Melody generator ic rvfm m66t 68l melody its a small world generator ic 3 3v operating voltage 16ua operating current 2ma output current 90khz oscillating frequency 10 to 60 c to 92 case 64 note rom memory built in osc resistor level hold mode to play repeatedly dynamic speaker can be driven with external npn transistor suitable for use in telephone and toy applications rvfm m66t 68l melody generator small world non rohs