Re: Noise issue with DIY variable PSU and audio amplifier
I hope that the circuit works as expected for you. Do check how much head room you need for the 7809 to work correctly. If I remember correctly the low drop out varieties don't need as much head room as the bog standard types.
I've not checked the data sheet for the UPC1212C to see how much current it draws, possibly 250mA or less but once you know the normal operational current you can work out the dropper resistor value using ohms law.
Dave
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