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 » Lunettas - circuits inspired by Stanley Lunetta
First Lunetta Module - Advice Needed
Post new topic   Reply to topic Moderators: mosc
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
xiwi



Joined: Nov 29, 2012
Posts: 8
Location: nyc

PostPosted: Wed Jun 19, 2013 12:58 pm    Post subject: First Lunetta Module - Advice Needed Reply with quote  Mark this post and the followings unread

Hi there,

So, I'm about to embark a CMOS modular adventure and I could use some help.

I come from the design world and have limited knowledge of electronics, but am trying my best.

Here's the schematic of my 40106 Clock Generator...
Posted Image, might have been reduced in size. Click Image to view fullscreen.

There's nothing special going on here, but I'm not sure how to effectively incorporate LEDs. I found a schematic online for a LED drive that uses a 2N3904 NPN transistor and used it, but I have a sinking feeling that there might exist an IC that contains a couple NPN's that would better suit the project.

A) If I do end up using transistors, can I attach all of their bases to the point before 100k resistor or will I need a 100k resistor for each transistor I use.

B) My design will use 5 LEDs. Is there an IC I could use instead of 5 Transistors?

C) I'm using a 30k resistor here to get a more user friendly range for when the 4.7uF cap is switched on.

D) I'm using the standard .1uF cap for the 40106. Should I attach it close to pin 7 (GND) or pin 14 (9V). Is the 1uF general cap even necessary if I have a power supply with some big caps on it?

Just in case anyone's interested, here's the prototype of the module. It looks a bit like a Doepfer module. I'm hoping to change the potentiometer graphic in the next design.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Thanks for your help![/list]
Back to top
View user's profile Send private message
-minus-



Joined: Oct 26, 2008
Posts: 761

Audio files: 13

PostPosted: Wed Jun 19, 2013 1:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Put the 0.1uF cap close to pin 14. Definitely put the 1uF cap there too. I used 100uF on my larger modules, but 10uF might have been sufficient.

My LEDS were super brights with a 20K resistor on them. I didn't bother with the transistors, but it's entirely up to you.

I like that panel! Very nice. How are you producing them?
Back to top
View user's profile Send private message
trav



Joined: Sep 11, 2012
Posts: 71
Location: Auckland
Audio files: 14

PostPosted: Thu Jun 20, 2013 3:30 am    Post subject: Re: First Lunetta Module - Advice Needed Reply with quote  Mark this post and the followings unread

xiwi wrote:
Is there an IC I can use instead of 5 Transistors?

You could use a hex non-inverting buffer IC like the 4010 or 4050.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: mosc
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 » 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