This is a multi-part message in MIME format. ------=_NextPart_000_0013_01C9FE66.ABAE83B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit >> Is there a reason why a MOC3020 opto-triac couldn't be used ? I've come across the attached in an old folder. No idea where it came from though. Suspect it would be from one of those 'circuit collection' sites. Comments ? > Even a 300V opto would be marginal there. > > However, you should have no problem tapping down the high voltage > with a resistive divider. > Issues are that gate current can be quite high so that a divider that > is always on could dissipate excessive energy Other optos I've looked at besides the H11D1 do have 300V Vce but not its 100mA Ic. If the author is correct that 76V is the highest expected across the opto then perhaps the 4N38 (80V), which is covered by the same datasheet as the H11D1 Notwithstanding your comment about a 300V opto being marginal. If Vc is 70V, why would a 300V component be at risk ? > Adding an extra transistor or two to translate from opto circuit to > gate drive would allow good drive with low average power dissipation. > I can supply an ?MPSA43? which would work there if you want one. > (MPSA42 is common. MPSA4* is it's little seen cousin with an > extra 100 volts rating. (* = whatever it is I've got - I think it's MPSA43) You're suggesting an MPSA in a Darlington arrangement with the opto ? ------=_NextPart_000_0013_01C9FE66.ABAE83B0 Content-Type: image/gif; name="trigger.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="trigger.gif" R0lGODdhYQJRAYAAAAQCBPz+/CwAAAAAYQJRAQAC/oyPqcvtD6OctNqLs968+w+G4kiW5omm6sq2 7gvH8kzX9o3n+s73/g8MCofEovGITCqXzKbzCY1Kp9Sq9YrNarfcrvcLDm8BCDLZcBar1+y2G5JO B8wH+fuOz+un8TJ6vhcoOEj401f3Z1e4yNjo+AEQKTkZmfh4iZmp2XD4B6i4GSo6itcJ6Emaqrr6 ZWrKChsrGyX3OnuLm6u7y9vr+wscLDxMXGx8jJysvMzc7PwMHS09TV3tO2mdrU1ou+39DUUpPk5e Lg6Ont4kearu/l7FDo9uHleJdj/Hfo49vwLqT5srRKjo1FHULaAIgAqrDSyYwA5Cgg1LMKwo7WE7 /okRFSTE2OEiyGf25EHcp28cvnwjQ4hsyaxTLYoG8XlEBRNSzmsmKcj0c7LMxHY7Qxbd9dGBxp+1 hhI9muEl1CJSV9a7ipXfhYcm+9XbOHVD1bBBqrJMcW8sWSNq1/aQ2hbSWbdP4tLN8dLuXUF699YQ 2devnsCCY1ycWxgT4cQuDjMWtfjxP06RJaupbPkEQ8yZwXDuPGIzaMWj33Iq/egzag+iVzNS7Vrs 6diFYNPG4Pg2X91/lfIOZPv3BMDC8wQvDucBYuRhjjOfrdT5cyHSp3eEU926ae0qxi7nbiU7d+/9 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