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Return to BlogSymmetric Power Supply for Op-Amp Applications by 78xx and 79xx
Posted Jan 14, 2012 at 2:07 pm
Figure 1
This is a symmetric power supply that can be used with the applications which includes operational amplifiers. You should be carefull 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.
BR 1A Bridge Rectifier
Figure 2
Figure 3
Figure 4
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2 years ago: just to make sure, we can add a physical fuse or fuse circuit to provide short circuit protection on this project
2 years ago: very nice schematic and pcb layout. i wanna try this someday when I'm free. Thanks!
2 years ago: R1,R2 10K or 100K?