but I bet that they will all be fake ones. Or if anyone have two pieces? Quote Link to comment Share on other sites More sharing options...
JoaMat Posted February 27, 2021 Report Share Posted February 27, 2021 (edited) Check this partco.fi/en. They claim they have 8 pieces of 2SK216 in stock at EUR 4.28 each. I don’t know anything about Partco. But Finnish people tend to be reliable. 03/01/2021. They seem to be gone. Edited March 1, 2021 by JoaMat 1 Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted February 28, 2021 Report Share Posted February 28, 2021 On 2/26/2021 at 8:39 AM, jamesmking said: quick heads up KSA1220AYS transistors are now END OF LIFE https://www.mouser.co.uk/ProductDetail/ON-Semiconductor-Fairchild/KSA1220AYS/?qs=ljbEvF4DwOOJTVoo5AYsWQ%3D%3D 😞 mouser is currently out of stock radio spares has stock farnell is out digikey is out That is just part of OnSemi's quest to obsolete anything remotely of use to audio. They took over Fairchild and Sanyo and have systematically removed many much loved discrete transistors from both their lines. I hate OnSemi with a passion. A big fucking hatred. A big fucking passionate hatred. 1 Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted February 28, 2021 Report Share Posted February 28, 2021 It isn't confined to On-Semi. Rohm did the same thing with all their low noise offerings ages ago, So did Renesas with the J79/K216 - in fact lateral MOSFETs are a thing of the past. Most p-channel jFETs have gone, and many low-noise jFETs of any flavour. The latest to go is the very low noise J107 (another On-Semi casualty). NXP killed off the n-jFET BF862 (lower noise than the K170) and indeed all jFETs, period. Analog Devices has just EOL'd the monolithic dual MAT01, unusual because it BVceo is 45V; every other low-noise dual is 40V. So in one of my applications where the maximum Vce is 41V it is the only part that will do. Hell On-Semi even obsoleted that ubiquitous BC560! OK they still make the SM version, the BC860, but it is tough nuts if you needed the power dissipation of a discrete part. If a part does not go in an automotive, mobile device, TV or other ultra-high volume application, semiconductor manufacturers lose interest real fast. The glimmers of hope are Toshiba, Diodes Inc, Linear Systems and THAT. And LS is the only one with a credible line up of single and dual jFETs and dual bipolars in multiple package choice. 3 2 Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted February 28, 2021 Report Share Posted February 28, 2021 The other one I forgot to mention if you have deep pockets is Interfet. They do have possibly the lowest noise n-JFET ever, the IF3601/3602. These have wild and unpredictable Idss, but a noise voltage of typically 0.3nV/rootHz and a noise corner of a few Hz. If you can bear that $100 price tag for the dual version and $30 for the single. Quote Link to comment Share on other sites More sharing options...
jose Posted February 28, 2021 Report Share Posted February 28, 2021 Add to the list all the sand related to high voltaje. Who said that silicon was expensive? Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted February 28, 2021 Report Share Posted February 28, 2021 Damned right. All the high voltage, low capacitance stuff went west when "conventional" CRT based TV's bit the dust and flat screen took over. All of which needed a radical rethink of how to do solid state electrostatic headphone amps. Quote Link to comment Share on other sites More sharing options...
jose Posted March 1, 2021 Report Share Posted March 1, 2021 Besides, there are also companies that close or go bankrupt... I have several grains of sand from Semisouth designed for use in solar panels/conversors AC/DC (and later on amplifiers obviously 😉) that today cost a small fortune. Quote Link to comment Share on other sites More sharing options...
navigator Posted March 10, 2021 Report Share Posted March 10, 2021 Hi, I just about to finish a Dynalo Mini and strugglig with the input fets. I did read a lot back this thread and I see what is obsolete etc., but I can not find what I can order. I know on ebay there are unknown sellers selling these, but if you guys have a suggestion I can get from Mouser / Farnell / similar, that would be great. I've looked these so far: 2SC3381 2SA1349 2SK389 2SJ109 LSK489 LSJ689 2SK170 2SJ74 Thanks a lot!! Quote Link to comment Share on other sites More sharing options...
Pars Posted March 10, 2021 Report Share Posted March 10, 2021 The only ones in your list currently available (without contortions) are the Linear Systems LSK489 / LSJ689. These are available from Trendsetter in the US. I'm not sure who in Europe carries them. You didn't indicate where you are, but judging by the Farnell I assumed Europe. Quote Link to comment Share on other sites More sharing options...
MLA Posted March 10, 2021 Report Share Posted March 10, 2021 For Europe and for the 489/689, I was referred by Linear to: Ingenieur-Buero-Fluck Country:Germany Phone:+ 49-7533-949-8760 Fax:+ 49-7533-949-8762 Email:[email protected] Website:http://www.ib-fluck.de which turned out to be very close to a one man operation However, they didn't sell the 689 to private customers at the time (two years ago), so I had to use a company address to get those. Quote Link to comment Share on other sites More sharing options...
Pars Posted March 10, 2021 Report Share Posted March 10, 2021 Micross in the UK was the one I was thinking of. Take a look here: http://www.linearsystems.com/purchase.html It would be nice if Linear would just go thru normal distributors like Mouser, Digikey, etc. Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted March 10, 2021 Report Share Posted March 10, 2021 I've bought quite a few Linear Systems single and dual JFETs from Micross. The pain in the ass is that you have to complete and end-user form now for every damned order. It didn't used to be the case, but must relate to some change in US export rules, possibly during the administration of the orange menace. Mind you it is not as onerous as importing potentially sensitive semiconductors covered by ITAR (International Traffic in Arms Regulations), which many space qualified semiconductors are. You have to sign documents that say you will go to jail if you sell them on, or even lose them. They need to be stored in a locked location, a register of use kept and signed, and any devices you don't use must be destroyed or returned. Fortunately launching into space qualifies as "destroyed"! 2 Quote Link to comment Share on other sites More sharing options...
navigator Posted March 10, 2021 Report Share Posted March 10, 2021 ..hmmmm... Interesting. It is really this problematic. I thought there are just replacements what I can order from big ones like RS, but I realize it is far more complex and now I understand why we can buy these pairs on ebay. :-( Thanks for your help! Quote Link to comment Share on other sites More sharing options...
Pars Posted March 10, 2021 Report Share Posted March 10, 2021 The diyaudio store offers matched quads (2 N, 2 P) of the singles also. https://diyaudiostore.com/collections/jfets/products/linear-systems-matched-jfets?variant=30120611840034 Quote Link to comment Share on other sites More sharing options...
Augsburger Posted March 26, 2021 Report Share Posted March 26, 2021 To me this looks like a small pressure pad but to Digikey, Ebay, Amazon and the rest of the internet it is something else. There is no manufacturer name or part number so that is a dead end. Can anyone name this part or guide me as to where I can find a replacement. Quote Link to comment Share on other sites More sharing options...
Augsburger Posted March 29, 2021 Report Share Posted March 29, 2021 Nothing? OK, I guess I will ask Henyo.... Quote Link to comment Share on other sites More sharing options...
JoaMat Posted April 3, 2021 Report Share Posted April 3, 2021 (edited) Is there any easy way to invert (“convert from positive to negative”) a gerber file. I want to invert the solder paste gerber file – then I think I can make a CNC file and mill PCB stencils. Or at least I can try… Edited April 3, 2021 by JoaMat Quote Link to comment Share on other sites More sharing options...
Pars Posted April 3, 2021 Report Share Posted April 3, 2021 I don't know from a gerber perspective, but could you save the soldermask layer as an image file and invert that using a graphics program? 1 Quote Link to comment Share on other sites More sharing options...
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