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 Forum index » DIY Hardware and Software » YuSynth
j111/j112 replacement
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rubendelacosta



Joined: Dec 25, 2005
Posts: 151
Location: lisbon

PostPosted: Fri Jul 31, 2009 6:10 am    Post subject: j111/j112 replacement Reply with quote  Mark this post and the followings unread

hi there!

anyone knows a good replacement for this transistor(j111 or j112)?
the pinout doesn't have to match...

thanks,
ruben


EDIT: it's for the yusynth vco
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Fri Jul 31, 2009 5:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi:
I think 2N4391 or 2N4392 are good replacements, not sure about the pinout.

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vcfool



Joined: Jun 19, 2008
Posts: 23
Location: Barcelona

PostPosted: Sat Aug 01, 2009 5:35 am    Post subject: Reply with quote  Mark this post and the followings unread

I used a 2N5457 on my YuSynth VCO and it seems to work fine.
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yusynth



Joined: Nov 24, 2005
Posts: 1229
Location: France

PostPosted: Sat Aug 01, 2009 5:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
If you look for a replacement for J111 or J112, what is important is to check that the drain-source resistor value is smaller or equal to 60 ohms when in conductive (saturated) mode. It is referenced as Rds in datasheets.
I checked the datasheets of 2N4391 and 2N4392 and they are good substitutes with a preference for 2N4391

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rubendelacosta



Joined: Dec 25, 2005
Posts: 151
Location: lisbon

PostPosted: Sat Aug 01, 2009 6:40 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks a lot,
i'll check that out as soon as possible
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rubendelacosta



Joined: Dec 25, 2005
Posts: 151
Location: lisbon

PostPosted: Mon Aug 03, 2009 1:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

i found some BF244B and 2N3819, could they be a replacement?
the specs are a little different, but would it work for a while until i found the j112?

here are the datasheet:
http://www.fairchildsemi.com/ds/2N%2F2N3819.pdf
http://www.datasheetcatalog.org/datasheet/fairchild/BF244B.pdf

thanks,
ruben
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yusynth



Joined: Nov 24, 2005
Posts: 1229
Location: France

PostPosted: Mon Aug 03, 2009 1:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

No BF244 and 2N3819 are not to be used for the VCO, their Rds is much to high. It would be very difficult to obtain a good tracking over the high octaves ! It is very important that you use one of reference listed above : 2N4391 or 2N4392 or 2N5457. It must be FET specialized in switching task.
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