[sdiy] h11f1 optocoupler

[Michael Ruberto]

Ok, not the best ASCII schematic. this is the best way I've found for 
driving the H11's LED with a 0-12V CV. this circuit controls the LED by 
feeding it a 0-6MA current. this produces the most useful range of 
resistance in the FET. for an experiment connect a .01uf cap between pins 4 
and 6 then input an audio signal to pin 4 and monitor the output from pin 6. 
it's a 6db/Oct. Hi-Pass VCF.

                ______
                | 741 |
0-12V CV In >---|3+   |       ______
                |    6|-^^^^--|1   6|-- FET
              __|2-   |  560  |     |
              | |_____|       | H11 |
              |---------------|2   4|-- FET
              >               |_____|
              > 1.6K
              >
              |
              V

~M

>From: pfperry at melbpc.org.au
>To: sasami at hotkey.net.au (Ken Stone)
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] h11f1 optocoupler
>Date: Sat, 20 Apr 2002 23:40:36 +1000 (EST)
>
>sasami at hotkey.net.au (Ken Stone) wrote:
> > Has anyone tried out the h11f1 optocoupler? It appears to be a "vactrol"
> > built into a 6 pin dip - LED input photoresistive element output.
> > Unfortunately I think it is obsolete, but it looks to be a great devise.
>..very much in production, about $1.30 US from Digikey etc.
>The output is a symmetric fet.
>
>paul perry melb australia
>--
>Message sent by Webmail from melbpc.org.au




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