Phono Pre-amp

Here are notes on the Jung super supply for audio. Does NOT show complementary side.

http://tangentsoft.net/elec/opamp-linreg.html

The link to the Jung website pages is at...
http://waltjung.org/Regs.html

The 2000 regulators are at http://waltjung.org/PDFs/Improved_PN_Regs.pdf

Labels: Super Power Supply

Transformer design book.

http://books.google.com/books?id=-am3B_psKFoC&pg=PT22&lpg=PT22&dq=c+cores&source=bl&ots=xXrEz1DXdn&sig=ZQm2EzhzVWq79jmbmPUW4IVjZ9Q#PPT27,M1

Transformer and Inductor Design Handbook By Colonel William T. McLyman, William T. McLyman

Basic Phono Preamp design and kit is the Hagerman "Bugle" pre-amp.

http://www.hagtech.com/bugle.html

Features three op amps. It's an excellent basis for a circuit.

Top of the line RIAA phono pre-amp aimed at vinyl to CD restoration:

http://www.tdl-tech.com/data4010.htm

UltraFast Recovery Diodes:
Low noise rectifiers for power supplies.

To help minimize radiated RF the audio community is turning to ultrafast recover diodes. These are diodes with a maximum reverse recovery time Tj of 500 microsec. But more typical values are in the sub 100 micro sec range.

Typical of these is the MUR series. These are produced by Vishay and ON. Mouser carries Visha, and Digikey carries ON.

http://www.onsemi.com/pub/Collateral/MUR120-D.PDF

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MUR120RLGOSCT-ND
Minimum qty at Digikey is 10 units for $3.70.

Bryston (Canada) puts 10nf / 150v caps across each diode to supress switching transients. Probably a good idea.
Digikey stocks Panasonic...
P4549A-ND
ECQ-B2103JF
CAP .01UF 200V B SERIES POLY
Panasonic - ECG
0.01µF

Toroid Transformer for Preamps

1. This xformer really hits the requirements for a phono preamp power transformer.

http://www.allelectronics.com/cgi-bin/item/TTX-7812/790/TOROIDAL_TRANSFORMER,_7.8VAC_6.3A,_25.2VCT_2.2A_.html

Ordered 2 on Feb 9, 2007 Arrived Feb 14, 2007 from Allelectronics

Connectors: The primarys use a Molex/Waldom 0.062 round pin connector.
The plug with female pins is on the transformer.

The primaries are on a 6 pin receptacle. This is in the catalog. Molex 03-06-2061. This part requires male crimp pins. 03-06-206.

Pin 1 A-0
Pin 2 A-100
Pin 3 A-120
Pin 4 B-0
Pin 5 B-100
Pin 6 B-120

Perfect match parts are not available from distributors for the 5 pin header on the secondaries. Molex recommends some other parts like part numbers 26-60-4050 and 26-60-5050.

Pin outs on the secondaries are:
Pin 1 A-0
Pin 2 A-7.6V
Pin 3 B-12.6
Pin 4 B-0
Pin 5 B-12.6

2. This may be the same transformer as this one from Herbach and Rademan

http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_Code=TM00XFR4409&Category_Code=XFR

Links to National Semiconductor audio parts:
Op Amps, Voltage References, Analog Amps

High Quality Preamps
Single Amp LME49710 http://www.national.com/pf/LM/LME49710.html
Dual Amp LM4562 OR LME49720 http://www.national.com/pf/LM/LME49720.html
Data Sheet LM4562 http://www.national.com/ds/LM/LM4562.pdf

High Voltage Version (22v rails)
Single LME49870 http://www.national.com/pf/LM/LME49870.html
Dual LME49860 http://www.national.com/pf/LM/LME49860.html
Data Sheet http://www.national.com/ds/LM/LME49860.pdf

Low Noise Voltage Reference
LM4140 http://www.national.com/pf/LM/LM4140.html
Data Sheet http://www.national.com/ds/LM/LM4140.pdf

Audio Buffer (Headphone Driver)
LME49600 http://www.national.com/pf/LM/LME49600.html?this=m5
Data Sheet http://www.national.com/ds/LM/LME49600.pdf

Preamp Application Notes
Phono Preamp Schematic and Eval Board Notes
(Joe Curcio's paper, "Keeping Up with the Demands of High Performance Audio," National App Note 1651.
http://www.national.com/an/AN/AN-1651.pdf

Overture Power Amps
Reference Page http://www.national.com/cat/index.cgi?i=i//286

LM1876 Info Page http://www.national.com/mpf/LM/LM1876.html#Datasheet
Data Sheet http://www.national.com/ds/LM/LM1876.pdf

New part in family.... LME49990. Super low noise but SOIC only.

Op amp phono preamp with jfet front end.

[PDF]
TheLP797Ultra-Low DistortionPhonoPreamp
File Format: PDF/Adobe Acrobat - View as HTMLfiltering/DC blocking. From 100Hz to. 20kHz, the response variations of both ..... diode. 1N4001. DK. D2, D3. zener, 12V, 1W. 1N4742A. DK. 1N4742ADICT ...www.audioxpress.com/magsdirx/ax/addenda/media/colin2774.pdf

Notes on Power Supply Construction...

Check out this book
http://www.amazon.com/Fundamentals-Electronics-Second-Robert-Erickson/dp/0792372700/ref=sr_11_1?ie=UTF8&qid=1202702014&sr=11-1

Advanced text on power supplies. Contains chapter on line conditioning.
LC Catalog is: TK7881.15 .E75 1997 (First Edition)
In Seattle University and UW Engineering libraries.

Note on blocking DC from toroidal transformers.

Notes referenced in diyaudio...
http://www.tnt-audio.com/clinica/mains_e.html
Low capacitor unit consisting of 8uf cap, MOV, and 220K 2 watt resistor. Nice.

Common mode choke.

L2 is a common mode toroid choke. C 2 and C4 are filter/load capacitors between the DC rails. These are polypro, AC, "refridgerator" style caps with low ESR.

C4 and C5 are good quality bypass caps.

A common mode choke is used after the transformer to limit 120 hz and 60 hz hum on the line. The filter also helps eliminate high frequency noise and EMI.

With carefully chosen values, this could be viewed as an LC Pi filter.

Part maker is CWS Coils. http://www.coilws.com/toroidal/CM_Series_toroidal_c_choke.php

Design notes are at: http://www.metglas.com/design/d2.asp?download=cmc.exe
From the metglas design site, it appears that a 1" diameter size core made of K series finemet
(part number K2313D in the FT-3km series) would do well without about 20-25 turns per side.
Wire size can be AWG22 or 24.
The schematic is from a Nemic-Lambda article. http://www.nemic.co.il/doc/PS4.pdf