Optical sensor for PC (CB20548E)

This circuit was found in a PC documentation from 1996. It can be used as a shield with modern microcontrollers.

CMOS Digital Frequency Meter (CB4646E)
This simple digital frequency meter using CMOS circuits reaches 5 MHz frequency. Input signals are...
Maxim Integrated MAXREFDES67 24 bit Universal Analog Input Micro PLC
Maxim MAXREFDES67 Universal Analog Input Micro PLC is ideal in factory automation because of its...
TPS7A19 Linear Regulator with Low Voltage Drop (COM189E)
January 2017 - Texas Instruments' new TPS7A19 Low Voltage Dropout (LDO) linear regulators are now...