This Design Idea implements a remote sensor preamp (e.g., for a piezoelectric transducer) which transfers both signal and power over a single wire pair or. ... The best solution is the simple Q1 ...

Remote Tester Circuit. November 28, 2009 by D Mohankumar Comments 14. ... When the remote handset is focused on to the sensor and any one button is pressed, buzzer beeps and LED blinks indicating that ...