[sdiy] MCT2 Optocoupler questions

john slee indigoid at oldcorollas.org
Tue Jan 20 05:38:44 CET 2015


You might look at AndrewF's DP filter!

http://nonlinearcircuits.blogspot.com.au/2014/01/double-penetration-filter.html

I have one of these at the top of my PCB backlog pile. Just need to
order the SMD bits

John

On 20 January 2015 at 10:47, Andy Eakin <aeakin1 at matrixblues.com> wrote:
> I posted this over at Muff's but with the recent board issues, visibility is
> a bit low.
>
> Long story short, I am in possession of about 80 of these little buggers.
> While I have not worked with optocouplers before, I have always understood
> them as an on/off switch for isolating (thinking MIDI interface or high
> voltage switching).  Looking through the datasheet
>
> http://www.ti.com/lit/ds/symlink/mct2.pdf
>
> I found some things that have arouse my curiosity:
>
> "Base Lead Provided for Conventional Transistor Biasing"
> and
> Page 4 Figure 2 "COLLECTOR CURRENT vs INPUT-DIODE FORWARD CURRENT"
>
>
> This leads me to believe that I could drop one in place of any similar NPN
> BJT and use the LED as a current controlled fun bit.  Is my thinking right?
>
> I would love to experiment but my bench is still packed in boxes from a
> recent move.
>
> Andy
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