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.

Easy-MOS is a simplistic, efficient and evolutive all-MOS amplifier for beginners
Easy-MOS is a simplistic, efficient and evolutive all-MOS amplifier for beginners
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 5th May 2019, 02:47 PM   #21
gannaji is offline gannaji  India
diyAudio Member
 
gannaji's Avatar
 
Join Date: Jan 2011
Location: Hyderabad
Tracerphone thread !
Dear Daniel,

Ref please !
--gannaji.
__________________
www.samritatrust.org
Teach me the glorious lesson that occasionally, I might be mistaken. Keep me reasonably sweet.
  Reply With Quote
Old 5th May 2019, 05:37 PM   #22
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
Here it is:
A small, low-voltage, battery operated amplifier
__________________
. .Circlophone your life !!!! . . ♫♪ My little cheap Circlophoneİ ♫♪
Electrify your daily life!!! ....⚡⚡ ELEKTRIA ⚡⚡
  Reply With Quote
Old 6th May 2019, 05:07 AM   #23
gannaji is offline gannaji  India
diyAudio Member
 
gannaji's Avatar
 
Join Date: Jan 2011
Location: Hyderabad
Oh ! Thank you !
__________________
www.samritatrust.org
Teach me the glorious lesson that occasionally, I might be mistaken. Keep me reasonably sweet.
  Reply With Quote
Old 7th May 2019, 04:45 PM   #24
danielwritesbac is offline danielwritesbac  United States
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Is there a 'best practices' way to put both left and right channels from the source, with minimal cancellations, into an EZmos mono amp? The 40's and 50's standard of mono in the corner, had a broader sweet spot, and was really tidy. I'm thinking, add tablet, get jukebox.
  Reply With Quote
Old 7th May 2019, 05:19 PM   #25
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
One advantage of an inverting configuration is that it is a stub of a mixing desk: simply duplicate C1/R12 input network n-times, and you get a clean n-input mixer, with low interaction between channels.

You can chose to multiply R12's value by n or keep them at 10K depending on input levels.
You can even make them variable.

Depending on the audio material and the way it was recorded, there might be cancellations at some frequencies, but that's kind of inevitable.
If the channels are mixed at the acoustic level (two speakers), cancellations will also occur, but they will probably be less sharp, and vary depending on the listening position.
With an electrical mixing, the cancellation will be completely independent from the listening position
__________________
. .Circlophone your life !!!! . . ♫♪ My little cheap Circlophoneİ ♫♪
Electrify your daily life!!! ....⚡⚡ ELEKTRIA ⚡⚡
  Reply With Quote
Old 7th May 2019, 06:01 PM   #26
Mark Tillotson is offline Mark Tillotson
diyAudio Member
 
Join Date: May 2018
Location: Cambridge UK
Quote:
Originally Posted by Elvee View Post
Because of the non-symetrical topology and the low feedback, low-order, even harmonics tend to be dominant.
Here is the THD residue (0.15%) together with the output signal:

Click the image to open in full size.
Well that's predominantly 3rd harmonic on screen, so I'm unconvinced by the spice values...
  Reply With Quote
Old 7th May 2019, 07:21 PM   #27
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
Well, neither am I, but that's the untampered reality, and to be honest the PMOS I used is different from the sim.

I tried to use a P-type that minimized the overall dist, because that's in fact what I prefer (except if the residue is something like Xover dist, which I hate).
This also explains why the measured THD is lower than the simmed one, a moderately rare instance.

Because complementarity does not actually exist for P or N MOS transistors, you are ~free to chose the ones that give you your preferred profile.

Another way of altering easily the profile is to make the source resistors different: it works in sim, and it will also work in reality (I didn't try it, but I am confident it will)
__________________
. .Circlophone your life !!!! . . ♫♪ My little cheap Circlophoneİ ♫♪
Electrify your daily life!!! ....⚡⚡ ELEKTRIA ⚡⚡
  Reply With Quote
Old 8th May 2019, 03:48 AM   #28
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
Quote:
Originally Posted by danielwritesbac View Post
Is there a 'best practices' way to put both left and right channels from the source, with minimal cancellations, into an EZmos mono amp? ....
Two resistors.

There's no sensible alternative.
  Reply With Quote
Old 8th May 2019, 09:25 AM   #29
anti is offline anti  Slovakia
diyAudio Member
 
Join Date: Jun 2008
Quote:
Originally Posted by PRR View Post
TWO resistors.

There's no sensible alternative.
Let's see ... ONE trimpot?

(a potentiometer with a knob would be a little bit arrogant in this case imho, but who knows...)
  Reply With Quote
Old 8th May 2019, 12:49 PM   #30
kokoriantz is offline kokoriantz  Lebanon
diyAudio Member
 
Join Date: Dec 2015
Location: south east asia
Consider for the input stage the ssm3k339 and use floating single supply as sublimed JLH1969
  Reply With Quote

Reply


Easy-MOS is a simplistic, efficient and evolutive all-MOS amplifier for beginnersHide 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
QUASI Amplifier for Beginners apexaudio Solid State 892 26th September 2019 08:51 AM
Efficient Subwoofer Amplifier moschfet Solid State 21 25th November 2012 04:13 PM
OLD THREAD Simplistic Mosfet HV Shunt (The Simpler Simplistic Design by Salas) quanghao Quanghao Audio Design 460 6th May 2012 11:13 PM
PCB for QUASI Amplifier for Beginners with changes!? radio Solid State 4 18th August 2011 08:59 PM


New To Site? Need Help?

All times are GMT. The time now is 05:16 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki