Il 5534 e' la versione singola-larga_banda-non_compensata del 5532.
E' stabile per guadagni >=3; per guadagno unitario deve essere compensato con una capacita' da 22 pF (vedi datasheet)
https://www.onsemi.com/pub/Collateral/NE5534-D.PDF
Qui sotto la loro opinioni - divergenti - sulla stabilita' del 5534. Il circuito cui Cordell si riferisce e' un equalizzatore RIAA, parte di un preamplificatore, pubblicato su Elektor.
Come vedete - a fronte delle perplessita' di Cordell sulla stabilita' del 5534 - Self afferma - contro i dati del costruttore - che il 5534 e' poco critico nei confronti delle potenziali oscillazioni e supporta la sua convinzione con l'esperienza di una "high-volume production".
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Bob Cordell
If I'm not mistaken, the 5534 used in your design for the RIAA equalizer is in a non-inverting unity-gain configuration at high frequencies, yet you appear to be using a 4.7pF compensation capacitor when the spec sheets for the 5534 recommend a 22pF compensation capacitor for unity-gain non-inverting situations. Did I look at the schematic wrong or misunderstand something here? Can you comment on that?
https://www.diyaudio.com/forums/analog- ... ost3024740
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Doug Self
Well Bob. this is a classic divergence between theory and reality. The 22pF is presumably a belt-and-braces value that will give stability under all possible feedback conditions, supply voltages, tempertaures, etc etc.
However, a 5534 in my circuit with 4p7 is definitely stable- I've been using that value for 16 years and haven't seen or heard of any problems yet. In fact I have found that a 5534 is usually unity-gain stable with no external compensation at all, though I wouldn't want to depend on that in high-volume production.
https://www.diyaudio.com/forums/analog- ... ost3025955