Electronic Fuse for DC Short Circuit Protection by BRX46

Description:

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. Don't omit using the 100uF capacitor with appropriate voltage value with respect to the input voltage. If you can't provide, you can use C106 instead of BRX46.

You can adjust the current with using 10K potentiometer. If you will use the fuse with very high currents, lower the 0R6 5W resistor value (ex. 0R47, 0R33, 0R22 or 0R1). Watt value of the resistor should be increased also. 

You can download ARES PCB layout file of the circuit from here .

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

Description:

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.

78xx and 79xx series regulators are used. xx denotes which voltage value is required at the output and xx value must be same for both ICs. J1,J2 and J3 are the transformer output connections. J2 must be connected to the middle output of the transformer...