> The other thing have you considered using a small low current
> switch and building a small soft switching circuit? They are
> usually quite cheap

Yes, I have thought about semis. Part of the original enquiry was
whether the relays in the circuit could be replaced with FETs. I
couldn't see a good reason to do that. And now my thoughts are
turning to whether this switch could be replaced by either a
momentary relay (two NO relays ?) or an equivalent H-bridge
controlled by the SPDT momentary switch I know I can get

I'll keep that as Plan B. The best solution will be getting a DPDT
momentary switch with the higher rating

Joe


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