![]() ![]() Thus, DAVS 13 provides an output of click amplitude at three levels, i.e., Loud, Medium, and Soft. Transistor Q3 and resistor R12 operate in the same way as Q2 and R13 except that they produce an even lower voltage level. The capacitor then charges to a lower voltage which produces smaller amplitude acoustic clicks. If transistor Q2 is turned on by the control logic, the resistor R13 will be switched in to shunt the capacitor C9 and form a voltage divider between resistors R9 and R13. ![]() This charge is then available for discharge through the loudspeaker 32, which produces the maximum amplitude acoustic click (the "accented" click). If neither Q2 or Q3 is turned on, the capacitor C4 will charge to the full 30 volts. The 30 volt power is applied through R9 to charge the capacitor C4. The transistors Q2 and Q3 are connected in common emitter configuration in parallel with the capacitor C4. The inverters U2C and U2D provide impedance translation between the microcontroller output and the input terminals (bases) of the transistors Q2 and Q3. DAVS 13 is comprised of resistors R9 to R13, capacitor C4, transistors Q2 and Q3, and inverters U2C and U2D. The digital adjustable voltage source (DAVS) 13 provides the audible click of the metronome to the headphones 30 or loudspeaker 32. The microcontroller for the metronome unit can be programmed with any combination of time signatures, rhythms, or patterns with desired cues or accents. The metronome unit includes a display for menu selection, prompts, and visual cues for adjustment of the tempo and selection of types of clicks in a beat pattern. Headphones, an audio speaker, and/or an LED indicator can be used to provide audible and visual cues of the tempo to the user. A digital pulse voltage source and acoustic pulse switch are responsive to control logic to produce different amplitudes and tones for three types of clicks, i.e., Loud, Medium, and Soft, in order to provide distinctly different audible click patterns. The user operates a footswitch to increase the tempo automatically in continuous increments and to hold a desired tempo. A microcontroller is pre-programmed with a metronome click pattern in any selected note duration value.
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