555 Piano

Alexander Ryzhkov created a small 555 timer-based piano:

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555 piano

Main goal of this project has been creating pretty designed 555 based piano in small form-factor. Many 555 piano are using 9V battery for supply. I use CMOS timer and for timer need only 3V supply.
The design files are available on GitHub:

githubChirnoTech/555Piano

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Here is a video of the board in action:
openidev has shared the board on OSH Park:

piano.toplayer.zip

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555 Piano

High-speed ADC pHAT for Raspberry Pi

kelu124 designed this board to add high-speed analog inputs to the Raspberry Pi:
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20Msps+ ADC RaspberryPi extension

We haven’t tapped yet into the full potential of the Raspberry Pi in terms of ADC. Some have shown that the first gen of Raspberry could go to 10Msps [..] My take is that the new Raspberry Pi’s  can surely go above. And I want to try it, either with this old CA3306E or with more recent kick-ass ADCs.

The design files are available on GitHub:

github-small kelu124/bomanz

High-speed ADC pHAT for Raspberry Pi

Build a Synthesizer with Darcy Neal in Chicago

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Darcy Neal will lead a workshop in Chicago on building your own synthesizer:

Build a Synthesizer with artist Darcy Neal

Saturday, Apr 15, 2017, 2:00 PM

Pumping Station: One
3519 North Elston Avenue Chicago, IL

2 members Attending

Artist Darcy Neal leads this workshop on building your own synthesizer. Read below for her description:We’ll learn about some of the building blocks of creating a synthesizer using the 4046 VCO and the classic 40106 CMOS ICs. The 4046 is a well documented and powerful IC that can be turned into a modular synth voice with just a few added component…

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We’ll learn about some of the building blocks of creating a synthesizer using the 4046 VCO and the classic 40106 CMOS ICs. The 4046 is a well documented and powerful IC that can be turned into a modular synth voice with just a few added components. Participants will learn to solder together their own prototyping PCB, build a circuit on a breadboard from a schematic, experiment with sensors, and learn the basics about how to produce custom circuit boards using design software like Kicad and Fritzing. No experience is necessary, but basic electronic knowledge or a strong interest in synths will be helpful.

Build a Synthesizer with Darcy Neal in Chicago

Quad Voltage Reference

Barbouri has updated his voltage reference board design:

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Quad Voltage Reference

This is my version 2 board update, which incorporates supply voltage regulation, over-current protection, and trimmer for the 5.000 volt reference all on the same board.

 

The new board uses a LM2937IMPX-10, which is a positive linear voltage regulator IC with a 10V output at 400mA in a SOT-223-4 package.

Barbouri has shared project the project on OSH Park:

Vref-4 Version 2.0 ext Pwr

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Quad Voltage Reference