Electronic Fuse for DC Short Circuit Protection by BRX46

This is an electronic fuse that protects the load against short circuit. Relays must be chosen with a voltage value equals to the input voltage.

Symmetric Power Supply for Op-Amp Applications by 78xx and 79xx

This is a symmetric power supply that  can be used with the applications which includes operational amplifiers. You should be careful during using this power supply since it has no short circuit protection. On the other hand you can connect appropriate diodes to protect the circuit.