My Light Diagram

This circuit provides secrecy when two or more telephones are connected in parallel to a telephone line. The circuit also prevents incoming calls to as well as outgoing calls from other telephones connected in parallel, except from the one lifted first. When someone picks up the handset of the telephone connected in parallel to the original (master) phone for making an outgoing call, no dial tone is heard and the phone appears to be dead. But when a call comes, the ring signal switches the SCRs ‘on’ and conversation can be carried out. As soon as the handset is kept on the hook, the SCR goes off and the telephone can again only receive incoming calls. Parallel Telephone with Secrecy and Call Prevention Circuit Diagram When a call comes, conversation can be made only from the telephone which is lifted up first. To carry out conversation from the other telephone, the handset of the telephone that was lifted up first has to be placed on the hook and then the push-to-on switch of the assoc...

Necessity of Parallel operation of D.C Generators It is usual to install several generators for smaller rating I a power station rather than one large unit capable of dealing with maximum demand. The major advantages of many units operating in parallel are: 1.        Service continuity: By having many units in the power station service continuity can be maintained, which is most essential for any power system, in case of breakdown of a particular unit, the rest of the units can meet the demand. 2.        Efficient working: The load on a power station generally fluctuates, being maximum during the evening hours and minimum during the night hours. A particular generator is most efficient when it is delivering power at or near its rated capacity. Thus are the time of light loads, only small units should be in operation. When the load on the station increases, more units can be operated in parallel with the earlier one. 3.  ...

How to Connect two or more transistors in parallel While making power electronic circuits, configuring the power output stage correctly becomes very crucial. These stages primarily may consist of power devices like the power transistors or MOSFETs. Using power transistors are more common due to the greater ease of  configuring them. However when higher outputs are desired, it becomes necessary to add more number of these devices together. And as per the rules, it becomes necessary to connect them in parallel. Though using transistors in electronic circuits is pretty easy, connecting them in parallel needs some attention due to the one significant drawback with transistor characteristics. As per transistor specs, the devices needs to be operated under reasonably cooler conditions and that's why we install heatsinks on them to maintain the above criterion. Moreover, transistors have the "bad habit" of conducting proportionately rising currents through them as they get heate...