Re: [N8VEM-S100:3929] Re: Power distribution across an S100 Board and voltage issues with TO-3 Regulators..

[Todd Goodman <t...@bonedaddy.net>]

Hi John,

If you want thicker copper layers you specify them when placing an order
with PCBCart.

Todd

* John Monahan <mon...@vitasoft.org> [140603 12:42]:
> Yes the copper wire jumper did even up the voltage Neil. 
> 
> Andrew, do you know if PCBCart has the ability to lay down a ticker copper trace. If so, how/where do you define it
> 
>  
> 
> Lastly to everybody, is the consensus that TTL’s at up to 5.2 (say) volts is OK for long term operation. I’m not concerned with short term working.
> 
> John
> 
>  
> 
>  
> 
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of nbreeden
> Sent: Tuesday, June 3, 2014 6:46 AM
> To: n8vem...@googlegroups.com
> Subject: [N8VEM-S100:3926] Re: Power distribution across an S100 Board and voltage issues with TO-3 Regulators..
> 
>  
> 
> Try taking a larger gauge wire and jumpering VCC and VSS to the other side of the board (near where the v-drop is largest); if you see the voltage drop go away or decrease significantly the power distribution raids on the PCB may be too narrow (you end up with higher series resistance in the PCB traces); thinner copper will have higher resistance as well. If I'm remembering correctly sheet resistance rules apply to copper as well as thin films. http://en.wikipedia.org/wiki/Sheet_resistance
> 
>  
> 
> I'm also seeing TO220 NOS 7805s that are way out of spec; these tend to be generically marked (no brand name) and have been between 4.7 to 5.2 VDC for me.
> 
>  
> 
> -Neil
> 
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