Palm Pilots are just one of the devices that use the IrDA standard for infrared data communication. Most Desktop PCs are not equipped with an IrDA interface so this simple circuit convenient... Read more
If you’re short of inputs on your amplifier, but it has an input for a magnetic pickup with RIAA correction, this very simple project will et you convert this into a high-level linear input,... Read more
The LM1830 fluid detector IC from National Semiconductor is designed to be able to detect the presence of fluids using a probe. This chip requires a relatively high supply voltage and is not... Read more
The digital volume control published in Elektor Electronics October 1997 can be used either with an RC5 remote control or with two pushbuttons (louder/softer). If for whatever reason you can... Read more
This circuit represents an interface converter between the UART pins of a microcontroller (with TTL levels) and a ‘standardised’ RS232 port with symmetric ±15- V levels. In contrast to the c... Read more
More and more communications systems are operating in the 2.4-GHz ISM (Industrial, Scientific, and Medical) band, including Bluetooth, various WLAN (Wireless Local Area Network) and Home-RF... Read more
If analogue signals have to be switched, a bilateral switch such as the 4066 is often utilized. Because this IC can be powered from single-ended supply only, all the associated components ar... Read more
This converter may help if just the serial port on a personal computer is free, whereas the printer needs a parallel (Centronics) port. It converts a serial 2400 baud signal into a parallel... Read more
This little circuit is intended to be used to provide external access to an unused digital output of a CD or DVD drive in a PC. It provides an electrically isolated interface. In addition, t... Read more
Anyone who has to reduce the amplitudes of RF signals in a controlled manner needs an attenuator. Linearly adjustable attenuation networks using special PIN diodes are available for this, bu... Read more
