Page 1: ...CS 8 Series Owners Manual Omega Phi...
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Page 3: ...ctronic musical instruments is constantly striving for improvements and developments of their products Therefore we reserve the right to change technical specifications which improve our products at a...
Page 4: ...mely significant properties For typical oscillators namely harmonic relationships will vary with changing modulation depths Index I e although the ratio of the carrier frequency modulated oscillator a...
Page 5: ...thermore the frequency range can be selected very quickly and reliable by a 4 pole rotary switch and a toggle switch over seven octaves and from there another 1 octave as well as 100 cents The finally...
Page 6: ...7 CONTROLS 9 7 1 Front panel 9 7 2 Backside 12 7 3 Initial operation 14 8 1 Layout and functions 14 8 2 The e function generator 16 8 3 The VCO core and its wave shapes 17 8 4 The linear frequency mo...
Page 7: ...with Schippmann electronic musical instruments Any Schippmann electronic musical instruments product deemed eligible for repair or replacement under the terms of this warranty will be repaired or repl...
Page 8: ...ed in FCC Regulations part 15 The device complies with EN 55103 1 and EN 55103 2 standards Because of the entirely analogue construction this device does not generate radio frequencies and will not in...
Page 9: ...RE TO MAKE SURE THAT CHILDREN FOLLOW ALL SAFETY INSTRUCTIONS SAME THING GOES FOR PETS AVOID MECHANICAL STRESS OR IMPACT DO NOT DROP THE PRODUCT EVEN IF THERE IS A CONTROL LABELLED DROP DO NOT USE THE...
Page 10: ...IDC connectors 4 x M3 screws 4 x polypropylene washers This owners manual If the content of the box turns out to be incomplete please get in touch with your dealer or Schippmann electronic musical in...
Page 11: ...CS 8 Series Omega Phi Rev1 04 Oct 2015 9 7 CONTROLS 7 1 Front panel Fig 1 shows the front panel with consecutively numbered controls and jacks Fig 1 Omega Phi front panel...
Page 12: ...of the VCO 9 Depth control attenuates the modulation signal at jack 10 between 0 and 1 10 Modulation input envelope symbol jack channels the applied signal via Depth control via Depth control 9 to the...
Page 13: ...fier 2 pos toggle switch determines the method of rectifying at the FM linear input full wave Full or half wave for only positive input voltages Half pos this is a special function due to the applied...
Page 14: ...rchitecture 40 Triangle Symbol jack output Triangle output of the phase section Phi 10 Vpp 41 Up jack input Synchronization input sets the triangles direction to rise up with a positive going trigger...
Page 15: ...Sinus Omega Output 2 THD g1 12 gauge Trimmer P8 THD calibration of Sinus Omega Output 3 IC 1 pinned VCO module 4 THD g2 12 gauge Trimmer P10 THD calibration of Sinus Phi Output 5 THD off2 12 gauge Tri...
Page 16: ...t calibration of the frequency modulation VCA 14 16 Pin power supply box header 7 3 Initial operation The power connector s 8 pin out in top view refer to fig 2 is assigned as follows Bottom to top le...
Page 17: ...lower LFO 55 880 110 1760 220 3520 440 7040 Tune Fine 1 V Oct 0 5 V Oct U LIN exp U sum U LIN Zero cross Detector green red VCO core Wave shaping Off On Zero Value PW Zero Crs Up Down Reverse Set Sync...
Page 18: ...nerally for resulting voltage output UC one obtain the mathematical expression where is an exponential scaling factor and Usum the total input voltage at the exponential input following called e input...
Page 19: ...e step at the equally temperate scale 1 V Oct jack An external voltage at that jack increments or decrements the current oscillator frequency with a sensitivity of one octave x2 per Volt resp 2 per Vo...
Page 20: ...side Saw shape mid Saw shape left side Saw shape left Triangle reference Sinus Fig 4 The waveforms of the VCO core Omega outputs The triangle is the reference for all other waveforms PW PWM Depth The...
Page 21: ...ar frequency modulation FM In Abb 3a above the ULin input of the e generator which finally is fed with the FM voltages goes to the output of a Rectifier There may exist different solutions for the rea...
Page 22: ...or carrier and modulator the results for index 2 I e die modulation amplitude is twice as high as the bias For the wave of the modulator the rectifiers output would reach the values 3 normalized graph...
Page 23: ...ng its minimum maximum whereas in zero off mode it continues its direction up to its very end For switching on or off the thru zero mode there is the Zero switch Thru zero mode in position on and off...
Page 24: ...ldn t exceed 10 V if linear working of the VCA is wished best is 5 V Index Depth controller The Depth controller attenuates the modulation signal at jack 2 Envelope symbol between 0 and 1 This signal...
Page 25: ...the triggering threshold 3 V After triggering by exceeding the upper threshold the signal has to fall below the lower threshold 1 V before another trigger can occur hysteresis To make it easier in the...
Page 26: ...le immediately to that value adjusted with the Value controller It can be set to all positive or negative values 5 V the triangle can attain The current direction will be not influenced however The tr...
Page 27: ...milar to FM However there are existing clear differences First of all the similarities and even identities Considering solely sine wave functions and a system of two oscillators carrier and modulator...
Page 28: ...radian measure with the Phi controller The phasing of the waves by itself has no effect of their sound and spectrum Only changes of the phase causes real frequency shifts at the Phase shifters output...
Page 29: ...he phase jumps Because it is the phase change which could be heard with low frequency saw tooth waves e g which amplitude is adjusted to shift the phase by exactly 360 or 720 constant detunes can be g...
Page 30: ...to the left high positive modulation voltages at the Depth controller can be cut A capacitive decoupling is not necessary because offsets only leading to a constant phasing what could be corrected wit...
Page 31: ...second the phase is running forward stopping or reverting the result is no longer sinusoidal Taking for M t sin mt F a sinus function as chosen in all the examples above with m as the modulation angu...
Page 32: ...requency PM t for the PM the term in the round bracket behind the sinus of PM t namely the phase as a function of time is to derivate with respect to time inversion of integration And with M t sin mt...
Page 33: ...CAL SPECIFICATIONS AND RATINGS 10 1 Specifications generally Input and output sockets mono jack sockets 3 5 mm 1 8 Input sockets have grounded switch 0 V Power 12 V 12 V polarity protection Power cons...
