Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Crystal AM transmitter (CB20584E)
This short-range transmitter has the frequency determined by the crystal. The frequency can be...
SX9310 Ultra Low Power SAR Proximity Sensor - Semtech
September 2017 - Semtech's proximity sensors SX9310 with Specific Absorption Rate (SAR) can be...
Circuit for sleep mode (CB8430E)
This circuit was found in a 90s Electronic Design. It uses integrated circuits that are not common...