electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
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 
Live streaming at radio.electro-music.com

  host / artist show at your time
  mosc Back on the air tonight - Twyndyllyngs
Please visit the chat
 Forum index » DIY Hardware and Software
Transistor Matcher P-N-P Layout (+ etched PCBs for sale)
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 1 [6 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
roman_f



Joined: Jul 03, 2007
Posts: 64
Location: Moscow
Audio files: 1

PostPosted: Sat Feb 04, 2012 9:18 am    Post subject: Transistor Matcher P-N-P Layout (+ etched PCBs for sale) Reply with quote  Mark this post and the followings unread

Using matched transistor pairs in a single IC is cool, but sometimes not cheap or easy to get them fast, that's why we can use a simple circuit for matching single transistors

I've made my own press-n-peel layout for that, using schematics from minimoog manual (I've found it on dragonfly alley, but guys do not offer the p-n-p solution):

Posted Image, might have been reduced in size. Click Image to view fullscreen.

it's very easy to assemble, requires no trimming, works for both PNP and NPN transistors

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

I've added sockets for transistors and screw terminal blocks for fixing the multimeter leads.

PDF for P-N-P, BOM and schematics is attached

if you can't do PNP by yourself - i can etch the board
price is $20 shipped worldwide, paypal is in@btwn.us


sputnik-tm-pnp.pdf
 Description:
Press-N-Peel layout

Download
 Filename:  sputnik-tm-pnp.pdf
 Filesize:  383.47 KB
 Downloaded:  184 Time(s)


tm-schem.pdf
 Description:
Schematics

Download
 Filename:  tm-schem.pdf
 Filesize:  115.44 KB
 Downloaded:  247 Time(s)


sputnik-tm-bom.pdf
 Description:
BOM

Download
 Filename:  sputnik-tm-bom.pdf
 Filesize:  17.11 KB
 Downloaded:  192 Time(s)

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



Joined: Oct 26, 2006
Posts: 177
Location: Lawrence, Kansas

PostPosted: Sat Feb 04, 2012 12:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very cool; thanks so much for sharing this!

Mark
Back to top
View user's profile Send private message
elmegil



Joined: Mar 20, 2012
Posts: 1506
Location: Chicago
Audio files: 14

PostPosted: Sun Apr 08, 2012 10:05 am    Post subject: Reply with quote  Mark this post and the followings unread

I breadboarded this circuit and both sides have an oscillation in the BE voltage, so I don't have anything static to measure. It doesn't seem to matter which way I hook the probes.

I haven't had a chance to troubleshoot very far yet, but if this sounds familiar and there's somewhere I should focus, I'd appreciate any pointers.

One thing that confuses me is having nothing but the probe hooked up to the base of the transistor being measured. Is that correct?
Back to top
View user's profile Send private message
frijitz



Joined: May 04, 2007
Posts: 1712
Location: NM USA
Audio files: 54

PostPosted: Mon Apr 09, 2012 7:59 am    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
I breadboarded this circuit and both sides have an oscillation in the BE voltage, so I don't have anything static to measure. It doesn't seem to matter which way I hook the probes.

I haven't had a chance to troubleshoot very far yet, but if this sounds familiar and there's somewhere I should focus, I'd appreciate any pointers.

One thing that confuses me is having nothing but the probe hooked up to the base of the transistor being measured. Is that correct?

Here's an alternative method:
http://home.comcast.net/~ijfritz/projects/transmat001.pdf

Ian
Back to top
View user's profile Send private message
elmegil



Joined: Mar 20, 2012
Posts: 1506
Location: Chicago
Audio files: 14

PostPosted: Thu Apr 12, 2012 7:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Ian... I've looked at that at some length and have figured that I can use a 4PDT on-off-on (criss cross the power and the diode) and a DPDT (criss cross the emitters) to work up the entire circuit for both NPN & PNP in a small project box, powered by 9V batteries. Possibly overkill Smile but will save a lot of switching around of parts, or a larger circuit board. I plan to use a trimmer too. Should be fun Smile.
Back to top
View user's profile Send private message
elmegil



Joined: Mar 20, 2012
Posts: 1506
Location: Chicago
Audio files: 14

PostPosted: Thu Apr 19, 2012 9:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

So here's what it looks like; not actually wired up on the inside or labelled, but planned in detail, and I wanted to laugh at myself for getting extremely oversized switches Smile
[/img]


transistor-matching.jpg
 Description:
 Filesize:  120.95 KB
 Viewed:  82 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

transistor-matching.jpg


Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 1 [6 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
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
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


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