This article describe how USB device indicate its speed. You can find here solutions some vendors and circuits devices with pull up resistor.

USB is standards for connecting peripherals. This article you introduce into the theme.

DCF77 is a radio station that continuously broadcasts accurate time information, which you can receive and decode in your application.

Protection against electrostatic discharge is rapidly increasing in importance. This article provides an overview about what ESD is, where does it come from, and how can you protect your circuits from it.

If you want to use DTMF in your application, or just want to know a little more about the tones your phone makes, you should read this article.

Have you ever tried to design an xtal oscillator, and it would not work? This article lists several common problems with xtals that you are likely to run into.

As a preface, I would like to say that HW server does not indend at all to 'criticise at every cost'. We do our own development, too, and we do understand that it is not that easy to design and document something. However, we think it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time.

Very often, data needs to be transferred from a PC to another, either a notebook or a desktop model. Without a network, only the serial or parallel ports can be used for direct-connect data transfer. This article covers the often forgotten parallel port.

Great introduction to the industry standard for point-to-point and multipoint serial communication.

Great intro to the industry standard for infra-red communication. Includes hardware, components, protocols, links, etc.