I have a project involving step motors, a solenoid, and a relay module. These components will be controlled by an Arduino.
Motor 1: 6.8V 1.7A
Motor 2: 2.0V 1.2A
Solenoid: 5.0V ???A
Relay Module: 5.0V 0.16A
As you can see, it’s a mishmash of voltage and amp requirements. I was planning on using separate transformers to power these components, but I am hoping it may be possible to use a single transformer and reduce the voltage with voltage regulators.
Note: The Arduino itself will be powered via USB.
Note: The drivers for the stepper motors will always be powered. The solenoid and relay module will require power intermittently. To be safe, it seems that a minimum of 4A must be provided by the power supply.
If one used a single DC power supply with 4A output current, how simple would it be to create a circuit to deliver 6.8V, 2.0V, and 5.0V? I have drawn the attached (overly simplified) schematic as a starting point.
Specifically what capacitors would be recommended?
Are any other components necessary?
Using this set-up, how stable would the Vout current be?
What level of efficiency could I expect from this set-up?
I found some highly efficient voltage regulators from the V78 Series. Would using these regulators provide any further benefits beyond energy efficiency?