Go Back   Home > Forums > >

Headphone Systems Everything to do with Headphones

LuFo Lite - a 1 Transistor SE Class A Headphone Amp
LuFo Lite - a 1 Transistor SE Class A Headphone Amp
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
Old 22nd July 2021, 03:32 AM   #31
Skip Pack is offline Skip Pack  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Northern California
My question exactly. I have two on the shelf and have your Lu1014 boards and a stash of calibrated LUs.
  Reply With Quote
Old 22nd July 2021, 03:47 AM   #32
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
LuFo Lite - a 1 Transistor SE Class A Headphone Amp
I forgot that I ran the sims a while back. Yes, 20mH is enough to double the output swing into 32ohms.
__________________
XRKaudio Store // Manufacturer’s Forum
  Reply With Quote
Old 22nd July 2021, 07:50 AM   #33
marconi118 is offline marconi118  Germany
diyAudio Member
 
Join Date: Mar 2008
Logically you should double the mH if you double the speaker impedance....

So these 20 mH 6A crossover inductors could be candidate for 4ohm speaker LuFo with high bias let's say 4A
  Reply With Quote
Old 22nd July 2021, 08:11 AM   #34
marconi118 is offline marconi118  Germany
diyAudio Member
 
Join Date: Mar 2008
I am wondering how a jentzen 53333 47mH 2.5dcr would perform...
It is quite cheap at 15euro
  Reply With Quote
Old 22nd July 2021, 11:53 AM   #35
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
LuFo Lite - a 1 Transistor SE Class A Headphone Amp
Lower impedance speaker requires more current, and that would require more stored magnetic energy, no?

For filters, inductor values scale with impedance, but this is not a filter but rather, a dynamic storage “battery”.

That Jantzen is an iron core crossover inductor with ferrite discs. I don’t know how much DC current that can take without saturating. It’s cheap enough to try?
__________________
XRKaudio Store // Manufacturer’s Forum

Last edited by xrk971; 22nd July 2021 at 11:58 AM.
  Reply With Quote
Old 23rd July 2021, 10:15 PM   #36
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
LuFo Lite - a 1 Transistor SE Class A Headphone Amp
I just got a pair of LSA HP-2 dynamic headphones - these are waveguide loaded (front horn), closed back, graphene coated diaphragm drivers, 105dB/mW and 33ohms. Connected them to the LuFo Lite. In a word - wow! These are excellent headphones and the resolution and texture of the bass can really be heard nicely, the midrange is butter smooth and natural sounding. Very comfy and lightweight with real leather ear pads, headband, and wooden ear cups.

LuFo Lite - a 1 Transistor SE Class A Headphone Amp-edcfb0e8-c477-4673-8c5d-31d3b6c6c7be-jpeg
Attached Images
File Type: jpeg EDCFB0E8-C477-4673-8C5D-31D3B6C6C7BE.jpeg (479.0 KB, 461 views)
__________________
XRKaudio Store // Manufacturer’s Forum
  Reply With Quote
Old 24th July 2021, 05:26 PM   #37
Skip Pack is offline Skip Pack  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Northern California
Have you ordered your first test PCBs? If so would 4-6 weeks be a likely timeframe for ones we might purchase? (optimistic, of course). Thanks
  Reply With Quote
Old 24th July 2021, 10:40 PM   #38
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
LuFo Lite - a 1 Transistor SE Class A Headphone Amp
No not yet, plan to soon. They should be here within 10 days if I order tonight. Sort of trying to consolidate a few more boards in same shipment. We will need to build a verification build. It’s pretty simple so I don’t expect any problems.
__________________
XRKaudio Store // Manufacturer’s Forum
  Reply With Quote
Old 17th August 2021, 03:45 AM   #39
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC (Virginia)
LuFo Lite - a 1 Transistor SE Class A Headphone Amp
Here are the LuFo Lite BOM, schematics, and stuffing diagram.
Attached Files
File Type: zip LuFo-Lite-BOM-v0a.zip (192.6 KB, 43 views)
__________________
XRKaudio Store // Manufacturer’s Forum

Last edited by xrk971; 17th August 2021 at 03:53 AM.
  Reply With Quote
Old 17th August 2021, 07:02 AM   #40
nautibuoy is offline nautibuoy  United Kingdom
diyAudio Member
 
nautibuoy's Avatar
 
Join Date: Jan 2010
Location: Somerset, England
Thanks X.

Here's another possible inductor for LuFo Lite, very cost effective!

https://www.mouser.co.uk/ProductDeta...4dDGW6C96rclk=
Attached Images
File Type: jpg Capture.JPG (15.7 KB, 250 views)
  Reply With Quote

Reply


LuFo Lite - a 1 Transistor SE Class A Headphone AmpHide this!Advertise here!
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
LuFo Amp - 39w SE Class A from 28v Rail xrk971 Pass Labs 703 20th August 2021 05:59 PM
Noir, a two transistor headphone amp: class-A, single ended, 150mA bias Mark Johnson Headphone Systems 319 16th August 2021 02:00 AM
OPA454 Front End for LuFo Amp xrk971 XRK Audio 9 30th June 2021 04:50 PM
Clone Audio Technica Class A AT-HA5000 FET Transistor Headphone Amplifier NTSBuilding Headphone Systems 51 21st December 2019 04:15 PM
Balanced Drive 2 Transistor SE Class A Headphone Amp xrk971 Headphone Systems 26 30th July 2019 12:44 PM


New To Site? Need Help?

All times are GMT. The time now is 10:19 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki