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
  PHANToS presents: Ghouls & Ghosts (various EM Halloween performances from previous years)
  PHANToS presents: The Monstrous Modulator (Modulator ESP's 2010/2011 halloween performances mix)
Please visit the chat
 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Q7 question....
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [7 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
The Big Ear



Joined: Jul 03, 2005
Posts: 14
Location: belgium

PostPosted: Thu Nov 03, 2005 12:37 pm    Post subject: Q7 question.... Reply with quote  Mark this post and the followings unread

I'm wondering about Q7....
According to the datascheet of a 2N3904 I have to cut pin 1 (collector).
But that would mean the drawing on the PCB is incorrect.
Or am I just being stupid Wink

http://pdf.alldatasheet.com/datasheet-pdf/view/15077/PHILIPS/2N3904.html

_________________
--
The Big Ear
www.thebigear.be
Back to top
View user's profile Send private message Visit poster's website
Wild Zebra



Joined: Apr 28, 2005
Posts: 806
Location: Ohio
Audio files: 5

PostPosted: Thu Nov 03, 2005 1:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Not too sure what you mean about the PCB being wrong. Correct, you cut off the collector. Just socket Q7 try a bunch of 2n3904's til you find the noisiest or the noise you like and then cut off the collector. That simple.
Last edited by Wild Zebra on Thu Nov 03, 2005 1:32 pm; edited 1 time in total
Back to top
View user's profile Send private message
The Big Ear



Joined: Jul 03, 2005
Posts: 14
Location: belgium

PostPosted: Thu Nov 03, 2005 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

[quote="Wild Zebra"]Not too sure what you mean about the PCB being [/quote]

Wondering if the symbol is wrong on the PCB.....
I'll try the socketing thingie...

cheers,

_________________
--
The Big Ear
www.thebigear.be
Back to top
View user's profile Send private message Visit poster's website
Uncle Krunkus
Moderator


Joined: Jul 11, 2005
Posts: 4760
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1

PostPosted: Thu Nov 03, 2005 4:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

On the PCB layout, beneath the Q7 outline you can see a track which is making it's way to R49. But it's not a third pad for Q7. The only two pads under the Q7 outline have a little spot which means they need to be drilled and will have Q7's Base and Emitter soldered there.
_________________
What makes a space ours, is what we put there, and what we do there.
Back to top
View user's profile Send private message Visit poster's website
ladislaobiro



Joined: Mar 24, 2005
Posts: 105
Location: Italy

PostPosted: Fri Nov 04, 2005 12:28 am    Post subject: Reply with quote  Mark this post and the followings unread

The Big Ear wrote:
Wondering if the symbol is wrong on the PCB.....

Hi The Big Ear (btw, nice nickname Very Happy), and welcome to electro-music...

No, the simbol on the PCB for Q7 is definitely right.
If you look at the second page of the spec sheet that you've linked, you will find the pinout of the trasistor.
Remember that usually a transistor pinout refers to the transistor seen from the bottom to the top: you have to look the legs' side...
Do this and you will see that the PCB symbol does make sense.
bye...
ladislao
Back to top
View user's profile Send private message
The Big Ear



Joined: Jul 03, 2005
Posts: 14
Location: belgium

PostPosted: Fri Nov 04, 2005 9:58 am    Post subject: Reply with quote  Mark this post and the followings unread

[quote="ladislaobiro"]
Hi The Big Ear (btw, nice nickname Very Happy), and welcome to electro-music...

No, the simbol on the PCB for Q7 is definitely right.
If you look at the second page of the spec sheet that you've linked, you will find the pinout of the trasistor.
Remember that usually a transistor pinout refers to the transistor seen from the bottom to the top: you have to look the legs' side...
Do this and you will see that the PCB symbol does make sense.
bye...
ladislao[/quote]

Thanks, I see it now, must be the herbs getting in the way Wink

Cheers,

_________________
--
The Big Ear
www.thebigear.be
Back to top
View user's profile Send private message Visit poster's website
mosc
Site Admin


Joined: Jan 31, 2003
Posts: 17618
Location: Allentown, PA
Audio files: 125
G2 patch files: 60

PostPosted: Fri Nov 04, 2005 10:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Welcome, Big Ear.

I think you have your profile set up not to show BBCODES. That's generally not too useful. That's why your quotes aren't showing up. You can set it using the profile menu at the upper right of any forum page.

Cheers...

_________________
--Howard
my music and other stuff
Back to top
View user's profile Send private message Send e-mail Visit poster's website AIM Address
Display posts from previous:   
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [7 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 » MusicFromOuterSpace.com designs by Ray Wilson
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