Question on PCB and routing

**irving2008** · 10-05-2013

Originally Posted by Fivetide

Hi MC , nah the last on the rail powers two 5v servos the first powers a raspberry pi , i'll have to rethink if it drains or spikes to much, but they are 7 quid a pop I would expect then to have some umthh ! lol
Beer 5 ..now poured !

Use this: The PCB Track Width Calculator to calculate track width...

Incidentally, 3-pin regulators should have 10 - 100nF ceramic capacitors on input and output else things can get noisy. See their datasheets.

**Fivetide** · 10-05-2013

Originally Posted by irving2008

Use this: The PCB Track Width Calculator to calculate track width...

Incidentally, 3-pin regulators should have 10 - 100nF ceramic capacitors on input and output else things can get noisy. See their datasheets.

Hi Irving hope your feeling ok , they are used for pure power no signal its just a drop down box.

**irving2008** · 11-05-2013

Originally Posted by Fivetide

Hi Irving hope your feeling ok , they are used for pure power no signal its just a drop down box.

read the datasheets... HF noise on power lines can cause all sorts of issues.. trust me, been designing electronics for 40 years!

**Fivetide** · 11-05-2013

Originally Posted by irving2008

read the datasheets... HF noise on power lines can cause all sorts of issues.. trust me, been designing electronics for 40 years!

So you think I should add 10k's at the voltage out ? I'm going off the guys schematic , he didnt include them only on the data line.

PI Tank power

**m_c** · 11-05-2013

I normally include an electrolytic cap on the output of linear regulators, then add a ceramic near the input of anything that may be affected by noise.

Although things may work without caps on the linear regs, it's not good practise. Lots of linear regulators specify minimum capacitence on the output lines in their datasheets.

**Fivetide** · 11-05-2013

Originally Posted by m_c

I normally include an electrolytic cap on the output of linear regulators, then add a ceramic near the input of anything that may be affected by noise.

Although things may work without caps on the linear regs, it's not good practise. Lots of linear regulators specify minimum capacitence on the output lines in their datasheets.

Hi MC , I'm more than happy to take your advice on this, what should I include and where .. Remember I'm a total Noob and I'm just following someone schematic. I have some CFR50 carbon film resistor,10K 0.5W will these do ?