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Advice on which linear regulator to get

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nrml:
My (limited) understanding is that, linear regulated power supplies provide a cleaner output than switching power supplies which is why I was considering a linear power supply. The module is fairly cheap (£12 including shipping) and I have a suitable transformer lying around, so costs are not prohibitive.

It is probably a bit of an overkill for a raspberry pi music player, but I didn't want to penny pinch and end up regretting it later, as the DAC I have has a very low noise floor and the equipment downstream is very transparent.

grg12:
9V trafo will, after rectification generate about 11V withot load - how much with load depends on particular trafo and capacity of smoothing capacitors.  You need 5V so 6 will be dropped on regulator chip (this applies to all linear regulators) you will draw 2A. So linear regulator will be heated with 2A*6V=12Watts. That's a loot , you will need quite a big radiator and some ventilation

nrml:
Thank you. That sort of practical information is exactly what I was hoping for.

Time for a re-think.

sparky961:
Why not use a 7805? No external components needed to set the voltage. I am surprised the board doesn't have anything built in though.

It has been mentioned but I'd use a switching supply too. Add some decoupling caps if you have detectable noise. All computers and many other critical applications use switching supplies without problems. I use old computer P/S's to power many a project. You even get a selection of useful voltages already there.

nrml:
Perhaps I am reading too much into reports of SD cards getting corrupted by poor power supplies. I thought it might be a cheap and easy thing to throw a ready built fleabay module onto a transformer I already had and avoid this potential problem and also reduce jitter in the output. I didn't take into account heat dissipation and the additional cost and complexity this brings in.

Given the low cost of the entire project, an OEM 12Watt USB apple wall wart might be the best value for money vs output quality compromise. They seem to measure reasonably well in independent tests. At £15, it costs very little more than my original plan. If the output is as good as a half decent CD player I will be happy.

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