Go Back   EcoModder Forum > Off-Topic > The Lounge
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-29-2020, 05:41 AM   #1 (permalink)
Master EcoModder
 
Join Date: Nov 2017
Location: Australia
Posts: 710
Thanks: 49
Thanked 700 Times in 431 Posts
My new home office audio amplifier

It's been about 5 years since I put together an audio amplifier. This one needed to be built into a salvaged case - also used the original heatsinks plus power switch, etc.
  • 200W mono LM3886 BTL amplifier boards x 2
  • 40,000F capacitance, 35A rectifier power supply module x 2
  • 300VA, 25-0-25V toroidal transformer x 2

Original salvaged amp (kept blowing internal fuses):



New amp:



Heatsinking of rectifier and outputs:



Working hard:



Happy with it - plenty of power, low noise, low distortion.

__________________
Modifying the Aerodynamics of Your Road Car

"The best practical introduction to aerodynamics for the car enthusiast that I've seen. The author combines his own experience with published research to provide useful and reliable insights into the often bewildering world of automotive aerodynamics."

- Adrian Gaylard, head of aerodynamics, Jaguar Land Rover
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-29-2020, 02:12 PM   #2 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 16,583
Thanks: 4,379
Thanked 5,587 Times in 4,450 Posts
Nice work. I keep looking for a stand-alone stereo amp to replace the self-powered desktop speakers I'm using now. All I find in the second hand shops is receivers and karaoke machines.

Was the original salvaged amp home-brew or commercial? Red paint or powder coat?
__________________
.

Change my, you know, the thing.

_________________
  Reply With Quote
Old 08-29-2020, 05:04 PM   #3 (permalink)
Master EcoModder
 
Join Date: Nov 2017
Location: Australia
Posts: 710
Thanks: 49
Thanked 700 Times in 431 Posts
Quote:
Originally Posted by freebeard View Post
Nice work. I keep looking for a stand-alone stereo amp to replace the self-powered desktop speakers I'm using now. All I find in the second hand shops is receivers and karaoke machines.

Was the original salvaged amp home-brew or commercial? Red paint or powder coat?
Thanks. Just paint - this is a budget project. The salvaged amp was an Australian-built (so probably small quantities) commercial PA amp.

If you want just a small amp, cheapest now is to buy a prebuilt board from somewhere like Banggood and power it from a plug-pack (wall wart) eg https://www.banggood.com/15W-TDA7297...r_warehouse=CN Just add a better heatsink and a box. They have a big variety at various pricing.

__________________
Modifying the Aerodynamics of Your Road Car

"The best practical introduction to aerodynamics for the car enthusiast that I've seen. The author combines his own experience with published research to provide useful and reliable insights into the often bewildering world of automotive aerodynamics."

- Adrian Gaylard, head of aerodynamics, Jaguar Land Rover
  Reply With Quote
The Following User Says Thank You to JulianEdgar For This Useful Post:
freebeard (08-29-2020)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com