| 摘要 |
PURPOSE:To count securely magnetic balls supplied successively by inputting the output of a detecting element to a differentiation circuit when variation in the amount of magnetic flux from a magnet piece is detected by the detecting element. CONSTITUTION:The output of the magnetic detecting element 3 is amplified by an amplifier 7, a schmitt trigger circuit 8 forms a pulse waveform, and a count waveform is obtained by an output-stage amplifier 9. Therefore, the circuit outputs the pulse waveform all the time even when the difference between pieces of magnetic flux phimax and phimin is small. The detecting circuit has a Hall element, amplifier, etc., integrated on the same chip by integrating technique. Its output is therefore a switch type digital output, so DTL, TTL, etc., can be connected as a load circuit connected as a rear stage and the detecting circuit and rear-stage circuit can be driven directly, so that the circuit constitution is simplified on the whole. |
