Learn tones in Cantonese or Mandarin with interactive exercises and vocabulary practice. Practice tone sandhi and use multiple transcription systems like Jyutping, Yale, Pinyin, and bopomofo. Switch between traditional and simplified characters.
by Brent Ho★ 5.011 ratingsEducationFreeData updated 2026-09-06
Design RC, RL, and RLC filters with Butterworth and Chebyshev characteristics. Specify type, order, and cutoff frequency to calculate component values. Generate Bode plots for magnitude and phase response. Export results and save designs.
Learn musical concepts through interactive ear training exercises. Identify tones, triads, and intervals. Improve sight-reading with treble clef practice. Deflect meteorites to progress through levels. Track progress and complete challenges.