LEAP#328 555 Timer VCO
The control terminal of the 555 timer can be used to adjust the upper and lower thresholds with an applied voltage.
This produces a very simple voltage-controlled oscillator.
The few measurements I’ve taken show that control adjustments have as much impact on duty cycle as frequency.
That may be what you want … or not!
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#327 Diode Ring Mixer
A DIY build of a double-balanced diode ring frequency mixer, inspired by another
video from w2aew
and the endless treasure-trove that is Experimental Methods in RF Design.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#325 Pimp My Boldport Club Spoolt
Building the latest Boldport Club project - “spoolt”, a solder dispenser. It actually works and now has a place on my workbench. It’s also a nice reminder and inspiration to consider how PCBs can be used as a structural element in design. Of course one essential feature it was missing was LEDs - so I’ve added those myself;-) As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub Here’s a quick demo:
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LEAP#324 EspoTek Labrador
The EspoTek Labrador is a crowd-funded
lab-on-a-board that includes an oscilloscope, waveform generator, power supply, logic analyzer, and multimeter.
I was drawn to the project specifically because it promised open hardware, and multi-platform open source software.
I’m really impressed by my first tests - no trouble getting the board up and running on MacOSX.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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