The audio driving circuit for the logic probe. NE555 based. Intended to be used with a piezo-buzzer as the audio output device.

Buzzers Transducer, Externally Driven Piezo 3 V 3mA 4kHz 70dB @ 3V, 10cm Surface Mount Solder Pads The CMT-1603-SMT-TR is a compact, surface-mount piezoelectric buzzer transducer designed for applications requiring an externally driven audible indicator. Featuring a low-profile 16 × 16 mm package, it delivers reliable single-tone sound output with low current consumption, making it suitable for portable electronics, industrial equipment, consumer devices, medical instruments, and embedded systems where PCB space is limited. Key Features: Piezoelectric buzzer transducer (externally driven) Surface-mount (SMT) package with solder pad terminals Compact 16 × 16 × 2.8 mm low-profile design Low current consumption (~3 mA typical) Resonant frequency of 4 kHz Sound pressure level of 70 dB @ 3 V, 10 cm Rated voltage: 3 V Maximum input voltage: 25 Vp-p Single-tone acoustic output Operating temperature range: −30°C to +70°C Tape-and-reel (TR) packaging for automated assembly RoHS compliant #Hashtags: #PiezoBuzzer #AudioTransducer #SurfaceMount #SMTBuzzer #ExternallyDriven #LowProfile #LowCurrent #EmbeddedSystems #IndustrialElectronics #ConsumerElectronics #MedicalDevices #RoHS #commonpartslibrary #audio #buzzer