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Morse code practice key

von Samwisesailor

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I needed a simple, all in one practice key that I could use to introduce some high school students to sending and copying Morse code. This design is a riff on the design by guypl who made a single print version which used a single AA battery and a 3V active buzzer this is inexpensive and easy to source on Amazon (the 1.5 V battery operates the 3V buzzer just fine).
https://www.amazon.com/QMseller-Terminals-Raspberry-Electronic-Continous/dp/B07VRK7ZPF/ref=sr_1_3?crid=3LWJQWUADY7GB&dib=eyJ2IjoiMSJ9.qEyzL2ee01JGpGr1tGW-e94aTit5t4aWyuYZkXv1Y8yh7KPiwGtALdsYItz2UTKfWGIwqjUVpEsi2YboE6acLARA0dkLXV1cD-q3Po_g-bWJaP-12oB4CC4mhIyTI9k-oxEntnZEzk7Uf_9hoVqix_FU6n4OeiA8m5ddLjODhroWp1jlqqPT6GFo858JJYxyTowrsh9SuQfKclwyQRYkyGvGv_4N4rIgIAen55w87Bg.HhgnilqMD3zhG3o7id7mAXcJzh0czJFKSwkHsLSIPWU&dib_tag=se&keywords=3v+active+buzzer&qid=1774447135&sprefix=3v+active+buzzer%2Caps%2C279&sr=8-3

I found that design a little tough to wire up using paper clips as directed and so made some modifications that make it e