Trigger circuit unit for operating light emitting members such as leds

Abstract

A trigger circuit unit including: a forward circuit block having a pickup circuit such as a microphone for picking up a signal of music so as to convert it into an electric signal; a filter circuit for selecting a portion of the band from a picked up audible frequency band; and a limit amplifier circuit mainly composed of an inverter operation logic IC for amplifying the selected electric signal having a portion of the band and transmitting an output having a predetermined amplitude; and a waveform conversion circuit block having a time constant circuit connected to the output of the forward circuit block and composed of a capacitor having one or more diodes connected in series and a resistor in order to prevent a backflow and to obtain a forward directional voltage difference, wherein analog pulse signals transmitted from the time constant circuit are caused to perform a Schmidt operation having a previously adjusted degree of hysteresis, wherein the rectangular pulse signals transmitted from the waveform conversion circuit block in accordance with the electric signals which correspond to the music signals each having a partial band picked up, selected and amplified in the forward circuit block are transmitted as basic trigger signals for operating light emitting members such as LEDs or motors.