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
  Rob Adventures in Sound
Please visit the chat
 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Photophonobservotron MK1
Post new topic   Reply to topic Moderators: mosc
Page 1 of 1 [8 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
JingleJoe



Joined: Nov 10, 2011
Posts: 876
Location: Lancashire, England
Audio files: 14

PostPosted: Sat Mar 24, 2012 3:29 pm    Post subject: Photophonobservotron MK1
Subject description: a photo-theremin and some notes about 4093 oscs and heterodyning
Reply with quote  Mark this post and the followings unread

This is a really simple device, only using a 4093 chip and some diodes, but it makes a hell of a lot of fun sounds Very Happy
The key is heterodyning via one of the NAND gates.
Previous sound machines I have seen made with with a 4093 chip use each oscillator to gate the next. This is good for a start however, using that method you miss out on a lot of interesting phasing and timbral effects. For example if a 4093 oscillator is gated with a higher frequency than it is oscillating at, then only the gate frequency gets through to the output. The gate must be less than half the frequency of the oscillator which it is gating in order for it to activate/de-activate the oscillator and still allow it a burst of pulses between off/low periods.

I found that (for me anyways) it's much more interesting to combine two oscillators via one of the other two-input NAND gates on the chip, just listen to the sample! There is much more spacey and rich sound than you get from a chain of oscillators gating each other.

The diodes in the schematic act as an OR gate and the oscillator connected via the switch is an LFO, but it also goes into the audio range. This arrangement is used to gate the signal from the central NAND gate, giving you the bleepy sounds you hear at the very start of the sound sample and intermittently throughout it aswell.

I'll get some photos of the finished device soon, I made it pretty Wink


photophonobservotronMK1.png
 Description:
The output stage is the pulldown resistor for the diode OR gate, it may be an idea to keep the volume pot below 100k, the resistor above the volume pot is to lower the voltage to optimize it for use with an amplifier expecting a very low voltage- like a g
 Filesize:  12.31 KB
 Viewed:  2104 Time(s)

photophonobservotronMK1.png



photophonobservotron MK1.mp3
 Description:
Gets really good around half way

Download
 Filename:  photophonobservotron MK1.mp3
 Filesize:  3.25 MB
 Downloaded:  198 Time(s)


_________________
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
JingleJoe



Joined: Nov 10, 2011
Posts: 876
Location: Lancashire, England
Audio files: 14

PostPosted: Sun Mar 25, 2012 4:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Photos!

EDIT: and videos!




DSCN0536.jpg
 Description:
 Filesize:  423.95 KB
 Viewed:  74 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

DSCN0536.jpg



_________________
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
tjookum



Joined: May 25, 2010
Posts: 353
Location: Netherlands
Audio files: 26

PostPosted: Sun Mar 25, 2012 2:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

nice one! Looks great and the sound is really impressive.
_________________
There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
Hunter S. Thompson
movies
noise
Back to top
View user's profile Send private message
JingleJoe



Joined: Nov 10, 2011
Posts: 876
Location: Lancashire, England
Audio files: 14

PostPosted: Mon Mar 26, 2012 10:05 am    Post subject: Reply with quote  Mark this post and the followings unread

And now it is for sale!
http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=150785909689

_________________
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
corex



Joined: Mar 02, 2010
Posts: 106
Location: Las Vegas

PostPosted: Mon Mar 26, 2012 10:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Sounds and looks nice, and the schema is simple too!

Are those test tubes? What's the glass over your LDRs?
Back to top
View user's profile Send private message
JingleJoe



Joined: Nov 10, 2011
Posts: 876
Location: Lancashire, England
Audio files: 14

PostPosted: Mon Mar 26, 2012 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Yup Smile I cut some test tubes in half with the hot-water bottle cutting method to construct those hyper-proximity field deflectors, preventing damage to the light sensors and looking snazzy too! Very Happy
_________________
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
corex



Joined: Mar 02, 2010
Posts: 106
Location: Las Vegas

PostPosted: Tue Mar 27, 2012 10:11 am    Post subject: Reply with quote  Mark this post and the followings unread

I have previously used these LED lenses but I think your test tubes look very nice!

And I just learned a new method to cut glass... thanks!
Back to top
View user's profile Send private message
JingleJoe



Joined: Nov 10, 2011
Posts: 876
Location: Lancashire, England
Audio files: 14

PostPosted: Tue Mar 27, 2012 10:19 am    Post subject: Reply with quote  Mark this post and the followings unread

SCIENCE! Very Happy

A note on construction of the LDR holders:
As backing I used card painted black and cut larger than the tube diameter, I made two small holes for the LDR leads, then hot glued the LDR in place.
In hindsight I would have liked to crimp the leads to the card with copper wire or staples as when soldering, the hot glue melts. As long as you do one lead at a time, with a delay to allow the glue to set again, then it works okay.
I glued the tubes in place at the back/inside side with a liberal amount of epoxy which allowed the LDRs mounted on card to be affixed by epoxy aswell.

_________________
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
Display posts from previous:   
Post new topic   Reply to topic Moderators: mosc
Page 1 of 1 [8 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
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