Complementary JFET pairs in the UK? - diyAudio
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Old 31st December 2004, 06:15 PM   #1
Mr Evil is offline Mr Evil  United Kingdom
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Default Complementary JFET pairs in the UK?

I like using FETs of all kinds and I also like building symmetrical things. Thus a problem that plagues me is that finding complementary pairs of JFETs is difficult. First it's hard to find what component is a complement to another, since very few specify a complement in the datasheet. Secondly, even if I do find a suitable pair, it's very unusual to be able to actually purchase them at the usual places of RS and Farnell.

Does anyone here know of a reliable supplier who stocks JFETs?
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Old 1st January 2005, 07:10 AM   #2
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For your neighborhood your best bet may be Borbely's web site.
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Old 2nd January 2005, 02:16 PM   #3
Mr Evil is offline Mr Evil  United Kingdom
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Thanks. I see they match FETs too, which is nice. However they don't have online ordering, which is inconvenient.

BTW, here's a link to Borbely Audio, in case any Google-challenged individuals read this thread
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Old 2nd January 2005, 02:37 PM   #4
SY is offline SY  United States
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Matching FETs is quite easy. Just set up a jig to simulate the desired operating point and use a voltmeter. This will be better than relying on someone else's matching procedure which may or may not be suitable for your application.

And generally, FETs are cheap enough to overbuy. If I need two matched sets, I'll buy 20 or 30 FETs, and end up with a few matched sets plus some overage to use in less critical spots (like followers).
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Old 12th January 2005, 01:32 AM   #5
VS is offline VS  Portugal
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Hi ! Since you are in the UK, I supose , why don't you try
www.grandata.co.uk ?
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Old 6th January 2007, 08:39 PM   #6
mr.duck is offline mr.duck  United Kingdom
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I'm also looking for complementary JFETs in TO-92 package for input to amplifier. I've seen an amp that uses J105 and J106. Not sure if these devices are best for good results. Any comments? Are there any specs I should pay close attention to when choosing devices? Amplifier I am building does not use global negative feedback at all. So device selection is probably more sensitive. Any advice?
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Old 6th January 2007, 10:32 PM   #7
mr.duck is offline mr.duck  United Kingdom
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I think I made a mistake. J105 and J106 are not complementary N and P channel devices. BTW isn't it possible to edit previous posts?
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