Go Back   Home > Forums > Amplifiers > Solid State

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
Reply
 
Thread Tools Search this Thread
Old 1st August 2001, 09:01 AM   #1
ergo is offline ergo  Estonia
diyAudio Member
 
Join Date: Mar 2001
Location: Tallinn, Estonia
Well, this one is not actually a question, but more like a punch of my ideas and perhaps someone will have comments on these ideas.

I'm working on my own class A push pull amp design. I wan't to experiment with some less common input and VA stage designs, so at first I tought I'd do a pcb design according to that but with possibility to turn the schematic to more common if the ideas will not work as well as expected.

Some time back though I saw a page where a diy-er had some connectors added to the amp pcb which let him change the CCS-s for example and then compare the different designs more easily.

This led me to idea to try to make my amp layout so that there is a very solid power supply, heatsink and the output stage on one pcb. The output stage would include two parallel push pull stages and a predriver stage + a bias voltage circuit with npn-pnp transistors determing the output stage current by their vbe voltages. Then there would be a 10 pin connector for sepparate pcb with input and VA stage. As the bias circuit is such that the different currects trough it do not need part changes it should make quite good platform for experiments.

Now assuming that a properly made class A output stage is sonically very good and I would make several different boards for two first stages it could be very interesting to be able to listen to one version for an hour or a week and then very quickly be able to change the additional pcb to some other topology.

It is of course a bit tricky and different boards would first need to be bugfree and have the stability needed, but still it would be interesting experiment. It would ideally provide an opportunity to listen to different topologies during one day and in same conditions and as such degrading the possible psychological effects.....

I have also developed a pc based spectral analyser for measurements. So I would be able to measure the THD and IMD and also provide a graphical images of different the spectral content of these measurements.

I at least haven't seen any such information on web and I think if I'd do a web page with the results it would interst some of you....

Anyway, any comments on my ideas are more than welcome.





__________________
Ergo
  Reply With Quote
Old 1st August 2001, 04:27 PM   #2
Jorge is offline Jorge  Brazil
diyAudio Member
 
Join Date: Apr 2001
Location: Brazil
Hi, Ergo

Nice idea.

I would like to hear about your findings.

Regards,

Jorge
  Reply With Quote
Old 2nd August 2001, 04:53 AM   #3
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Ergo,

What types of VA stages do you plan to experiment with?

Jam
  Reply With Quote
Old 2nd August 2001, 07:02 AM   #4
ergo is offline ergo  Estonia
diyAudio Member
 
Join Date: Mar 2001
Location: Tallinn, Estonia
Default VA stages

The first I would like to try are mirrored image topology and regular design that most amps have.... Later I will try out the design without dif amp in input etc...

__________________
Ergo
  Reply With Quote
Old 2nd August 2001, 11:00 PM   #5
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Ergo,

I have experimented with amps that do not use a differential front end with good results ie. better bandwidth and lower noise but there was no free lunch, to direct couple the amplifier I had to use a servo which has its own set of problems.

I am now experimenting with current feedback amplifiers which seem to offer the best of both worlds.

Jam
  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
trying to build an unusual PA maestrodave Everything Else 9 22nd August 2008 03:11 AM
Unusual TT. G Analogue Source 3 10th February 2008 10:26 PM
WTB: Unusual GE 6SN7GTB 69CamaroSS396 Swap Meet 4 9th June 2007 02:54 PM
**** another unusual hum problem !! Shoog Tubes / Valves 15 1st January 2005 03:49 PM
Unusual BJ Johnson Solid State 2 13th May 2003 06:08 PM


New To Site? Need Help?

All times are GMT. The time now is 03:55 PM.


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