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Instrument Developer's Kit Board and Schematic

Page history last edited by Michael Harradon 13 years, 9 months ago

 

Exertion Instrument Developer's Kit

 

Connect this board to a generator and a speaker to make a basic exertion instrument!

 

As this board accepts power from a stepper motor or other current source, it is boosted to run a microcontroller and amplifier.  The micro produces the sound which gets amplified and sent to the speaker terminals.  You can a speaker directly to the terminals.  The bigger and louder the better. 

 

Plugging in a keyboard and knobs/potentiometers will change the sound. 

 

If you like, you can put your own code for your own instruments into it. 

 

 

This board is the power supply booster and CPU for an Exertion Instrument.  It is designed to generate the highest possible voltage from turning a generator's shaft even a little bit. 

 

To do this, it uses two voltage doublers in series, one from each pair of wires on the stepper motor.  Whenever the total voltage from the phases, plus the temporary capacitors is greater than 1.5V, a 551 timer (low-power version of the 555 timer chip) begins oscillating, which boosts the voltage to 3.3V or higher to run the microcontroller and amplifier.

 

This board includes the simplest possible amplifier:  a single TIP120 NPN transistor connected to a programmble output pin on the microcontroller.  The TIP120 can be replaced with a large number of similar ones, such as TIP102, etc.  A potentiometer in series with the transistor's base limits the current from the CPU to limit the overall volume, making waveforms last longer instead of louder.

 

The CPU is programmable with an FTDI FT232 USB serial port @ 57600 baud. 

 

 

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