Shielded Enclosure vs. Not - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 18th May 2008, 03:35 PM   #1
ZenCow is offline ZenCow  United States
diyAudio Member
Join Date: Jan 2006
Location: Denver
Default Shielded Enclosure vs. Not

With regard to a chip amp and torroids,
and more generally to other components like perhaps a DAC powered by a torroid,

What are the cons involved in putting the unit in an enclosure that is not completely metal? For example say a metal enclosure with a clear top (to show the electronics), or maybe a completely plastic enclosure? Or wood? Etc.?

I ask this because many years ago the first project I did was a headphone amp and I "debugged" it for about 3 weeks on the benchtop because it had a slight buzzing sound. Then I got the bright idea to test it inside an enclosure and the buzzing went away.
  Reply With Quote
Old 18th May 2008, 05:48 PM   #2
diyAudio Member
Join Date: Nov 2004
Location: Florida
The cons are more sensitivity to external noise pickup. The *grounded* metal enclosure acts like the shield to ground all the noise before it reaches the amp.

However, you don't HAVE to use metal, but you can if you like. You can also use lots of other materials! If the amp is built well, it should not pick up a lot of noise anyway, metal case or not.

I built a 350W DIY subwoofer amp with a Wooden Enclosure.
I used thin wood for the frame, and gray-blue paneling for the sides, bottom and top, and an extra piece inside on the bottom to mount the PCB, transformer, and other components, which is removable with a few screws if it ever needs repair. It even has six fans, and I get no problems with noise or hum.

I've even seen plexiglass enclosures! You could even look at a few wild computer cases to get a few ideas, or even use a computer case like Forum Member MJL21193 did for his amp.
  Reply With Quote
Old 18th May 2008, 07:57 PM   #3
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
Nuuk's Avatar
Join Date: Feb 2003
Location: Somerset, SW England
I still can't decide on that one! I find items like active crossovers MUST have a shielded case but the GC's seem to be OK without. I also like the freedom you have when you don't have to use a metal enclosure!

Click the image to open in full size.
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 18th May 2008, 08:01 PM   #4
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
If the circuit has gain, bandwidth or susceptability to RF or other interference, it should be in a shielded case. IMO, that's about every circuit there is. OTOH, if you use the right filtering, and apply ground planes correctly, you might get away without, but there's no good reason to do so.
I may be barking up the wrong tree, but at least I'm barking!
  Reply With Quote


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
Shielded wire fsjonsey Tubes / Valves 7 21st March 2008 03:33 PM
Shielded inductors - where? Glenn2 Parts 6 29th October 2007 08:07 PM
shielded vs. non-shielded mytool4u Instruments and Amps 12 7th July 2005 10:12 PM
Design for SF W14 Shielded MTM Danse Multi-Way 0 15th October 2004 12:37 AM
shielded cables in enclosure MBK Solid State 25 16th March 2004 03:31 AM

New To Site? Need Help?

All times are GMT. The time now is 11:19 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2