Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Vendor's Bazaar Commercial Vendors large & small hawking their wares

VSSA Lateral MosFet Amplifier
VSSA Lateral MosFet Amplifier
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 18th December 2012, 12:49 PM   #101
Idefixes is offline Idefixes  France
diyAudio Member
 
Idefixes's Avatar
 
Join Date: Dec 2003
Location: Mulhouse - Alsace
Send a message via ICQ to Idefixes
Quote:
Originally Posted by Lazy Cat View Post
No, no, standard parts on 50 x 80 mm PCB, only that I will use these output mosfets, ordered four.
Why 4? did plan to use more than one per chanel???

Will be 8A devices to drive 4 to 5ohms min speakers at +/-35VDC rails?

Marc
__________________
website : http://audiyofield.wifeo.com/index.php

Last edited by Idefixes; 18th December 2012 at 12:57 PM.
  Reply With Quote
Old 18th December 2012, 01:33 PM   #102
Lazy Cat is offline Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Idefixes View Post
Why 4? did plan to use more than one per chanel???

Will be 8A devices to drive 4 to 5ohms min speakers at +/-35VDC rails?

Marc
One ALF08NP16V5 per channel. Look it is simple, for Id=8A you need Vgs=6V, so at +/-38V PSU you get +/-32Vp on the output and that is 8Ap current. This device can do 8A continuos current within SOAR. So perfectly OK for one ALF08NP16V5 to drive 4 ohm at +/38V rails potential and you get out 128Wmax/4 ohm.
  Reply With Quote
Old 18th December 2012, 01:37 PM   #103
Idefixes is offline Idefixes  France
diyAudio Member
 
Idefixes's Avatar
 
Join Date: Dec 2003
Location: Mulhouse - Alsace
Send a message via ICQ to Idefixes
Quote:
Originally Posted by Lazy Cat View Post
One ALF08NP16V5 per channel. Look it is simple, for Id=8A you need Vgs=6V, so at +/-38V PSU you get +/-32Vp on the output and that is 8Ap current. This device can do 8A continuos current within SOAR. So perfectly OK for one ALF08NP16V5 to drive 4 ohm at +/38V rails potential and you get out 128Wmax/4 ohm.
Who very interesting....i think i have little home work on eagle this evening...

Marc
__________________
website : http://audiyofield.wifeo.com/index.php
  Reply With Quote
Old 18th December 2012, 02:04 PM   #104
Lazy Cat is offline Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Look Marc here's VSSA PCB preliminary. All three transistors to main heatsink, TO-126 will have 2 mm ceramic insulators, so very little capacitance to main heatsink (GND) and still enough heat dissipation. PCB fixed with these three screws only, each 2,2 mF/40V replaced with two 1mF/50V, etc. So you can get an idea ...
Attached Images
File Type: jpg VSSA preliminary.jpg (91.1 KB, 2214 views)
  Reply With Quote
Old 18th December 2012, 02:13 PM   #105
Idefixes is offline Idefixes  France
diyAudio Member
 
Idefixes's Avatar
 
Join Date: Dec 2003
Location: Mulhouse - Alsace
Send a message via ICQ to Idefixes
Quote:
Originally Posted by Lazy Cat View Post
Look Marc here's VSSA PCB preliminary. All three transistors to main heatsink, TO-126 will have 2 mm ceramic insulators, so very little capacitance to main heatsink (GND) and still enough heat dissipation. PCB fixed with these three screws only, each 2,2 mF/40V replaced with two 1mF/50V, etc. So you can get an idea ...
Rhaaa lovely....will play with that if allow.

Marc
__________________
website : http://audiyofield.wifeo.com/index.php
  Reply With Quote
Old 18th December 2012, 02:26 PM   #106
Lazy Cat is offline Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by tinitus View Post
cool looking little amp maybe time to go build that active speaker
Yes, VSSA PCB will be perfectly suitable for that purpose, just wait a little.
  Reply With Quote
Old 18th December 2012, 07:19 PM   #107
400kg is offline 400kg  Turkey
Banned
 
Join Date: Jan 2012
Location: kangal/sivas
Send a message via MSN to 400kg
hi Lazy Cat
Can you do symmetric 50V version ?
  Reply With Quote
Old 18th December 2012, 07:46 PM   #108
Idefixes is offline Idefixes  France
diyAudio Member
 
Idefixes's Avatar
 
Join Date: Dec 2003
Location: Mulhouse - Alsace
Send a message via ICQ to Idefixes
ALF08NP16V5 board try : 75x66mm
Attached Images
File Type: png VSSA_ALF08NP16V5.png (27.6 KB, 2203 views)
__________________
website : http://audiyofield.wifeo.com/index.php
  Reply With Quote
Old 18th December 2012, 08:47 PM   #109
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
Sonny.. Regarding the tendency for the VAS to run thermally away, I have seen that a thermistor across the 470 Ohm rail resister can balance that out. I have currently two amplifiers playing, one bare stripped to simplest basic (like this) and one with everything. CCS's mirror's hawksford-casodes (input and VAS/Driver). Have not yet heard them in the same setup, but sometime during January I will... But first I need to cut some diamond for the CES.
  Reply With Quote
Old 18th December 2012, 09:24 PM   #110
Lazy Cat is offline Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Idefixes View Post
ALF08NP16V5 board try : 75x66mm
Very good.

It will take me some more time but will do it anyway.
  Reply With Quote

Reply


VSSA Lateral MosFet AmplifierHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2SK/irfp lateral vertical mosfet amplifier HELP ?? medogrizli Solid State 58 5th March 2017 10:18 AM
Really simple lateral mosfet amplifier Tekko Solid State 11 25th March 2013 06:31 PM
Magic - My first Lateral MOSFET Push-Pull amplifier shaan Solid State 44 7th September 2011 11:47 AM
200 Watt Lateral Mosfet Amplifier macgyver Solid State 32 14th January 2005 06:37 AM
200W Lateral Mosfet Amplifier macgyver Solid State 5 7th July 2003 07:49 PM


New To Site? Need Help?

All times are GMT. The time now is 12:29 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki