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CMOS Synthesizers - Beavis Audio Research

CMOS Synthesizers - Beavis Audio Research
Chip Basics For our experiments, we'll use a couple basic chips: 40106 Hex Inverting Schmitt Trigger: This chip contains 6 individual Schmitt triggers. A Schmitt trigger is a comparator circuit that incorporates positive feedback. What this means is that when a high signal (positive voltage defined as '1') is applied to the input pin, the output pin generates a low signal (ground voltage defined as '0). This simple circuit can be connected to a resistor/capacitor pair to rapidly turn on an off. 4040 Binary Counter/Divider: This simple logic chip takes an input square wave and generates oscillations at 8 outputs with a frequency related to the input frequency. 4051 Eight Channel Analog Multiplexor/Demultiplexor: The voltage status of the three address pins A, B and C determines which of the eight channels presents its voltage to the common connection pin. Note: All schematics on this site use the following notation for potentiometer tapers: A = Logarithmic, B = Linear Using Your Effects!

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Send and Receive MIDI with Arduino : Receive MIDI Messages with Arduino Most Arduino MIDI projects send MIDI messages out, but you can also use the Arduino to receive MIDI data. Here are some ideas: an Arduino synthesizer that uses MIDI messages to construct audio waveforms a device which uses MIDI to trigger mechanical events, like the ringing of different sized bells a MIDI to control voltage(CV) device- communication between MIDI and analog synthesizers Parts List: MIDI connector Digikey CP-2350-ND 220Ohm 1/4watt resistor Digikey CF14JT220RCT-ND 1N4148 diode Digikey1N4148-TAPCT-ND 10kOhm 1/4watt resistor Digikey CF14JT10K0CT-ND 470 Ohm 1/4watt resistor Digikey CF14JT470RCT-ND (I used 2x220 instead) 6N138 optocoupler Digikey 751-1263-5-ND The hardware setup is slightly more complicated for receiving MIDI than it is for sending.

fun with sea moss (or, basic digital sound devices) by Sebastian Tomczak. Please email for blah-blahing Please note that the construction of a square wave oscillator using a hex inverter integrated circuit and then using it to control a digital binary counter integrated circuit is taken from the excellent reference: pp 111-139. Collins, Nicolas 2006, Handmade Electronic Music: The Art of Hardware Hacking, TF-ROUTL. Index Digital Logic

Synth Secrets, Part 16: From Sample & Hold To Sample-rate Converters (1) Gordon Reid introduces the synthesis modules that allow you to create a number of commonly used 'random' effects, and their close relatives -- analogue sequencers. This is the 16th article in a 63-part series. Read all parts. You might think that after more than a year's worth of articles about oscillators, filters, amplifiers, LFOs, contour generators, external signal processors, and heaven knows what else, we would have exhausted the modules that make up an analogue synthesizer. Not a bit of it! This month, we're going to start with a common synth component, the Sample and Hold module, and consider its use with a few less common ones.

MIDI Library, For Communication With Musical Instruments MIDI, by Francois Best, allows you to control and receive data from musical instruments. MIDI 2.6 and 3.2 and later support all Teensy models. Hardware Requirements MIDI uses the UART to communicate with standard MIDI devices at 31250 baud. This is completely separate from, and can be used together with USB MIDI. Juergen Haible "Living VCOs " back to JH. homepage I already have a lot of different VCOs, from the ultra precise MOTM-300 to the lush, but not so well-tracking VCOs of my EMS-Synthi clone. DIY @ Detachment 3 Laboratories - ph33r t3h m4g1k sm0k3 The Master Synthesizer Book List r1.1 This is intended as a one-stop reference for analog and digital synthesizer design, covering both the specifics of design and the general fields that encompass them. Wherever possible, I have used books from Dover Publications because of their technical depth, illustrious authors, and budget-minded pricing. Embarking on a self-taught engineering path can be expensive, though not as costly as a formal education in Electrical Engineering or Computer Science.

Interesting WTPA2 MIDI Opto Repair - Narrat1ve Nerd Camp So, while I was testing these pre-assembled units, I found one that had intermittent MIDI functionality. The symptoms were these: Mess with MIDI keyboard, MIDI works normally. Wait 20 seconds. The first NOTE_ON or NOTE_OFF after that fails. ECE4893A: Electronics for Music Synthesis (Spring 2010) Office: Centergy 5212 (but I'm almost never there) Phone: 404-385-2548 (but I almost never answer it) E-mail: (by far the best way to reach me; please include "EMS" somewhere in the subject of class-related e-mail so I can find it quickly)Course website: Prerequisites: ECE3040 and ECE3041 (with concurrency allowed, i.e. you can be taking ECE3041 this semester and be OK). Basically, I need some familiarity with op amps, diodes, and transistors, and I need to make sure that you have had some experience using a scope by the time you will to use one in EMS. (Oscilloscopes are introduced pretty early in ECE3041, which is what makes the "concurrency" part OK) Website for previous offering: EMS (Spring 2008) - will help give you a feel for what the class is like

Analog Modular Synthesis undefined Copyright 1997 by André C. Stordeur Shruthi – DIY resources This section contains all the information allowing you to build your own Shruthi or hack its firmware. The Shruthi contains two section: a digital section (“control board” or “digital board”), containing the display, main microcontroller, switches and pots ; and an analog section (“filter board”) hosting the VCF, VCA, input mixer and the output stage. Several variants of the filter board are available to provide a broad range of sounds. Control board This circuit probably looks all wrong – we’ve got an NPN transistor with its base connected to ground, the emitter connected to the positive supply railvia a resistor and the collector hanging out in the breeze! If we’re trying to build an amplifier, yep, this circuit has real problems. But if we’re building a very simple white noise generator, then this circuit is perfect.