Projeto de Pré-amplificadores e Equalizadores RIAA Para Toca-Discos – Parte XVIII

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Válvulas

U1           1/2 12AX7             1/2 V1;

U2           1/2 12AX7             1/2 V2;

U3           1/2 6DJ8                1/2 V3;

U4           1/2 6DJ8                1/2 V4;

V1 e V2, 7025, 12AX7A, ECC803S ou 12AX7LPS, para menor nível de ruído.

V3 e V4, 6DJ8 ou 6922.

No próximo artigo, a fonte de alimentação e a montagem deste pré-amplificador.

Referências:

  1. Bohn, Dennis, editor. AUDIO HANDBOOK 1st ed. National Semiconductor Corporation; 1976.
  2. Holman, Tomlinson. AUDIO, “Dynamic Range Requirements of Phonographic Preamplifiers”, July 1977.
  3. Tomer, Robert B. ; Getting The Most Out of Vacuum Tubes, 1st ed. Howard W. Sams & Co. Inc.; 1960.
  4. Gray, Paul E.; Searle, Campbell L.; Princípios de Eletrônica, vol. 3, Circuitos Eletrônicos II; 1ª edição, Livros Técnicos e Científicos Editora S. A.; 1974.
  5. Zobel, O.J. (1923), Theory and Design of Uniform and Composite Electric Wave‐filters. Bell System Technical Journal, 2: 1-46. doi:10.1002/j.1538-7305.1923.tb00001.x (internet).
  6. Cauer, W, “Die Verwirklichung der Wechselstromwiderstände vorgeschriebener Frequenzabhängigkeit“,  Archiv für Elektrotechnik, vol 17, pp355–388, 1926. The realisation of impedances of prescribed frequency dependence (in German), (internet).
  7. Maloberti, Franco; Davies, Anthony C.; A Short History of Circuits and Systems. River Publishers, 2016.© IEEE 2016.
  8. Kuo, Frank F., Network Analysis and Synthesis, John Wiley & Sons, 1966.
  9. Daryanani, Gobind, Principles of Active Network Synthesis and Design, Bell Laboratories, John Wiley & Sons, 1976.
  10. Van Valkenburg, M. E., Introduction to Modern Network Synthesis, John Wiley & Sons, 1960.
  11. Tedeschi, Frank P.; The Active Filter Handbook, Tab Books, 1979.
  12. Stephenson, Frederick William; et al, RC Active Filter Handbook, John Wiley & Sons, 1985.
  13. Close, Charles M.; Circuitos Lineares, (The Analysis of Linear Circuits); tradução: Ana Lucia Serio de Almeida, José Abel Royo dos Santos e José Carlos Goulart de Siqueira (Escola Federal de Engenharia de Itajubá); Copyright © 1966 by Harcourt, Brace Jovanovitch, Inc.; Copyright © 1975 by LTC – Livros Técnicos e Científicos Editora S. A.
  14. Desoer, Charles A.; Kuh, Ernest S.; Teoria Básica de Circuitos (Basic Circuit Theory); tradução: Carlos Peres Quevedo; Copyright © 1969 by McGraw-Hill, Inc.; Copyright © 1979 Ed. Guanabara Dois.
  15. Texas Instruments, AN-346, High-Performance Audio Applications of The LM833, agosto de 1985, revisado em maio de 2013.
  16. Millet, Pete; LR Phono Preamps, disponível na internet em 21/09/2021, no endereço: http://www.pmillett.com/file_downloads/LR%20Phono%20Preamps.pdf
  17. Jones, Morgan; Valve Amplifiers, 3rd ed., 2003, Elsevier Ltd.
  18. Self, Douglas; Small Signal Audio Design, 1st ed., 2010, Focal Press.
  19. LM2596 SIMPLE SWITCHER©, 150kHz step down 3A Voltage Regulator datasheet, Texas Instruments, 1999-2013.
  20. Vogel, Burkhard; The Sound of Silence, 2008, Springer Verlag, Berlin, Heidelberg.
  21. Motchenbacher, C. D., Connelly, J. A., Low-Noise Electronic System Design; John Wiley & Sons, 1993.
  22. Alley, Charles L., Atwood, Kenneth W.; Electronic Engineering, 3rd ed., 1973, John Wiley & Sons, Inc.
  23. Spangenberg, Karl L., Vacuum Tubes; 1948, McGraw-Hill.
  24. Blencowe, Merlin, Noise in Triodes with Particular Reference to Phono Preamplifiers; AMS Neve Ltd Engineering Report, Journal of The Audio Engineering Society, Vol. 61, N° 11, novembro de 2013.
  25. Blencowe, Merlin, Designing Valve Preamps  for Guitar and Bass; 2nd ed., 2012, Wem Publishing.
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