Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

Beginner Mod Guides?
Beginner Mod Guides?
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 22nd April 2016, 09:31 AM   #1
nearlygnarly is offline nearlygnarly  Japan
diyAudio Member
 
Join Date: Sep 2013
Talking Beginner Mod Guides?

I've never thought of modding an amp before and I've tried for a few days to search for beginner amp mods, to no avail. I don't want to post a series of annoying common place questions, so I thought I'd just ask for some reference guides to start me off. I have a few cheap ebay TDA7498s and TPA3116s coming in (hopefully non-DOA), I ordered multiples because I seriously question the build quality and I'd like to improve the amp life/durability and sound quality.

Any direction would be appreciated, I know I have a greater chance of destroying the amp than improving it, but I figured I'd give it a try.

For reference:
The TPA3116 Click the image to open in full size.
and

The TDA7498 Click the image to open in full size.
  Reply With Quote
Old 22nd April 2016, 11:47 AM   #2
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
Start here:

http://www.diyaudio.com/forums/class...ing-comes.html

3116-3118 same chip
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 22nd April 2016, 03:37 PM   #3
nearlygnarly is offline nearlygnarly  Japan
diyAudio Member
 
Join Date: Sep 2013
Thank you, going through the pages now.
  Reply With Quote
Old 22nd April 2016, 08:08 PM   #4
trashcanz is offline trashcanz  United States
diyAudio Member
 
Join Date: Jan 2016
I have modified the red board to a point that it sounds pretty good. I have started using it over my ADCOM GFA to save electricity. That thing is a heater when left on 24/7.

Here are the components I used for 8R speakers.

4 Panasonic 25SEPF330M
8 TDK FK20X7R2E224K
4 Bourns 2100HT-220-V-RC
4 Wima MKS4D036802E00KSSD
4 K331J15C0GF5TH5 + 4 ERG-1SJ100 for bootstrap snubber.
2 100kOhm 0603 Resistors + 2 20kOhm 0603 Resistors to change gain.

However, you should use SMT inductors like the Coilcraft MSS1260T Series instead of the through hole ones I used. They look very silly and performance suffers. Also, remove the 50k potentiometer or change it to 10k or lower logarithmic pot.
Attached Images
File Type: jpg 20160422_134007.jpg (1,005.0 KB, 147 views)
  Reply With Quote
Old 23rd April 2016, 01:10 AM   #5
nearlygnarly is offline nearlygnarly  Japan
diyAudio Member
 
Join Date: Sep 2013
Thank you, this is a great reference.
  Reply With Quote
Old 23rd April 2016, 09:21 AM   #6
skrstic is offline skrstic  Serbia
diyAudio Member
 
Join Date: Oct 2007
Location: Belgrade
TPA3116 Upgrades

trashcanz can You take a good image of bootstrap snubber?
  Reply With Quote
Old 23rd April 2016, 06:56 PM   #7
trashcanz is offline trashcanz  United States
diyAudio Member
 
Join Date: Jan 2016
This is the best picture I have of it without taking the amplifier back out. One side of the capacitor will connect to input pad of the inductors. Resistor will be connected to the capacitor. Other side of the resistor will be connected to the ground plane on the bottom in which you expose by scraping the mask off. Make the leads as short as possible, shorter than what I have.
Attached Images
File Type: jpg snubber.jpg (266.7 KB, 95 views)
  Reply With Quote
Old 23rd April 2016, 07:39 PM   #8
skrstic is offline skrstic  Serbia
diyAudio Member
 
Join Date: Oct 2007
Location: Belgrade
Default Bootstrap snubber

Thank's. It's OK.
  Reply With Quote

Reply


Beginner Mod Guides?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Construction Guides cpsmusic Construction Tips 1 4th May 2015 03:26 AM
Beginner needs help to mod a 4xTDA1543. Mario_JR Digital Source 7 15th February 2012 03:49 PM
Want to mod Marantz CD53 (beginner) Stabby Digital Source 9 29th September 2010 04:25 AM
crossover guides morfic Multi-Way 6 28th August 2009 10:32 PM
IC guides/beginner projects AndersJ Parts 8 8th October 2006 07:30 PM


New To Site? Need Help?

All times are GMT. The time now is 12:01 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki