CD4060 is a 14-bit counter.
Q14 = 16384
Q13 = 8192
Q12 = 4096
TS asked for 30 to 35 minutes.
34 minutes = 2040 seconds.
Use a 0.5Hz clock and gate the 1-sec high pulse with Q12 (or is it Q13, I still have to check the math).
Use the trailing edge of the gated pulse to reset the CD4060.
Q14 = 16384
Q13 = 8192
Q12 = 4096
TS asked for 30 to 35 minutes.
34 minutes = 2040 seconds.
Use a 0.5Hz clock and gate the 1-sec high pulse with Q12 (or is it Q13, I still have to check the math).
Use the trailing edge of the gated pulse to reset the CD4060.