In Figure 3 here

http://www.rory.co.nz/projects/lighting/beat_strobe.html

the author specifies an H11D1/H11D2 optocoupler, which has a
Vce of 300V, as described in "Opto-coupler Selection"

None of my usual suppliers have the H11D1 or 2, and AFAICT
none of their other opto-transistors have Vce greater than 70V. It
isn't possible to do a quick search because output voltage isn't one
of the parameters, only isolation voltage and output current. Only
by downloading all the datasheets

Is there a reason why a MOC3020 opto-triac couldn't be used ?

Or is there an alternative opto > 80V ?

How about a Darlington with a lower voltage opto (eg 4N25 or 4N33
which I have a few of) and an external high voltage transistor ? I think
I would need a voltage divider to knock down the voltage across the
opto's internal transistor. If so, how would this affect the drive for the
SCR gate through the external transistor ?

TIA

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