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
  Twyndyllyngs Live Chez Mosc

poster

Please visit the chat
 Forum index » DIY Hardware and Software » fonik's place
555 VCO not sounding
Post new topic   Reply to topic Moderators: fonik
Page 1 of 1 [3 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
MapacheRaper



Joined: Feb 15, 2018
Posts: 117
Location: Spain

PostPosted: Fri Sep 21, 2018 9:35 pm    Post subject: 555 VCO not sounding Reply with quote  Mark this post and the followings unread

Hi guys, I have built this sexy thing but Im getting no sound...

Is there any guide or table of pin/voltages for troubleshooting this?


IMG_20180918_014904.jpg
 Description:
 Filesize:  178.67 KB
 Viewed:  53 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

IMG_20180918_014904.jpg



IMG_20180918_015038.jpg
 Description:
 Filesize:  262.08 KB
 Viewed:  59 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

IMG_20180918_015038.jpg



IMG_20180918_015052.jpg
 Description:
 Filesize:  315.48 KB
 Viewed:  60 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

IMG_20180918_015052.jpg



IMG_20180918_015128.jpg
 Description:
 Filesize:  209.98 KB
 Viewed:  50 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

IMG_20180918_015128.jpg


Back to top
View user's profile Send private message
comrade_zero



Joined: Mar 05, 2009
Posts: 64
Location: arizona
Audio files: 4

PostPosted: Wed Dec 05, 2018 4:27 am    Post subject: Reply with quote  Mark this post and the followings unread

You have omitted the (tempco ) resistor that fits over the exponential transistors. You can use a normal resistor here if you do not have a tempco, (but you will drift out of tune more quickly) but the vco will not sound without a resistor there. It's been a while since I built my board, but it is either 1k or 2k... You may want to look over your soldering in general, it looks a bit rough in some spots.
Good luck, and I hope this helps.
c_z
Back to top
View user's profile Send private message
MapacheRaper



Joined: Feb 15, 2018
Posts: 117
Location: Spain

PostPosted: Wed Dec 05, 2018 8:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Hawk eyes, no doubth.

Yeah, I forgot to put the tempco. I found it and solder it some days after posting this thread, but I forgot to say it. The OSC is working nicely since then.

Thank you so much for taking the time to sherlock holms it Wink
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: fonik
Page 1 of 1 [3 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 » fonik's place
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