LED


Phone In Use Indicator

With this circuit mounted in or near every phone in the house, it will allow users to know if the phone is being used and not to pick up the phone. When a phone is taken off hook, the voltage across the tip and ring terminals drops to 10 volts or less. This will cause […]


Telephone In-Use Indicator Circuit

This circuit will illuminate a LED if one of your telephones is in use. It should work in all countries (Including UK) that have a standing line voltage above 48 Volts DC. Please note that it is illegal to make a physical permanent connection to your telephone line in some countries (this includes the UK […]


Mini Lithium Torch

This mini pocket torch combines the advantages of Lithium button cells with a super-bright white LED. The lithium cells are small, have a long shelf life and have very little self-discharge. The LED has very high efficiency, an extremely long life expectancy and a modest current consumption (20mA). In combination this results in an exceptionally […]


Cupboard Lights circuit

This Cupboard lights circuit is an automatic White LED lamp used to illuminate the interior of cupboard to search things. The lamp automatically turns on when the door of the cupboard opens and stays on for three minutes then turns off. The circuit uses the popular timer IC NE 555 for the time delay. Components […]


DC or AC Voltage Indicator

Detects 1.8 to 230 Volts DC or AC, Minimum parts counting 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 to the negative, the Red LED will illuminate. Reversing […]


Fuse Monitor

The idea for this project may have come to me in a flash of inspiration, and its a very simple way to check if a fuse has blown without removing it from its holder. The simplicity of this circuit uses just two components, but with just one resistor and an LED this circuit gives visual […]


Phone Line Polarity Checker

Do you suspect your broadband speed (DSL) is slower than it should be? It could be as simple as incorrect polarity in your phone wall socket. Build this very cheap, very simple device to find out whether you need to change your wiring! It might not seem that telephone line polarity is important, since the […]


Knightrider lights for model cars.

This simple circuit drives 6 LEDs in ’Knightrider scanner mode’. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version). Here’s the circuit: Note that VDD and GND for the ICs are not shown in the circuit drawing. Pin-outs: (7)555 4017 1 GND 1 Q5 9 Q8 […]


IR Light Dimmer v.1

This is a device for adjusting lights in your home with any type of remote controller (tv, dvd, video,…). Today we are using many devices in our homes to improve quality of our life and this is another example on how you can enhance a simple procedure like switching the lights ON/OFF. It may be […]


Toyota Solara Wiring Diagram Electrical System Troubleshooting

The Toyota Camry Solara, also more commonly known as the Toyota Solara, is a mid-size coupe/convertible designed and engineered by Toyota, first introduced in 1999. The following wiring diagram and electrical system troubleshooting has been prepared to provide information on the electrical system of the 2006 CAMRY SOLARA (MCV31 Series and ACV30 Series). This manual […]