electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » DIY Hardware and Software » Synthasystem
How do you tell the pin out on old transistors?
Post new topic   Reply to topic Moderators: dingebre
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Ricko



Joined: Dec 25, 2007
Posts: 251
Location: Sydney, Australia
Audio files: 27

PostPosted: Fri Dec 17, 2010 7:27 am    Post subject: How do you tell the pin out on old transistors? Reply with quote  Mark this post and the followings unread

Got around to putting in the last components in the Steiner VCF yesterday: the parts had just arrived from USA after the normal long postal delay.

But then...a mystery. My PN5138 and 2N5172 are not the normal TO-92 packages but are vintage ones: the former looking like water towers and the latter having a kind of skirt. So I am not at all sure of the orientation or even if they have the same pinout as the TO-92 packages which have datasheets. (The pins are in a triangle, not a straight line).

Does anyone know what I should do? (I tried the 5172 in various orientations in the HfE measurement socket on my multimeter, but didn't get anywhere.)

Cheers
Rick
Back to top
View user's profile Send private message Visit poster's website
RF



Joined: Mar 23, 2007
Posts: 1502
Location: Northern Minnesota, USA
Audio files: 28

PostPosted: Fri Dec 17, 2010 7:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Back in the day... (early 1970's) Smile If you looked at a transistor from the bottom, oriented the Base of the transistor south, the Emitter was East.
(Base is the one on the bottom of the V shape of the three leads.)
I used that with TO-5, TO-18 and TO-39 packages I think - maybe a few others...

I don't know how universal it is/was - but it worked for me back then.

_________________
www.sdiy.org/rfeng

"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963)
Back to top
View user's profile Send private message
dingebre



Joined: Aug 10, 2008
Posts: 270
Location: Salt Lake City, UT USA

PostPosted: Tue Dec 21, 2010 3:26 pm    Post subject: Re: How do you tell the pin out on old transistors? Reply with quote  Mark this post and the followings unread

Ricko wrote:
Got around to putting in the last components in the Steiner VCF yesterday: the parts had just arrived from USA after the normal long postal delay.

But then...a mystery. My PN5138 and 2N5172 are not the normal TO-92 packages but are vintage ones: the former looking like water towers and the latter having a kind of skirt. So I am not at all sure of the orientation or even if they have the same pinout as the TO-92 packages which have datasheets. (The pins are in a triangle, not a straight line).

Does anyone know what I should do? (I tried the 5172 in various orientations in the HfE measurement socket on my multimeter, but didn't get anywhere.)

Cheers
Rick


The 2N5172 has an BCE pinout (top view, flat away) and will install in the PCB by lining up the flat as indicated on the PCB. If you are using them in the spots labeled for the SSM2210s, you will have to twist the leads to get them installed, use one of the discrete transistor silkscreen as a guide.

For the 2N5138s, Ill double check my stock when I get home, but looking at the top of the transistor with the base of the triangle away from you, the pin on the left is the emitter, middle base, right collector. (I had it backwards earlier...)

see attached photo and this page on the website:

http://www.xmission.com/~dingebre/Transistor_photos.html

This is one of an old 2N5138 which I bought in 1974.

I'll try to post a couple of photos tonight.

David


IMAG0073_resize.jpg
 Description:
2N5138
 Filesize:  215.81 KB
 Viewed:  856 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

IMAG0073_resize.jpg



_________________
David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.

dingebre@3dphysics.net
http://www.xmission.com/~dingebre/Synthasystem.html
Back to top
View user's profile Send private message
Ricko



Joined: Dec 25, 2007
Posts: 251
Location: Sydney, Australia
Audio files: 27

PostPosted: Wed Dec 22, 2010 6:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Brilliant! Thanks so much for that

Rick
Back to top
View user's profile Send private message Visit poster's website
RF



Joined: Mar 23, 2007
Posts: 1502
Location: Northern Minnesota, USA
Audio files: 28

PostPosted: Wed Dec 22, 2010 7:43 am    Post subject: Reply with quote  Mark this post and the followings unread

...base is south...emitter is east. Go figure Wink
_________________
www.sdiy.org/rfeng

"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963)
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: dingebre
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » Synthasystem
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use