FREE
circuits!
Recently added diagrams and projects
September 30, 2010
A simple and convenient way to interface 2 relays for switching application in your project. This relay driver boosts the input impedance with a regular BC547 NPN transistor (or equivalent). Very common driver. It can... [more]
circuit from:http://www.extremecircuits.net/2010/01/dual-relay-driver-board-circuit.html
September 30, 2010
Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low-cost and easy to construct. The tester is built around infrared receiver module TSOP1738. Operation of the... [more]
circuit from:http://www.extremecircuits.net/2009/07/220vac-operated-remote-tester.html
September 30, 2010
This simple circuit tests speakers, microphones, transformers and voltage. It's basically a very low frequency oscillator that produces extremely short 'fruity' pulses. The type of sound produced is very easy to hear and to determine... [more]
circuit from:http://www.extremecircuits.net/2010/01/components-voltage-tester-circuit.html
September 30, 2010
Having good contacts is important – not only in your daily life, but also in electronics. In contrast to social contacts, the reliability of electrical contacts can be checked quickly and easily. Various types of... [more]
circuit from:http://www.extremecircuits.net/2010/04/continuity-tester-circuit-diagram.html
September 30, 2010
This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that all diodes are shorts and their associated 1kO resistors open.... [more]
circuit from:http://www.extremecircuits.net/2010/05/switchable-output-crystal-oscillator.html
September 27, 2010
Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe you’ve come home to find your aquarium fish trying to swim across the carpet?... [more]
circuit from:http://www.extremecircuits.net/2010/04/water-alarm-circuit-diagram.html
September 27, 2010
This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted on top of the recipient (e.g. a... [more]
circuit from:http://www.extremecircuits.net/2009/12/water-level-alert-circuit-schematic.html
September 27, 2010
Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, engine control with injection calculators, airbag activation, or other various functions, called comfort functions. Among them is... [more]
circuit from:http://www.extremecircuits.net/2010/05/automatic-windshield-washer-control.html
September 27, 2010
This timer was designed for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. A Rotary Switch sets the timer according to six classified Photo-types (see... [more]
circuit from:http://www.extremecircuits.net/2009/12/tan-timer-circuit-diagram.html
September 27, 2010
We've called it the Itsy Bitsy USB Lamp. It is such a delightfully simple idea we're wondering why no-one ever thought of it before. It started life (and continues) as a student project at Massey... [more]
circuit from:http://www.extremecircuits.net/2010/03/itsy-bitsy-usb-lamp.html
All posts