5W Single Ended Class A Power Amp From Mark Houston - 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 11th April 2011, 12:16 AM   #1
SSDIY is offline SSDIY  Hong Kong
diyAudio Member
 
Join Date: Oct 2009
Location: Hong Kong
Default 5W Single Ended Class A Power Amp From Mark Houston

I have built this 5W Class A power amp designed by Mark Houston and feel happy with it's sounding performance. I am wondering now if I could use 2SK1058's complementary pair 2SJ162 to build one more power amp as the supplier sell them together. Please advice.
Attached Images
File Type: jpg sch_ZCA.jpg (32.1 KB, 1458 views)
  Reply With Quote
Old 11th April 2011, 07:04 AM   #2
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
You can replace resistor 15R with a current source based on 2SJ162.
It should give like 0.8A current.
You need 2 resistors and a transistor besides 2SJ162.
See diagram

This will improve the amplifier considerably.
Attached Images
File Type: png SJ162.png (4.0 KB, 1319 views)
__________________
lineup
  Reply With Quote
Old 11th April 2011, 08:56 AM   #3
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
The 820mOhm, 0.82 Ohm, resistor sets the current ~ 0.8A
__________________
lineup
  Reply With Quote
Old 11th April 2011, 12:09 PM   #4
diyAudio Member
 
Join Date: Apr 2011
nice for head phones
  Reply With Quote
Old 11th April 2011, 12:27 PM   #5
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Blog Entries: 2
I think SSDIY is looking for a way to build another amp not improve this one. The answer lies in using the complimentary part as an active device with resistive load of course, only you have to put the active device on top and the resistor underneath.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 11th April 2011, 01:03 PM   #6
diyAudio Member
 
Join Date: Nov 2010
Hate to disappoint, this is not a 5W amp, 1 W rms is closer.
  Reply With Quote
Old 11th April 2011, 01:06 PM   #7
diyAudio Member
 
Join Date: Nov 2010
With the constant current mod, it will come up to 2.5W rms.
  Reply With Quote
Old 11th April 2011, 04:22 PM   #8
SSDIY is offline SSDIY  Hong Kong
diyAudio Member
 
Join Date: Oct 2009
Location: Hong Kong
Hi guys

Thank you for all your inputs. What I mean is to replace the 2SK1058 by 2SJ162 and apply a -24v to it. Other parts and components remain unchanged. Would the circuit work properly with this change? Please advice.
  Reply With Quote
Old 11th April 2011, 04:41 PM   #9
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
No, it is made for both 2SK1058 and SJ201.

But sure is possible to make such circuit.
It will be kinda upside down because 2SJ162 is P-channel transistor.
__________________
lineup
  Reply With Quote
Old 11th April 2011, 05:35 PM   #10
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Here is a version for 2SJ162.

Note that power supply V+ is connected to GROUND.
And so GROUND is the upper part.
But as long as you note polarity of electrolytic capacitors
it should not be a problem.

A stereo system should be 2 such with 2SJ162
as 2SK1058 has a bit different caracteristic from 2SJ162.
Attached Images
File Type: png mark_upsidedown.png (5.9 KB, 1145 views)
__________________
lineup
  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
GERMANIUM Single ended Class A Headphone Amp. Mooly Headphone Systems 74 18th January 2014 10:19 AM
push pull Vs single ended class A amp space2000 Solid State 25 23rd August 2008 03:31 PM
Single ended amp from class A push-pull Wavebourn Tubes / Valves 2 12th October 2007 09:14 PM
Proposal On Single Ended Class-D Subwoofer Amp Workhorse Class D 8 27th January 2004 09:11 AM


New To Site? Need Help?

All times are GMT. The time now is 02:49 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