LEAP#332 RC Phase Shift Oscillator
Three RC high-pass filter poles add more than 180˚ phase shift on top of
the 180˚ contributed by a class A BJT inverting amplifier with enough gain to sustain positive feeback.
And that’s all you need to make an oscillator.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#331 Getting Blinky with PIC Assembler
Not necessarily everyone’s first choice for embedded development these days, PIC is perhaps now more a right-of-passage! It was Julian Ilett who finally inspired me to try this myself. One thing that held me back was the perception that you have to “downgrade” to Windows in order to get anything going. Challenge accepted, and I quickly learned that the MPLAB X IDE is just perfect and makes PIC development on MacOSX a piece of cake. So let’s get blinky.. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#330 Any-to-any Polarity DC Power Adapter
I recently got a device that has a 2.1mm power connector but in centre-negative configuration.
Unfortunately I don’t have any centre-negative power packs on hand. I could of course just rewire one,
but decided it might be the time to make up a generic any-to-any connector.
In addition to centre-positive and centre-negative output plugs, I included
a 9V battery bypass and polarity rectifier, so that the input supports both centre-positive and centre-negative connections.
And of course an LED power indicator.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#329 On DC Power Connectors
How many types of power connector is there? In addition to just two bits of wire twisted together, it is pretty much an uncountable selection!
Just some notes on the main types, including bypass configurations.
As always, all notes are in the Little Electronics & Arduino Projects repo on GitHub
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