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redhawk
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Optocouplers and Opto-isolators??

Fri Mar 08, 2013 8:20 pm

I'm current in search for some decent optocouplers I did have a few SFH618A (low current) ones but they're all soldered up into various projects now.

I basically want to attach a few to the Pi's GPIO output pins but without using too much current to drive the internal LEDs.
I've done some searching on eBay and it seems most have a top input current of 60mA the best I've found was 20mA which it's quite on par with the SFH618A low current 5mA requirement.

Can anyone recommend any opto-couplers that while not advertised as low current input device will actually turn on the internal transistor with perhaps 3.3v @ 2 - 10mA instead of 60mA??

Richard S.

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PeterO
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Re: Optocouplers and Opto-isolators??

Fri Mar 08, 2013 8:42 pm

Have you looked at H11L1 s ?
http://www.rapidonline.com/Electronic-C ... ator-76749
PeterO
Discoverer of the PI2 XENON DEATH FLASH!
Interests: C,Python,PIC,Electronics,Ham Radio (G0DZB),1960s British Computers.
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techpaul
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Re: Optocouplers and Opto-isolators??

Fri Mar 08, 2013 10:02 pm

Why search ebay?

Look at Rapid, Maplins, Farnell or many others whoi have stock and returns policies in the UK
Just another techie on the net - For GPIO boards see http:///www.facebook.com/pcservicesreading
or http://www.pcserviceselectronics.co.uk/pi/

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redhawk
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Re: Optocouplers and Opto-isolators??

Fri Mar 08, 2013 11:45 pm

eBay usually have some good deals I also believe delivery times are much better than ordering from places like RS or Farnell which usually demand bulk purchases on certain items anyway.
Thanks for the link for Rapid Electronics for some reason that site has somehow escaped my attention. :)
If it wasn't for the fact I live a fair distance away from Maplin I would have probably popped in by now after all it was the same place I originally purchased my optocouplers from.
Unfortunately their eBay outlet is rather overpriced - delivery chargers at £2.99 + £1.39 = £4.48 for an optocoupler is frankly obscene - http://www.ebay.co.uk/itm/LOW-CURRENT-T ... 0752585654

Richard S.

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rpdom
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Re: Optocouplers and Opto-isolators??

Sat Mar 09, 2013 7:38 am

Hmm, I could probably pop into the local Maplin (about 40 minute walk), buy the 2 they have in stock (allegedly) and post them to you for less than they charge on ebay. Those delivery charges are stupidly high :(

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