hi guys,
its been long but this time i'm here again with this.
I mean with this circuit i found from Matsoft free schemes
I wonder if this thing works, and if so
what might be its recommended components, becuase I think
its supply rails are just very high for the diff amps.
regards,
hienrich
(thanks to DX, AKSA, and every one who helped me with my last thread,
People, you helped me and every one in the thread a lot. )
Attachments
I think this member can help you about this schematic !
http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=33092
http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=33092
Hi !
I am sorry to say this... This circuit is "horrible"...
A symetrical diffamp without any RE's at this supplylevel
is deadly thermal unstable. Also the vas is missing ANY RE.
It's very likely that this does not really work.
Also it has only 300watts into 8ohm. When connected to 8ohms
it's likely to blow. At 4ohms it will blow. You need at least 3 or 4
times the outputdevices on a BIG heatsink.
The diffampbjts with to92 will already be above 40°, the bias in
vas is only defined by temperature of devices.
If this is your first amp to build, try something smaller, like +/- 24v,
just for learning...
Mike
I am sorry to say this... This circuit is "horrible"...
A symetrical diffamp without any RE's at this supplylevel
is deadly thermal unstable. Also the vas is missing ANY RE.
It's very likely that this does not really work.
Also it has only 300watts into 8ohm. When connected to 8ohms
it's likely to blow. At 4ohms it will blow. You need at least 3 or 4
times the outputdevices on a BIG heatsink.
The diffampbjts with to92 will already be above 40°, the bias in
vas is only defined by temperature of devices.
If this is your first amp to build, try something smaller, like +/- 24v,
just for learning...
Mike
I think this thread is about the same amp design.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=25317
He states that more output devices need to be added...
I take it the concensus here is that it is still not a good design?
Bean
http://www.diyaudio.com/forums/showthread.php?s=&threadid=25317
He states that more output devices need to be added...
I take it the concensus here is that it is still not a good design?
Bean
You want something that works?
Got a TIFF viewer? Go to:
http://patft.uspto.gov/netacgi/nph-...,387,876.WKU.&OS=PN/5,387,876&RS=PN/5,387,876
and click on 'images'.
That output stage with ±95V will drive 1KW into 2R, two bridged on ±80V or so will drive 1600W into 4R.
Use the Leach front end.
Outputs = MJ21193/94
Drivers = MJL1302/3281
Use two 30-0-30 1KVA (or bigger) in series to get the correct voltages.
Got a TIFF viewer? Go to:
http://patft.uspto.gov/netacgi/nph-...,387,876.WKU.&OS=PN/5,387,876&RS=PN/5,387,876
and click on 'images'.
That output stage with ±95V will drive 1KW into 2R, two bridged on ±80V or so will drive 1600W into 4R.
Use the Leach front end.
Outputs = MJ21193/94
Drivers = MJL1302/3281
Use two 30-0-30 1KVA (or bigger) in series to get the correct voltages.
Superleach maybe ?
I will never design an amp with these voltages, 190volts are lethal...
I would suggest something with ccs feeding the diffamps and a
vbemutliplier for nice and stable biasing.
Superleach has this all and also shortcircuitprotection.
Maybe i have seen too many detonating devices already...
Mike
I will never design an amp with these voltages, 190volts are lethal...
I would suggest something with ccs feeding the diffamps and a
vbemutliplier for nice and stable biasing.
Superleach has this all and also shortcircuitprotection.
Maybe i have seen too many detonating devices already...
Mike
"Superleach maybe ?"
Those experienced in the art will recognize the Sondermeyer patent I linked to is the same output stage as the Superleach with a couple of extras: one more set of outputs for 2 ohm operation, and the or-ing diodes for improving efficency with a tiered supply.
"I will never design an amp with these voltages, 190volts are lethal..."
Leach designed the Heathkit AA1800, it runs on even higher voltages.
The 100W power envelope NAD 2200, 2400, and 2600 all run on higher voltages, as does the 200W Carver M1.0T and the M1.5T, etc.
"I would suggest something with ccs feeding the diffamps"
What do you think a resistor to a regulated voltage is? This is what Leach uses (and McIntosh, etc).
"and a vbemutliplier for nice and stable biasing."
Why does Leach use a four diode stack with a Vbe transistor then?
"Superleach has this all and also shortcircuitprotection."
The Sondermeyer patent also has the same current sense lines.
"Maybe i have seen too many detonating devices already..."
No comment.
Those experienced in the art will recognize the Sondermeyer patent I linked to is the same output stage as the Superleach with a couple of extras: one more set of outputs for 2 ohm operation, and the or-ing diodes for improving efficency with a tiered supply.
"I will never design an amp with these voltages, 190volts are lethal..."
Leach designed the Heathkit AA1800, it runs on even higher voltages.
The 100W power envelope NAD 2200, 2400, and 2600 all run on higher voltages, as does the 200W Carver M1.0T and the M1.5T, etc.
"I would suggest something with ccs feeding the diffamps"
What do you think a resistor to a regulated voltage is? This is what Leach uses (and McIntosh, etc).
"and a vbemutliplier for nice and stable biasing."
Why does Leach use a four diode stack with a Vbe transistor then?
"Superleach has this all and also shortcircuitprotection."
The Sondermeyer patent also has the same current sense lines.
"Maybe i have seen too many detonating devices already..."
No comment.
I was not able to look at the sondermeyer as i refused to install flash-plugin...
But i refered to the amp linked to in the other thread. Maybe you
should take closer look to postings ?
There is not mentioned a regulated voltagesupply.
I will never design something with these high voltages and let other
build this, i'm not willing to take over this responsibilty.
I am talking about DIY with these voltages...
What does the term "vbe-transistor" tell you ? Even adding
diodes, it's still a vbe-multiplier...
And... why do you hate me ?
But i refered to the amp linked to in the other thread. Maybe you
should take closer look to postings ?
There is not mentioned a regulated voltagesupply.
I will never design something with these high voltages and let other
build this, i'm not willing to take over this responsibilty.
I am talking about DIY with these voltages...
What does the term "vbe-transistor" tell you ? Even adding
diodes, it's still a vbe-multiplier...
And... why do you hate me ?
"I was not able to look at the sondermeyer as i refused to install flash-plugin..."
I don't have flash either.
PTO's full-page images are stored in an image file format called "TIFF," using CCITT Group 4 compression. This is the format which is required by the international standards to which all patent offices must conform. TIFF is also the most used lossless image format in the world.
I use a TIFF program.
"I will never design something with these high voltages and let other
build this, i'm not willing to take over this responsibilty.
I am talking about DIY with these voltages..."
95V is high? If you say so. No tubes for you.
"Even adding
diodes, it's still a vbe-multiplier..."
Not when the transistor has no contact with the heatsink and is only there to amplify the voltage drop in the diode string (which is in contact with the heatsink).
"And... why do you hate me ?"
LOL
"But i refered to the amp linked to in the other thread. Maybe you
should take closer look to postings ?
There is not mentioned a regulated voltagesupply."
I figure those are 'euro watts' or 'aussie watts' that can only be realized by regulated supplies or in short tonebursts.
Since RMS volts times RMS amps is 'average power' (RMS watts being an american folly), I am willing to give the AKSA the 'average power' stamp of approval.
I don't have flash either.
PTO's full-page images are stored in an image file format called "TIFF," using CCITT Group 4 compression. This is the format which is required by the international standards to which all patent offices must conform. TIFF is also the most used lossless image format in the world.
I use a TIFF program.
"I will never design something with these high voltages and let other
build this, i'm not willing to take over this responsibilty.
I am talking about DIY with these voltages..."
95V is high? If you say so. No tubes for you.
"Even adding
diodes, it's still a vbe-multiplier..."
Not when the transistor has no contact with the heatsink and is only there to amplify the voltage drop in the diode string (which is in contact with the heatsink).
"And... why do you hate me ?"
LOL
"But i refered to the amp linked to in the other thread. Maybe you
should take closer look to postings ?
There is not mentioned a regulated voltagesupply."
I figure those are 'euro watts' or 'aussie watts' that can only be realized by regulated supplies or in short tonebursts.
Since RMS volts times RMS amps is 'average power' (RMS watts being an american folly), I am willing to give the AKSA the 'average power' stamp of approval.
But as I explained, does not apply to power.
I think Marantz coined the term to distance themselves from the IHF and 'peak-to-peak-to-next-week' power crowds that popped up in the late 60s, early 70s.
As far as I am concerned there are:
Car stereo watts
Computer speaker watts
and then there is 'average power'.
Here is one for you:
IHF Method 4% Duty Cycle Burst Power Bridged Mono
8 ohms 1350 W 4 ohms 2000 W
The amp in question is 280W average power into 8 ohms with both channels driven from 20hz~20Khz with less than 0.1% distortion (and this is a well respected name in pro power amplifiers no less).
I think Marantz coined the term to distance themselves from the IHF and 'peak-to-peak-to-next-week' power crowds that popped up in the late 60s, early 70s.
As far as I am concerned there are:
Car stereo watts
Computer speaker watts
and then there is 'average power'.
Here is one for you:
IHF Method 4% Duty Cycle Burst Power Bridged Mono
8 ohms 1350 W 4 ohms 2000 W
The amp in question is 280W average power into 8 ohms with both channels driven from 20hz~20Khz with less than 0.1% distortion (and this is a well respected name in pro power amplifiers no less).
djk said:
The term RMS power is a misleading one. It tells us nothing
about the ability of the amp to drive complex loads.
~280 W RMS into 8 tells us only that this amp is capable of
delivering about 70 volts peak.
In bridge mode this must be doubled to 140 volts peak.
Now if the amp is able to deliver the needed current without
heavy PSU loss this equals more than those 2000W into 4.
So IMHO number dropping is just marketing hype in any way,
even using the "most serious" term RMS.
Amplifiers are made primarily to amplify music (in most cases)
and even heavily compressed music has a crestfactor of 10dB.
So who the hell cares about RMS data?
Uli
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