I found the CarPiHAT, but I don't think it'll work?
I want to build a Car computer, throwing my Joying out the window, but there are quite a few loose ends;)
Any pointers as to what I can use to power it?
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14 comments
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HiFiBerry team This won't work. While the Beocreate can be powered directly by the 12-14V from a car, you need to implement additional protection. Car power often has spikes that are higher than even the 24V the Beocreate is specified for. These need to be filtered, otherwise the Beocreate and/or the Pi can be damaged.
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Jason Hunter You saying it won't work, cause that CarPiHAT won't fit on the Pi with Beocreate 4CA already on top?
If that's the case, are there some products like CarPiHAT that I can use that you know of?)
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HiFiBerry team It won't fit because it won't fit physically, but also a 5V power supply can't be used at all as the Beocreate requires 12-24V.
I'm not sure what you want to use this product for.
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Jason Hunter ;), I intend to power the car speakers with it.
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HiFiBerry team You only need some protection circuit. However, I can't recommend a specific device. Usually electronics to be used in cars get designed in a way to deal with this kind of stuff.
Something like this MIGHT work, however, we haven't tested anything like this. https://www.amazon.com/-/de/dp/B08BRN3R5Y -
Jason Hunter In the manual, it says it has a maximum output power per channel of 70W for 4 ohm speakers, if the voltage is 24V.
The four speakers in my car are 25W and 4Ω, but the mains in the car is 12V, so that means I can only push 19W per channel?
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HiFiBerry team Yes, but if your speakers are rates at 25W, even 19W is probably more than enough.
The power rating of a speaker is the maximum power a speaker can accept without being damaged. It doesn't say that it will sound good at this power. The sweet spot is usually way below the maximum rating. -
Jason Hunter ok, but I got four speakers in the car, which are all four ohms. If I wire two parallel, then the resulting impedance becomes two ohms. Is this not a problem if the Beocreate expects four ohms?
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HiFiBerry team Beocreate has 4 outputs, no need to wire something in parallel.
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Jason Hunter ok, I said wrong. I have six speakers, all at four ohms. I forgot the two tweeters.
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HiFiBerry team If you have existing passive crossovers, you can connect tweeter and bass on the same output.
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Jason Hunter I don't, but I was thinking of wiring the four mid-range drivers on first channel, then use the remaining channel for the tweeter.
That would put a daisy chain in parallel of two mid-range on a single channel, yielding two ohms. That's ok?
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Jason Hunter That looks doable?;)
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HiFiBerry team Connection two in series will work.
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