TA2020 MKIII Helder amp: increase gain how? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 7th September 2014, 09:41 AM   #1
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Default TA2020 MKIII Helder amp: increase gain how?

Seems Helder's store is closed???

I have this nice amp working but the gain is too low for connection with my PC (fine with desktop CD player). I like to increase the gain, so I can play louder in my small room, my speaker is 8Ohms 85db. Which part do I need to replace to what value?

What does DC gain adjustment do? (is this to increase gain?)

Sorry for the novice questions.
Attached Images
File Type: png mkIII.png (347.1 KB, 74 views)
__________________
--
Good sound from Davis, CA
  Reply With Quote
Old 7th September 2014, 01:02 PM   #2
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
Fiddling with the feedback in the amplifier will upset the working of it. Use a TL072 as a pre amp set with a gain of whatever you require.
__________________
www.flyingmole.co.uk For World Wide support for Flying Mole, Class D, Refurbishment and Repairs. www.jonsnell.co.uk
  Reply With Quote
Old 7th September 2014, 01:26 PM   #3
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Quote:
Originally Posted by JonSnell Electronic View Post
Fiddling with the feedback in the amplifier will upset the working of it. Use a TL072 as a pre amp set with a gain of whatever you require.
I am a novice with barely a soldering skill and this is likely not an option, thanks for your input.
__________________
--
Good sound from Davis, CA
  Reply With Quote
Old 8th September 2014, 05:08 PM   #4
t-head is offline t-head  United States
diyAudio Member
 
Join Date: Jul 2007
Location: Key Largo
gychang,

how are you connecting your pc to the amp?
__________________
trust, but verify...
  Reply With Quote
Old 8th September 2014, 06:10 PM   #5
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Quote:
Originally Posted by t-head View Post
gychang,

how are you connecting your pc to the amp?
analog audio output from motherboard to amp using 3.5mm cable.
__________________
--
Good sound from Davis, CA
  Reply With Quote
Old 8th September 2014, 06:20 PM   #6
t-head is offline t-head  United States
diyAudio Member
 
Join Date: Jul 2007
Location: Key Largo
You may be able to increase output of the pc. I am using Linux so cannot remember how to do that in windows. It is also possible to use an external DAC with full 2v output. I am using hifimediy 24/96 Sabre DAC dongle that outputs 2.2v. This will improve the output of the Helder 2020. It is probably possible to change resistors to increase output of 2020, but other problems could result ie. the least of them being to ruin the PCB traces, etc. I am using an amp board using the MAXIM 9744 chip that outputs 12-14 good watts into an 8 ohm load from a 12 volt supply (battery) and is supplied with output of the forementioned DAC dongle. My speakers are 8 ohm, 90 dB and I get all the volume I need. I noticed you have an old 2050 board from hifimediy. They may be able to help you with that if you contact them at HiFimeDIY Store. Ask at the forum or just use contact form...
__________________
trust, but verify...

Last edited by t-head; 8th September 2014 at 06:34 PM. Reason: added info
  Reply With Quote
Old 8th September 2014, 06:44 PM   #7
diyAudio Member
 
Join Date: May 2013
Increase feedback resistor or decrease input resistor
  Reply With Quote
Old 8th September 2014, 10:06 PM   #8
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
Yes, increase the volume output from your 3.5mm jack by checking the virtual mixer settings
__________________
www.flyingmole.co.uk For World Wide support for Flying Mole, Class D, Refurbishment and Repairs. www.jonsnell.co.uk
  Reply With Quote
Old 8th September 2014, 11:06 PM   #9
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Quote:
Originally Posted by t-head View Post
You may be able to increase output of the pc. I am using Linux so cannot remember how to do that in windows. It is also possible to use an external DAC with full 2v output. I am using hifimediy 24/96 Sabre DAC dongle that outputs 2.2v. This will improve the output of the Helder 2020. It is probably possible to change resistors to increase output of 2020, but other problems could result ie. the least of them being to ruin the PCB traces, etc. I am using an amp board using the MAXIM 9744 chip that outputs 12-14 good watts into an 8 ohm load from a 12 volt supply (battery) and is supplied with output of the forementioned DAC dongle. My speakers are 8 ohm, 90 dB and I get all the volume I need. I noticed you have an old 2050 board from hifimediy. They may be able to help you with that if you contact them at HiFimeDIY Store. Ask at the forum or just use contact form...
I use mainly manjaro linux, no windows, I do have a DAC somewhere and will try it to see if the volume increases. thanks for the input.
__________________
--
Good sound from Davis, CA
  Reply With Quote
Old 9th September 2014, 03:16 PM   #10
t-head is offline t-head  United States
diyAudio Member
 
Join Date: Jul 2007
Location: Key Largo
If using Linux, check your sound settings. You can increase the output of either your onboard sound card or external DAC. Too much increase can cause distortion, so be aware. Good Luck...
__________________
trust, but verify...
  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
Help! Just finished my Helder TA2020 MKIII and I'm getting buzzing CarbonCrew Class D 5 22nd January 2014 12:30 PM
Suggestions for Speakers for use with Helder TA2020 MKIII orrino Class D 0 16th August 2012 10:08 PM
Suggestions for Speakers for use with Helder TA2020 MKIII orrino Class D 0 16th August 2012 10:00 PM
Mods for Helder's TA2020 MKIII Amp Module kickngas Class D 7 4th July 2011 01:10 AM
Case for Helder's TA2020 MKIII Amp Module whaleman Class D 35 14th November 2010 01:42 AM


New To Site? Need Help?

All times are GMT. The time now is 05:04 AM.


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