HA-PRO Single-ended MOSFET

ljm_ljm · 30th September 2011, 03:11 AM

CLASS A Headphone Amplifier

Some material, convenient friends of the production.

Need to pay attention to, it USES AC 24-0 input, low voltage will make failure noise voltage.

Had better not exceed AC28-0.

10 the resistance controls the MOSFET IQ,

About 650 MV / 10 R = 65 MA

It is a, very hot. Headphone amplifiers

Bernie7 · 2nd October 2011, 12:13 PM

Is this a "no feedback" design?

ljm_ljm · 2nd October 2011, 12:22 PM

NO. it has feedback. R13 .
It is a single ended, OTL amplifier.

Leolabs · 7th October 2011, 07:01 AM

Naim NAC42.5 with different output stage

rjm · 7th October 2011, 12:36 PM

as sold in kit form on ebay for $30+$10 shipping

The mods should probably delete or move this thread, as it is not a diy project.

It is cheap though, I'll give you that.

ljm_ljm · 14th October 2011, 12:48 PM

Quote:

Originally Posted by Leolabs

Naim NAC42.5 with different output stage

right.

southernoise · 4th July 2012, 03:28 AM

What transformer VA rating should I use for this kit?

How largr the Heatsink? Thanks.

monty78pig · 11th July 2012, 09:17 AM

This looks very similar to one of my designs on the thread: Simplistic Class A MOSFET Headphone w Feedback: have I got my values right?

southernoise · 22nd November 2012, 08:23 AM

Is it OK to use this as a preamp to my gainclone?

ljm_ljm · 27th April 2013, 03:50 PM

I modified the PCB again.
Convenient installation.
Using relatively simple LM7824 as a voltage regulator IC. Its experience in practical use. Has a good power supply ripple control.

7th October 2011, 12:36 PM	#5
rjm Richard Murdey diyAudio Member Join Date: May 2004 Location: Kyoto Blog Entries: 70	as sold in kit form on ebay for $30+$10 shipping The mods should probably delete or move this thread, as it is not a diy project. It is cheap though, I'll give you that. __________________ RJM Audio (phonoclone.com / G+)

11th July 2012, 09:17 AM	#8
monty78pig diyAudio Member Join Date: Aug 2011 Location: London	This looks very similar to one of my designs on the thread: Simplistic Class A MOSFET Headphone w Feedback: have I got my values right? __________________ With perfect linearity, it is impossible to go off on a tangent. Also; My Sziklai pairs are better than your MOSFETs/Darlingtons/Pentodes/Triodes

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2nd October 2011, 12:13 PM	#2
Bernie7 diyAudio Member Join Date: Dec 2008	Is this a "no feedback" design?

2nd October 2011, 12:22 PM	#3
ljm_ljm diyAudio Member Join Date: Sep 2006	NO. it has feedback. R13 . It is a single ended, OTL amplifier.

7th October 2011, 07:01 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Naim NAC42.5 with different output stage

4th July 2012, 03:28 AM	#7
southernoise diyAudio Member Join Date: Mar 2010	What transformer VA rating should I use for this kit? How largr the Heatsink? Thanks.

22nd November 2012, 08:23 AM	#9
southernoise diyAudio Member Join Date: Mar 2010	Is it OK to use this as a preamp to my gainclone?