Alternate Power DC-IN on the Euler Bus also with PI filter for batt operation

[MarkHaysHarris777]

   

In the pic above I am powering the PineA64 with a 12v batt (3000mah, SLA) using the 'CPT Car Power Technology' DC-DC converter;  it takes input of 7v - 50v (10 Watt) and has an output of 5v @ 2000ma. 

Again, I am feeding the 5v out from the DC-DC converter through the PI  low_pass  filter;  this is important when using most DC-DC converters, because they typically produce noisy outputs.  The PI filter will reduce the noise on the DC line input to the PineA64 producing a nice clean quiet stable power source!

Note: CPT comes with a micro usb connector output; I removed the connector-- I was pleased to find a good two wire cable under the sheath and I decided to feed the power to the euler bus +5v to pin(4) and the ground wire negative to pin(6). This makes the connection 'solid' and by-passes the weak micro usb connection. This is preferred for most robotics applications.

   

This is the solder side of the PI filter board. The important thing to note is that it is simplicity itself. Anybody can do this !

   

This is a close-in of the finished PI filter.  The point to note here is the male header pins. I always build small projects like this with header pins so that setup and tear-down is easy with jumper wires; also the same component can be swapped in when needed in other projects.

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Update: I added two close-in pics of the PI filter.

... again, this very much a beginner soldering project; just dive in and try it !