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\$@\$
Newbie

Posts: 18

 « on: January 24, 2006, 12:05:32 AM »

hi! i'm a newbie here.
with shematics diagrams.....

PS : I'm using 2s28 optocoupler
thanx
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gogo2520
Electronics God

Posts: 610

If I were smart I wouldn't have to study so hard

 « Reply #1 on: January 24, 2006, 11:46:13 PM »

Hello ronald and welcome
Heres a small tutorail on opto's
Have fun gogo
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\$@\$
Newbie

Posts: 18

 « Reply #2 on: January 26, 2006, 11:51:54 PM »

Thx, but i don't use ic optocoupler. I means not exactly optocopuler but
"distance sensor" which consist LED infrared and phototransistor.
I'm really confused.......can i get some tutorial...... pls....
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audioguru
Electronics God

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Posts: 14188

I'm a theory expert! \$crooge and I are thrifty.

 « Reply #3 on: January 27, 2006, 12:34:10 AM »

Your IR distance sensor is the same as an optocoupler. The difference is that distance causes the phototransistor to receive less IR because the IR beam spreads out and therefore its energy is divided over the wider area.
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\$@\$
Newbie

Posts: 18

 « Reply #4 on: January 27, 2006, 02:03:35 AM »

Oh I get it...
Can u tell me where the schematics of IR distance / optocoupler
Coz  I hav a trouble with the output voltage, the output was variation beetween
0-5 voltage not exactly 0v or 5v....
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audioguru
Electronics God

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Posts: 14188

I'm a theory expert! \$crooge and I are thrifty.

 « Reply #5 on: January 27, 2006, 08:04:58 AM »

I hav a trouble with the output voltage, the output was variation between
0-5 voltage not exactly 0v or 5v.
There are many types of optocouplers: transistor, Schmitt-trigger logic, FET. You are probably using one with a transistor output. The transistor is linear so its output voltage depends on the strength of the IR beam that is shining on it.
If you want the transistor to conduct hard then shine a strong IR beam on it. If you want the transistor to be cutoff then turn off the IR beam. Or use an opto-coupler with Schmitt-trigger logic at its output.
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\$@\$
Newbie

Posts: 18

 « Reply #6 on: February 13, 2006, 07:02:38 AM »

Thx......
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