50+50 v rails

sakis · 14th February 2012, 08:30 AM

often while repairing amplifiers all boards need to be replaced .That is also a very common practice between professional amplifier that often and up in flames so since case/heatsink/trafo is available then a couple of boards will be a walk in the park to install

now from diy point of view there is a gozillion available schematics/boards for many applications and some of them come with detailed presentations and or extensive threads

One thing is missing though is Class AB amplifier with two transistor in the output but possible to operate in 50+50 volt rails

we ll know that 50+50 rails with only two transistors is risky and obviously out of SOA of any known transistor but on the other hand is common commercial practice to do that but with a Vi limiter installed .

In case i missed something and there is a schematic possible to operate one may please point it to me

on the other hand it seems that its a good time to clone any rotel or sansui that works under this principal and diy it all the way through

kind regards
sakis

AndrewT · 14th February 2012, 10:58 AM

I used Crimson Power amplifier modules.
CE1704 to drive 8ohms speaker from +-50Vdc.

I never blew up any of them.

They used a single pair of 2n3773, which are "only" 150W devices.

You could use one pair of 250W devices that are just as robust and considerably faster to easily get 100W into 8r0 and safely drive a severe reactance 8ohms speaker.

ainrain · 14th February 2012, 11:46 AM

Look at SYMASYM. AAK-s version was with 50v rails: My new SymAsym PCB design Rev_1.3

Idefixes · 14th February 2012, 12:07 PM

Nmos 200 from Quasi correspond to goal single paire of output mosfet and +/-50Vdc rail.

Nmos200 - Quasi's DIY Audio Site

Marc

14th February 2012, 08:30 AM	#1
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	50+50 v rails often while repairing amplifiers all boards need to be replaced .That is also a very common practice between professional amplifier that often and up in flames so since case/heatsink/trafo is available then a couple of boards will be a walk in the park to install now from diy point of view there is a gozillion available schematics/boards for many applications and some of them come with detailed presentations and or extensive threads One thing is missing though is Class AB amplifier with two transistor in the output but possible to operate in 50+50 volt rails we ll know that 50+50 rails with only two transistors is risky and obviously out of SOA of any known transistor but on the other hand is common commercial practice to do that but with a Vi limiter installed . In case i missed something and there is a schematic possible to operate one may please point it to me on the other hand it seems that its a good time to clone any rotel or sansui that works under this principal and diy it all the way through kind regards sakis __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

14th February 2012, 12:07 PM	#4
Idefixes diyAudio Member Join Date: Dec 2003 Location: Mulhouse - Alsace	Nmos 200 from Quasi correspond to goal single paire of output mosfet and +/-50Vdc rail. Nmos200 - Quasi's DIY Audio Site Marc __________________ website : http://audiyofield.wifeo.com/index.php

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14th February 2012, 10:58 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I used Crimson Power amplifier modules. CE1704 to drive 8ohms speaker from +-50Vdc. I never blew up any of them. They used a single pair of 2n3773, which are "only" 150W devices. You could use one pair of 250W devices that are just as robust and considerably faster to easily get 100W into 8r0 and safely drive a severe reactance 8ohms speaker.

14th February 2012, 11:46 AM	#3
ainrain diyAudio Member Join Date: Nov 2005 Location: est	Look at SYMASYM. AAK-s version was with 50v rails: My new SymAsym PCB design Rev_1.3