Optical-pick-up-tachometer


Posted on May 22, 2012

Remote, noncontact, measurement of the speed of rotating objects is the purpose of this simple circuit. Linearity and accuracy are extremely high and normally limited by the milliammeter used and the initial calibration. This circuit is configured to count the leading edge of light pulses and to ignore normal ambient light levels. It is designed for portable operation since the tachometer is not sensitive to supply voltage within the supply voltage tolerance.


Optical-pick-up-tachometer
Click here to download the full size of the above Circuit.

Full scale at the maximum sensitivity of the calibration resistance is read at about 300 light pulses per second. A digital voltmeter.can be used, on the 100-mV full-scale range, in place of the milliammeter. Shunt its input with a 100-0 resistor in parallel with a 100-~F capacitor. This rc network replaces the filtering supplied by the analog meter.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

60W Guitar Amplifier
-15 V 1-A Regulated Power Supply
38KHz or 40KHz signal generator
High q notch filter
Water Level Controller
Transform electromyographic signals into music
Automatic Street Light Controller Circuit
Automatic battery charger circuit using lm301-2
PWM Lamp or Motor Controller
Vehicle Detector
I2C Interfacing Acceleration Sensing PCF8591
Analog PWM connection with FIG zps-101 interface
Complementary symmetry FET operating principle
200W Valve RF Transmitter circuit



Top