On 02/01/2020 20:02, Martin Gregorie wrote:
> On Thu, 02 Jan 2020 17:39:41 +0000, The Natural Philosopher wrote:
>> On 02/01/2020 16:57, Toby Newman wrote:

>>> Cool, so do I have this right:
>>> Connect the 19V across the inputs, then a large resistor across the
>>> outputs, and use a multimeter to watch the voltage drop across the
>>> large resistor while twisting the potentiometer with a screwdriver
>>> until it matches 5V, then replace the resistor with the Raspberry Pi?

I find there is no need for the resistor.

>> read what he said.
>> "this (highish) voltage is fed in to a buck dc-dc converter eg.
>> https://tinyurl.com/vbbbv8f  This delivers a good steady supply of
>> 5volts to the pi Zero W, camera and LEDs."
>
> Or pick up one of the solid state DC-DC converters from eBay up to 22v
> input, 5v and up to 3A out, e.g. https://www.ebay.co.uk/c/24003654862
> You can get them with bare wires or pay a quid or two more to get one
> with prefitted USB output sockets.
>
There are probably as many solutions as there are people in this group.
Personally I went for the variable ones because:
1 they're cheaper and
2 I sometimes want to power other stuff e.g. 3.3, 6 and 9 volt stuff.

Happy new year every one and may all your projects work as well as you
would wish.

--
Nev
It causes me a great deal of regret and remorse
that so many people are unable to understand what I write.

--- SoupGate-Win32 v1.05