DEVICE FOR DETERMINING NUMBER OF REVOLUTIONS OF SHAFT OF AUTOMOBILE ENGINE WITH CHROMATICITY BLOCK AND COLOR INDICATOR Russian patent published in 2007 - IPC G01P3/48 

FIELD: engineering of devices for singling out useful signal, received on background of interferences, possible use for identification of object, expressed in form of electric signals, and providing information about the object in automatic image recognition systems.

SUBSTANCE: device for singling out useful signal, received on background of interferences, contains resonance filter, made on basis of a pair of operation amplifiers, included in a circuit with approximately equal amplification, where aforementioned amplifiers are connected by means of high frequency filter, containing capacitor and resistor, and have common negative check connection, including high frequency filter which contains capacitor and resistor. Block for indicating useful signal received on background of interferences, includes light-emitting diode, containing minimum one crystal for each of blue, green and/or yellow, and also red luminescence colors and several operational amplifiers, minimum some of which are connected to device for singling out aforementioned useful signal.

EFFECT: improved characteristics of claimed device, namely, signal/noise ratio, simplified construction, optimal synchronization of output signal of transformer with displaying of number of revolutions in dynamics of automobile acceleration; simplified adjustment of device and expanded operation temperature range of device.

2 cl, 3 dwg