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120 VAC digital input?


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notsosure



Joined: 24 Jul 2003
Posts: 1


Post24 Jul 2003 22:32   

120 VAC digital input?


Is there a stand alone digital input board accepting 120vac inputs?
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Post24 Jul 2003 22:32   

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flatulent



Joined: 19 Jul 2002
Posts: 4875
Helped: 324
Location: Middle Earth


Post24 Jul 2003 22:38   

reduce input


for safety reasons, you should not connect any circuit directly to the power line. Use a step down transformer to both provide safety isolation and reduced voltage.
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sklux



Joined: 30 Jan 2002
Posts: 58


Post27 Jul 2003 23:49   


I know that digital input cards of plc's often does support that voltage but
I suppose you are looking for something connected on a PC
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House_Cat



Joined: 21 Feb 2002
Posts: 1507
Helped: 307
Location: USA


Post28 Jul 2003 0:03   


Take a look at the link below:

(replace * with t below)

h**p://www.adac.com/catpages/5608aci.html
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ASIC



Joined: 18 May 2001
Posts: 221


Post03 Aug 2003 10:37   


There are special I/O modules available for this purpose. Check Potter & Brumfield website

http://catalog.tycoelectronics.com/TE/bin/TE.Connect?C=15155&M=FEAT&P=&LG=1&I=41&G=G&LBOX=78077

ASIC
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goodboy_pl



Joined: 12 Mar 2002
Posts: 243


Post26 Aug 2003 18:15   


If u want to measure mains voltage/current the best solution is to use isolators like CT(current transformer) and PT(voltage transformer), for low current/low voltage and precise measurment also there is another option: linear opto coupler like IL300 from www.infineon.com with a bandwidth of 100KHz, for lower bandwidth (10KHz) u can use isolated opamps which use pwm tecknique and transformer to transfer sampled voltage amplitude throgh trandformer.

If u want to control (switch) mains voltage use pulse transformer and triac or opto triacs.

BEST!
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