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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LEAP#231 LED Dimmer (current regulator)
I was looking at some alternatives for dimming a 12V LED strip. This circuit is by Jim Keith at electroschematics.
Rather than using PWM, this circuit controls the current and provides better flicker-free lighting even when dimmed.
Very nice!
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#230 Minimal LC Oscillator
I borrowed this idea and circuit design from stoneslice’s 1MHz Oscillator video.
I tested a range of components across a range of frequencies from 1.5MHz to 2.9MHz.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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