Your diode needs to be larger than the total current the combination will draw at peak. The cap could be for power supply filtering or emi or ? Not really sure.
You could use just a 2.7 volt zener diode (reverse biased) inserted in series with the Arduino to knock off 2.7 volts off of the 6 volts. From: Jason McKemie Sent: Wednesday, November 1, 2017 10:27 AM To: [email protected] Subject: [AFMUG] OT: Electronics Question I'm rigging up an Arduino controlled blind setup and trying to configure the power supply. The installation will have an Arduino (3.3v) and a servo that will operate at around 6v. I was going to supply the whole thing with 6v and use a step-down converter on the Arduino. Someone recommended using a diode on the + input, and a cap across the inputs to the step down - how would I go about sizing these appropriately?
