Practical EEG Deep Breathing Metronome: Traditional Chinese Circuit De
In short: Traditional Chinese Practical EEG Deep Breathing Metronome. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 2393 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
EEG machine deep breathing metronomeAt present, most domestic EEG machines are not equipped with a deep breathing metronome, which brings inconvenience to recording EEG. Figure 194 shows the circuit diagram of the deep breathing metronome. Its beat can be continuously adjusted between 15 and 30 times/minute, and it has a 2-minute and 3-minute timer off function.Figure 194Transistors VT5 and VT6 form a complementary multivibrator, and its oscillation frequency is determined by R12, C5, R13 and C6. Adjusting R12 and R13 can make the tone soft and the loudness moderate. VT3 and VT4 form a low-frequency multivibrator, and its output rectangular pulse signal is added to the base of VT5 through the diode VD2, so that the audio output is controlled by it and emits intermittent beat sounds. …
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