VH5162 is a CMOS-type control circuit Lantern Festival It has four lights drive output, eight operating modes. It is formed by the lantern festival with "good luck" voice control circuit as shown. Changing patterns of work by the clock sequence control method, which by the unijunction relaxation oscillator clock generator provides the trigger. VT1 (BT33) and R1, RP1, C1 and R2 composed of low-frequency relaxation oscillator, its oscillation period is:
where is the ratio of partial pressure of unijunction general =0.35 ~ 0.55.