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Article
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LM317, understanding and listening - July 2007
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Last revision on July 2007
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LM317, understanding and listening
Noise figure on LM317 output. See article for details.
Figure 1
Cadj = 10µF tantalum, Cout = 1µF MKT.
2mV/div.
Only see noise from measurement method. Real noise is certainly less. No subjective noise, even putting ear
near speaker.
Figure 2
Cadj = 10µF tantalum, no Cout.
2mV/div.
Figure 3
No Cadj, Cout = 1µF MKT.
2mV/div.
Noisy (shuffle) at listening place.
Figure 4
No Cadj, no Cout.
2mV/div
Subjectively noisier than figure 3. (16mV pp noise).
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