My first designed amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 2nd September 2011, 04:25 PM   #1
diyAudio Member
Join Date: Feb 2011
Smile My first designed amp

Try it. Don't believe me.
I like its sound more than non inverting LM3875 and inverting LM3875.

I don't know why the simulation R7 = 53.5k but the real world R7 = 30k.

*** R7 must be 30k ***
Attached Images
File Type: jpg my designed amp.jpg (35.9 KB, 183 views)
  Reply With Quote
Old 2nd September 2011, 09:17 PM   #2
samod is offline samod  Ukraine
diyAudio Member
Join Date: Apr 2004
Location: Kiev
Send a message via Skype™ to samod
Hello, maybe you to try so?
Attached Images
File Type: jpg designed amp.JPG (31.0 KB, 139 views)
  Reply With Quote
Old 3rd September 2011, 10:46 AM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
The value of R7, the bias voltage applied to the FET gate, must be determined for each individual FET used.
The Vgs of FETs are all over the place. Test and measure every FET to allow a sensible prediction of the required bias voltage.
Or make a temporary connection with a VR and adjust the output voltage of the FET to a satisfactory operating point. Then replace the temp VR with a fixed R of equal value and re-check the FET output voltage..
regards Andrew T.
Sent from my desktop computer using a keyboard
  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
Luxman L 480 who designed this amp? moray james Solid State 3 23rd June 2010 03:56 PM
Custom designed transformer for Andrea Ciuffoli 6c33c OTL AMP.... zxcxz Tubes / Valves 2 10th July 2009 04:14 PM
Here"s a Simple 14w-32w Guitar amp I designed.... Minion Instruments and Amps 5 15th June 2008 02:51 PM
This is my designed PCB for ZEN Head-Amp fwh1599 Pass Labs 3 31st October 2003 11:06 AM
Designed an amp, it oscillates!!!!! Duo Solid State 7 15th September 2003 06:53 PM

New To Site? Need Help?

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