Single chip timing alarm

Shown is a single chip timer alarm. The alarm uses 14-bit binary serial counting, frequency divider CD4060, plus resistor-capacitor
components and transistors. Among them, CD4060, resistors RI and R2, capacitor CI, and IC internal gate circuit form an oscillator. When the power is turned on, the differential reset and clear circuit
composed of C2 and R4 gives a sharp pulse to the R pin of CD4060 to reset the IC and start counting . When the count reaches level 14 (Q13), the @ pin of IC is at high level, VT1 is turned on, and the speaker makes sound. Indicates the end of the timing . Select appropriate Cl and Rw to get the corresponding delay time.