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 10th December 2012, 07:53 PM   #21
diyAudio Member
 
Join Date: Dec 2012
I used your recommended NE5532 for the op amp.
I am so excited right now.
  Reply With Quote
Old 11th December 2012, 06:30 AM   #22
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
That's great well done

So whats next
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 12th December 2012, 01:35 AM   #23
diyAudio Member
 
Join Date: Dec 2012
Currently trying to add LEDs to pulse along with the output!
  Reply With Quote
Old 12th December 2012, 06:49 AM   #24
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
That's not as easy as it sounds, or more correctly, while its easy to get an LED to flash to the music, its less easy for it to be useful and meaningful.

Understand the problems and you'll see why.

Music has lots of transient peaks. So you decide you want an LED to light at a given level. Thats a problem because the transient nature of the signal means the light from the LED is transient too. In other words dim brief flashes when the signal exceeds some value.

What is nedded is a circuit to rectify the signal (so that peaks above and below "zero" are registered and treated equally and a circuit to add a time constant so that the peaks are "held".

Now all that can be done with a couple of opamps for one LED.

What I recommend is you consider a circuit based on the LM3914 series of chips.

Here's a great on-line resource for data sheets for 99% of the devices you'll ever need,
Datasheet catalog for integrated circuits, diodes, triacs, and other semiconductors, view

Look up LM3914, LM3915, and LM3916

If you look down the data sheet you'll see how the circuit is comprised of a chain of opamps each with a different fixed reference voltage on one input and the variable audio on the other.

Each opamp configured like that forms a "Window comparator"
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  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
mixer circuits (looking for simple, but very high quality)... dfeweer Analog Line Level 6 21st December 2011 09:58 PM
Explanation of superiority of Linux for audio? mr_push_pull PC Based 2 3rd December 2011 07:24 PM
Mixer Section explanation help needed. graygem Analog Line Level 1 12th May 2011 04:56 PM
mixer circuits jonathanmatenga Multi-Way 1 9th August 2007 07:01 PM
request for an explanation of "Q" jaygeorge1979 Multi-Way 11 19th January 2006 06:56 AM


New To Site? Need Help?

All times are GMT. The time now is 08:41 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