Mukhalled Posted January 26, 2005 Report Share Posted January 26, 2005 HiI've built this amp:http://www.electronics-lab.com/projects/audio/006/index.htmlHow can I do to lower/ raise the volume? Will I use a potentiometer? 50k ohm maybe?? ???And you know the amp has two outputs so how can I control the volume by one potentiometer?Please help ;DBest wishesMukhalled Quote Link to comment Share on other sites More sharing options...
ante Posted January 26, 2005 Report Share Posted January 26, 2005 Hi,You need a preamplifier to control the volume. Quote Link to comment Share on other sites More sharing options...
Mukhalled Posted January 26, 2005 Author Report Share Posted January 26, 2005 aha , but is there any other way to do that? :( Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted January 26, 2005 Report Share Posted January 26, 2005 This is the circuit I was looking for when I posted under the negative charge pump. My circuit was to generate the negative supply from the 0 and 12. I was going to use this to generate an AC for the speaker. Audioguru led me to believe the circuit could not be accomplished for lack of power. It is obvious that this chip only delivers 0 and 12 to the speakers. I think we can do better. The only drawback is that the negative charge pump supply has limited current capability. You know I knew there was a simple solution to this. You see we can make the circuit better and more readily attainable with a charge pump supply and a simple pushpull output. Maybe I can post the circuit. Boy these capacitors are going to be a bit hefty but easy to get. Quote Link to comment Share on other sites More sharing options...
Mukhalled Posted January 26, 2005 Author Report Share Posted January 26, 2005 Hi Kevinyour curcuit is really interesting and seems good actually ;).Can you find a simple solution to my problem about the volume control? :) Quote Link to comment Share on other sites More sharing options...
MP Posted January 27, 2005 Report Share Posted January 27, 2005 Ante has given you good advice. I cannot imagine the tone is very good with this amp, either. A preamp will give you tone control and volume control. This circuit is not a good stand alone circuit. You might be able to add a pot to the front end, but this depends upon what you have connected to the input. My recommendation is to add a simple preamp circuit to the input.MP Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 27, 2005 Report Share Posted January 27, 2005 Kevin,This is a bridged amplifier that uses 2 amps per speaker to give nearly 24V p-p. If it wasn't bridged it could provide only 4W into a 4 ohm speaker at low distortion. But since it is bridged, it provides 16W at low distortion into 4 ohms, or even 22W with high distortion and a 14.4V supply.In addition, this IC is a stereo amp with two 22W channels, for a 44W total output, without using a charge-pump supply voltage doubler.Its maximum supply voltage is 18V so you can't use a supply voltage doubler with it anyway. But if you could operate it at 28.8V, its output power would be 176W and its supply current would be about 9.2A. Quote Link to comment Share on other sites More sharing options...
Mukhalled Posted January 27, 2005 Author Report Share Posted January 27, 2005 Hi againWhat do you think about this curcuit:-http://www.electronics-lab.com/projects/audio/039/index.htmlCan I couple it with this amp:http://www.electronics-lab.com/projects/audio/006/index.htmlto control the volume, bass, treble and balance? :)I was so happy when I hade built this amp and I will be happier to build the control curcuit for it. ;DCan anyone help me please Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 27, 2005 Report Share Posted January 27, 2005 Hi Mukhalled,That excellent quality preamp is a good one for your amp project.I hope your audio source has enough output for it because it doesn't have any gain (except for bass and treble boost).It also has an input limit of 1V RMS, so if your audio source has too much output, it will need attenuation. ;D Quote Link to comment Share on other sites More sharing options...
Mukhalled Posted January 27, 2005 Author Report Share Posted January 27, 2005 Hi Audioguru and thank you so much for helping me ;DI'll build it ;)Best wishes Quote Link to comment Share on other sites More sharing options...
login
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.