[E3-hacking] Universal E2/E3 serial interface design

[Jasmine Strong]

On 21 Jan 2006, at 16:02, Ian Stirling wrote:
>
> The 1K resistors are not quite adequate protection on the input of  
> IC1A.

I agree, and I would use 4k7 resistors here.

> Four diodes, one each between the tip/ring connections, and VCC/ 
> ground would be a good idea.
> 1N4148 or similar would be fine.

Or a chip diode pack.

And "SLEAVE" should be "SLEEVE".

-J.