Clipping & Clamping Circuit Apparatus Instrument Comprises of DC regulated power supply 0-3 V DC / 150 mA, Two fix output DC power supplies connected in series of diodes for positive & negative clipping, circuit diagram for clipping & clamping circuit is engraved on front panel components placed inside & connections brought out at 4mm sockets. Import duties, taxes and charges are not included in the item price or the shipping charges. These charges are the buyers responsibility. Please check with your local customs authority to determine these additional costs prior to bidding or buying. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up ? please do not confuse them for additional shipping charges. Sometimes packages may be stopped and inspected by Customs officials at the border of your country. In our experience these inspections are quick and easy, but in some cases it may cause a delay in your package arriving. Usually these delays will be shown in your tracking information. If customs decides that your package cannot enter your country, it will be returned to us. In this case, you will be issued a full refund minus shipping and return shipping costs when we receive package back.