Posted on Jul 20, 2012

When digital data is transmitted over long lines (longer than 1 meter), proper transfer is often disturbed by the parasitic effects of ground level shifts and ground loops, as well as by extraneous noise picked up along the way. An optocoupler, such as the HilL, combining galvanic isolation to minimize ground loop currents and their concomitant common-mode voltages, with predictable switching levels to enhance noise immunity, can significantly reduce erratic behavior.

Click here to download the full size of the above Circuit.

Resistor Rs is programmed for the desired switching threshold, Cs is an optional speed-up capacitor, and CR1 is an LED used as a simple diode to provide perfect line balance and a discharge path for Cs if the speed-up capacitor is used.

Leave Comment

characters left:

New Circuits



Popular Circuits

Wide frequency oscillator
Flip-Flop Debouncer Switch
Temperature Controller
Audio Triangle Square Wave Generator Using Op-Amp
Water tank overflow liquid level sensor alarm circuit
Wiring up to the AN2131
Preamplifier For Soundcard
Scalextric Lap Counter
The FM demodulation circuit using TA7343