Erica Synths EDU DIY Mixer Eurorack Module Kit - Manual (Page 36)

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their job is to simply compensate for any unwanted noise in the supply rails. If the input
voltage drops, then these capacitors will be able to bridge the gap to keep the voltage at
the IC stable. And vice-versa - if the voltage increases, then they’ll be able to absorb the
excess energy trying to flow through to the IC, which again keeps the voltage stable.
Typically, 0.1 uF capacitors are used for this purpose.