Product description What it does - The scale circle produces eight distinct tones; each key corresponds to a different scale. In an electronic piano or similar instrument, pressing different keys with your fingers selects different pitches. Key benefits — why you need it - Simple tone selection: eight clearly different oscillation frequencies give predictable musical intervals without complex programming. - Reliable analog generation: uses a proven 555-timer oscillator design for stable, repeatable tones. - Easy integration: the circuit is suited to electronic pianos and other 555-based audio projects, making repairs or DIY builds straightforward. - Educational clarity: the resistor-based frequency selection clearly demonstrates how resistance and capacitance set oscillator frequency, useful for learning and troubleshooting. How it works (clear, technical explanation) - Frequency selection is handled by resistors R2–R9. Each resistor corresponds to a different key/position on the scale circle. - Those resistors, together with resistor R1, capacitor C2, and the IC555 timer, produce eight discrete oscillation frequencies. - The IC555 functions as an oscillator whose vibration (oscillation) frequency is determined by the resistance in the circuit (R2–R9); selecting a different resistor produces a different pitch. Key attributes - Function: eight-tone analog oscillator / tone selector for musical or audible signaling applications. - Compatibility: intended for use with electronic pianos and other projects that use a 555-timer-based audio oscillator. - Performance: generates eight distinct oscillation frequencies using a simple resistor-capacitor-IC555 topology for predictable pitch output. - Components referenced: resistors R1, R2–R9, capacitor C2, and IC555 — the parts that define operation and tone selection. Practical use scenarios - Electronic piano module: integrate the scale circle into a small keyboard circuit so each key selects one of eight tones for melody practice or toy instruments. - Educational lab/demo: teach students how resistor and capacitor values control 555-timer oscillation frequency and how discrete tones are generated. - DIY sound projects and alarms: use the eight selectable frequencies for audible notifications, simple sound effects, or hobbyist instruments that require distinct tones. What you get / quick facts - Eight selectable tones controlled by resistors R2–R9. - Oscillator built around IC555 with R1 and C2 forming the timing network. - Tone changes are made by selecting different resistors (different keys), producing different pitches. No extra specifications are added; the description remains consistent with the circuit elements and function as provided.