Power Supply decoupling

 I am building a 'standalone' 2 channel energy monitor but am a bit stuck with the power supply decoupling.

I am using a LM8705 5v regulator, and whose spec sheet shows 0.33uF on the LM8705 input and 0.1uF on the output, which seem very small capacitance, especially when I see 2 x 47uF caps on my Uno board (I presume that they are used in connection with the power supply).

Any advice please.

Guest's picture

Re: Power Supply decoupling

What problems are you seeing - and what input is being used to provide your regulator input?

The more variable the input to the regulator, the larger the capacitor at that end you will need



Guest's picture

Re: Power Supply decoupling

No problems yet Ben because I'm still building it, but want to make sure that I get the values right at design stage.
The input is a 12v transformer supply fed via a rectifier bridge.

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