Touch delay light circuit using music IC

It is a touch delay light circuit using a music IC . It cleverly uses
the storage IJJ energy beam of the music IC to achieve delay control
.
    VI), vs, (1, f17 form a
simple capacitor stack half-wave rectification and
voltage stabilizing circuit. After the power is turned on, a DC voltage of
about 3v can be obtained at both ends for the music integrated block CIC2851. M To touch the threshold chip, when you touch it a few times, the clutter signal induced by the human body is amplified by the composite tube composed of VT1 and VT2 . When VT2 tends to conduct, a positive polarity touch signal is input to the trigger terminal ② pin of CIC285! Generate electricity II. The music TC is triggered, and the third pin outputs the stored music signal to turn on the transistor v3. The transistor VTH obtains the trigger current and is turned on accordingly, and the lamp F is lit. . When the music stored in the music IC is finished playing, VT3 returns to cutoff, VTH loses the trigger current, turns off when the AC crosses zero, and the light E goes out.     (:1(-, Z801 is connected to an external oscillation resistor R. The standard value is bSkC2 , the sound of playing music is about ZOs . Now increase the oscillation resistance R to 3.kn. Therefore, the oscillator oscillation frequency is reduced and the note reading rate is slowed down. In addition, the delay time can be increased by K. The data shown in the figure is approximately is imin. Readers can increase or decrease the resistance value of R: to measure the delay time of the festival lamp lighting at will . This circuit can also use the ordinary KD-9300 series Ale integrated circuit, but generally this series of Hele 1C is not With an external oscillator, the delay time of the circuit is fixed by the circuit inside the chip. Generally: about 20s .