Set Up Dual Line Bench Power Supply For Op Amp Testing

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SUMMARY

The discussion focuses on setting up a dual line bench power supply for testing operational amplifiers (op-amps) at +/- 15V using a 30V bench power supply. The key solution involves utilizing a virtual ground created by the op-amp's output when powered by a single rail +30V supply. This method allows the circuit to reference between +15V and -15V effectively, enabling proper op-amp functionality without needing a dual rail power supply.

PREREQUISITES
  • Understanding of op-amp functionality and requirements
  • Knowledge of power supply configurations
  • Familiarity with virtual ground concepts
  • Basic circuit design principles
NEXT STEPS
  • Research how to create a virtual ground in op-amp circuits
  • Learn about different power supply configurations for op-amps
  • Explore the specifications and applications of common op-amps
  • Investigate the impact of power supply noise on op-amp performance
USEFUL FOR

Electronics engineers, hobbyists working with op-amps, and anyone involved in circuit design and testing requiring dual power supply configurations.

MathsDude69
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This is a very silly question. I can't believe I have forgotten. I have a 30v bench power supply and I am looking to test an op-amp running at +/- 15v. I have a supply which has a negative output/ positive output and inbetween a green common/earth output. How do I wire them to produce the +/- 15v rather than just the full 30v?
 
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From your description, you just have single rail +30V power supply. But there is a simple way to power op-amps from a single rail by generating a virtual ground. Consider the circuit:

VirtualGround.gif


Apply +30V Vcc DC power, and the output of the op-amp will serve as a virtual ground to be used for the rest of your circuit which is now going to be referenced between +15/-15 volts.
 
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