# CrayonXA (My First 9XA)

Learning transistors, power supplies, 555 timers, Schmidt Triggers, AND gates, darlington transistors and optocouplers all in one shot. It still amazes me this ever worked :)

The circuit for this design originated from <span style="text-decoration: underline;">[Max Miller's 9XA](http://irondmax.com/pdf/ProjectIcarus.pdf)</span> (drawn in crayon)

<table border="1" id="bkmrk-" style="border-collapse: collapse; width: 100%;"><tbody><tr><td style="width: 49.9383%;">[![240662288_4705169929505824_3723763710195030686_n.jpg](http://stanslegacy.com/uploads/images/gallery/2022-06/scaled-1680-/SOVr9QE15JbSjfUb-240662288-4705169929505824-3723763710195030686-n.jpg)](http://stanslegacy.com/uploads/images/gallery/2022-06/SOVr9QE15JbSjfUb-240662288-4705169929505824-3723763710195030686-n.jpg)</td><td style="width: 49.9383%;">[![255806338_4705169809505836_119894751386171394_n.jpg](http://stanslegacy.com/uploads/images/gallery/2022-06/scaled-1680-/ng4cjLDZ1ZZuLOpg-255806338-4705169809505836-119894751386171394-n.jpg)](http://stanslegacy.com/uploads/images/gallery/2022-06/ng4cjLDZ1ZZuLOpg-255806338-4705169809505836-119894751386171394-n.jpg)</td></tr><tr><td style="width: 49.9383%;">[![77026487_2720040918018745_400836674826797056_n (1).jpg](http://stanslegacy.com/uploads/images/gallery/2022-06/scaled-1680-/fZaWqHktg8MjxfZz-77026487-2720040918018745-400836674826797056-n-1.jpg)](http://stanslegacy.com/uploads/images/gallery/2022-06/fZaWqHktg8MjxfZz-77026487-2720040918018745-400836674826797056-n-1.jpg)</td><td style="width: 49.9383%;">  
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[Max Millers' 9XA![image-1656200942895.49.00.png](http://stanslegacy.com/uploads/images/gallery/2022-06/scaled-1680-/7Gg3xEPmyRl4M31B-image-1656200942895-49-00.png)](http://stanslegacy.com/uploads/images/gallery/2022-06/7Gg3xEPmyRl4M31B-image-1656200942895-49-00.png)

A funny video illustrating how I still had much to learn about building circuits :)

<iframe allowfullscreen="allowfullscreen" height="314" src="https://www.youtube.com/embed/2tQNh7vZGUA?t=7s" width="560"></iframe>

More progress on the 9XA. Learning how proper transistor biasing and loading is important for controlling amplitude modulation.

<iframe allowfullscreen="allowfullscreen" height="314" src="https://www.youtube.com/embed/GF0GO3bbr0s" width="560"></iframe>