Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 21st April 2004, 04:54 AM   #1
Zemo is offline Zemo  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Right here
Default Want to build a crappy 50W max mono amp. ideas?

Hey guys, I want to build an amp to power this: http://www.partsexpress.com/pe/showd...number=299-028

I'd plan on going stereo in, mono out, and straight to this. It only need 50W of power at max, and it really doesn't have to sound good....it doesn't make sound!

What's the chiepest possible amp for this kind of thing?

Maybe skip the powersection and buy a wallwart that outputs maybe 20V DC?
  Reply With Quote
Old 21st April 2004, 05:11 AM   #2
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
Default Use a class B stage.

You could use a NPN/PNP power BJT pair running in class B or on the verge of Class AB ( base to base voltage of 1 volts or less).
Connect direct to the power amp output ( speaker leads ) and with split (+/-) supplies. A wall wart's voltage might drop rapidly , especially at LF , and produce hardly any power into the "bass shaker". Only hitch here is that you might not be able to set the level on the bass shaker independant of the volume level.
That can be arranged with some extra circuitry.
Cheers.
__________________
AM
  Reply With Quote
Old 21st April 2004, 05:17 AM   #3
Zemo is offline Zemo  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Right here


wow, that is probably very helpful....but about 95% of it is over my head....I understood this part:
Quote:
A wall wart's voltage might drop rapidly , especially at LF , and produce hardly any power into the "bass shaker".
Hope you wouldn't mind explaining a little more?

what is a NPN/PNP power BJT? what is class B? what is class A/B?

and yes, I'd need to be able to control the level independant of other variables.

schematic? detailed description? anything? thanks!
  Reply With Quote
Old 21st April 2004, 05:20 AM   #4
diyAudio Member
 
Join Date: Dec 2003
Location: Atlanta, GA, US
Send a message via ICQ to tpenguin Send a message via AIM to tpenguin Send a message via Yahoo to tpenguin
I would recommend an amp based on the LM3886, with cheap components used throughout. I would use the 48VCT 3A transformer PE sells, at least 2000uF per rail, and set the gain to your liking. I don't think clipping should be too much of a concern with a "tactile transducer," but I'm not really sure. I'd say for all the parts put together, you're looking at about $50. For cooling the chip, a passive heatsink from a slot-1 pentium 2 or 3 would work quite well if you can find one cheap or salvage it from an old computer.
  Reply With Quote
Old 21st April 2004, 06:14 AM   #5
r0cket- is offline r0cket-  United States
diyAudio Member
 
Join Date: Aug 2003
Location: Portland, OR
Default Re: Want to build a crappy 50W max mono amp. ideas?

Quote:
Originally posted by Zemo
What's the chiepest possible amp for this kind of thing?
Well, not to step on your DIY bug, but you'd probably be better off just finding an old receiver at someone's garage sale for $5 and using that.
  Reply With Quote
Old 22nd April 2004, 03:25 PM   #6
meat is offline meat  United States
diyAudio Member
 
Join Date: Jan 2004
Location: AZ
BJT is a bi-polar transistor.

NPN/PNP refers to the type of transistor it is or how the transistor behaves.

better description

web site explaining different classes of amps
  Reply With Quote
Old 22nd April 2004, 03:34 PM   #7
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Maybe a Gainclone amp built by LM3886, 68 watts out.

What is your budget?
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
  Reply With Quote
Old 22nd April 2004, 09:57 PM   #8
diyAudio Member
 
Hybrid fourdoor's Avatar
 
Join Date: May 2003
Location: Ft. Worth, TX
Default Re: Re: Want to build a crappy 50W max mono amp. ideas?

Quote:
Originally posted by r0cket-

Well, not to step on your DIY bug, but you'd probably be better off just finding an old receiver at someone's garage sale for $5 and using that.
The only problem with this is that not many recievers (old at that) have a "Main Amp In". I suppose that plugging the Preamp out into say, CD, might work, but you may clip the reciever if the input level gets too high. Adding a resistor could lower the input level, then just turn the volume up (on the shaker reciever) to compansate.
__________________
I enjoy my organic shapes.....
  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
Avalon / Soup Build Ideas soundengine355 Multi-Way 1 29th August 2008 07:40 PM
HT Subwoofer build ideas/question MikeCamp Subwoofers 2 29th February 2008 04:13 PM
What would you build for mono music? renfrow Full Range 6 21st November 2006 04:00 AM
Want to build mono blocks, quick question. Zemo Chip Amps 11 21st April 2004 07:48 AM


New To Site? Need Help?

All times are GMT. The time now is 03:18 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