Digital input with voltage from 5VDC to 230VAC

[shorty]

hello

is is possible do create a digital input (for a PC IO Card)
with a variable input voltage from 5VDC to 230VAC -optocoupled
without jumper, the speed is not important
(like multimeter automatic range switch )

Thanx
Peter

 

[batdin]

opto coupler 230vac

Generally-yes.
But to get a more specific answer,give some details.

 

[mrcube_ns]

optocoupler 230v ac

For 5V its simple just via resistor apply input voltage to optocoupler.

230V is little more complicated. There are you need to add resistor and capacitor in seria with diode in optocoupler and you have to add inverse diode parallel to input diode of optocoupler to protect input diode of inverse (230V*1.41)V. Capacitor you calculate like resistor:

Rc=1/(2*3.14*f*C)

to get much current to switch on optocouplers secundar when 230V is ON.


Regards.


Mr.Cube

 

[conkhicon]

220vac to 5vdc using resistor and capacitor

Hi alls
You should prefer Frequency Measument Circuit in VOM (Universal Measument)
220VAC and TTL ossilator was measured in the same methode in VOM

 

[barrybear]

inputs 230vac opto

It is allways best to use zener diodes to prevent spikes on input to io board

Barrybear