new here! And I know just enough to be dangerous!
I'm building a toy for my grandchildren that consists of LED lights, switches and knobs, small motors and sound circuits, etc. I used 3V as a spec when ordering components, so that the unit could run on two 1.5V batteries.
I want to add a power supply to minimize battery use. I have lots of power supplies laying around, 5V to 24V "wall warts." I could use one of those, and step it down somehow, or buy a 3V supply. But here's the rub:
As various switches and components are turned on and off (while using battery power supply), I notice LED lights brighten and dim. Something to do with voltage (or amps?) varying as the total load across the batteries changes, I presume.
What type of power supply should I use so that the voltage stays constant, regardless of how many LEDs or motors or sound boards are in use at any given time? One that would always supply 3V, whether the boys cranked on everything at once, or just a few components at a time...
Or is there a 5V to 3V step down circuit commercially available that would properly regulate the voltage (as I have a very nice 5V power supply that I could use, one that came with a now-discarded computer accessory).
Keep in mind (if possible) that I'm not looking to spend too much, as this "toy" is already considerably over budget! $10-$30 would be great.
Thanks! Mark G