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[[File:Tim Orr, in the London College of Furniture's 16-track music studio.jpg|thumb|right|400px|Tim Orr in the London College of Furniture's 16-track music studio.]]'''Tim Orr''' designed synthesizers for [[EMS Ltd.]], Akai and later synthesizer projects for [[Electronics Today International]] magazine, sold as [[kit]]s by [[Powertran Electronics|Powertran]], he then went on to lecture on electronic instrument design at the London College of Furniture.<!-- a predecessor of The Cass at London Metropolitan University --><ref>[https://worldradiohistory.com/hd2/IDX-UK/Technology/Technology-All-Eras/Archive-Wireless-World-IDX/80s/Wireless-World-1981-06-OCR-Page-0087.pdf Powetran advert], Wireless World, June 1981, p87</ref><ref>''Vintage Synthesizers: Groundbreaking Instruments and Pioneering Designers of Electronic Music Synthesizers'' by Mark Vail, Backbeat Books, 2nd Revised edition, Jun. 2000, {{ISBN|0-87930-603-3}}, p. 61</ref><ref>[http://emssynthesisers.co.uk/emsstory.html The People], EMS: The Inside Story by Graham Hinton, 8 Aug 1998</ref>
== Designs ==
===
* [[EMS Synthi DKE]]▼
* [[EMS Synthi E]]
▲* [[EMS Synthi DKE]]
* [[EMS Synthi QUEG]]
* [[EMS Vocoder 2000]]
* [[EMS-Rehberg Analyse-filterbank B1]]<ref name="retroz">[https://www.soundonsound.com/music-business/all-about-ems-part-2 All About EMS: Part 2] by Gordon Reid, Sound On Sound, Dec 2000</ref>
* [[EMS-Rehberg Synthi-logik]]<ref name="retroz"/>
▲* [[EMS Universal Sequencer]]
=== Electronics magazine articles ===
* [[Wireless World Electronic sound synthesizer|Electronic Sound Synthesizer]], with D. W. Thomas, Wireless World, Aug to Oct 1973, [http://www.keith-snook.info/wireless-world-magazine/Wireless-World-1973/Electronic%20sound%20Synthesizer.pdf Keith Snook], [http://www.emusic-diy.org/Schematics/Synths Emusic DIY]
* Active filters, ETI, Jul to Sep 1977, [https://worldradiohistory.com/UK/Electronics-Today-UK/70s/ World Radio History]
* Op amps, ETI, Feb to May 1978, [https://worldradiohistory.com/UK/Electronics-Today-UK/70s/ World Radio History]
* Spectrum analyser, ETI, Jun 1978, [https://worldradiohistory.com/UK/Electronics-Today-UK/70s/ World Radio History]
* Designing oscillators, ETI, Jul 1978, [https://worldradiohistory.com/UK/Electronics-Today-UK/70s/ World Radio History]
* Polyphonic keyboard, ETI, Jul 1978, [https://web.archive.org/web/20150406120939/http://www.spontis.se/pdf/arak.pdf CAG]
* [[Powertran Transcendent 2000|Music Synthesiser]], ETI, Jul to Aug 1978, [https://web.archive.org/web/20160123231517/http://www.spontis.se/pdf/t2000.pdf CAG], [http://www.emusic-diy.org/Schematics/Synths Emusic DIY], [https://worldradiohistory.com/UK/Electronics-Today-UK/70s/ World Radio History]
* Ten 3080 circuits, ETI, Apr 1979
* Electronic music, Hobby Electronics, May to Jun 1979
* [[Powertran Transcendent DPX|Transcendent DPX]] (A String Thing), ETI, Aug to Oct 1979, [https://web.archive.org/web/20150405174129/http://www.spontis.se/pdf/eti_dpx.pdf CAG]
* Analogue delay lines, ETI, Nov 1979
* Analogue switches, ETI, Apr 1980
* [[ETI Black hole|The Black hole chorus machine]], ETI, May 1980, [https://web.archive.org/web/20150409040042/http://www.spontis.se/pdf/eti_bh.pdf CAG]
* Filter design, ETI, Jul 1980
* Bandpass and beyond, ETI, Dec 1980
* [[Powertran Transcendent polysynth|Polysynth]], ETI, Dec 1980 to Mar 1981, [https://web.archive.org/web/20150408214235/http://www.spontis.se/pdf/etipoly.pdf CAG], [https://worldradiohistory.com/UK/Electronics-Today-UK/80s/ World Radio History]
* Digital delay effects unit, E&MM, Feb to Mar 1982
* Facts on DAC's and ADC's, ETI, Mar 1982
* Electromusic techniques, ETI, Apr to Jun 1982
* Equaliser circuit design, ETI, Sep 1981
* Semi-professional mixer, Practical Electronics, Oct to Dec 1982, [https://web.archive.org/web/20150406121404/http://www.spontis.se/pdf/modmix.pdf CAG]
* [[ETI Chorus/flanger unit|Chorus/flanger unit]], ETI, Jan 1984, [https://web.archive.org/web/20150409161536/http://www.spontis.se/pdf/flanger.pdf CAG], [http://www.synthdiy.com/files/2005/flanger.pdf SynthDIY.com]
* Powertran MCS-1, with R Monkhouse and Paul Bird, E&MM, Oct 1984 to Mar 1985, [https://web.archive.org/web/20150410043541/http://www.spontis.se/pdf/emm_mcs1.pdf CAG], [http://www.muzines.co.uk/articles/powertran-mcs1/1473 Muzines]
* Powertran BBC MIDI interface, with Jim Grant, E&MM, Apr 1985
* Powertran BBC software (for Powertran MCS-1), with Jim Grant, E&MM, May 1985
== References ==
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== External links ==
* [https://www.youtube.com/watch?v=WJ8hIih_wN0 Trevor Pinch's DIY Modular Synth], YouTube
{{DEFAULTSORT:Orr, Tim}}
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