Help using Simple PCV fader as a sound kutter (VCA?) - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd September 2005, 12:30 PM   #1
diyAudio Member
 
Join Date: Sep 2005
Lightbulb Help using Simple PCV fader as a sound kutter (VCA?)

I want to use a PCV Vestax fader as an audio kutter inline with an audio signal. I tried hoking the audio up through it and it it has a very gradual fade. I need it to be as sharp as possible. I want it to be at full volume as close to the edge of the throw *** possible (1-2mm away from off).

So, Im thinking I need to use a VCA to achieve this effect (I can then either tape over the carbon tracks or scrape them) or if im using an alternate optical "fader" that really only acts as a switch (Focus Fader V1 FFV.1)

I have attached pictures of both types of faders I could use. The PCV fader has had 2 of the 4 carbon tracks scraped to give a sharp kutt in for 1 channel (vestax 05pro2 VCA mixer)

focus fader
Click the image to open in full size.

Vestax PCV fader
Click the image to open in full size.


I reverse engineered that focus fader and built my own PCB for it and used Optek Technologies OPB620 optical interrupters for the switches, however I can only use it in my mixer, and I want to use it just as a simple audio kutter... this birngs me to you guys, to see if you can exercise any genius on this one..

Below is the DIY optical fader PCV (of course thats just the electronics not the physical fader slide)

Click the image to open in full size.


Any and all help greatly apprecciated,
Mike
  Reply With Quote
Old 2nd September 2005, 11:42 PM   #2
diyAudio Member
 
Join Date: Sep 2005
is anybody even familiar with this type of thing?
  Reply With Quote
Old 11th February 2007, 08:24 AM   #3
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
I'm interested in it as well. You got a circuit?
  Reply With Quote
Old 11th February 2007, 08:24 AM   #4
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Alright I got it. This circuit gives you a two changing voltages from phototransistors. And this is used to drive VCA's. Now I'm thinking how to make it together. Can you post a photo of VCA board here? Or tell me names of chips that is near cable coming from fader,
  Reply With Quote
Old 11th February 2007, 05:24 PM   #5
diyAudio Member
 
Join Date: Sep 2005
I figured it out, heres the circuit for anyone interested in building one.
You will need a fader with a 50k resistance... Or you can use the schematic I provided above to make your own optical "fader" switch

This is mainly for DJ use, but is a good thing to know.

heres the pic

Click the image to open in full size.


Many thanks to Elliot (Emarx) of AudioInnovate for posting this through the www.skratchlounge.com forum.... (mods sections)


  Reply With Quote
Old 12th February 2007, 06:43 AM   #6
YureZzZ is offline YureZzZ  Cyprus
diyAudio Member
 
Join Date: Feb 2007
Location: Cyprus
Send a message via ICQ to YureZzZ Send a message via AIM to YureZzZ Send a message via MSN to YureZzZ Send a message via Yahoo to YureZzZ
Quote:
Originally posted by Mike Reezy
Or you can use the schematic I provided above to make your own optical "fader" switch
So how do I connect here optical switch?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Here's a 20 watt amp, very simple but sound good gaetan8888 Solid State 68 6th March 2013 09:28 PM
Tubelab Simple SE Sound Quality TV Man Tubes / Valves 3 9th July 2009 07:23 PM
How to ID volume & fader pots? jol50 Car Audio 54 18th January 2008 05:26 AM
DIY Contactless Fader YureZzZ Analog Line Level 11 20th February 2007 10:46 PM
White led fader VoLCoM Parts 11 27th December 2003 09:52 PM


New To Site? Need Help?

All times are GMT. The time now is 02:55 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2