LEAP#235 AudioDSP DIY Shield for Arduino
I wanted to try some digital signal processing on the Arduino/AVR for some time.
This project started a breadboard-build of a circuit based on the pedalSHIELD by electrosmash, just to see if it was even half-way decent.
When that worked out, I put it on protoboard and did a bit more work on the software (refactored the core routines into an AudioDspDriver library).
Along the way I also got the genuine kit from electrosmash.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#234 CMOS Inverter Oscillator
I found this oscillator circuit used in the
LEAP#182 PowerSupply317Kit.
It is another variation of the basic Schmitt Inverter Waveform Generator pattern, which I tested in
LEAP#022 SchmittOscillator.
But performance … is quite terrible actually. Oscillation is only sustained for a small sweep of the 100kΩ pot.
The waveform is also heavily asymmetric - with a duty cycle at most 25%.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#233 Hi-side PWM Controller
This circuit cobines a variable-duty cycle PWM generator with a high-side p-channel MOSFET driver circuit,
making it suitable for controlling loads up to 15V/23A.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#232 LED Dimmer PWM
In LEAP#231 I claimed current control was better
than PWM especially for flicker-free low light levels. But is that true?
In this project I test a simple 555 Timer-based PWM dimmer for comparison’s sake.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
And yes, of course it flickers. Whether that is noticable or annoying depends on the frequency.
Now perhaps some flicker might be a Very Good Thing, if the research discussed in this RadioLab episode bears up in practice. But flicker should still be something you explicitly design to have or eliminate.
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