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Re: Elektor supra artikel fra 1982

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Ser lige at de bruger 78L15 og 79L15. Prøv at erstatte disse
med LM317/337-varianter, som skulle støje _meget_ mindre.
Det kræver lige et par ekstra modstande.
Tip "stjålet" fra Elliot Sound Projects.

/Bo.



Re: Elektor supra artikel fra 1982
Hej Bo

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Jeg ville nok helt fjerne den spændingsforsyning og så sætte
en udgave af H D's støjsvage strømforsyning på.

--
Mvh Max



Re: Elektor supra artikel fra 1982
Hej Max
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Har du stadig tænkt på selv at lave et udlæg? Så kunne det jo være en rar
ting at få med.

Mvh Hauge



Re: Elektor supra artikel fra 1982
Hej Hauge

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Jeg tegner på det.

--
Mvh Max



Re: Elektor supra artikel fra 1982
Hej Brian

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Glæd dig over dit gode syn, mit syn var berygtet i mine unge
dage, til søs kunne jeg se ting de andre ikke engang kunne
se i kikkerten, hvilket ofte betød jeg blev vækket på frivagten
fordi der manglede en god udkik. Men husk at det ikke vare
evigt, du bliver også gammel og halvblind engang med tiden.

--
Mvh Max



Re: Elektor supra artikel fra 1982 [ alternativ RIAA? ]
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Hej!

Er nogen interesseret i en anden - måske bedre - RIAA forstærker?

hilsen

Glenn

Re: Elektor supra artikel fra 1982 [ alternativ RIAA? ]
Jeg er da altid interesseret i gode elektronik konstruktioner. Så bare kom
med diagram.
Supraén har rigtige gode tekniske data - og en lyd, som mange nyere RIAA
forstærkere ikke overgår.

Men jeg vil meget gerne se hvad det er for en RIAA du snakker om.

M.v.h.

CArsten

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Re: Elektor supra artikel fra 1982 [ alternativ RIAA? ]

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  Og hvis der er interesse så har jeg en konstruktion som slår de fleste. En
diskret opbygget RIAA med passiv RIAA kompensation og høj
forsyningsspænding. Denne RIAA kan gengive direkt skårne plader uden nogen
form for forvrængning. Har man hørt plader genngivet via denne RIAA så er
man helt færdig med CD'er



Re: Elektor supra artikel fra 1982 [ alternativ RIAA? ]

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Jeg er da også interesseret i denne konstruktion. Kan jeg få et diagram -
eller et link ?

C. Nielsen



Re: Elektor... [ "AIR", "Den komplette forforstæ rker", "Borborly~forstærkeren" ]
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Hej Carsten

Den er her:

"Den komplette forforstærker":

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 2.del",
     journal = "High Fidelity",
     pages = "76--78",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 3.del",
     journal = "High Fidelity",
     pages = "76--81",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 4.del",
     journal = "High Fidelity",
     pages = "79--82",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 5.del",
     journal = "High Fidelity",
     pages = "83--87",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren bliver aldrig færdig!",
     journal = "High Fidelity",
     pages = "33--33",
     year = "1984"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren - igen",
     journal = "High Fidelity",
     pages = "67--71",
     year = "1983",
     keywords = "BC413B BC415B BD419 BD420 2N4401 2N4403 LF356 BDX33B
BDX34B 7824 7924"
}

@article{,
     author = "Michael Madsen",
     title = "Mere om forforstærkeren: Nye transistorer",
     journal = "High Fidelity",
     pages = "34--35",
     year = "1984",
     keywords = "2SD786 2SB737"
}


-

Kan ikke huske om denne hører med i serien:

@article{,
     author = "Michael Madsen",
     title = "Mere RIAA",
     journal = "High Fidelity",
     pages = "37--37",
     year = "1984",
     keywords = "2SD786 2SB737"
}

-
-

AIR:

@article{,
     author = "Michael Madsen",
     title = "Mere RIAA",
     journal = "High Fidelity",
     pages = "37--37",
     year = "1984",
     keywords = "2SD786 2SB737"
}

@article{,
     author = "Michael Madsen",
     title = "Mere RIAA",
     journal = "High Fidelity",
     pages = "37--37",
     year = "1984",
     keywords = "2SD786 2SB737"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 3.del",
     journal = "High Fidelity",
     pages = "60--62",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

Her er RIAA-delens diagram og omtale. RIAA-forbetoningen er passiv og
forstærkerblokkene har ingen modkobling. DC-fejl fjernes med "One Point
DC Servo"er beskrevet i første del. Der er også en helt særlig MC
forforstærker:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 4.del",
     journal = "High Fidelity",
     pages = "36--39",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 5.del",
     journal = "High Fidelity",
     pages = "58--61",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 6.del",
     journal = "High Fidelity",
     pages = "16--18",
     year = "1993",
     keywords = "2SA1455K 2SC3722K"
}

-
-

Borborly~forstærkeren:

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 1. del.",
     journal = "High Fidelity",
     pages = "27--30",
     year = "1986"
}

@misc{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 2. del."
}

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 3. del.",
     journal = "High Fidelity",
     pages = "36--45",
     year = "1986"
}

-
-

Disse transistorer kunne nok have interesse til en MC/MM-forstærker:

diyAudio Forums Archive - Low noise transistor and noise figure:
http://www.diyaudio.com/forums/showthread/t-39680.html
Citat: "...
The lowest noise audio types i have ever seen are ROHM 2SA1455k and
2SC3722k they have a noise figure of just 0,2 dB. They are suitable for
normal line level impedances like 1 - 22k.
...
If we talk about it, SSM2210 and SSM2220 from Analog Devices are also OK
but they have other unwanted properties (you can't have it all)
...
There are also leaded versions of 2SA1455k / 2SC3722k, they are called
2SA1038 + 2SC2389.
...
Rohm is dicontinuing the A1038 & C2389. They want us to buy the SM versions.
...
I am looking at MAT01 noise specs. At first they appear not so
good with around 6nV/rt Hz (P2 data sheet), but on further
inspection this appears to be at 10uA (see top of page 2).
Comparing to the super low noise MAT02, at 10uA it is pretty
similar and acheives best noise specs at a few mA.

So does anyone know what the MAT01 specs at a few mA?
Or is the data sheet wrong?
...
What do you think about low noise transistor arrays made by THAT
Corporation.
THAT300 4xNPN
THAT320 4xPNP
THAT340 2xNPN [ +2xPNP ]
http://www.profusionplc.com
...
mandat! thanks you very much!
I can't say anything about lownoise and fT .325Mhz is a ultra high
frequency. fT of 2sc2240,2sc2362 and 2sc1815 is about 100Mhz
That 340 is very suite for building a symmetrical amp.But Beta is a
problem, about 60-100 is very low .
..."

Disse ser også gode ud, men er pakket ind med flere andre:

http://www.profusionplc.com/pro/gex/prodGen.html?prdtyp=transistor%20arrays
Citat: "...
When it comes to matched transistor arrays, you're not likely to find
any better than THAT Corporation's 300 series.
...
Their low base-spreading resistances and voltage noise under 1 nV/rt-Hz
make the 300 series ideal for low-noise amplifier input stages, among
other applications. Because they are fabricated in a dielectrically
isolated (DI), complementary bipolar process, each transistor is
electrically insulated from the others by a layer of insulating oxide
(and not the reverse-biased PN junctions used in conventional arrays).
*Consequently*, the THAT300 series exhibit inter-device crosstalk and DC
isolation similar to that expected from discrete transistors - *perfect*
for audio applications!
..."

når de nu selv skal skrive det...

-

Husk at det måske så er en god idé at anvende metalfilms modstande, da
de støjer lidt mindre end kulfilm...

hilsen

Glenn

Re: Elektor... [rev. "AIR", "Den komplette forforstærker", "Borbor ly~forstærkeren" ]
 > Jeg er da altid interesseret i gode elektronik konstruktioner. Så
bare kom med diagram.
 > Supraén har rigtige gode tekniske data - og en lyd, som mange nyere
RIAA forstærkere ikke overgår.
 >
 > Men jeg vil meget gerne se hvad det er for en RIAA du snakker om.
 >
 > M.v.h.
 >
 > CArsten

Hej Carsten

Den er her:

"Den komplette forforstærker":

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 2.del",
     journal = "High Fidelity",
     pages = "76--78",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 3.del",
     journal = "High Fidelity",
     pages = "76--81",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 4.del",
     journal = "High Fidelity",
     pages = "79--82",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 5.del",
     journal = "High Fidelity",
     pages = "83--87",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren bliver aldrig færdig!",
     journal = "High Fidelity",
     pages = "33--33",
     year = "1984"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren - igen",
     journal = "High Fidelity",
     pages = "67--71",
     year = "1983",
     keywords = "BC413B BC415B BD419 BD420 2N4401 2N4403 LF356 BDX33B
BDX34B 7824 7924"
}

@article{,
     author = "Michael Madsen",
     title = "Mere om forforstærkeren: Nye transistorer",
     journal = "High Fidelity",
     pages = "34--35",
     year = "1984",
     keywords = "2SD786 2SB737"
}


-

Kan ikke huske om denne hører med i serien:

@article{,
     author = "Michael Madsen",
     title = "Mere RIAA",
     journal = "High Fidelity",
     pages = "37--37",
     year = "1984",
     keywords = "2SD786 2SB737"
}

-
-

AIR:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 1.del",
     journal = "High Fidelity",
     pages = "58--59",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 2.del",
     journal = "High Fidelity",
     pages = "32--34",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 3.del",
     journal = "High Fidelity",
     pages = "60--62",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

Her er RIAA-delens diagram og omtale. RIAA-forbetoningen er passiv og
forstærkerblokkene har ingen modkobling. DC-fejl fjernes med "One Point
DC Servo"er beskrevet i første del. Der er også en helt særlig MC
forforstærker:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 4.del",
     journal = "High Fidelity",
     pages = "36--39",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 5.del",
     journal = "High Fidelity",
     pages = "58--61",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 6.del",
     journal = "High Fidelity",
     pages = "16--18",
     year = "1993",
     keywords = "2SA1455K 2SC3722K"
}

-
-

Borborly~forstærkeren:

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 1. del.",
     journal = "High Fidelity",
     pages = "27--30",
     year = "1986"
}

@misc{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 2. del."
}

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 3. del.",
     journal = "High Fidelity",
     pages = "36--45",
     year = "1986"
}

-
-

Disse transistorer kunne nok have interesse til en MC/MM-forstærker:

diyAudio Forums Archive - Low noise transistor and noise figure:
http://www.diyaudio.com/forums/showthread/t-39680.html
Citat: "...
The lowest noise audio types i have ever seen are ROHM 2SA1455k and
2SC3722k they have a noise figure of just 0,2 dB. They are suitable for
normal line level impedances like 1 - 22k.
....
If we talk about it, SSM2210 and SSM2220 from Analog Devices are also OK
but they have other unwanted properties (you can't have it all)
....
There are also leaded versions of 2SA1455k / 2SC3722k, they are called
2SA1038 + 2SC2389.
....
Rohm is dicontinuing the A1038 & C2389. They want us to buy the SM versions.
....
I am looking at MAT01 noise specs. At first they appear not so
good with around 6nV/rt Hz (P2 data sheet), but on further
inspection this appears to be at 10uA (see top of page 2).
Comparing to the super low noise MAT02, at 10uA it is pretty
similar and acheives best noise specs at a few mA.

So does anyone know what the MAT01 specs at a few mA?
Or is the data sheet wrong?
....
What do you think about low noise transistor arrays made by THAT
Corporation.
THAT300 4xNPN
THAT320 4xPNP
THAT340 2xNPN [ +2xPNP ]
http://www.profusionplc.com
....
mandat! thanks you very much!
I can't say anything about lownoise and fT .325Mhz is a ultra high
frequency. fT of 2sc2240,2sc2362 and 2sc1815 is about 100Mhz
That 340 is very suite for building a symmetrical amp.But Beta is a
problem, about 60-100 is very low .
...."

Disse ser også gode ud, men er pakket ind med flere andre:

http://www.profusionplc.com/pro/gex/prodGen.html?prdtyp=transistor%20arrays
Citat: "...
When it comes to matched transistor arrays, you're not likely to find
any better than THAT Corporation's 300 series.
....
Their low base-spreading resistances and voltage noise under 1 nV/rt-Hz
make the 300 series ideal for low-noise amplifier input stages, among
other applications. Because they are fabricated in a dielectrically
isolated (DI), complementary bipolar process, each transistor is
electrically insulated from the others by a layer of insulating oxide
(and not the reverse-biased PN junctions used in conventional arrays).
*Consequently*, the THAT300 series exhibit inter-device crosstalk and DC
isolation similar to that expected from discrete transistors - *perfect*
for audio applications!
...."

når de nu selv skal skrive det...

-

Husk at det måske så er en god idé at anvende metalfilms modstande, da
de støjer lidt mindre end kulfilm...

hilsen

Glenn

Re: Elektor... [rev.2 "AIR" , "Den komplette forforstærker", "Bor borly~forstærkeren" ]
 > Jeg er da altid interesseret i gode elektronik konstruktioner. Så
bare kom med diagram.
 > Supraén har rigtige gode tekniske data - og en lyd, som mange nyere
RIAA forstærkere ikke overgår.
 >
 > Men jeg vil meget gerne se hvad det er for en RIAA du snakker om.
 >
 > M.v.h.
 >
 > CArsten

Hej Carsten

De er her:

-
-

RIAA-delen i AIR:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 1.del",
     journal = "High Fidelity",
     pages = "58--59",
     month = "7,8",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 2.del",
     journal = "High Fidelity",
     pages = "32--34",
     month = "9",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 3.del",
     journal = "High Fidelity",
     pages = "60--62",
     month = "10",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

Her er RIAA-delens diagram og omtale. RIAA-forbetoningen er passiv og
forstærkerblokkene har ingen modkobling. DC-fejl fjernes med "One Point
DC Servo"er beskrevet i første del. Der er også en helt særlig MC
forforstærker:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 4.del",
     journal = "High Fidelity",
     pages = "36--39",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 5.del",
     journal = "High Fidelity",
     pages = "58--61",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 6.del",
     journal = "High Fidelity",
     pages = "16--18",
     year = "1993",
     keywords = "2SA1455K 2SC3722K"
}

-
-

RIAA-delen i "Den komplette forforstærker":

(1.del)

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 2.del",
     journal = "High Fidelity",
     pages = "76--78",
     month = "2",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 3.del",
     journal = "High Fidelity",
     pages = "76--81",
     month = "3",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 4.del",
     journal = "High Fidelity",
     pages = "79--82",
     month = "4",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 5.del",
     journal = "High Fidelity",
     pages = "83--87",
     month = "5",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren bliver aldrig færdig!",
     journal = "High Fidelity",
     pages = "33--33",
     month = "3",
     year = "1984"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren - igen",
     journal = "High Fidelity",
     pages = "67--71",
     month = "1",
     year = "1983",
     keywords = "BC413B BC415B BD419 BD420 2N4401 2N4403 LF356 BDX33B
BDX34B 7824 7924"
}

@article{,
     author = "Michael Madsen",
     title = "Mere om forforstærkeren: Nye transistorer",
     journal = "High Fidelity",
     pages = "34--35",
     month = "1",
     year = "1984",
     keywords = "2SD786 2SB737"
}

@article{,
     author = "Michael Madsen",
     title = "Mere RIAA",
     journal = "High Fidelity",
     pages = "37--37",
     month = "3",
     year = "1984",
     keywords = "2SD786 2SB737"
}

-
-

Borborly~forstærkerens RIAA-del:

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 1. del.",
     journal = "High Fidelity",
     pages = "27--30",
     month = "3",
     year = "1986"
}

@misc{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 2. del."
}

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 3. del.",
     journal = "High Fidelity",
     pages = "36--45",
     month = "6",
     year = "1986"
}

-
-

Disse transistorer kunne nok have interesse til en MC/MM-forstærker:

diyAudio Forums Archive - Low noise transistor and noise figure:
http://www.diyaudio.com/forums/showthread/t-39680.html
Citat: "...
The lowest noise audio types i have ever seen are ROHM 2SA1455k and
2SC3722k they have a noise figure of just 0,2 dB. They are suitable for
normal line level impedances like 1 - 22k.
.....
If we talk about it, SSM2210 and SSM2220 from Analog Devices are also OK
but they have other unwanted properties (you can't have it all)
.....
There are also leaded versions of 2SA1455k / 2SC3722k, they are called
2SA1038 + 2SC2389.
.....
Rohm is dicontinuing the A1038 & C2389. They want us to buy the SM versions.
.....
I am looking at MAT01 noise specs. At first they appear not so
good with around 6nV/rt Hz (P2 data sheet), but on further
inspection this appears to be at 10uA (see top of page 2).
Comparing to the super low noise MAT02, at 10uA it is pretty
similar and acheives best noise specs at a few mA.

So does anyone know what the MAT01 specs at a few mA?
Or is the data sheet wrong?
.....
What do you think about low noise transistor arrays made by THAT
Corporation.
THAT300 4xNPN
THAT320 4xPNP
THAT340 2xNPN [ +2xPNP ]
http://www.profusionplc.com
.....
mandat! thanks you very much!
I can't say anything about lownoise and fT .325Mhz is a ultra high
frequency. fT of 2sc2240,2sc2362 and 2sc1815 is about 100Mhz
That 340 is very suite for building a symmetrical amp.But Beta is a
problem, about 60-100 is very low .
....."

Disse transistorer ser også gode ud, men er pakket ind med flere andre:

http://www.profusionplc.com/pro/gex/prodGen.html?prdtyp=transistor%20arrays
Citat: "...
When it comes to matched transistor arrays, you're not likely to find
any better than THAT Corporation's 300 series.
.....
Their low base-spreading resistances and voltage noise under 1 nV/rt-Hz
make the 300 series ideal for low-noise amplifier input stages, among
other applications. Because they are fabricated in a dielectrically
isolated (DI), complementary bipolar process, each transistor is
electrically insulated from the others by a layer of insulating oxide
(and not the reverse-biased PN junctions used in conventional arrays).
*Consequently*, the THAT300 series exhibit inter-device crosstalk and DC
isolation similar to that expected from discrete transistors - *perfect*
for audio applications!
....."

når de nu selv skal skrive det...

-

Husk at det måske så er en god idé at anvende metalfilms modstande, da
de støjer lidt mindre end kulfilm...

hilsen

Glenn

Re: Elektor... [rev.3 "AIR" , "Den komplette forforstærker", "Bor borly~forstærkeren" ]
 > Jeg er da altid interesseret i gode elektronik konstruktioner. Så
bare kom med diagram.
 > Supraén har rigtige gode tekniske data - og en lyd, som mange nyere
RIAA forstærkere ikke overgår.
 >
 > Men jeg vil meget gerne se hvad det er for en RIAA du snakker om.
 >
 > M.v.h.
 >
 > CArsten

Hej Carsten

De er her:

-
-

RIAA-delen i AIR:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 1.del",
     journal = "High Fidelity",
     pages = "58--59",
     month = "7,8",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 2.del",
     journal = "High Fidelity",
     pages = "32--34",
     month = "9",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 3.del",
     journal = "High Fidelity",
     pages = "60--62",
     month = "10",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

Her er RIAA-delens diagram og omtale. RIAA-forbetoningen er passiv og
forstærkerblokkene har ingen modkobling. DC-fejl fjernes med "One Point
DC Servo"er beskrevet i første del. Der er også en helt særlig MC
forforstærker:

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 4.del",
     journal = "High Fidelity",
     pages = "36--39",
     month = "11",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 5.del",
     journal = "High Fidelity",
     pages = "58--61",
     month = "12",
     year = "1992",
     keywords = "2SA1455K 2SC3722K"
}

@article{,
     author = "Lars H. Clausen, John Madsen",
     title = "AIR 6.del",
     journal = "High Fidelity",
     pages = "16--18",
     month = "11",
     year = "1993",
     keywords = "2SA1455K 2SC3722K"
}

-
-

RIAA-delen i "Den komplette forforstærker":

(1.del)

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 2.del",
     journal = "High Fidelity",
     pages = "76--78",
     month = "2",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 3.del",
     journal = "High Fidelity",
     pages = "76--81",
     month = "3",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 4.del",
     journal = "High Fidelity",
     pages = "79--82",
     month = "4",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Den komplette forforstærker 5.del",
     journal = "High Fidelity",
     pages = "83--87",
     month = "5",
     year = "1983"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren bliver aldrig færdig!",
     journal = "High Fidelity",
     pages = "33--33",
     month = "3",
     year = "1984"
}

@article{,
     author = "Michael Madsen",
     title = "Forforstærkeren - igen",
     journal = "High Fidelity",
     pages = "67--71",
     month = "1",
     year = "1983",
     keywords = "BC413B BC415B BD419 BD420 2N4401 2N4403 LF356 BDX33B
BDX34B 7824 7924"
}

@article{,
     author = "Michael Madsen",
     title = "Mere om forforstærkeren: Nye transistorer",
     journal = "High Fidelity",
     pages = "34--35",
     month = "1",
     year = "1984",
     keywords = "2SD786 2SB737"
}

@article{,
     author = "Michael Madsen",
     title = "Mere RIAA",
     journal = "High Fidelity",
     pages = "37--37",
     month = "3",
     year = "1984",
     keywords = "2SD786 2SB737"
}

-
-

Borborly~forstærkerens RIAA-del:

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 1. del.",
     journal = "High Fidelity",
     pages = "27--30",
     month = "3",
     year = "1986"
}

@misc{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 2. del."
}

@article{,
     author = "Erno Borbely",
     title = "Borborly~forstærkeren. Konstruktion: 3. del.",
     journal = "High Fidelity",
     pages = "36--45",
     month = "6",
     year = "1986"
}

-
-

Disse transistorer kunne nok have interesse til en MC/MM-forstærker:

diyAudio Forums Archive - Low noise transistor and noise figure:
http://www.diyaudio.com/forums/showthread/t-39680.html
Citat: "...
The lowest noise audio types i have ever seen are ROHM 2SA1455k and
2SC3722k they have a noise figure of just 0,2 dB. They are suitable for
normal line level impedances like 1 - 22k.
......
If we talk about it, SSM2210 and SSM2220 from Analog Devices are also OK
but they have other unwanted properties (you can't have it all)
......
There are also leaded versions of 2SA1455k / 2SC3722k, they are called
2SA1038 + 2SC2389.
......
Rohm is dicontinuing the A1038 & C2389. They want us to buy the SM versions.
......
I am looking at MAT01 noise specs. At first they appear not so
good with around 6nV/rt Hz (P2 data sheet), but on further
inspection this appears to be at 10uA (see top of page 2).
Comparing to the super low noise MAT02, at 10uA it is pretty
similar and acheives best noise specs at a few mA.

So does anyone know what the MAT01 specs at a few mA?
Or is the data sheet wrong?
......
What do you think about low noise transistor arrays made by THAT
Corporation.
THAT300 4xNPN
THAT320 4xPNP
THAT340 2xNPN [ +2xPNP ]
http://www.profusionplc.com
......
mandat! thanks you very much!
I can't say anything about lownoise and fT .325Mhz is a ultra high
frequency. fT of 2sc2240,2sc2362 and 2sc1815 is about 100Mhz
That 340 is very suite for building a symmetrical amp.But Beta is a
problem, about 60-100 is very low .
......"

Disse transistorer ser også gode ud, men er pakket ind med flere andre:

http://www.profusionplc.com/pro/gex/prodGen.html?prdtyp=transistor%20arrays
Citat: "...
When it comes to matched transistor arrays, you're not likely to find
any better than THAT Corporation's 300 series.
......
Their low base-spreading resistances and voltage noise under 1 nV/rt-Hz
make the 300 series ideal for low-noise amplifier input stages, among
other applications. Because they are fabricated in a dielectrically
isolated (DI), complementary bipolar process, each transistor is
electrically insulated from the others by a layer of insulating oxide
(and not the reverse-biased PN junctions used in conventional arrays).
*Consequently*, the THAT300 series exhibit inter-device crosstalk and DC
isolation similar to that expected from discrete transistors - *perfect*
for audio applications!
......"

når de nu selv skal skrive det...

-

Husk at det måske så er en god idé at anvende metalfilms modstande, da
de støjer lidt mindre end kulfilm...

hilsen

Glenn

Re: Elektor... [rev.3 "AIR", "Den komplette forforstærker", "Borborly~forstærkeren" ]

(cut)
.
Quoted text here. Click to load it

De har ret. Det er uovertrufne stumper.
Quoted text here. Click to load it

Jahaah - men en 1K metalfilm støjer ca. 3nV/sqrt(Hz) iflg. min
tommelfinger. Så man skal lige regne på tingene.


Re: Elektor supra artikel fra 1982 [ Erno Borbely RIAA byggesæt... ]
Quoted text here. Click to load it

Hej Carsten

Sørme om ikke Erno Borbely har fået lavet sit eget site - byggesættene
har ingen WAF effekt - så du må selv pakke dem ind i pæne kabinetter:

http://www.borbelyaudio.com /

http://www.borbelyaudio.com/products.asp
Citat: "...
No bipolar device, not even the LM394, is coming close as far as
resolution is concerned. Some tubes are excellent in terms of
resolution, but they can not match the low noise and neutrality of the JFETs
...
Top-of-the-Line Kits

EB-199/320 All-FET MM/MC Phono Preamp
...
Low cost
...
EB-804/419 ALL-JFET MM/ MC Phono Preamp w/ Regulators
...
High performance
...
Pre Amplifiers

EB-707/432 Low-cost All-FET MM/MC Phono Preamp
...
Select Kits
...
SE Tube Kits
# EB-1195/221 Hybrid JFET/TUBE MC/MM Phono preamp
..."

hilsen

Glenn

Re: Elektor supra artikel fra 1982 [ bl.a. om hifi design ]
Quoted text here. Click to load it

Hej Carsten

Dette site har rigtig god information om hi-fi design generelt.

Douglas Self: The Amplifier Institute:
http://www.dself.dsl.pipex.com/ampins/ampins.htm

Op-amp design:
http://www.dself.dsl.pipex.com/ampins/webbop/opamp.htm
Citat: "...The Red Text of Shame for the 741 emphasises that this is not
fast enough to give full output over the audio band..."

Science and Subjectivism in Audio:
http://www.dself.dsl.pipex.com/ampins/pseudo/subjectv.htm

hilsen

Glenn

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