@VE1BLL and Comcokid, thanks for the inputs. Please check the updated circuit. Are the chosen cap values suitable? Since I am ordering the PCB do you think I should go with ceramic SMDs caps or regular leaded ceramic caps? I am asking because the rest of circuit is based on regular leaded...
The following circuit is an input section of a break wire alarm. The sensor is a 20m long wire which activates the alarm when broken. The wire keeps the logic input low and when it's open the logic input goes high. The first priority in designing this circuit was robustness against false alarm...
