2017-07-29, 22:52
The only Raspberry Pi project I have that got me searching for a PSU that could supply a real 4 A is the media player. The Pi doesn't use it, it's spinning up the 2 T byte USB HDD.
Wandered about the house the other day placing the antenna of a SW receiver close to anything I thought might be radiating RF noise. Found three big offenders, two LED light bulbs and the electronic ballast for the aquarium lights. One of the light bulbs is Luminous brand from CostCo (UK), the other an unknown "brand" from the local hardware store. We have a mix of light bulbs in use, from tungstenm CFL, LED chip to LED filament. RF wise tungsten is silent, CFL noisy, LED chip significantly noisier, LED filament, quieter than CFL but not silent.
The many wall wart SMPSUs were on a par with CFLs, maybe a bit quieter. I know that some of them have noisy outputs from setting up my station. At some point I intend to invest in a multiple output CCTV power supply, these are a single box conatins a 12 V 10 A (or more) PSU and distribution for individually fused outputs. Need to check what everything actually lives off, if something wants a lower voltage I have some LM2956 based DC-DC convertors that I hope don't radiate too much.
Aquarium? Need to investigate that, it's double insulated so has no ground connection for starters.
Wandered about the house the other day placing the antenna of a SW receiver close to anything I thought might be radiating RF noise. Found three big offenders, two LED light bulbs and the electronic ballast for the aquarium lights. One of the light bulbs is Luminous brand from CostCo (UK), the other an unknown "brand" from the local hardware store. We have a mix of light bulbs in use, from tungstenm CFL, LED chip to LED filament. RF wise tungsten is silent, CFL noisy, LED chip significantly noisier, LED filament, quieter than CFL but not silent.
The many wall wart SMPSUs were on a par with CFLs, maybe a bit quieter. I know that some of them have noisy outputs from setting up my station. At some point I intend to invest in a multiple output CCTV power supply, these are a single box conatins a 12 V 10 A (or more) PSU and distribution for individually fused outputs. Need to check what everything actually lives off, if something wants a lower voltage I have some LM2956 based DC-DC convertors that I hope don't radiate too much.
Aquarium? Need to investigate that, it's double insulated so has no ground connection for starters.