Door buzzer or alarm (CB20492E)

This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose NPN.

SX9310 Ultra Low Power SAR Proximity Sensor - Semtech
September 2017 - Semtech's proximity sensors SX9310 with Specific Absorption Rate (SAR) can be...
Gain 50 Current Sensor (CB5388E)
We found this simple gain-50 current sensing circuit in a 2005 Linear Technology publication. The circuit...
Series SP8008 Diodes Arrays
April 2017 - Mouser Electronics is supplying the SP8008 line of diode arrays of Litelfuse. The new...