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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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Posted: Fri Feb 01, 2013 6:25 am Post subject:
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VCO with temperature compensation subcircuit presented by Juan Bermudez in his book Nueva Genration de instrumentos musicales Electronicos
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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Posted: Fri Feb 01, 2013 11:46 am Post subject:
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4720A Voltage Controlled Oscillator by Paia , get the whole document on construction of this module on Paia Talk : http://www.paia.com/talk/viewtopic.php?f=6&t=191 and this link for troubleshooting guide by Scott Lee : http://www.paia.com/talk/viewtopic.php?f=29&t=209
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2.64 MB |
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28.15 KB |
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Fri Feb 01, 2013 12:33 pm Post subject:
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XR2207 VCO by Professor James J. Clark , the page dedicated to this module with full description ,scope shots ,and XR2207 Datasheet : http://www.cim.mcgill.ca/~clark/diy/jjclark_2207_vco.html , the specifications given there :
Inputs:
PWM (pulse width modulation control)
1V/oct (pitch control)
LinFM (adjustable AC-coupled linear frequency modulation)
ExpFM (adjustable exponential frequency modulation)
Outputs:
Pulse, Triangle, Sawtooth
Panel Controls:
PWM - pulse width modulation amount
FINE - fine pitch offset, roughly 1.2 octave range
COARSE - coarse pitch offset, roughly 5 octave range
LIN FM - linear FM amount
Exp FM - exponential FM amount
PW - pulse width
Size - 3U x 12HP (128.5mm x 60.6mm)
Power Supply Current (max) 35.8mA at +12V, 30.7mA at -12V
Frequency Range: 15 Hz to 7 KHz
Linear Frequency Range (linearity error less than 1%, average 0.13%): 30Hz to 4.2KHz (7+ octaves)
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1399 Time(s) |
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Fri Feb 01, 2013 1:13 pm Post subject:
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VCO Function Generator Type B - Sine and Triangle from The Synthasystem design by Nyle Steiner ,visit Analogue Realities project page dedicated to the Synthasystem for details on this module ,BoM ,and availability on pcb's .This is the page dedicated to this VCO http://user.xmission.com/~dingebre/VCO_B_Sine_Triangle.html from there ,the description by David M. Ingebretsen who runs the Synthasystem clone project :
This module produces an oscillating signal whose frequency is based on a voltage input. Typically, this is an audible tone, but this module can oscillate from well below hearing to well above. The control voltage input is typically tuned to a 1 volt/octave scale. Two waveforms are available, Sine and Triangle. These two outputs are available at the same time. This module has a very wide useable frequency range from well below audible as a Low Frequency Oscillator to above hearing without re-tuning. Nyle really outdid himself on this module. Very unique and I will say I think it has the best sine wave I've heard.
visit the Synthasystem subforum for further information : http://electro-music.com/forum/forum-189.html
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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Posted: Fri Feb 01, 2013 3:34 pm Post subject:
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Saw Animator by Yves Usson ,web page with details ,pcb layouts ,bill of materials and demo : http://yusynth.net/Modular/index_en.html
From the description given by Yves : The Saw Animator module is a very interesting module when you whish to get that FAT sound, usually obtained with two or more sawtooth VCOs, but you are short of VCOs. You can get this typical sound with only one sawtooth VCO, thanks to Bernie Hutchins (JAES, 1981). The Digisound 80 has this wonderful module and Scott Bernardi designed a version of its own. The present module is a somehow simplified but yet efficient version. To get the best of this module, it must be used in conjunction with a mixer. I chose not to integrate a mixer within the module in order to benefit from the dry outputs which are very useful when used with a LFO instead of a VCO. When used with a sawtooth LFO and inputing fixed CVs in the MOD inputs, one can achieve some interesting phase shifted modulators such as quadrature modulation. Well the possibilities are numerous and it's up to your imagination...
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bubzy
Joined: Oct 27, 2010 Posts: 594 Location: United Kingdom
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Fri Feb 01, 2013 3:43 pm Post subject:
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Ken Stone's Wave Multiplier ,page with details ,BoM , and pcb's http://www.cgs.synth.net/modules/cgs29_wave_multiplier.html from the notes there :
The idea for this project came from the fabled middle section of the Serge wave multipliers. At the time I designed this, I had never seen or heard one of these units, nor had I seen its schematic diagrams, but armed with descriptions and suppositions by various people who had seen them, and a couple of photos of CRO traces from the output of the module, I decided to design myself one.
The result as displayed on the CRO is very close to those of the Serge, with the exception of the final fold, where, in my design, the wave maintains more of its original shape. It can produce the most amazing, harmonically rich, filter-like sweeps.
In addition to this multiplier, there are two more simple multipliers, one created by adding lag to the feedback path of an op-amp, the other being the "Nonselective Frequency Tripler" by R. Lockhart. Its functionality is not unlike Moog's single transistor sawtooth to triangle wave converter. It's intended purpose is to convert a signal into another of three times the frequency. To do this it expects a +/-1.2 volt triangle or sine wave, and outputs a +/-0.4 volt complex waveform. Unfortunately, due to the uneven spacing of the frequency multiplied waveform, it does not sound like it is a fifth above the incoming signal. This of course in of no particular concern in this application, as the purpose of this module is to create a complex harmonic structure from a simple input, not to triple the frequency. See the Simple Wave Folder for further details on this circuit.
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Fri Feb 01, 2013 3:56 pm Post subject:
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Digisound 80-20 Waveform Multiplier ,more info and full documentation here : http://www.digisound80.co.uk/digisound/modules/80-20/80-20.htm
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2.5 MB |
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1.7 MB |
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1.8 MB |
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Sat Feb 02, 2013 3:57 am Post subject:
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Juergen Haible's Living VCO ,the page dedicated to this module is here : http://www.jhaible.de/living_vcos/jh_living_vcos.html ,thread on the forum : http://electro-music.com/forum/topic-30749.html
This is how Juergen Haible describes this VCO design :
My goal was to build a set of VCOs that have the untamed bass range power of early EMS and Moog VCOs, but which are tracking a keyboard voltage over 5 or more octaves nevertheless. I found that "untamed" Beating in the bass range and controlled beating in higher octaves is not possible with standard exponential 1V/Oct oscillators. A good part of that special sound of early Moog and EMS oscillators is not because of any "randomness", "unstability", "instability" or "noisyness", as so often is said. A good deal of their behavior is because of that, but it is not the whole story. There are also some very deterministic factors in these old circuits which have been unpleasant side effects for the designers back then, but which are worth a closer analysis when we're designing a musical VCO today. This is implemented in form of three "linear detune" potentiometers on the JH-5A VCOs.
Features
Discrete (no opamp), noisy servo in expo converters (VCS3 feature)
Emulation the low frequency behaviour of linear (Hz/V) VCOs and of leakage (EMS VCOs)
Capable of very pleasant beat rates between the VCOs over the entire keyboard range
Allows rich and powerful animated bass sound, and smooth "phasing" slow-beating sound in higher octaves
Discrete (no opamp) pulse width modulators (capable of smooth audio rate PWM)
Limited PW range allows PWM overmodualtion (CS-80 feature)
Low level (Moog) or high level (MOTM) outputs
VCO driver with two CV inputs, LFO oscillator with limited speed range and voltage controlled amount
Accepts potentiometer (passive modulation wheel etc.) or CV for vibrato control
Exponential (RC-Shaped) Portamento
Either one shared, or 3 individual potentiometers for Initial Pulse Width
visit his page for detailed analysis : http://www.jhaible.de/living_vcos/jh_living_vcos.html
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Sat Feb 02, 2013 4:06 am Post subject:
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Sawtooth VCO by Ian Fritz ,visit his page for in depth overview on this circuit http://home.comcast.net/~ijfritz/sy_cir2.htm ,from the description given there :
The figure above shows my current implementation of the popular integrator-with-reset sawtooth VCO. Very briefly, the circuit operates as follows. Capacitor C2 and op amp OA3 form an active integrator which is driven by current from an exponential current source built around op amp OA2 and the differential transistor pair Q1-Q2. When the integrator output reaches the 4-V threshold set by OA4, the comparitor U1 puts out a short voltage pulse which turns on the FET switch Q3, thereby discharging C2. The charging cycle then begins again. The input control signals are summed and scaled by OA1, with temperature compensation provided by R11. Finally, OA5 scales the output to a 10-V peak value. The design is a modification of the original circuit of Terry Michaels (Electronotes, v. 62).
The main goals of the present design were to reduce the temperature drift and to improve speed and tuning accuracy by employing modern op amps. For improved stability and temperature drift, on-board +/- 6.9 V regulated supplies were added (circuitry around the LM329 chips in the upper right corner of the figure). These are used to supply the critical voltages in the circuitry for: 1) the coarse frequency control (R3), 2) the reference current in the exponential converter (OA2) and 3) the ramp reset point (OA4). For improved op-amp performance in critical parts of the circuit -- OA1, OA2 and OA3 -- I selected the Burr Brown OPA132. This chip was chosen for its combination of low input current (5 pA), fast slew rate (20 V/usec), high stability and moderate price (under $4).
this design is further discussed on this thread : http://www.electro-music.com/forum/topic-28633.html
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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Posted: Sat Feb 02, 2013 8:14 am Post subject:
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Harmony Generator by Paul Williams published in E&MM October 1981
From the article :
- Fixed accurate harmonies ,unison ,3rd and 5th
- Pitch shift up or down 3 octaves
- Ideal accessory for the synthesist
- Powered by single PP3 battery
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1.86 MB |
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1.8 MB |
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607 Time(s) |
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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vladosh
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
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