ss/chip amp hybrid?

xeclipse · 27th May 2010, 11:57 AM

Hi guys,
is it possible to use chip amp for driver stage and mosfets for output stage?

jcx · 27th May 2010, 01:47 PM

one possibility is to use the floating ps output stage - allows low voltage op amps to control output transistors which give the full supply Vgain

qsc and clones.... backwards amps

QSC and others have used the topology with an op amp front end

you could have A/DSL driver op amps directly driving the output mosfet gates with this topology - the entire amp's active circuitry could be op amps except for the output Q

djk · 28th May 2010, 04:39 PM

Yes, build a Hafler TransNova with an opamp for the front end.

xeclipse · 29th May 2010, 09:13 AM

Hi Djk,
i did some digging but couldn't find any hafler schematic with op amp.Do you have one?
Thanks.

xeclipse · 29th May 2010, 09:15 AM

Hi Djk,
i did some digging but couldn't find any hafler schematic with op amp.Do you have one?
Thanks.

AndrewT · 29th May 2010, 12:17 PM

lme49830 voltage amp & driver stage is designed specifically for a discrete MosFET output stage.
Makes for a pretty good hybrid of chip & discrete SS amplifier.

xeclipse · 29th May 2010, 04:09 PM

Hi Andrew,
that was my first option together with lm4702,but the drivers are not available here in Kenya.
I could easily replicate a pioneer car amp and add more mosfets though,but i couldn't find someone willing to have his dismantled.Does anyone have a pioneer car amp schematic?Pioneer parts are available.
In a country full of cheap china products,diy is the way to go,not even pioneer amps produce the power it claims! I need the power of several of them.

djk · 29th May 2010, 08:16 PM

IMAGE

The opamp would connect to the junction of CR2, CR3, and replace the discrete driver circuit. Pull-up/pull-down resistors would be added to the ends of the bias string. Opamp uses inverting input, feed back is connected to the non-inverting input.

xeclipse · 30th May 2010, 09:11 AM

Hallo Djk,
wow! Thanks man. That hafler schematic has such a neat output stage.
You mentioned pull-up/pull-down resistors,please explain that.
Sorry for all these questions,this is my first ss power amp.
Thanks again!

Shaun · 30th May 2010, 04:10 PM

Hi Xeclipse

Have you considered importing? Connexelectronics offers the components, PCBs and complete kits. See Class AB amps.

27th May 2010, 11:57 AM	#1
xeclipse diyAudio Member Join Date: May 2010 Location: Where the world's best tea come from:Kericho Kenya	ss/chip amp hybrid? Hi guys, is it possible to use chip amp for driver stage and mosfets for output stage? __________________ if there are no sparks,it probably doesn't work!

28th May 2010, 04:39 PM	#3
djk diyAudio Member Join Date: Feb 2001 Location: USA	Yes, build a Hafler TransNova with an opamp for the front end. __________________ Candidates for the Darwin Award should not read this author.

29th May 2010, 09:13 AM	#4
xeclipse diyAudio Member Join Date: May 2010 Location: Where the world's best tea come from:Kericho Kenya	Hi Djk, i did some digging but couldn't find any hafler schematic with op amp.Do you have one? Thanks. __________________ if there are no sparks,it probably doesn't work!

29th May 2010, 09:15 AM	#5
xeclipse diyAudio Member Join Date: May 2010 Location: Where the world's best tea come from:Kericho Kenya	hafler schematic? Hi Djk, i did some digging but couldn't find any hafler schematic with op amp.Do you have one? Thanks. __________________ if there are no sparks,it probably doesn't work!

29th May 2010, 04:09 PM	#7
xeclipse diyAudio Member Join Date: May 2010 Location: Where the world's best tea come from:Kericho Kenya	Hi Andrew, that was my first option together with lm4702,but the drivers are not available here in Kenya. I could easily replicate a pioneer car amp and add more mosfets though,but i couldn't find someone willing to have his dismantled.Does anyone have a pioneer car amp schematic?Pioneer parts are available. In a country full of cheap china products,diy is the way to go,not even pioneer amps produce the power it claims! I need the power of several of them. __________________ if there are no sparks,it probably doesn't work!


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27th May 2010, 01:47 PM	#2
jcx diyAudio Member Join Date: Feb 2003 Location: ..	one possibility is to use the floating ps output stage - allows low voltage op amps to control output transistors which give the full supply Vgain qsc and clones.... backwards amps QSC and others have used the topology with an op amp front end you could have A/DSL driver op amps directly driving the output mosfet gates with this topology - the entire amp's active circuitry could be op amps except for the output Q

29th May 2010, 12:17 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	lme49830 voltage amp & driver stage is designed specifically for a discrete MosFET output stage. Makes for a pretty good hybrid of chip & discrete SS amplifier.

29th May 2010, 08:16 PM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	IMAGE The opamp would connect to the junction of CR2, CR3, and replace the discrete driver circuit. Pull-up/pull-down resistors would be added to the ends of the bias string. Opamp uses inverting input, feed back is connected to the non-inverting input. __________________ Candidates for the Darwin Award should not read this author.

30th May 2010, 09:11 AM	#9
xeclipse diyAudio Member Join Date: May 2010 Location: Where the world's best tea come from:Kericho Kenya	Hallo Djk, wow! Thanks man. That hafler schematic has such a neat output stage. You mentioned pull-up/pull-down resistors,please explain that. Sorry for all these questions,this is my first ss power amp. Thanks again! __________________ if there are no sparks,it probably doesn't work!

30th May 2010, 04:10 PM	#10
Shaun diyAudio Member Join Date: Aug 2001 Location: Cape Town, South Africa	Hi Xeclipse Have you considered importing? Connexelectronics offers the components, PCBs and complete kits. See Class AB amps. __________________ Shaun Onverwacht \|\|\|\|\|\|\|\|\|\| DON'T PANIC \|\|\|\|\|\|\|\|\|\|

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