# Pcb layout

#### Berzin

Joined Dec 17, 2020
19
Hi guys
Actually I am little new to the great world of pcb and I am working on a new project of my own so i have fews questions regarding it so please help me out if possible
I am making a machine which is been solely be working on pcb/ motherboard. So my first question is the pcb has atleast 6 to 7 main process ICs to function their individual process so how calculate the power requirements for the whole pcb as all processes are 12 volt each so the answer will be 12 volts or 72 volts
And secondly the main question that I am trying to trail my circuit design on the breadboard with 18volt and the circuit requires 12volts but the circuit is not working please any one explain me why is this happening and solutions for it

#### ericgibbs

Joined Jan 29, 2010
11,551
hi Berzin,
Welcome to AAC.
Do you have a circuit diagram of your circuit that you could post.?
E

#### jpanhalt

Joined Jan 18, 2008
10,913
Why do you thing the supply needs to tbe 72 volts when you have 6, 12-volt IC's?

Generally, one establishes a "12V Rail" and attaches the IC's in parallel to that rail, not in series.

#### Berzin

Joined Dec 17, 2020
19
hi Berzin,
Welcome to AAC.
Do you have a circuit diagram of your circuit that you could post.?
E
Thank you so much for your support
Please find the attachment sorry it's a rough and secondly I will separate the ground and positive on the pcb by using double layer pcb
All the ics are using 12 volts each please help me out

Mod: lightened your image.E

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#### Berzin

Joined Dec 17, 2020
19
hi Berzin,
Welcome to AAC.
Do you have a circuit diagram of your circuit that you could post.?
E
Thank you so much for your support
Please find the attachment sorry it's a rough and secondly I will separate the ground and positive on the pcb by using double layer pcb
All the ics are using 12 volts each please help me out

#### Berzin

Joined Dec 17, 2020
19
hi Berzin,
Welcome to AAC.
Do you have a circuit diagram of your circuit that you could post.?
E
Thank you so much for your support
Please find the attachment sorry it's a rough and secondly I will separate the ground and positive on the pcb by using double layer pcb
All the ics are using 12 volts each please help me out

#### jpanhalt

Joined Jan 18, 2008
10,913
Your IC's appear to be in parallel. All you need is 12V, if that is what you want them to run at.

#### Berzin

Joined Dec 17, 2020
19
Your IC's appear to be in parallel. All you need is 12V, if that is what you want them to run at.
Thank you for your reply but then why it is not working on the 9 volt + 9 volt battery or it requires only 12 volts

#### jpanhalt

Joined Jan 18, 2008
10,913
All of the ICs/arrays should work at 9V. That means there is something wrong with your design or the way it is assembled.

Your design has several essentially identical "cells." Make one cell and see if it works. Get it to work, then duplicate as needed.