This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset current setting. The configuration can be adapted to operate with modern equivalent components.
Vishay's VCNL4200 integrated circuit consists of a fully integrated proximity detector containing...
We find this circuit in a 1976 NASA handbook. The circuit can be designed based on current logical...
This circuit indicates the logic level of a digital signal. LEDs can replace the lamp, wired with...