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

Solid State Talk all about solid state amplification.

Diamond Amp
Diamond Amp
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 4th October 2012, 06:15 AM   #11
wponline is offline wponline  Philippines
diyAudio Member
Join Date: Nov 2007
Location: It's more fun in the Philippines
Default Diamond Amp

Originally posted by lumanauw
[B]Put emittor follower before Q1-Q2's base?

As suggested by Lumanauw (thank you) I put an emitter follower before Q1 and Q2 and it improved the performance even more.

You should also notice that R169 and R170 are not 100R any more. I found that you can trim the diamond stage current matching and cancel the distortion even further. This in turn does increase the output bias which does increase the distortion, so R172 and R173 have to be adjusted as well to keep the 3-6mA/stage output bias.

With these tweaks the
distortion drops to 0.002% and the
output impedance is 0.001R.
(All simulated for the moment)

With such a low output impedance the amp can drive a 2R load with ease and low distortion.

A cool running amp, such as this design, is very useful in the hot summer days that we are having in New Zealand at the moment.


Dear Tim,

Been looking for a Hiraga 20W biased into Class AB or B and your post was returned. Since this post is almost years now, I wonder if you were able to build this amplifier?

I had built a JLH Class A (single supply and dual supply on Geoff's page) but since I'm located at a tropical country, The amp gets really hot and I have to put a box fan to cool the heatsink.

I'm very much interested to build your amp although I would appreciate if the output amp can be changed to a bipolar transistor (have extra MJ15024G).

Would appreciate your advice and further information.

Best regards,
  Reply With Quote


Diamond AmpHide 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
Wharfedale Diamond 9.1 internal pic tktran303 Multi-Way 1 31st January 2009 08:07 AM
A question about diamond buffers darian Analog Line Level 3 24th June 2008 07:38 PM
Diamond buffers Nordic Parts 7 13th March 2007 02:13 PM
diamond tip replacement djmiddelkoop Analogue Source 2 19th October 2004 06:44 PM
Diamond buffer peranders Solid State 45 15th November 2003 11:00 PM

New To Site? Need Help?

All times are GMT. The time now is 03:06 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio