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September 27, 2010
This circuit is not a novelty, but it proved so useful, simple and cheap that it is worth building. When the positive (Red) probe is connected to a DC positive voltage and the Black probe... [more]
circuit from:http://www.extremecircuits.net/2009/08/dc-or-ac-voltage-indicator-circuit.html
September 27, 2010
This sensitive circuit is basically a comparator, detecting very slight temperature changes in respect to the ambient temperature. It was primarily intended to detect draughts around doors and windows that cause energy leaks but can... [more]
circuit from:http://www.extremecircuits.net/2010/01/energy-leak-detector-circuit-diagram.html
September 27, 2010
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-core cables to the mains plug. Due to prolonged usage, the power... [more]
circuit from:http://www.extremecircuits.net/2010/05/invisible-broken-wire-detector.html
September 27, 2010
If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5... [more]
circuit from:http://www.extremecircuits.net/2009/12/live-line-detector-indicator-circuit.html
September 27, 2010
This simple circuit can be used to activate whatever you like, for example, by connecting it to microcontroller, relays, secret alarms, robot applications or just turn on LED1 which lights up as long as you... [more]
circuit from:http://www.extremecircuits.net/2010/05/simple-one-wire-touch-detector.html
September 27, 2010
This circuit is suitable in every situation where over-current protection is required. Here we give an example from the model train world. Every seasoned model train enthusiast knows that there is nothing worse than having... [more]
circuit from:http://www.extremecircuits.net/2010/05/simple-short-circuit-detection.html
September 27, 2010
When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. The small circuit built around IC1 draws... [more]
circuit from:http://www.extremecircuits.net/2009/12/water-level-indicator-circuit-schematic.html
September 27, 2010
A dimmer is quite unusual in a caravan or on a boat. Here we describe how you can make one. So if you would like to be able to adjust the mood when you’re entertaining... [more]
circuit from:http://www.extremecircuits.net/2010/05/12v-dimmer.html
September 27, 2010
This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the... [more]
circuit from:http://www.extremecircuits.net/2010/01/bicycle-back-safety-light-circuit.html
September 27, 2010
The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate... [more]
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