As supplied (without a heatsink for the regulator IC) it is quite safe to draw 500mA continuously. This is a very conservative current rating as the circuit is capable of delivering 1 to 1.5A if the regulator IC is fitted with a suitable heatsink and properly cooled. You would also need to up rate the input transformer accordingly.
Kit requires an 18Vac/0.5A transformer for standard operation. Kit includes solder for assembly.Specifications
|Supply||18Vac/2A transformer (not supplied)|
|Output Voltage||18V dc fixed|
|Output Current||0.5 Amps max.|
|Board Connections||Solder Posts|
|Product Format||SELF-ASSEMBLY Electronic Kit (KT) Product Formats Info|