HA-PRO Single-ended MOSFET - diyAudio
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Old 30th September 2011, 03:11 AM   #1
ljm_ljm is offline ljm_ljm  China
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Default HA-PRO Single-ended MOSFET

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
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Old 2nd October 2011, 12:13 PM   #2
Bernie7 is offline Bernie7  Singapore
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Is this a "no feedback" design?
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Old 2nd October 2011, 12:22 PM   #3
ljm_ljm is offline ljm_ljm  China
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NO. it has feedback. R13 .
It is a single ended, OTL amplifier.
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Old 7th October 2011, 07:01 AM   #4
Leolabs is offline Leolabs  Malaysia
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Naim NAC42.5 with different output stage
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Old 7th October 2011, 12:36 PM   #5
rjm is offline rjm  Japan
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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.
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Old 14th October 2011, 12:48 PM   #6
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Leolabs View Post
Naim NAC42.5 with different output stage


right.
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Old 4th July 2012, 03:28 AM   #7
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What transformer VA rating should I use for this kit?

How largr the Heatsink? Thanks.
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Old 11th July 2012, 09:17 AM   #8
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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?
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Old 22nd November 2012, 08:23 AM   #9
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Is it OK to use this as a preamp to my gainclone?
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Old 27th April 2013, 03:50 PM   #10
ljm_ljm is offline ljm_ljm  China
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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.
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