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  • determine RF voltage level to the respective 24A grids and therefore tone color but the aggregate adjustment of the two resistors determines the 24A s negative bias and cut off characteristic The mixer tube is biased beyond cut off even though its cathode is grounded Bias is obtained not only from the large negative peaks of RF voltage applied to the 24A grids but from a steady component developed in the cathode circuit of each HF oscillator The RF sine wave fed to each grid is very large on the order of 100V p p or more Only the peaks of positive voltage are large enough to produce pulses of plate current in in the 24A This plate current forms pulses corresponding to the frequency difference between the two HF sine waves The magnitude of the high frequency pulses but not the steady component of the bias is determined by the pot adjustments Therefore it is a complex system because turning either pot not only alters the magnitude of the synthesized audio frequency but its waveform The RCA theremin is very similar in this regard but lacks rheostat adjusters In the tuned circuit portion of the instrument the back of the instrument there is a small variable capacitor midway between the two pitch oscillators There is a red dot that shows where the tops of the plates should be This adjustment probably should not be changed This is the coupling control It may be just 10 picofarads or so to couple the plate circuits of the fixed and variable oscillators Effects are well described in the Lucy Rosen notes already published on the Levnet Coupling between the HF oscillators pulls and distorts the audio wave The pulling is fairly proportional to the lowness of audio frequency Treble notes sing more

    Original URL path: http://www.thereminworld.com/files/clara/clara_technotes.txt (2016-02-12)
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  • Theremin World - Reader Re-Creates Clara Rockmore's Theremin
    a hand drawn schematic he had created by closely examining Clara Rockmore s theremin Since then it s been the dream of many theremin enthusiasts that someone would be able to faithfully recreate her one of a kind instrument Well today we re one step closer Adrian Bontenbal has been busy for the past several years in The Netherlands working on his own version of Clara Rockmore s theremin He has shared with us a write up including photos schematics and parts values for the components he had to substitute with modern parts Unfortunately we don t yet have audio samples of how it sounds but if enough people show interest perhaps we can sway him to provide a few Here s to hoping it sounds as nice as it looks Read Mr Bontenbal s write up for more details on this ambitious project Update March 4 2012 Mr Bontenbal has provided an updated write up that includes some information omitted from his previous article Update June 24 2012 Another update with an additional timbre control circuit added allowing the player to choose between normal theremin brass or flute like tones Also includes a new circuit that lights an LED when a reference tone of 440Hz A is played Clara Rockmore DIY tube theremins Posted by Jason February 4 2012 Article Categories Art Books Composition Contests Events Exhibits Films Gear Gestural Instruments History Humor Inspiration Interviews Learn To Play Music Off Topic Performances Tech and DIY World Thereminization Popular Tags Albums Auctions Audio Bob Moog Carolina Eyck Clara Rockmore DIY Dorit Chrysler Etherwave Events History Japan Jason Learn to Play Leon Theremin Lydia Kavina Moog Music New York Spellbound Theremin ArtTheater Theremin History Theremin like Video Website News World Thereminization All tags A d v e r t i s

    Original URL path: http://www.thereminworld.com/Article/14289/reader-re-creates-clara-rockmores-theremin (2016-02-12)
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  • Theremin World - Schematics
    advanced projects If you re not sure where to start we suggest reading through our theremin construction forum to get an idea of which schematic might be best for you Note we ve moved schematics and technical information for RCA theremins and the Keppinger theremins to their own pages Sort By Title Date Clara Rockmore s Theremin Schematic Added by Jason 5 12 2008 Hand drawn by Bob Moog these schematics will give you insight into Prof Theremin s original design concepts schematic page 1 schematic page 2 Also available are the technical notes Bob Moog wrote while working on her theremin Adrian Bontenbal also provided some additional tech notes on this circuit with details that are hard to make out from Bob s schematic as well as some bonus circuits Clara Rockmore tube theremin Schematics Recent Forum Posts by coalport on What do we need to acompany the Theremin an hour ago by tomdog54 on Best Hardware Synth to play with Theremin 4 hours ago by coalport on Haken Continuum as a Theremin Effect 1 day ago by dewster on LinnStrument interesting MIDI controller 3d touch 2 days ago by oldtemecula on What is the best playable 3 days ago Recent Comments by Ginette on article Thomas Grillo s Theremin Lessons Available on Amazon Instant Video 4 days ago Are these dvd s available in Canada I cant seem to get one through Amazon I will try again tomorrow Thank you These dvd s are great from what w by johnthom on article New Dutch surprise 18 days ago Video appears to be private by Thierry on article Registration Open for NODE Winter Theremin Academy 2016 66 days ago One highlight of this academy will be a concert where Lydia and I will play original works for theremin which

    Original URL path: http://www.thereminworld.com/schematics?tag=Clara%20Rockmore&asc=True (2016-02-12)
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  • c b Q2 e Q3 e Ant1 Ant2 b C1 b C2 R1 c c R2 C5 C3 L1 R3 C6 C4 L2 0V Q1 2N1097 Q2 3 2N1264 R1 180K R2 3 51K C1 2 200pF C3 4 200pF Trimmer C5 6 0 01uF L1 2 vari loopstick S1 SPST Connections to the collectors of Q2 3 are made via 5 way binding posts Antennas are Lafayette F343 whips

    Original URL path: http://www.thereminworld.com/files/AsciiTheremin.txt (2016-02-12)
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  • Theremin World - Schematics
    of which schematic might be best for you Note we ve moved schematics and technical information for RCA theremins and the Keppinger theremins to their own pages Sort By Title Date ASCII Schematic Added by Jason 2 22 2005 This simple schematic came from the book 103 Simple Transitor Projects listed in the theremin bibliography transistor schematic Recent Forum Posts by coalport on What do we need to acompany the Theremin an hour ago by tomdog54 on Best Hardware Synth to play with Theremin 4 hours ago by coalport on Haken Continuum as a Theremin Effect 1 day ago by dewster on LinnStrument interesting MIDI controller 3d touch 2 days ago by oldtemecula on What is the best playable 3 days ago Recent Comments by Ginette on article Thomas Grillo s Theremin Lessons Available on Amazon Instant Video 4 days ago Are these dvd s available in Canada I cant seem to get one through Amazon I will try again tomorrow Thank you These dvd s are great from what w by johnthom on article New Dutch surprise 18 days ago Video appears to be private by Thierry on article Registration Open for NODE Winter Theremin Academy 2016 66 days

    Original URL path: http://www.thereminworld.com/schematics?tag=schematic&asc=True (2016-02-12)
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  • Theremin World - Schematics
    types of theremin schematics You ll find tube theremins transistor theremins optical theremins beginner and advanced projects If you re not sure where to start we suggest reading through our theremin construction forum to get an idea of which schematic might be best for you Note we ve moved schematics and technical information for RCA theremins and the Keppinger theremins to their own pages Sort By Title Date The Theremin by Robert Moog Added by Jason 2 21 2005 This tube theremin article originally appeared in Radio and Television News in 1954 You might have trouble finding all the parts to build this theremin today but the article is also an excellent source of technical information tube theremins Bob Moog Recent Forum Posts by coalport on What do we need to acompany the Theremin an hour ago by tomdog54 on Best Hardware Synth to play with Theremin 4 hours ago by coalport on Haken Continuum as a Theremin Effect 1 day ago by dewster on LinnStrument interesting MIDI controller 3d touch 2 days ago by oldtemecula on What is the best playable 3 days ago Recent Comments by Ginette on article Thomas Grillo s Theremin Lessons Available on Amazon Instant Video 4 days ago Are these dvd s available in Canada I cant seem to get one through Amazon I will try again tomorrow Thank you These dvd s are great from what w by johnthom on article New Dutch surprise 18 days ago Video appears to be private by Thierry on article Registration Open for NODE Winter Theremin Academy 2016 66 days ago One highlight of this academy will be a concert where Lydia and I will play original works for theremin which are actually composed by students of th by johnthom on article Holiday Shopping Deals For Thereminists

    Original URL path: http://www.thereminworld.com/schematics?tag=Bob%20Moog&asc=True (2016-02-12)
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  • Theremin World - Schematics
    theremins optical theremins beginner and advanced projects If you re not sure where to start we suggest reading through our theremin construction forum to get an idea of which schematic might be best for you Note we ve moved schematics and technical information for RCA theremins and the Keppinger theremins to their own pages Sort By Title Date Big Briar Etherwave Mute Switch Added by Jason 2 21 2005 Ever wanted to get rid of the pop when you turn on your Etherwave Arthur Harrison has developed a mute switch for the Etherwave that will do just that It also adds a mute status light which doubles as a power on light Here s the schematic Don t forget to browse the rest of Art s great site Etherwave mods Recent Forum Posts by coalport on What do we need to acompany the Theremin an hour ago by tomdog54 on Best Hardware Synth to play with Theremin 4 hours ago by coalport on Haken Continuum as a Theremin Effect 1 day ago by dewster on LinnStrument interesting MIDI controller 3d touch 2 days ago by oldtemecula on What is the best playable 3 days ago Recent Comments by Ginette on article Thomas Grillo s Theremin Lessons Available on Amazon Instant Video 4 days ago Are these dvd s available in Canada I cant seem to get one through Amazon I will try again tomorrow Thank you These dvd s are great from what w by johnthom on article New Dutch surprise 18 days ago Video appears to be private by Thierry on article Registration Open for NODE Winter Theremin Academy 2016 66 days ago One highlight of this academy will be a concert where Lydia and I will play original works for theremin which are actually composed by students of

    Original URL path: http://www.thereminworld.com/schematics?tag=Etherwave&asc=True (2016-02-12)
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  • Theremin World - Construction of a Semi-Replica RCA Theremin
    room for parts and kept the look of the original Theremin Photo 2 Coils Pitch and Volume Coils A five inch coil form was not to be found so I decided to use a 5 3 16 in mailing tube I cut the tube to the original length and sealed it with varnish I calculated the impedance of the original coils and then back calculated the length of the windings based on the larger diameter The critical dimensions in a solenoid type coil are the diameter length and number of turns The wire size was calculated based on close winding the necessary turns per inch which turned out to be 36 The original coils were wound with double cotton covered wire which is difficult to get now so I used enamel coated magnet wire The necessary hardware for connecting and mounting the coils was fabricated and the coils wound by hand Photo 3 Pitch Oscillator Coils The dimensions of the fixed and variable pitch oscillators were available so the only challenge was the construction Varnished 1 3 4 in cardboard tubes were used as forms Photo 4 Volume Oscillator Coil No information was available on the volume oscillator coil or associated capacitors except the diameter and that the capacitors looked physically the same A cardboard coil form was used as in the pitch oscillators I decided that RCA would probably use the same coil for both the pitch and volume oscillators because it would be cheaper I assumed that they would vary the parallel capacitance to get an oscillation frequency different than the pitch oscillators I made all the coils the same and expected to have to find the correct parallel capacitance experimentally Photo 5 Concentrating coil The concentrating coil is a relatively high inductance coil located inside the large pitch coil Information was that the inductance needed was 20 mH and I had 15 and 5 mH chokes so I connected them in series Audio Transformers The two audio transformer impedances were unknown so I used transformers made by Chicago Standard Transformer Corp Model A 53 with a 1 3 ratio still commercially available My experience with these old tubes and circuits is that they aren t too fussy about impedances Multi Section Resistor RCA used a multi section power style resistor for several resistances required by the circuit There is no apparent reason for this so I mounted a large terminal strip in the same location that RCA used and attached discrete resistors along the strip to approximate the original Photo 6 This also provided a convenient place to mount some other components Antennae The antennae had to look like the original RCA Theremin The information I had was that they were 7 16 in diameter the length of the pitch antenna was 17 in and some photographs I scaled the volume antenna from the photographs and made a jig to bend rod around to get the right size and shape I used brass rod to form the

    Original URL path: http://www.thereminworld.com/article/13278/construction-of-a-semi-replica-rca-theremin (2016-02-12)
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