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Old 29th October 2005, 08:16 AM   #1
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Default PCB Design problem.. Pls advice

Here guys,

this isnt the first pcb i m designing.. but certainly quiet complicated.

actually the circuit generates frequency upto 50khz reqd for my purpose. though i know some of the kiddy basics about designing the pcb's, i would want to know about the tracks spacing and the ground plane width preferably.

Apart from this, i have general doubt since long.. In my PCB, does steep turn of tracks (90deg or slightly less) is desirable or a curvish routes (tangentials) more preferred.. specially when its dealing with medim of high frequency signals such as mine..!

Also, i use a Xtal generating 6MHz tone with 4060 IC. However, i need to use only 2 freq division o/ps from 4060.. Can i leave these remaining pins open .. or should i connect them to ground through a dummy high resistance load.

Pls advice..
Regards Prasanna
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Old 29th October 2005, 10:52 AM   #2
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All CMOS input pins must be tied to ground or the supply voltage if not otherwise is said in the datasheet.

How are going to make the pcb, singlesided, doublesided, homebrewed or profesionally made?

Can you draw up a schematic and post it?
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Old 29th October 2005, 01:24 PM   #3
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Leave the unused output pins open.

Check the data sheet for supply voltage vs frequency performance.
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Old 29th October 2005, 04:23 PM   #4
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Quote:
Originally posted by peranders

How are going to make the pcb, singlesided, doublesided, homebrewed or profesionally made?

Can you draw up a schematic and post it?
thnx a lot sir..,

I m making the board single sided.. its the ckt. of a stereo multiplxer. The biggest problem was, it used +12 GND and -12V.. I strictly need it operate on only 2 i/p supply pins .. that too max at 0-15V. Fortunately, that was possible and the problem is solved..

Still, i have one main pining by brain.. how do i place the traces.. With simple turns as they are reqd, or with forcibly curved tangetials..?? Pls advice..

Regds Prasanna.
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Old 29th October 2005, 04:51 PM   #5
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Keep it compact, avoid long traces and loops.

Strive to get good ground and supply voltage.
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Old 29th October 2005, 05:19 PM   #6
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hi

hope the above link helps.it has a file going by the name of pcb design tutorial.

download the file.it has vital tips to help design a pcb.maybe the info in it might fulfil your purpose too
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