Simple timer circuit that serves to drive the buzzer or ic optocopler uses 4060 as a motive, please you try this simple circuit and use its output as needed ...
List of components :
TIME SET TABLE
RV1 C2 TIME
500K 220nF 1min-30min
500K 470nF 1min-60min
1M 470nF 1min-120min
R1=2.2Mohm C1=10nF 100V MKT IC1=4060
R2=18Kohm C2=220nF 100V MKT (see table) IC2=4N25
R3=1Mohm RV1=500Kohm pot. (see table) BZ1=buzzer
R4=1.2Kohm D1=LED RED B1=9V Battery or ext. pack supply
R5-6-7=1Kohm Q1-2=BC547
S1=ON-OFF mini Switch
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