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
  Jez Adventures in Sound
Please visit the chat
 Forum index » DIY Hardware and Software
Wogglebug #3 Schematic Question
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 1 [2 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
sine_wave



Joined: Sep 25, 2006
Posts: 20
Location: NY

PostPosted: Sun Oct 15, 2006 11:30 am    Post subject: Wogglebug #3 Schematic Question
Subject description: about Q1
Reply with quote  Mark this post and the followings unread

I've been checking out the CV In section of the Woggle Schematic. I'm a beginner so I have some questions. I understand how the pot(R9) interacts with the associated jack but I don't get what Q1 is doing. It looks like it is sending part of the voltage to ground and the other part to the vactrol. Can someone elaborate on that a little. What I need to understand is why it's there. The theory, etc....
Back to top
View user's profile Send private message
Scott Stites
Janitor
Janitor


Joined: Dec 23, 2005
Posts: 4121
Location: Mount Hope, KS USA
Audio files: 96

PostPosted: Sun Oct 15, 2006 12:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

As the base of Q1 becomes more positive, it conducts more current through it, through R20 to ground. The LEDs of both Vactrols are tied between +V and the collector of the transistor. The more current the transistor sucks through it, the brighter the internal LEDs of the Vactrols become. The brighter the LEDs, the less resistance the Vactrols' LDRs will have. So, more voltage at J3 and/or programmed with R9, the less resistance the LDRs have.

Cheers,
Scott
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 [2 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
mps board

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