Calibrated tuneable monitor

Details Calibrated tuneable monitor Calibrated tuneable monitor

1974-08-14

1979-01-30

Trafton, David L.

Communications: electrical

Condition responsive indicating system

Specific condition

340674, G08B 2100

Patent

active

041375297

ABSTRACT:
A calibrated tuneable monitor for use with multi-row planting apparatus includes means for sensing the number of seeds delivered to furrows formed in a field and controlling an indicator to give a visual readout to the operator of the planting apparatus as to whether the number of seeds planted is at least equal to a predetermined minimum value which is preset by a selector dial. The seed monitor system has a DC coupled monostable circuit for producing a pulse of given pulse width for each pulse produced by a seed sensor. The pulse from the DC coupled monostable circuit is then integrated and formed into a voltage which is proportional to the rate at which pulses are received. This voltage is then compared in a voltage comparator circuit to control the operation of an indicator.

REFERENCES:
patent: 3675199 (1972-07-01), Jamison et al.
patent: 3691462 (1972-09-01), Grundy
patent: 3723989 (1973-03-01), Fathauer et al.
patent: 3798529 (1974-03-01), Jones

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