Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Automatic Volume Control in software

Status
Not open for further replies.
D

DigitalDj

Newbie level 3
Joined
Jul 24, 2005
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,321
Automatic Volume Control

I am looking for a schematic for a Automatic Volume Control circuit that i can hook the audio output from the computer to a color organ circuit. Iwant to do this so as i change the volume the lighting effect doesn't change!

Can someone help me out?
Thanks,
Kevin
 

Re: Automatic Volume Control

Thanks!

1 question why do they have the - lead fron the U2 portion of the chip come up across the 100k resistor like they do?

Thanks,
Kevin
 

Re: Automatic Volume Control

This is the European symbol for a variable tapped resistor. This changes the gain of the operational amplifier circuit. Another symbol would be a zig zag line for the resistive portion and an arrow touching the zig zag for the variable tap.
 

    D

    DigitalDj

    Points: 2
    Helpful Answer Positive Rating
Re: Automatic Volume Control

Ok! just a potentiometer! I had never seen this symbol before.

Thanks for the help!
Kevin

Added after 11 minutes:

Ok! just a potentiometer! I had never seen this symbol before.

Thanks for the help!
Kevin

Added after 31 minutes:

Does anybody know if there is a direct replacement for this chip with just a single supply voltage instead of the split +/- supply?

Thanks,
Kevin
 

Re: Automatic Volume Control

For circuits like this you can use the popular LM358 dual-opamp, or other option will be LM324 (quad) and then you will replace all 3 opamps with this one.
Regards,
IanP
 

    D

    DigitalDj

    Points: 2
    Helpful Answer Positive Rating
Automatic Volume Control

u can use any variable gain amplifier and control its gain using peak detector of the output voltge.
 

Re: Automatic Volume Control

What do you mean peak detector?

Kevin
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top