LEAP#282 Function Generator Kit
The XR-2206 monolithic function generator is a pretty capable chip that can do a whole lot more
than is required for this function generator kit (like sweep and AM/FM synthesis).
The part now appears to be obsolete however, which probably explains why it is showing up in a flood of kits similar to this one.
Performance is remarkably good.
The main drawback is no feedback or calibration of actual frequency and amplitude being generated.
If the details matter, it is necessary to also hookup an oscilloscope or frequency counter.
Of course this also means there’s no warning or protection against clipping the output signal.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#281 Three-stage FM Transmitter
The dazaro3 Youtube channel has some of the simplest and most practical FM transmitter circuits around, with a bonus that he actually shows them working.
I first experimented with his
three-stage transmitter on a breadboard (LEAP#280)
and got such good results that I then put it in an Altoids can, and finally bought a legit one from dazaro
as a benchmark and a bit of payback for sharing such great designs.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#279 Single-stage FM Transmitter Kit #2
I picked up another FM transmitter kit because it was too cheap to ignore.
Initially transmitting slightly high on the FM band, some adjustments of the LC tank
got it down to working quite decently around 92MHz.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#278 Component Tester Kit
Component testers are very handy things to have around.
They are also interesting bits of kit to design and build, as you get to play around in the fascinating niche of test equipment and techniques.
I was interested in testing out this particular Atmega328-based kit, as it is representative of a whole class of simialr products
that all trace their history back to original open source work by the folks on www.mikrocontroller.net.
It took a few hours to construct, and fired up perfectly. I have built similar circuits myself, but nothing yet with the complete feature list this kit offers.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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