We have neglected a fundamental topic in our blog posts. The power supply! Ideally, you have in your workshop, or several laboratory power supplies, which provides the required energy for our projects. If the project has left the prototype stage, we procure a properly dimensioned power supply exactly for our purpose. But as is so often the case, practice and theory are far apart and so we usually lack the right hardware for our project, which we naturally want to implement at the weekend due to time constraints, where short-term procurement is no longer possible. For this reason, I would like to present several ways of helping yourself in the short term.
Attention! Working with mains power is reserved for electricians as there is a serious injury or danger of death!
This is what we found in our craft drawer:
From left to right in the picture:
- Old plug-in power supply 9V
- cheap power bank
- TP4056 Charge Controller
- MT3608 Step-Up
- 3 self-designed PCBs for our mini power supplies
- Mini power supply 3.3, 5 And 12v
- LM2596S Step-Down
- Powerpack for Raspberry
- UK Power Supply for Raspberrys
- and at the top of the picture an old PC power supply
The old 9V 1A power supply is well suited to our MB102, or a UnoR3 directly. The 9V are a bit high, but the fixed voltage regulators AMS1117 can withstand this (pay attention to the maximum current!).
We once purchased the pictured power bank in a promotion at a name-based specialist market for 1€. This consistently performs 0.9A at 5V without voltage loss:
Our mini power supplies are available in the versions 3.3, 5V and 12v, the most common stresses during crafting are thus covered. If necessary, we solder them onto small boards for better handling. In terms of price - performance, we have not yet been able to find a product for better supply for our customers.
Our Power Shield for the Raspberry delivers 5V for Arduino & Raspberry with a maximum discharge current of 1.8A. With the help of the LM2596Sthe voltage can be easily lowered to 3.3V to be able to operate ESPs directly with it.
The UK power supply, which we bought for 1€ on E-Bay, was quickly dismantled and glued into a suitable housing.
After soldering a cold device cable and then assembling a strain relief, we can use it unrestrictedly as a Raspberry power supply.
Last but not least, the ATX power supply, a real miracle weapon. The nameplate tells us a lot about the performance.
As we see, this power supply provides the voltages of 3.3/5/12V that we need and provides sufficient power for large projects such as the supply of several LED panels.
We will show you how to use your old ATX power supply ideally for your projects in one of our next blog posts. Until the next time ;)