QKits Electronic Kits: K2625, Digital Tachometer kit

Digital Tachometer Kit Velleman Kit K2625

Features:

	2-digit LED display
	Adjustable display brightness
	Suitable for 2- and 4- stroke petrol engines
	Configurable for engines of between 1 and 12 cylinders
	Simple installation and calibration
	Front panel included
	Contact bounce suppression

Specifications:

	Supply voltage. 10 to 15V DC, unstabilsed
	(built-in regulator)
	Supply current: 200mA (maximum)
	Display range: 100 to 9,900rpm
	Resolution: 100rpm
	Display type: 2 x 0·5in., 7-segment LED
	(static)
	Input sensitivity: 3V (minimum) 20V (maximum)
	Input impedance: 30kW (typical))
	PCB Dimensions: 80x45mm (3.2"x1.8")+ 80 x 60mm (3.2" x 2.4"))
	Front Panel Dimensions: 70 x 90mm (2.8 x 3.5")

The majority of modern cars, and practically all 'high performance' models, are equipped with a tachometer, or rev counter, which gives an indication of the number of revolutions per minute (rpm) that the engine's crankshaft is turning at. This is a very useful instrument to have, since it enables the driver to maintain the engine turning at its most efficient rate for the maximum production of either power (BHP), or torque (the pulling force being exerted), factors which coincide with specific engine speeds (the values for which may be found in the vehicle handbook, or magazine road test reports). Hence, this can be used to give maximum acceleration, or optimum flexibility, particularly useful when climbing steep inclines or towing caravans, boats, etc. An additional use for a tachometer is as an aid to servicing, since it enables the engine idling speed to be set to the value specified by the manufacturer, in the event of it idling too fast or slow, as is often the case. However, many older, or 'base-spec' vehicles, are not equipped with a tachometer. This situation is easily rectified, by installing the digital version presented here, which is simple to fit, calibrate and use. Furthermore, by using a suitable sensor (ie. one that simulates the switching action of the contact breaker), the unit allows rpm measurement, or the number of movements per minute, of any rotating or moving mechanical part - it does not necessarily have to be an engine!

	~ Celebrating 12 Years of QualityKits in 2008 ~		06-Oct-2008