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Tab Electronics Guide to Understanding Electricity ... - Sciences Club

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Integrated Circuits<br />

341<br />

connected directly <strong>to</strong> “rail” power supplies of typical audio power amplifiers.<br />

For rail voltages higher or lower than 38 volts, the value of the<br />

series dropping resis<strong>to</strong>rs would have <strong>to</strong> be changed accordingly. Naturally,<br />

if you wanted <strong>to</strong> provide operational power <strong>to</strong> this circuit with typical<br />

dual-polarity 12- or 15-volt supplies, you would simply omit the two<br />

zener diodes and their associated components (i.e., the 1.5-Kohm dropping<br />

resis<strong>to</strong>rs and 220-F filter capaci<strong>to</strong>rs).<br />

LM1458 or NTE778A operational amplifiers are specified for this circuit,<br />

but almost any general-purpose op amp will provide satisfac<strong>to</strong>ry<br />

results. If you want <strong>to</strong> significantly improve performance for a highquality<br />

application, you could use TL-074, OP-176, or AD797 operational<br />

amplifiers. In addition <strong>to</strong> utilizing high-performance operational amplifiers,<br />

the signal-<strong>to</strong>-noise ratio (SNR) can be improved by using 1% metal<br />

film resis<strong>to</strong>rs instead of the more common carbon film or carbon composition<br />

types of resis<strong>to</strong>rs.

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