LEAP#378 BJT Phase Splitter
Simple unity-gain phase splitter in a little breadboard-compatible package. It uses a common-emmiter amplifier with a gain of -1.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#377 DIY Nokia 5110 Shield
Wiring it up a Nokia 5110 display every time I want a little LCD output is getting a bit tiresome. I have a spare prototyping shield, so A + B = a handy thing to have lying around for the next time.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#376 Piezo Vibration Detector and BPM Counter
I’m experimenting with some piezo transducers (sensors) to capture physical taps as a beats per minute measure with a microprocessor. All the filtering and debouncing of the raw piezo signal is done onboard the ATmega328 using a combination of:
- analog comparator interrupts
- filtering based on musical assumptions
- exponential averaging
The result is a BPM between the threshold of the perceptual present and too fast to be useful.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#374 LT1019 Voltage Reference
I’ve been seeing the LT1019 precision reference show up in a number of designs recently, often as a reference for an ADC such as the LTC2400. It is worth a closer look. In this example, I’m using the LT1019 as an external analog reference for an Arduino.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
read more and comment..