Pup Capacitor - Alesis HR-16 Service Manual

7.20 PUP Capacitor

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Revision CA
When the PUP circuit first appeared, it was found that the circuit would occasionally oscillate
on power up, causing noise. This was eliminated by adding a bypass capacitor (later incorporated
as C62) across the power supply pins of U20 (pins 4 and 11).
HR-16/HR16B Service Manual 1.00 14