1-Wire Hub Version 3

A year and viagra purchase without perscription us pharmacy a half on and it's finally time for another run of 1-wire hub boards. After a year and a half of using OrCad I noticed that the old board design could do with a clean up, so I've re-done the entire layout and added some extra features.

I've added BAT54S's on each 1-wire data line to stop it from going above +5v or below 0v, pads for a transient voltage suppressor on cheap authentic viagra each 1-wire data line to help protect against line transients such as lightning, although some people have reported problems when using TVS's with 1-wire, I'm using a P6KE7.5A from Fairchild Semi and I haven't had problems yet, you don't have to use a TVS you could use a GDT or an MOV or just an ordinary Zener diode.

 

I've also added reverse polarity / reverse EMF protection to the +5v power lines as well as a TVS for overvoltage / transient protection. The power connector has been upgraded from a 1.3mm to the more common 2.1mm power connection, two parts, the DS2401 CSP and the best time to take viagra 33uF capacitor straight after the power connection have been removed as I felt these weren't necessary. The re-routing of the PCB has also produced a much better track layout, that I was happy with, apart from that everything else is still the same.

Circuit Schematic
 
PCB Layout
 
Component Layout
 
Version 3 Finished Hub
 
Jumper Settings

Power Settings:

J1 Connect Unregulated +V to Pin 6 of all RJ45 sockets
J2 Connect Unregulated +V to Pin 3 of all RJ45 sockets
J3 Connect Regulated +5v to Pin 1 of JP1-JP7 headers
J4 Connect Regulated +5v to Pin 1&2 of all RJ45 sockets

Additional Device Headers (JP1-7)

Pin 1 = Regulated +5v (controlled by J3)
Pin 2 = 1-Wire DATA
Pin 3 = GND

JP1 Input connection (bus)
JP2 Main 1-Wire output of kamagra rx U2 (port A)
JP3 Aux 1-Wire output of U2 (port A)
JP4 Main 1-Wire output of U3 (port B)
JP5 Aux 1-Wire output of U3 (port B)
JP6 Main 1-Wire output of U4 (port C)
JP7 Aux 1-Wire output of U4 (port C)

Component Details
Case Construction Details