Easy Make a Lights On! Schematic

This circuit ensures that you will never again forget to switch on the lights of your car. As soon as the engine is running, the dipped beam...

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Push-Bike Light

Automatic switch-on when it gets dark, 6V or 3V battery operation   This design was primarily intended to allow automatic switch-on of push-...

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Simple Mobile Car Stereo Player

Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music play...

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A Car Battery Monitor

A close call on the road can really focus your mind on the importance of having a battery monitor in a car. I had been enjoying a pleasant w...

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Car Bulb Power Flasher

Derived from the Two-wire Lamp Flasher design, hosted on RED Free Circuit Designs since 1999, this astonishingly simple circuit allows one o...

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Simple Motorbike Alarm

This simple to build alarm can be fitted in bikes to protect them from being stolen. The tiny circuit can be hidden anywhere, without any co...

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22Watt Car Subwoofer Amplifier

22W into 4 Ohm power amplifier, Variable Low Pass Frequency: 70 – 150Hz . This unit is intended to be connected to an existing car stereo am...

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Car Alarm Sound Booster

For car alarms, emphasis should be put on hearing the audible alert and identifying it as belonging to your ‘wheels’. Unfortunately, modern ...

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Car-Reversing Horn with Flasher

Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. The circuit (refer Fig. 1) employs dual time...

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Garage Stop Light

A novel use of solar cells makes positioning your car in the garage rather easier than old tyres, a mirror, or a chalk mark. The six solar c...

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Car Boot Light Warning

On many cars, the boot light will not go out until the lid is properly closed. It is all too easy when unloading the car, to leave the lid a...

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Car Cigar Lighter to USB Power Socket

Nowadays, almost all computer systems have logic blocks for working with a USB port. A USB port, in practice, is capable of supplying more t...

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Car Anti-Theft Wireless Alarm

This FM radio-controlled anti-theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter i...

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Car Battery Saver

I recently forgot to close the door of my car after parking in the garage and I found the battery completely exhausted after the week-end, w...

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Rear Light After Glow (For Bicycles)

This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom a...

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Simple LED Bike Light

On my mountain bike I always used to have one of those well-known flashing LED lights from the high street shop. These often gave me trouble...

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Simple Fog Lamp Sensor

For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. W...

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Motor Bike Headlight Controller

This circuit automatically turns a motor cycle's headlight on and off, independently of both the light and ignition switches, provided t...

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Park-Aid Modification Circuit

This modification was designed on request: some people prefer an audible alert instead of looking at the LED display, making easier the park...

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Speed-Limit Alert

This circuit has been designed to alert the vehicle driver that he/she has reached the maximum fixed speed limit (i.e. in a motorway). It el...

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