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 
 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
drone machine with adapted soundlab circuits
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Mon Jul 18, 2011 11:57 pm    Post subject: drone machine with adapted soundlab circuits Reply with quote  Mark this post and the followings unread

I'm building a cmos based drone machine with an adapted version of the soundlab mini synth filter.
It's basically 2 Oscillators with Pulsewidh control and 1 LFO + pseudo Attack-Release Envelope control build with a CD40106 chip. Nothing fancy so far.

But since I figured out, that it's easy to drive the SL-minisynth filter with only a single 9-volt batterie by building a virtuell ground, I had to include an adapted circuit.
It sounds DOPE now!! Fat bass and chorus like sounds + a sine-like wave when the resonance pot is turned all the way clockwards. The filter is gated by the AR-LFO from the CD40106 and sounds even better than the one from my original soundlab.

The next step would be to include the white noise source from the SL-minisynth.
But first I need some help:

My volume pot sounds grinding while I am turning it. But when the volume is fixed it's gone. Only while I am turning it it makes this noise. Also when I twist the switch, which selects between BP and LP Filter output. Though I think the switch shorts BP and LP and this could be the problem.

I didnt use a decoupling capacitor on the output of the circuit, because it seems that it would filter the sound again. No matter which value I tried.
May this be the problem?
Back to top
View user's profile Send private message
inlifeindeath



Joined: Apr 02, 2010
Posts: 315
Location: Albuquerque, NM

PostPosted: Tue Jul 19, 2011 5:55 am    Post subject: Reply with quote  Mark this post and the followings unread

sounds like you have DC across the pot
_________________
http://www.youtube.com/user/borisandfef
Back to top
View user's profile Send private message Visit poster's website
synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Tue Jul 19, 2011 9:44 am    Post subject: Reply with quote  Mark this post and the followings unread

DC across the volume pot. hmh.....that's not good.
So a nonpolarized capacitor should help. But it filters the output signal with every value that I tried so far.
I'm gonna make some trial 'n' error before I break my head.

thanks
I'll let you know if I figure out something new.
Back to top
View user's profile Send private message
synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Tue Jul 19, 2011 12:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

yes! I got it.
The capacitor value that I tried to use for decoupling was actually o.k.
It wasnt filtering the output sound, but the sound gets distorted easier. So I needed a 47k resistor. Now the capacitors dont affect the output anymore and the volume pot doesnt grind anymore.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [4 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