MAXIMUM_ACCELERATION_RECORDING_CIRCUIT

Published:2009/7/16 4:27:00 Author:Jessie | From:SeekIC

The circuit (see figure) includes three 9 V batteries,one of which supplies the 9 V needed by the circuit,and all of which supply the 27V needed by the accelerometer Power is supplied to the accelerometer through field－effect diode D1,which regulates the accelerometer current to keep it In the range of 2 to 4mA. The accelerometer puts out an ac signal that peaks at a full-scale value of 5V when the ac component of acceleration reaches 50g(where g denotes normal Earth gravitation)The acceleration signal is coupled through C1 and D2 into C2,which retains the peak value for a short time The signal is fed through potentiometer R1 to the input terminal(pin 5) of a 10-level display driver,LM3914,that has equally spaced levels,each representing 5g, or of a similar circuit,LM3915,that has logarithmically spaced levels,with each succeeding level representing division of the next higher level by a factor of √2 (3 dB/step) Depending on the level of the input signal,the display driver energizes one of its ten output lines,each of which IS connected to one of ten 2-mA transparent-cap microfuses plugged into a module,If the fuse on a lineis still intact,then when that line is energized,the driver delivers a current of 10 mA, blowing the fuse The fuses can be inspected visually or electrically at any convenient time thereafter to determine which (if any) has blown、thereby determining what level of acceleration was reached.



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