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Zener Diode Low Voltage Alarm
Today, we are going to build a low voltage alarm using a zener diode and an LM393 comparator.
Zener Diodes as Voltage Reference
What can we use zener diodes for? This time, we look at their use as voltage references.
Avalanche Breakdown
Let's learn more about the second important breakdown effect in zener diodes: the avalanche breakdown.
Building Dark Activated LED Lights
Let's learn how to build dark activated LED lights to brighten up the dark time of the year.
Zener Effect
The zener effect is the dominant breakdown effect in low voltage zener diodes. Let's take some time to learn more about it.
Zener Diodes
It is a special type of diode designed to operate reverse biased: the zener diode.
Diodes as Input Protection
They are a very effective protection against over voltage and reverse polarity. Let's look at how diodes can be used as input protection.
Flyback Diodes
It is a necessary component in many circuits with inductive loads: the flyback diode.
Full-Wave Bridge Rectifier
It is used in many products and is de facto the standard rectifier: the full-wave bridge rectifier. Let's discover how it works.
Half-Wave Rectifier
A popular application for diodes are rectifier circuits. Today, we are going to look at a simple half-wave rectifier.
Low Voltage AC Source (Summary)
Let's look back at what we learned in this project series and talk about which solution fits which use case.
Low Voltage AC Source (Part 10)
Last time we built an AC source using a transistor H-bridge. This time, we replace the transistors with MOSFETs to improve the efficiency.
MAX3010x Pulse Oximeter Modules (Part 4)
The MAX3010x sensors can do more than just heart rate measurements. Let's do some pulse oximetry.
MAX3010x Pulse Oximeter Modules (Part 3)
Our previous approach for heart rate measurements didn't work very well. It's time for a better and more scientific algorithm.
LED Candle (Part 2)
Let there be light! Today we are building the electronics for our LED candle.
LED Candle (Part 1)
Winter is back and the days are getting shorter. Let's build a light: an LED candle.
MAX3010x Pulse Oximeter Modules (Part 2)
Now that we can acquire data with MAX3010x modules, it's time to apply our heart rate detection algorithm to it.
MAX3010x Pulse Oximeter Modules (Part 1)
It's time for some more advanced heart rate sensors. Today, we are going to take a look at the MAX3010x pulse oximeter sensor family.
Heart Rate Module (Part 3)
As promised, we are going to look at another solution for detecting heart beats. This time without using a buffer.
Heart Rate Module (Part 2)
In the last part of this tutorial, we already tried out the KY-039 module. Today, we are going to implement a proper heart rate detection.
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