On Jun 15, 11:49*am, Bennett wrote:

You could use a Uninterruptible Power Supply (UPS). *You'd need the kind
that is always regulating the output voltage (an online UPS), rather
than just turning on when power is lost or sagging badly (a standby UPS).

Would a UPS that outputs voltage exact to within 1% or so be very
expensive?
Also, can one get a UPS with adjustable output voltage?
Laura