[hpsdr] [OZY] Initial OZY Schematic Posted For Review and Comments - May 10, 2006

[Philip Covington]

On 5/10/06, Ahti Aintila <oh2rz.sdr at gmail.com> wrote:
> Phil,
>
> The small inductor L1 from P1/pin4 to ground is useful for limiting
> the ground loop currents, but C13 should be connected to P1/pin1
> (+5V). C14 is unnecessary. Data lines from P1/pin2, pin3 to DMINUS and
> DPLUS should have a small common mode choke and overvoltage clamps
> like SN75240PW. Keep the PCB trace capacitance of the data lines small
> and well balanced.

Any recommendation on a particular overvoltage clamp?  The SN75240PW's
input capacitance is too high for USB 2.0 according to the datasheet.

73 de Phil N8VB

 1147364788.0