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