LEAP#243 Switches
Switches are the most basic of input devices for electrical and electronic systems.
Thorough coverage of the variety of switches can be found in works such as
Charles Platt’s excellent Encyclopedia of Electronic Components Volume 1,
and John M. Hughes’ Practical Electronics: Components and Techniques.
These are my notes on nomenclature and specific components - available in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#242 Minimal Pierce Oscillator
The Pierce oscillator is a derivative of the Colpitts oscillator, and can be implemented using a minimum of components. Typically: a digital inverter, one resistor, two capacitors, and a crystal. The circuit I’m testing here is from KF5OBS,
which cuts this down even further by using a BJT in place of the digital inverter and taking advantage of the base-emitter capacitance to eliminate one capacitor
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#241 General Purpose 358 Amplifier
There’s always room on my bench for another general purpose amplifier.
This is another LM358-based Op-Amp audio amplifier circuit, but it turns
out to be not so useful. As-is, it suffers from two issues.
First R8=1MΩ provides ridiculous gain, so most signals over 50mV or so slam to upper/lower output limits.
Second, the push-pull output stage can’t deliver much power.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#240 Digital Input with Analog Pins
This is a simple demonstration of a tip shared in the Arduino Tips and Tricks email newsletter.
On the Arduino Uno, there are 6 analog pins. While we’d normally use AnalogRead to read A/D values and
AnalogWrite to write PWM, they can also be used as GPIO digital pins.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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