Quote Originally Posted by volkov
The unit is powered from a 30v AC power pack and the circuit will draw something in the order of 10mA when relay is off and less than 25mA when energised.
Hi,

Also possible when the rectified voltage is above 35V which is the maximum input voltage for a 7805:

3-Terminal Adjustable Voltage Regulator
http://www.national.com/pf/LM/LM317HV.html

The maximum input voltage of a LM317HVT is 60 volt.

Best regards,

Luciano