IC 555 is a basic timer IC for hobbyist or electronic engineers. This app is used to calculate monostable and astable circuit Features: 1. Calculate monostable circuit 2. Calculate frequency of astable circuit 3. Calculate component values of monostable and astable circuit. Save component values in CSV file (Excel file) Features in PRO version only: 1. Selectable preferred value of resistors and capacitors 2. Share CSV file to other apps 3. No limitation 4. No Ad Note : For those who need