I am working on halloween props and I am looking for a way to clean up the power supply.
A typical setup needs power for the following:
Arduino 5v
Audio module (runs off arduino)
powered speakers (3v, powered from usb)
Relays 12v
Solenoid valve 12v
So currently I have everything hooked up to seperate power supplies. obviously this is not the best way to do this.
I have been trying to find a sort of power distribution board or shield that I can just plug 1 power source into and it will regulate and/or distribute power to all of the devices i need.
It is not a good idea to mix 12V power circuitry with 5V computer circuitry, unless you understand power supply decoupling. Voltage spikes from solenoids and relays can destroy an Arduino.
Also, it is not a good idea to power the Arduino with 12V as this will stress the regulator.
You could have a power distribution board, powered by 12V, but includes separate step down regulators for the 5V and 3V devices.
I was hoping there was a board that had the step down reg etc built on. I was looking at some of the motor driver boards and they look to have a jumper to passthrough power to the arduino and 12v-24v output for motors.
Maybe I'm missing something but a simple, small 12V output transformer rectified, filtered and run through a 78L12 would run all the 12Volt stuff and then run one lead to the input of a 78L05 and run the Arduino and use a resistor to drop it for the other, or run another separate 78L033.
BenKeith:
Maybe I'm missing something but a simple, small 12V output transformer rectified, filtered and run through a 78L12 would run all the 12Volt stuff and then run one lead to the input of a 78L05 and run the Arduino and use a resistor to drop it for the other, or run another separate 78L033.
So just grab an appropriate wall wart power supply, wire to a board with leads going to the devices with a 78L12 in between the 12v devices, then a 78L05 in between the lead and the arduino and other devices?
Like picture
Sorry but I am new to this level of electronics. I can mostly follow diagrams and tutorials, but not proper schematics or know what should go where and why.
First, do a search on 78L05 and look at Texas Instruments (TI.COM) data sheet, it has schematics for how to wire them. There are a couple resistors/capacitors you need to use with them. The basic fixed output with filter capacitors on in and out is probably all you need. I would also get the metal tab case like a T0-220 case, they handle heat a little better and you can add a heat sink it they happen to get too hot.
I was thinking more along the lines of something like a 12v isolation transformer about 5 VA used with a bridge rectifier and capacitor. Most of those like you have in your pick are pretty small, less than one amp, and not knowing your total current requirements, it may not be enough. If they have one rated at 2 amps or so, you could try it.
Since you say you are new, let me add, be careful buying parts local, sometimes they get very proud of them, like $4 for a 30 cent part you can get elsewhere. I fully believe in supporting your local shops but there are times you might want to go on line when they get to overboard on prices. You can build the whole power supply I would use for probably less than $10 and that's with a small perf board to mount the stuff on.
BenKeith:
Maybe I'm missing something but a simple, small 12V output transformer rectified, filtered and run through a 78L12 would run all the 12Volt stuff and then run one lead to the input of a 78L05 and run the Arduino and use a resistor to drop it for the other, or run another separate 78L033.
These days power supplies are all switch-mode, they don't use 50/60Hz transformers. A 12V SM mains supply is
an off-the-shelf commodity.
The project mainly has inductive loads off 12V, I'd suggest keep that separate from 5V supply purely
for that reason, although there are plenty of budget buck converter boards on eBay to drop 12V to 5V.
