12 Volt MOSFET SE Class A Hi-Fi HeadPhone Amp - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 16th July 2008, 10:26 AM   #1
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Cool 12 Volt MOSFET SE Class A Hi-Fi HeadPhone Amp

Good hifi

Intended for High Fidelity 32 Ohms Headphones.

- 12 Volt DC, preferably regulated 78M12 or LM317
- 2N3819 JFET high impedance input
- ZVP3306A, TO-92 PMOS, VAS Voltage amp stage
- IRF610 Single End 125 mA Class A output
- Internal Bandwidth is 8 MHz ( Closed Loop without RF input filter )
- Gain +10 dB ( x3.1 )
- Distortion in 32 Ohm/1 mW is below -100 dB, 0.001%

I attach my simplified concept diagram.
If anyone wants, I post my full, tweaked and optimized working simulated tested circuit.

Lineup Audio
Attached Images
File Type: png 4e_sh1-simple.png (3.2 KB, 712 views)
__________________
lineup
  Reply With Quote
Old 16th July 2008, 12:21 PM   #2
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
hi

If you use for example Grado Hi-Fi Headphones 32 Ohm
http://www.gradolabs.com/
you have a specification: Sensitivity, SPL at 1 mWatt = XX dB
This means, at 1 mW you will have Sound Pressure Level of XX dB in your ears.

Say we have headphones with SPL = 98 dB / 1 mW
At 10 mWatt we will have another +10 dB
Which in this case give a sound pressure of 108 dB ... !!!
... dangerous, yes .. I have tinitus .. a damage caused by headphones
... be very careful, my friends

I attach the very nice Fourier spectrum of this Class A MOSFET amplifier.
In fact the harmonics are like this at any output level .. until overdriven/clipping.

FFT at 10 milliWatt, +10 dB
Attached Images
File Type: png hpa_mosfet_class-a_fft-10mw.png (2.2 KB, 508 views)
__________________
lineup
  Reply With Quote
Old 16th July 2008, 12:41 PM   #3
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Re: 12 Volt MOSFET SE Class A Hi-Fi HeadPhone Amp

Quote:
Originally posted by lineup
If anyone wants, I post my full, tweaked and optimized working simulated tested circuit.

Lineup Audio

Very nice! Give us the full thing! We like.
  Reply With Quote
Old 18th July 2008, 01:49 AM   #4
diyAudio Member
 
d to the g's Avatar
 
Join Date: Aug 2006
Location: minimalopolis
2nd.

motion passes, gives us the precious schematic.
  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
MOSFET follower headphone amplifier GRollins Headphone Systems 125 5th August 2012 07:54 PM
headphone amplifier = tube + mosfet sparkle Headphone Systems 25 23rd June 2009 02:52 PM
Fault with MOSFET based headphone amp zebra100 Headphone Systems 8 7th October 2008 03:29 PM
Regulated PSU for MOSFET headphone amp zebra100 Headphone Systems 9 25th September 2008 05:59 PM


New To Site? Need Help?

All times are GMT. The time now is 07:06 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