Nelson, wow - great and simple job - real zen, I like that.
But.....
The inputimpedance is about 600 ohm, and that is a hard one to beat for most preamps, but if it can - then I am shure this darling will sing a nice song.
If you run this thing with BZLS you will loose > 1/2 the gain, your signal will be half vay down with a pot at 10k at the output 10% down, and you will need to change the output caps to a value > 100uF to get a reasonable lowend roll off.
Make this thing bridged and run it with an X´d version of the BZLS, which can be made with an outputimpedance <100 ohm.
I bed it will sound good.
May bee Zenmaster Pass has an better idea for a preamp or anoter point of view?.
Or X it like the Aleph-X, it seems easy, in the sim at least.
Unfortunately I am so so busy, I can´t make any DIY
at the moment.
Regards to all
But.....
The inputimpedance is about 600 ohm, and that is a hard one to beat for most preamps, but if it can - then I am shure this darling will sing a nice song.
If you run this thing with BZLS you will loose > 1/2 the gain, your signal will be half vay down with a pot at 10k at the output 10% down, and you will need to change the output caps to a value > 100uF to get a reasonable lowend roll off.
Make this thing bridged and run it with an X´d version of the BZLS, which can be made with an outputimpedance <100 ohm.
I bed it will sound good.
May bee Zenmaster Pass has an better idea for a preamp or anoter point of view?.
Or X it like the Aleph-X, it seems easy, in the sim at least.
Unfortunately I am so so busy, I can´t make any DIY
at the moment.Regards to all
The input impedance is somewhat higher than whatever the
input resistor is. 600 ohm is a probable figure with the 475 ohm
resistor.
If driving it with a Zen linestage, BOZ for BOSOZ (should have
called it SOB) then the naturally high output impedance of the
linestage forms the value of R1 for you, and you can short
across R1 if you like (or not...).
In my experience BOZ and BOSOZ are adequate to the task,
and if they are not, figure on boosting their supply values.
input resistor is. 600 ohm is a probable figure with the 475 ohm
resistor.
If driving it with a Zen linestage, BOZ for BOSOZ (should have
called it SOB) then the naturally high output impedance of the
linestage forms the value of R1 for you, and you can short
across R1 if you like (or not...).
In my experience BOZ and BOSOZ are adequate to the task,
and if they are not, figure on boosting their supply values.
NP and his crew:
great job on Zenv5!
I think i'm going for this one.
Just need a little help.
- Does this design need much dissipation, like Aleph 5? I has only two fets/ch so i suspect that heatsinking is not a big problem, wright?
maybe you coul post some pics of your runnig amp!!
- Is this amp a class AB design? and what about SOZ? is it too a class AB design in spite of being single ended? is there a difference in runnig in single ended / balanced mode in the amp class?
- can the inductors be home made and still produce a good result?
thanks,
great job on Zenv5!
I think i'm going for this one.
Just need a little help.
- Does this design need much dissipation, like Aleph 5? I has only two fets/ch so i suspect that heatsinking is not a big problem, wright?
maybe you coul post some pics of your runnig amp!!
- Is this amp a class AB design? and what about SOZ? is it too a class AB design in spite of being single ended? is there a difference in runnig in single ended / balanced mode in the amp class?
- can the inductors be home made and still produce a good result?
thanks,
1) Does this design need much dissipation, like Aleph 5? I has only two fets/ch so i suspect that heatsinking is not a big problem, right?
Heat sinking is a major issue
2) Is this amp a class AB design? and what about SOZ? is it too a class AB design in spite of being single ended? is there a difference in runnig in single ended / balanced mode in the amp class?
This is a Class A design, but could run beyond the Class A
point, which is not reflected in the curves in the article The
same is not true of SOZ, which cannot run beyond the bias
point.
3) Can the inductors be home made and still produce a good result?
Yes, of course.
Heat sinking is a major issue
2) Is this amp a class AB design? and what about SOZ? is it too a class AB design in spite of being single ended? is there a difference in runnig in single ended / balanced mode in the amp class?
This is a Class A design, but could run beyond the Class A
point, which is not reflected in the curves in the article The
same is not true of SOZ, which cannot run beyond the bias
point.
3) Can the inductors be home made and still produce a good result?
Yes, of course.
Nelson Pass said:
Is it sink bigger than Aleph 5? I need to make some cost calculations, since without the sinks, i'm reaching €600.00 both channels with regular components, and I spent €550.00 on aleph5 sinks$$$
Nelson Pass said:
Just in terms of design, this amp is very similar to a class AB configuration on a electronics book I have. I'm not an expert, so I might be mixing two different designs that just look similar.
is the resistors network arround the fets that make a difference between Class A and AB? in class A the fets should be "on" all the time right? so a push pull config doesn't allways mean that one fet is on and other is off ?
I also looked in the differential pairs section of the book and saw something like SOZ. In this config are both fets working side by side (allways conducting) or do they have a similar on/off behaviour?
Sorry about this basic questions, but I would like to end up with some knowledge AND an great amp
probably two per channel to be safe.
i run a stereo version of the ZEN amp on one
of those heatsinks and it gets quite HOT...
the Zen had each MOSFET dissipating 30 watts each. So all 4 of
them on one heatsink (like my ZEN) would be 120 watts total.
With the Zen 5:
at 30 volt rails you'll be dissipating 45 watts at each mosfet.
all 4 on one heatsink would be 180 watts! yikes. as you know
you can never have too much heatsink. And 30 volt rails are the
minimum we see in the graphs... you'd like to go a little higher
than that for th Z5...
so up the rails voltage and go with 2 R-Theta's per channel
i run a stereo version of the ZEN amp on one
of those heatsinks and it gets quite HOT...
the Zen had each MOSFET dissipating 30 watts each. So all 4 of
them on one heatsink (like my ZEN) would be 120 watts total.
With the Zen 5:
at 30 volt rails you'll be dissipating 45 watts at each mosfet.
all 4 on one heatsink would be 180 watts! yikes. as you know
you can never have too much heatsink. And 30 volt rails are the
minimum we see in the graphs... you'd like to go a little higher
than that for th Z5...
so up the rails voltage and go with 2 R-Theta's per channel
if i'm not mistaken the total watt dissipation of the zen v4 is more like 100W.
see this thread.
hope that helps.
/andrew
see this thread.
hope that helps.
/andrew
Cambe,
Sorry, my previous post was wrong. ONE 11"x11" R-Theta heat
sink will be fine for 1 channel of Zen 5. No matter which voltage
you decide to use for the rails (20, 25, or 30) and how much bias
you pick.
If i could i'd have that post deleted! Sorry for any confusion.
I think one of those R-Theta's will dissipate up to about 150 watts - although it will be running DANG HOT.
m. (promises to re-read posts before posting again)
Sorry, my previous post was wrong. ONE 11"x11" R-Theta heat
sink will be fine for 1 channel of Zen 5. No matter which voltage
you decide to use for the rails (20, 25, or 30) and how much bias
you pick.
If i could i'd have that post deleted! Sorry for any confusion.
I think one of those R-Theta's will dissipate up to about 150 watts - although it will be running DANG HOT.
m. (promises to re-read posts before posting again)
yeah...actually the 100W figure is for one channel. so, really big heatsinks.
cambe: i don't know what that aleph groupbuy heatsink looks like - but you can easily find a similar profile at aavid thermalloy's heatsink finder, and get the dissipation rating from there. that will tell you whether to use one or two per channel.
my uneducated guess is probably you should use two, but look it up to make sure.
/andrew
cambe: i don't know what that aleph groupbuy heatsink looks like - but you can easily find a similar profile at aavid thermalloy's heatsink finder, and get the dissipation rating from there. that will tell you whether to use one or two per channel.
my uneducated guess is probably you should use two, but look it up to make sure.
/andrew
... i e-mailed Camby, and think we got his question sorted out.
1 R-Theta (11"x11") should work well for one (1) channel of the
Zen version 5. I'm sorry my first reply was full of errors... it pays
to proof read one's posts... a little to eager to help.
It did get me to thinking that if you wanted to include the FETS
that are in the Power Supply - on that same heatsink - for a
monoblock, you may need to be a little careful. I didn't see in the
article where it mentioned how much heat they may be dissipating
depending on which voltage you aim for.
What is the formula for figuring the value of how much heat each
FET is dissipating in Watts? Bias voltage * Volts across the drains
of the source?
1 R-Theta (11"x11") should work well for one (1) channel of the
Zen version 5. I'm sorry my first reply was full of errors... it pays
to proof read one's posts... a little to eager to help.
It did get me to thinking that if you wanted to include the FETS
that are in the Power Supply - on that same heatsink - for a
monoblock, you may need to be a little careful. I didn't see in the
article where it mentioned how much heat they may be dissipating
depending on which voltage you aim for.
What is the formula for figuring the value of how much heat each
FET is dissipating in Watts? Bias voltage * Volts across the drains
of the source?
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