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Low-Cost Buffered Voltage Reference Circuit |
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Figure 1.
Low-Cost 5-V Reference Circuit Diagram
This is a
low-cost voltage reference circuit. Its main component is a
general-purpose operational amplifier, the 741, configured to output a buffered fixed reference voltage for use
by other IC's or circuits, such as an Analog-to-Digital Converter (ADC).
The reference
circuit above is designed to output 5 volts, and employs an AD589 as the
741's own reference. The AD589 is a low-cost,
temperature-compensated bandgap voltage reference that provides a
constant output of 1.23 V. Thus, the voltage at both inputs of the
741 is 1.23 V, which is also the voltage at the junction of the 1K and
3K resistors connected to the inverting input. This forces the 741 to
output a steady voltage of approximately 5V (1.23V x 4K/1K = 4.92V).
See
also: Operational Amplifier
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