DC Buck Converter Single to Dual Positive Negative Output  5V 12V  Metal Case Op-Amp Power Audio Circuit.
 
A buck converter drops a higher voltage to a lower one. A single-to-dual converter splits that single lower output into both a positive (+) and negative (-) voltage. This creates the split power supply required by operational amplifiers ("op-amps") and audio equipment. A metal case blocks electromagnetic interference (EMI) so your audio sounds clean.
 
How to Use it for Op-Amps:
Input: Connect your single DC power source (e.g., 12V or 24V) to the input terminals.
Outputs: The board provides three wires or pins: Positive (+V), Ground (GND), and Negative (-V).
Voltage Goal: Op-amps usually need equal positive and negative voltages (e.g., +15V and -15V).
Connection: Connect +V to the op-amp's positive pin, -V to its negative pin, and the source ground to your circuit ground.