transistor sockets - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th July 2008, 10:42 AM   #1
diyAudio Member
 
Join Date: Feb 2008
Default transistor sockets

So, I've got it into my head to put together an "Umble" pedal for my guitar. I'd like to put the J201 transistors in sockets, but I can't seem to find any TO-92 sockets at Digikey or Mouser (or anywhere else really). Does anyone know where I can find some? Am I looking for the wrong thing; do people use something else as sockets for these things?
  Reply With Quote
Old 10th July 2008, 11:05 AM   #2
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Basically people haven't used transistor sockets for many decades, and for a guitar pedal it would be a VERY bad idea.
__________________
Nigel Goodwin
  Reply With Quote
Old 10th July 2008, 12:53 PM   #3
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
AllElectronics has them.

http://www.allelectronics.com/make-a...OCKET/-/1.html
  Reply With Quote
Old 10th July 2008, 02:54 PM   #4
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally posted by Nigel Goodwin
Basically people haven't used transistor sockets for many decades, and for a guitar pedal it would be a VERY bad idea.
Really? I'm a complete noob here. Why would it be a very bad idea? I read somewhere that the transistors can/will fail eventually and so putting them in sockets is a good idea. What's the disadvantage?

Thanks for the advice!
  Reply With Quote
Old 10th July 2008, 03:11 PM   #5
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
Transistors in a properly designed circuit should have a very long lifetime, probably longer than ours. Sockets reduce reliability- they can oxidize and the parts can vibrate free. They reduce high frequency performance. Commercial equipment almost never uses sockets, and not for cost reasons. OTOH, I've been known to use the nice Augat Teflon sockets for front end transistors where the frequencies are low and I want to play with careful matching. I've also been known to cut off a strip of 3 machined contact sockets from a break-away strip, and use them for TO-92 devices. I have a radio where static can blow the input device, and I keep that in a socket for easy replacement. I wouldn't say nobody ever uses sockets, but it's less and less common, especially since SMT is taking over everything anyway.

BTW, it's little known, but gold sockets are a waste of time unless you have gold leads. High pressure tin leaf types are best for tin IC leads.
__________________
I may be barking up the wrong tree, but at least I'm barking!
  Reply With Quote
Old 10th July 2008, 03:51 PM   #6
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Conrad -- good idea on the snippable machined sockets -- I use them when matching resistors for gain stages. DK carries them.
  Reply With Quote
Old 10th July 2008, 06:43 PM   #7
diyAudio Member
 
Join Date: Feb 2008
I'll take a look at the break-away sockets, but probably just solder the jfets directly to the circuit board.

Thanks for the advice, that's a big help.
  Reply With Quote
Old 10th July 2008, 07:26 PM   #8
teemuk is offline teemuk  Finland
diyAudio Member
 
Join Date: Nov 2004
Location: Suomi, Finland
Just buy a 6-pin DIL and split it in half: Two transistors sockets.
  Reply With Quote
Old 12th July 2008, 07:45 PM   #9
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally posted by sneakers563


Really? I'm a complete noob here. Why would it be a very bad idea? I read somewhere that the transistors can/will fail eventually and so putting them in sockets is a good idea. What's the disadvantage?
Sorry for the slow reply, but basically what others have said.

The transistor socket is going to be a LOT less reliable than the transistor that's plugged in it - it's adding an unreliable part to a part which will most probably last longer than you need it to. Transistors are VERY, VERY reliable - small signal ones as used in an effect pedal will almost never fail.

When transistors do fail, it's usually because something nasty has been done to them - like plugging too many speakers on the output of an amplifier.

An effect pedal is a device that gets a LOT of abuse, thrown around, dropped, all this is going to make the transistor work loose from the socket and cause problems.
__________________
Nigel Goodwin
  Reply With Quote
Old 13th July 2008, 07:30 PM   #10
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
The reason why DIY Pedal builders use sockets in there pedals is so they can easilly change out different Transistors for getting a different sound and/or to mod the pedal.... Many Pedal builders do this.....And if they find a transistor they like then they have the option of Soldering them to the board....

What I use for transistor sockets are regular DIP opamp sockets and I just cut them down with a Pair of Nail clippers so there are 3 Pins in a row...

Cheers

PS: With that Curcuit , it would be a good Idea to use Sockets at first, at least till you get the Pedal working properly..why?? Because that curcuit uses JFets (J201) which are nortorious for haveing wide rangeing specs which can make curtain Fets practicly un-Biasable so you might have to try several fets before you can get the curcuit working optimally.... (I had to try about 20 J201 fets to get 4 that would Bias correctly in my DR.Boogie build)...

  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tube sockets 56oval Tubes / Valves 17 7th August 2014 05:09 PM
Can bias transistor mount on top(body) of output transistor?? Leolabs Solid State 23 16th February 2008 01:35 AM
DAC on 16 pin DIP sockets dip16dac Digital Source 1 19th May 2004 02:10 AM
WTB UX5 sockets bcherry Swap Meet 0 1st March 2003 03:24 PM
RCA sockets carlmart Parts 8 31st January 2003 11:21 PM


New To Site? Need Help?

All times are GMT. The time now is 04:48 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2