Use CA3164A BiMOS detector/alarm system. For operation as smoke detector with electromechanical hom (Fig. 40-la), the output of driver at terminal 8 is used. Large npn transistor Q3,-with an active pull-up and transistor Q2 provide over 300 mA of drive current.
For operation as a smoke detector with a piezoelectric hom (Fig. 40-lb), the circuit requires output from a second inverting amplifier at terminallO, as well as the output from terminal 8.