The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone i...

Strip LEDs are available in different colours powered by direct current (DC) source. These LEDs are available as surface mount devices with...

The Maxim MAX 6665 (www.maxim-ic.com) provides a complete temperature-dependent fan controller. It can switch fans operating at voltage...

This is a unique flasher circuit employing a single driver transistor that takes its flash-rate from a flashing LED. The flasher within the ...

A partial solution to quietening noisy PCs can be to reduce the speed of internal cooling fans. Low-cost fan speed controllers are avai...