100SILEX, de 0 ŕ 100 s: voltage
1517 THE MUTANT MACHINE Dynamic Analog Percussion Engine
MICROCONTROLLER FREE ANALOG PERCUSSION SYNTHESIS unique Inverter Core oscillators form the MEMBRANE. Each analog oscillator has three waveforms to select from capable of synthesizing everything from heavy-hitting bassdrums to classic 909-style snares and other complex timbres modular design gives the Machine many auxiliary purposes, great for modular sound design of many varieties, and not just percussion the SNAPPY section is comprised of a voltage controlled noise oscillator, for modelling the noisy part of drum timbres both MEMBRANE and SNAPPY elements have an external input for replacing the built-in sound sources, opening up many avenues of possibility 13 control voltage and audio inputs, for a fully modular drum experience 7 audio and CV/gate outputs for maximum integration with other modules dedicated outputs for each WAVE and NOISE oscillator mean you can use the Machine as a complex VCO in your system, when not synthesizing percussion WAVEFORM SCANNING FEATURE GENERATES COMPLEX TIMBRES the MEMBRANE’s waveforms can be scanned through automatically by the wavescanner’s voltage controlled clock generator, or an external clock or VCO can be used SCAN FREQ CV forms a unique form of timbre control, making the Machine act like a complex oscillator at its WAVES output the ENABLE input allows you to gate the wavescanner on and off with a CV or gate signal ARCHITECTURE OF THE MACHINE The Mutant Machine is a dynamic analog instrument capable of generating a wide palette of sounds, ranging from various forms of analog percussion to complex drones and oscillations. To achieve this, the Machine features two synthesis sections which are summed together at the final output: MEMBRANE and SNAPPY. Like the other Mutant Drums, the MEMBRANE and SNAPPY circuits began their mutation as classic analog percussion techniques and have been reimagined for 21st century modular synthesis. The MEMBRANE forms the main body of the sound by way of two analog VCOs, and the SNAPPY section further adds to the timbre by contributing noisy elements to the mix. A noisy CLICK which occurs at the beginning of the SNAPPY sound can have its volume adjusted independent of the main decaying SNAPPY texture. The waveforms which make up the MEMBRANE can be selected manually by button press, or the WAVESCANNER can be used to automatically scan through the available analog waveforms. By modulating the frequency through which waves are scanned, unique, complex sounds are created. Experimentation is encouraged by the many modulation inputs and outputs available to you. The Machine features 8 CV and gate inputs for modulation as well as two external audio inputs, for bringing other modules into the Machine’s core. There are many audio outputs for maximum versatility, allowing you to use the Machine to create drones and alien timbres for use elsewhere in the modular analog system.
http://www.hexinverter.net/mutant-machine

1391 LED Facts & How To Safely Use LEDS
LED facts, current requirements, voltage and resistor selection. How to properly use LEDs in your own projects. With color and power chart and full details. diy led lamp, diy led light bulb, diy leds, homemade led light bulb, make a led light bulb, diy rv led lights, diy camper led lights, diy auto led light
http://www.thediyworld.com/How-To-Properly-Use-LEDs.php

1144 Synapse Magazine - Electronic Music and Synthesizers
Analog Synthesizers and Modular Synthesizers for electronic music and surround sound design synapse, analogue synthesizers, modular synthesizers, synthesizers, analog modular synthesizers, synthesizer, music synthesizer, synth, steiner filter, steiner VCF, synthacon, synapse, analog, electronic music, oscillator, voltage control, voltage controlled oscillator, wasp filter, envelope generator, sequencer, filter bank, ring modulator, cynthia webster
http://www.cyndustries.com/synapse/intro.cfm

1097 synth books
Here's a list of books relating to synthesizers and electronic music that we think are worth reading. Click on the image to go to Amazon.com and view more information and purchase them. Feel free to suggest a book. We do not sell books. Synthesizers.com Modular Analog Music Synthesizers Synthesizers.com, synthesizer, synth, synthesizers, modular, analog, arrick, analogue, keyboard, music, sound, effects, patch, vco, vcf, vca, ladder, oscillator, voltage control, low pass, filter, amplifier, envelope generator, CD, MP3, reverb, pan, fade, mixer, noise, sample, hold, sequencer, roland, moog, SEM, oberheim, yamaha, arp, 2500, 2600, vintage, vocoder, filter bank, ring modulator, sampler, clipper, rectifier, fuzz, multiple, processor, switch, interface, state variable, noise
http://www.synthesizers.com/books.html

984 Trogotronic Vintage High Voltage Multi-Tube Hot Rods
synth
http://www.trogotronic.com/webhotcont.html

884 jh_polykorg_clone
I have started to build a (slightly) updated version of the Korg PS-3200 synthesizer. The PS-3200 was the last of three fully polyphonic, semi-modular analogue synthesizers offered by Korg in the late 70's. (See Ben Ward's excellent Korg PS site for detailed information, including user manuals.) The concept of the PS-Synthesizers was different from other manufacturer's early polyphonic instruments. Instead of using a small number of voices and a clever keyboard assigning circuit, the "PolyKorgs" had a complete synthesizer circuit, hard wired to each key. That makes a total of 48 VCFs, 48 VCAs and 48 voltage controlled ADSRs even for the smallest of the range, the PS-3100. The largest of the range, PS-3300, even had 144 of these circuits. The sheer number of synthesizer circuits called for an extremly economic circuit design, and it's a joy to look at Korg's design ideas which led to building blocks that almost did the same as in the better known "classic" synthesizers. And after many years of engineering and reverse-engineering electronic music circuits, I have learned to look at odd solutions not as "substandard", but as a source of creativity an individual character. Here's a list of some highlights: Function Implementation Side effects Single-Transistor Waveform Converter creates triangle, saw, pulse and PWM from saw input, using one (!) transistor, one diode and two resistors per voice, plus two global control voltages Pulse height also changes with pulse width 5-Transistor-VCF (Korg-35) A Voltage controlled 2-pole (Sallen&Key) LPF built from 5 transistors rather high CV feedthru Single-Diode VC Resonance The dynamic resistance of a simple diode is used to alter the feedback gain of the VCF limited range of Q "Expand" function instead of VCF Envelope modulation depth Instead of scaling down the ADSR with a VCA, the a variable portion of the Envelope is just clipped with a single diode. It's so remarkably close to ordinary VCA function that apparently nobody takes notice. At least I have not read about it anywhere. At slow Atack times, the Envelope appears delayed at the VCF (no effect until th eclipping point is reached). Usefull for Brass sounds, and not easy to emulate with conventional synthesizers. Minimum parts count Voltage Controlled ADSR Three transistors, 1/2 of a LM324 and one CD4007 per voice. Plus some more involved control circuit, shared by several voices Transistors must be selected in 13-tuples, not just in pairs. ADSR detail (1): One-opamp control logic 1/4 LM324 is used as Flipflop, which is dynamically set by Gate-ON, dynamically reset by Gate-OFF, statically reset when the attack peak voltage is reached, and whose set/reset sensitivity is altered by a CV Very odd "Hold" function, depending on the "Attack"-value. But very useful in practise. ADSR detail (2): Single-Transistor, exponential slope VC-Decay Using a single transistor per voice for VC Attack and Release is remarkable already, even though the A and R slopes are linerar. But the Decay slope is exponential, and this is achieved with a single transistor and two resistors per voice! The Decay time range is rather limited. No ultra fast Decay, and no ultra slow Decay either. Single-Transistor VCA That's the "Korg standard" VCA, well known from other instruments like the MS-10.
http://jhaible.de/polykorg/jh_polykorg_clone.html

812 ED102 - Octave-Volts-Hertz
The ED102 borrows heavily from the Korg MS-02™ although it was developed independently of Korg Inc. Korg and MS-02 are the trademarks of Korg Inc. Among presently available music synthesizers, there are two different types of control system used for controlling devices such as the VCO (voltage controlled oscillator) and VCF (voltage controlled filter). These two systems been: Hertz/Volt (Hz/V) and Octave/Volt (Oct/V). The graph to the left shows the relationship between the VCO oscillator frequency (pitch) and the control voltage (keyboard output voltage). The straight line on the graph is from a synthesizer in which there is a one octave change for every one volt change in the control voltage (Oct/V). In contrast, the curved line on the graph is the control voltage from a synthesizer in which the VCO frequency is proportional to voltage (Hz/V system). To allow these systems to work together you will need a module like this ED102. The built-in, fully adjustable log amp and anti-log amp ensure complete system flexibility and compatibility between any presently voltage controlled synthesiser. The Hz/V system In the Hz/V system, the VCO oscillator frequency is proportional to the control voltage so that, for example, if the frequency of a VCO increases by 100Hz for every volt applied, then applying 1V, 2V and 3V to this VCO would generate 100Hz, 200Hz and 300Hz respectively. The Oct/V system In the Oct/V system the VCO oscillator frequency changes one octave for every one volt change in the control voltage so that, for example, 1V, 2V and 3V to a VCO would generate 200Hz, 400Hz and 800Hz respectively. Features and Functions Log Amp: This changes a Hz/V type keyboard CV (control voltage) output into an OCT/V type of CV. Use the Log Amp to change the control signal from, say, a Korg or Yamaha synthesiser into a signal you can use with another type of synthesizer. Antilog Amp: This changes an OCT/V type of keyboard CV output into a Hz/V type of CV. Use this Antilog Amp when you want to control, say, a Korg synthesiser by means of a unit that uses the OCT/V system.
http://www.elby-designs.com/panther/ed102-octave-volts-hertz/ed102.htm

679 Trevor Marshall's ETI3600, ETI4600 International Music Synthesisers and Maplin 3800 and Maplin 5600s Stereo Synthesisers
Many years ago the Australian magazine "Electronics Today International" published my designs for two partly digital, mostly analog, Electronic Music Synthesisers. the ETI 3600 and ETI 4600. Both were made available as kits of components Barry Wilkinson at ETI was responsible for the final packaging and kitting coordination. Maplin Electronics Ltd.(in the UK) subsequently picked up the designs, which they marketed as as the Maplin models 3800 and 5600s Electronic Music Synthesisers At the time I held two Australian provisional patents for the technologies I used in the Synthesiser designs. One related to the method for generating sawtooth waveforms, the other was for the method of using commutated resistors in voltage controlled filters. I never made any money out of the designs, or the patents, which have long ago been allowed to lapse. But it was fun! The original constructional articles for the ETI 3600/4600 can be found in these PDFs: October 1973, December 1973, January 1974, Feb 1974, March 1974, April 1974, July 1974, March 1975, April 1975, May 1975, August 1975 Although the earliest (4004) microprocessors were available at that time, it was not until the late-70's that I first started programming fully digital (Signetics 2650 based) Microcomputer systems. Consequently my early digital designs were hardware, and not firmware, based. Of course, these days, everything in my hardware and firmware is based on software designs - even the interconnections are controlled by the software in the EPLDs and PALs, instead of by wires. So many things have changed over the years.... Here is a mug shot of the Maplin 3800:
http://www.trevormarshall.com/eti.htm

411 1981� 2006 : 25 ann�es d�activit� et depr�sence pour l�A.U.R.O.R.E. et le C.E.P.H.E.S.
danger relais depris, expertise, expert, consultant, radiesthésie, géobiologie, indépendant, lobby, lobbies, corporation, électricité, électronique, télécommunication, électromagnétique, conférence, formation, rapport, electrique, électriques, basse, moyenne, haute, tension, haute tension, émetteur, Hertzien, relais, téléphone, téléphonie, sans fil, radar, radio, TV, faisceau, ionisant, transformateur, générateur, onde, micro-onde, infrason, ultrason, BT, MT, HT, THT, transport, distribution, pollution, perturbation, interférence, nuisance, EDF, RTE, détection, ligne, pylone, cable, aérien, souterrain, immergé, sous-marin, patrimoine, huile, isolation, gaz, intensité, ampère, volt, voltage, ampérage, section, conducteur, conductrice, électrocution, électrisation, supraconducteur, supraconductivité, supraconduction, tranchée, galerie, fleuve, rivière, mer, lac, baie, surintensité, surtension, claquage, disjoncteur, fusible, fiable, fiabilité, europe, danger
http://depris.cephes.free.fr/presscom/2006/007/index.html

410 Pollutionsélectromagnétiques : il y a mesures et mesures…à propos de métrologie et d’appareils dits « demesure »…
danger relais depris, expertise, expert, consultant, radiesthésie, géobiologie, indépendant, lobby, lobbies, corporation, électricité, électronique, télécommunication, électromagnétique, conférence, formation, rapport, electrique, électriques, basse, moyenne, haute, tension, haute tension, émetteur, Hertzien, relais, téléphone, téléphonie, sans fil, radar, radio, TV, faisceau, ionisant, transformateur, générateur, onde, micro-onde, infrason, ultrason, BT, MT, HT, THT, transport, distribution, pollution, perturbation, interférence, nuisance, EDF, RTE, détection, ligne, pylone, cable, aérien, souterrain, immergé, sous-marin, patrimoine, huile, isolation, gaz, intensité, ampère, volt, voltage, ampérage, section, conducteur, conductrice, électrocution, électrisation, supraconducteur, supraconductivité, supraconduction, tranchée, galerie, fleuve, rivière, mer, lac, baie, surintensité, surtension, claquage, disjoncteur, fusible, fiable, fiabilité, europe, danger
http://depris.cephes.free.fr/presscom/2007/010/index.html

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