Latest news about us and about our products - Spring 2008 issue 125th AES Convention, October 2-5 2008 Our Vice President, Jon Paul will attend the 125th AES Convention in San Francisco. Jon is proposing an interesting paper to be announced soon! Please contact us to arrange a brief visit at your booth to discuss Digital Audio transformers. Please visit http://www.aes.org/events/125/ 2008 RoHS Lead Free Policy As of 2008, we will discontinue lead containing parts (no suffix, e.g. SC937-02) and stock only lead free RoHS compliant parts (LF suffix, e.g. SC937-02LF). If you must have non-compliant parts, please order well in advance and at least 100 pcs per release. New Laboratory Capabilities In 2007, we upgraded the network analyzer and jitter measurement capabilities in our test laboratory. We added special 75 Ohm Transmission/Reflection sets and test fixtures for measuring the frequency response and return loss parameters of transformers with our HP 4195a Network/Spectrum analyzer. We now have an HP5372a Frequency and Time Interval Analyzer with 15 pS jitter capability, for use with our Induced Interference Jitter Histogram technique outlined in the AES 2001 paper. These instruments provide further improvements in our test data and future transformer optimization. SuperShielded™ Transformers Our SuperShielded™  SC947-02 is receiving wide use in high end Studio, Broadcast and High End HiFi equipment.  It is a highly optimized version of our SC937-02. The results of 5 years of R&D, these parts boast substantially lower shielded capacitance, lower aberration, and even wider bandwidth than our standard models. The primary-secondary shielded capacitance is only 0.5 pF. Common mode rejection is 50 dB at 60 MHz.  SuperShielded™ digital audio transformers are intended for critical applications in high resolution systems to 24 bits and 192 kHz, and for especially interference-prone environments such as broadcast, professional video and digital audio studio equipment. Dual-Zo™ Transformers Since their introduction in 2003, our Dual-Zo parts have been specified in applications where space is at a premium and both balanced and unbalanced connections are required. These two SMD parts interface to both balanced and unbalanced circuits by use of dual windings of different ratios. The SC939-06 is a shielded 1.2 : 1.0 : 1.2 ratio dual secondary part for applications interfacing a 110-ohm primary to both 75 and 110-ohm secondaries.; SC939-06 rated for sample rates from 32 kHz up to 192 kHz. Our SC939-07 transformer is shielded and has a turn ratio of 1.0 : 1.0 : 1.2. It is designed to couple a 75-ohm primary to both 75-ohm and 110-ohm secondaries. The SC939-07 is for use with all popular AES/EBU transmitters, receivers and transceivers, at sample rates from 32 kHz up to 192 kHz. SuperSplitter™ SC945-01 for 2-port applications This part interfaces a 110 Ohm input to a pair of 110 Ohm outputs for interfacing one source to 2 loads. It provides the best performance in an AES/EBU splitter, with optimal bandwidth and low pulse aberration for sample rates 32 kHz to 192 kHz. SC945-01 has 1.4:1:1 ratio. Extremely wide bandwidth, low aberration, and high cross-port rejection characterize this unique device. RoHS Lead-Free Transformers The EU and Japanese deadline for compliance with RoHS environmental regulations was 1 July 2006. Scientific Conversion is proud to introduce our line of lead-free, RoHS compliant products. These are identical to our existing line, but are lead free and fully RoHS/WEEE compliant. These parts have an "LF" part number suffix e.g. SC937-02LF. We have switched most  production  to the lead free compliant process. The Lead Free page on this site has an FAQ to explain the issues. Please contact us if you have not already started to specify our Lead Free parts! SC Transformers Rated to 192 kHz Our SMD transformers SC979-03, SC982-04, SC961-04, SC939-06, SC939-07, SC945-01 and SC947-02 are all rated for sample rates up to 192 kHz. The remaining SMD parts, SC937-02 and; SC983-05 are useable at 192 kHz but are optimized up to 96 kHz. June 2007 Digital Audio History Talks  Cipher Machines, Computers, and Digital Audio:  Some Pale Gleams from the Past A Historical Perspective on the Enigma Machine, WWII Speech Scramblers, and the Foundations of Modern Computing and Digital Audio. Jon Paul gave a series of talks in Europe: at Bletchley Park for the UK AES section, at the Musée de l'Armée, Invalides, Paris, and for the Swiss AES Section at the Studer facility in Regensdorf. Jon's talk included 100 PowerPoint slides, a demonstration of a WWII Enigma machine and exclusive sounds of the top secret WWII speech scrambler used by Churchill. His multimedia presentation included WWII posters and music from that era. 121st AES Convention Oct. 2006 Our Vice President, Jon Paul gave a unique paper at the Signal Processing Session,  P13-8 (AES preprint #6930). The Origins of DSP and Compression: Some Pale Gleams from the Past A Historical Perspective on early speech synthesis and scramblers, and the Foundations of Digital Audio. We explored the history that led to modern day DSP and Compression. The roots of audio compression sprang from Dudley's 1930s Vocoder and the WWII speech scrambler, SIGSALY. We highlighted these key inventions, detailed their hardware and block diagrams, described how they functioned, and illustrated their relationship to modern day DSP and compression algorithms.  (Signal Processing Session, Preprint #6930) EMI/CM Noise Paper Presented at 115th NY AES We have presented a; technical paper at the 115th AES Convention in Oct. 2003: "The Effects and Reduction of Common-Mode Noise and Electromagnetic Interference in High-Resolution Digital Audio Transmission” This landmark paper completes over 12 years of research and development in this area. It was presented at the High Resolution Audio Session. To view a summary or download a PDF copy of this paper, please go to the "2003 AES Paper" button on the left. The AES preprint is # 5879. Clock Jitter Paper at AES 111th Convention Our Vice President, Jon Paul presented a; technical paper at the New York AES 2001: "Characterizing Digital Audio Transformers with Induced Jitter Histograms”. For a preview or copy, please go to the "2001 AES Paper" button on the left.; The AES preprint is # 5448. Enigma Talk given at Bletchley Park for UK AES Section The Journal of the AES December 2002 issue (News of the Sections,; p. 1102) reports on a Powerpoint talk and demonstration given by Jon Paul on 13 June 2002 for the UK section of the AES, including How Does It Work, Operating Methods, Cracking Enigma, The Polish Solutions, German Counter-Measures, Enigma & Computers, "Bombes" etc.; Please let us know if this topic is of interest to you.; Click here to see the review! Copyright © 2007 Scientific Conversion, Inc. All rights reserved. Information subject to change without notice. THE BEST TRANSFORMERS IN THE INDUSTRY! 15 April, 2008