[aprssig] has anyone built/modified a USB to TTL level converter??

[Tom Hayward]

On Thu, Jun 2, 2011 at 08:58, Bob <k8ys at fuse.net> wrote:
> I need TTL.
> I have RS232
> I have USB
> I do not have a RS232 port. Rules out the standard USB to RS232 dongle.
>
> I think that I want to take an old cell phone to computer interface that has
> a USB to RS232 level converter. It is a common chip, and I have the drivers.
>
> I want to take the RS232 from the cell phone cable and feed it to a MAX233
> to get TTL in/out.

Most (all?) of the USB serial converters are USB -> TTL UART -> level
converter. You'll be complicating things by adding another level
converter. Try cutting out the existing level converter, or just
starting over with a good USB->UART like this:
http://www.sparkfun.com/products/718

Tom KD7LXL