A magnetometer transducer sampling front-end amplifier (stand alone option) and processor including a transducer, a passive low pass filter, a differential or single-ended amplifier, an output capacitor and discharge control, a voltage comparator, a duty cycle control logic block, a sampling clock and PWM logic block, a gated current source, a system clock and decimators block, and an interval counting detection processor with a target detection output to a system controller.