Hot Follower 99 - Page 2 - diyAudio
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 10th January 2006, 03:42 AM   #11
diyAudio Member
 
MEGA_amp's Avatar
 
Join Date: Oct 2003
Location: CT
Well I'll give it a hack, its diy, why not. I mostly listen nearfield with the music rather low, dont need gobs of current or wattage.
What could I use in place of the recommended 2SC3264/2SA1295 devices? Some missing resistor values may help too.

Thanks for the input.

John
  Reply With Quote
Old 10th January 2006, 03:54 AM   #12
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Quote:
Originally posted by MEGA-amp
Some missing resistor values may help too.

The value of the missing resistors , depend of the value of the maximal output current , that you want to be passing through the outputs.
__________________
Jorge
  Reply With Quote
Old 10th January 2006, 07:40 AM   #13
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
You could build this with about any suitable devices.

Try adding the cap from the cool follower design, it will then transition into class AB for the peaks.
  Reply With Quote
Old 10th January 2006, 07:40 PM   #14
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi John,
Djk is right. I've built them with different devices and it always works. You will have to play with resistor values to set the bias current and things like that.

-Chris
  Reply With Quote
Old 13th January 2006, 10:07 AM   #15
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
Default Info

Just to explain some points:

- The Power Follower is a complete project tested by many people in the world and it gives an incredible sonic performances if driven with a correct voltage amplifier stage.
Someone prefer it to a SE 300B amp and to the ZEN amp.

- The Hot Follower is only an idea and I don't' have tested it.
This will give a good sound but cannot be compared to the Power Follower because this is a normal Push-Pull design.
  Reply With Quote
Old 9th February 2006, 02:52 PM   #16
beppe61 is offline beppe61  Italy
diyAudio Member
 
Join Date: Feb 2005
Location: torino
Default Re: Info

Quote:
Originally posted by audiodesign
Just to explain some points:
- The Power Follower is a complete project tested by many people in the world and it gives an incredible sonic performances if driven with a correct voltage amplifier stage.
Someone prefer it to a SE 300B amp and to the ZEN amp.
...

Dear Sir,

is a complete schematic of "THE POWER FOLLOWER" available somewhere in the net?
I am very much interested in high current follower having already nice voltage gain stages to test.
After your wonderful comments I am more excited than ever !
"Preferred to a SE300B and to a ZEN amp": this really means something to me.
Please give me some more information on the "TPF".
Thank you so much.
Kind regards,

beppe

  Reply With Quote
Old 9th February 2006, 03:14 PM   #17
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
look this webpage

http://www.audiodesignguide.com/Powe...wer/index.html

on my website

http://www.audiodesignguide.com
  Reply With Quote
Old 9th February 2006, 03:22 PM   #18
beppe61 is offline beppe61  Italy
diyAudio Member
 
Join Date: Feb 2005
Location: torino
Quote:
Originally posted by audiodesign
look this webpage
http://www.audiodesignguide.com/Powe...wer/index.html
on my website
http://www.audiodesignguide.com
Dear Sir,

thank you sincerely for your extremely kind and valuable reply.
Just to be sure the schematic you propose is the one I am attaching?
Do you think that with a dual power supply I could go without the coupling cap at the output?
What is your opinion on the influence of that cap ?

Thank you so much.
Kind regards,

beppe
Attached Images
File Type: jpg follower_99d.jpg (91.5 KB, 413 views)
  Reply With Quote
Old 9th February 2006, 04:15 PM   #19
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
Quote:
Originally posted by Tube_Dude
The current feeding the output transistors came only from the CCS, as the input transistors can't source any current into the outputs..
Exactly, so the CCS current should be quite high (which gives a whole new meaning to 'hot' follower).
Unfortunately, the only new and never seen thing in that design are the capacitors from the CCS sensing transistor collectors to ground, which, at power on, give a nice current spike through the whole thing. Increase the capacitance sufficiently and various pieces of the follwer will go up in smoke. Also, they completely ruin any semblance of PSRR for the follwer - more than 0.7V ripple on the power rails shuts down the corrsponding CCS completely. Unfortunately, such features are not rare in Andrea's designs
  Reply With Quote
Old 9th February 2006, 04:43 PM   #20
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Quote:
Originally posted by ilimzn
Also, they completely ruin any semblance of PSRR for the follwer - more than 0.7V ripple on the power rails shuts down the corrsponding CCS completely. Unfortunately, such features are not rare in Andrea's designs

Yes...and in this last schematic (post # 18 ) , I also don't like to see the input ground connected to the positive rail , because the source of the Mosfet is referenced to the minus rail..

Look at the same subject here:


OTA - One Transistor Amplifier
__________________
Jorge
  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
Hot follower/cool follower webercarbmann Solid State 13 2nd November 2010 02:23 PM
Need help with DC follower/peak follower HELP! gain wire Parts 4 8th July 2008 03:32 PM
Question about direct coupling a anode follower into a cathode follower. G Tubes / Valves 45 29th July 2004 06:47 PM
hot follower UrSv Pass Labs 2 25th September 2002 04:49 PM


New To Site? Need Help?

All times are GMT. The time now is 02:09 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