This circuit was found in a Popular Electronics of the 1990s. The sensor is a rotating mechanical system with a propeller-driven magnet to count pulses with a reedswitch.
This CMOS circuit divides the frequency of a rectangular signal up to 2 MHz by 6. The supply...
PIC16F19197 Microcontroller Family Combines Battery-Friendly LCD Drive with Core Independent...
This source draws a fixed constant current of 1 mA using a Norton operational amplifier. Other...