[time-nuts] TBOLT communication

[Lux, James P]

> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Predrag Dukic
> Sent: Wednesday, September 24, 2008 1:23 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] TBOLT communication
>
>
>
>
> Lux,
>
> my hardware experiences confirm that +-6V is marginal. Some
> devices work, some do not.
> The problem is a charge pump chip inside the converter and
> not the Prolific interface  chip itself.
> (It generates  ttl levels anyway).
>
> All converters I saw till now are two chip solutions (usb
> chip and level translator with internal charge pump to
> produce +- supply.
>
> Predrag
>
>

And they are a very cost sensitive product, so they're not going to put any bigger capacitor on the charge pump than absolutely necessary.

Jim