Scientech Technologies Pvt. Ltd. Offers SCR Alarm Circuit Board, ST2706. Scientech Technologies Pvt. Ltd. Is an ISO 9001:2000 certified company and is the manufacturer and supplier of test and measurement instruments. It is a compact and ready to use power electronics experiment board that helps the students to learn how to use SCR in alarm circuit. In this board, alarm and lamp are attached in parallel to work as load to the circuit. It also demonstrates the features of the SCR and this board can also be used as a voltage sensing device in an input alarm system. Following are the key features of this SCR Alarm Circuit Board: