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Here is an interesting Car Battery Monitor circuit of a low power electronic dc voltmeter circuit that can be used with car electric systems that run on 12 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries.
Safe 12V car adapter described here can be used to limit a +12 volt car battery current, available from the in-dash cigar lighter power port, to below 2.6 Amperes for use with portable electronic gadgets and travel chargers on long car journeys. This circuit will protect the car electric system against possible short circuits across the cigar power port.
We received an interesting mail from Daniel Davies with a great idea for an electronic theft prevention gadget for vehicles. The gadget is called G-Spot and it prevents the engine from starting until your vehicles gadget is physically touched at the same time as the key is held in the ‘Start’ position. Check the video below.
This circuit is used to simulate the police car lights by alternating flashing strobes seen on British police cars. The IC1a forms a square wave oscillator having adjustable frequency with VR1 to give the best effect.
