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
  Faux Pas Quartet and friends Music From Last Thursday
Please visit the chat
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Simple LFO schematic, opinions?
Post new topic   Reply to topic Moderators: mosc
Page 3 of 3 [52 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Goto page: Previous 1, 2, 3
Author Message
JingleJoe



Joined: Nov 10, 2011
Posts: 878
Location: Lancashire, England
Audio files: 14

PostPosted: Fri Dec 07, 2012 2:46 am    Post subject: Reply with quote  Mark this post and the followings unread

I don't know about RF (radio frequency) noise but there's allways the problem of induction- any two wires or pcb track running near one another can induce a current in one another so if you have any high currents flowing through wires, the larger current will create a greater electromagnetic field around the wire thus inducing a signal in nearby wires.
Reduce the current flowing to solve this.
Also that 100 ohm resistor sounds like a bad idea to me, I've never seen that done before, maybe a 10 ohm resistor to prevent direct shorts but 100 ohm in line with the chip? That'll just power starve the IC.

Try putting a nice big cap, something like 470u or 1000u accross the power supply Smile I have done that in the past to remove interference caused by 555 timers and other oscillators in high gain amplifiers (gain>1000) which were all on the same power supply.

_________________
As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"


Green Dungeon Alchemist Laboratories
Back to top
View user's profile Send private message
Rolbista



Joined: Nov 17, 2012
Posts: 21
Location: Poland

PostPosted: Fri Dec 07, 2012 8:36 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, i'll try that, one more thing, I'm currently using a switching transistor with an LED for a rate indicator, but could i just put an LED in parallel with whatever i'm modulating with the LFO? stick it on the output?

*EDIT* would it be a good idea to ground all the unused pins?
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: mosc
Page 3 of 3 [52 Posts]
View unread posts
View new posts in the last week
Goto page: Previous 1, 2, 3
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
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