I have built an improvised trainer that uses a guitar tuner’s tone generator feature to generate the tone needed to operate a Morse code key. The tone generator (guitar tuner) and the power supply (two AA batteries) are tightly placed in a small pocket-sized enclosure with a straight key mounted at the top, making the Morse code trainer a bring-anywhere ultra portable tool for code practice.
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Related link: Morse Code Exam (Philippines)
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© Anthony Urbano (Manila, Philippines)