March 24, 2016

• Collin's Lab: Hacking the Korg Monotron

January 6, 2016

• Korg's Little Bits Synth Kit
• Open Source: Eagle (Schematic and Board) Files for the Modules (Github)

December 21, 2015. Logic Noise (HackaDay)

• 4046 Voltage-Controlled Oscillator: Part 1.
• Playing in Tune with an Exponential VCO
• Digital-to-Analog with an R-2R DAC

December 20, 2015.

• (Phase-Locked Loops) Amazing Excel site: http://excelunusual.com/phase-lock-loop-pll/
• Basics of Phase Locked Loops and Frequency Synthesis
• Instructables: Keyboard UI with Audio Output
• Creating Sound Waves with JavaScript: http://js.do/blog/sound-waves-with-javascript/
• DaVinci Learning: 1.Viewing the 4046, 2.4046 Siren, 3.Altogether Now: The Phase-Lock Loop

November 20, 2015. Here's a example of a retro LED matrix visualizer for a wave form that resulted from a high school project from the '90s: Oscilloclock,

November 17, 2015. (J. Russett post to Forum). Hey guys, I have a block diagram of the Korg Monotron which answers one of the more important questions we had today: How would we combine our own generated audio signal with an input signal? Below you can see that Korg has accomplished this task is by feeding the two into one signal before doing any filtering (in the Voltage Controlled Filter, VCF). After filtering, it passes all signals out to the speaker or into an aux cable.
Reference: http://www.residentadvisor.net/review-view.aspx?id=7888

November 15, 2015. Tutorial: Filters

November 14, 2015. The CD4046 PLL/VCO

• CD4046BE Datasheet
• Tutorial Series: 4046 VCO

November 13, 2015: Synthesizer Links

• ELP: Lucky Man (3:22)
• Birth of a Synth: Scott Stites and Henry Thomas
• MFOS: DIY Synths
• MFOS: DIY Synth Panels, Part I
• MFOS: DIY Synth Panels, Part II

November 12, 2015: Introductory Sound Tutorials

1. Frequency and Sound Tutorial #1. Basic Sound Theory
2. Frequency and Sound Tutorial #2. Simple Waveforms Combined
3. Frequency and Sound Tutorial #3. Phase/Phaseshift
4. Frequency and Sound Tutorial #4. Harmonics and Harmonic Distortion
5. Equalizers 1. Equalizing Basics
6. Equalizers 2. Analogue vs Digital EQ
7. Equalizers 3. How to Become Good at Equalizing
8. Equalizers 4. Practical Equalizing. Session 1
9. What is the envelope of a sound? (ADSR Explained)

November 11, 2015: Jackson's Synthesizer References

• If we are going to input an audio signal it could be useful to split that signal into high, mid, and low frequencies. Here is the schematic of a colour organ. Colour organs were used for simple music visualization before computers, and you can see the the three sections for each range of frequencies below:
  
  
• Next, if we are going to work with audio signals we may need to employ the use of negative voltages. Here is site that explains some ways of creating a negative source, or "virtual" ground as it's called: http://tangentsoft.net/elec/vgrounds.html
• Regarding the synth module, I've found a comprehensive gif that explains all the components of an analogue synthesizer. If we do choose to build this, there are many opportunities for specialization, if anyone else is interested.
  http://www.cubisteffects.com/images/Technotari/analog_synth_101.gif
• Another technical part of signal processing is the use of operational amplifiers. Here is the link to the datasheet for the LM358 op amp: http://www.onsemi.com/pub_link/Collateral/LM358-D.PDF . On page 9 there is a schematic for a function generator, which will be useful for us.
  

November 10, 2015: Jamie's links to existing products

• Moog Werkstatt-01
• Teenage Engineering Pocket Operators
• Korg Monotron

November 6, 2015: Conception

Definitions

• Impedance: Resistance (real number) and Reactance (imaginary number)

Software-Based Sound Manipulation

• Audacity(Freeware)

Interesting Audio-Related Components and Circuits

• 42TL013 Transformer (Evil Genius): Datasheet
• EL Wire & Display
• DC Input / AC Output Circuit

TL013 Audio Transformer	DC Input / AC Output (look familiar?)

Previous ACES Projects

• Altoids Tin Speaker (2009-2011) (Video)

ACES' Altoids Tin Speaker Circuit	Ting-bot

Resources

• Rattlesnake Design option? Kickstarter Ting-bot Ting-bot (0:46)
• Chapter 4 of your Grade 10 Evil Genius workbook provides a gentle introduction to sound projects