Title:
REFERENCE FREQUENCY AUTOMATIC SWITCHING CIRCUIT
Document Type and Number:
Japanese Patent JPS6055863
Kind Code:
A
Abstract:
PURPOSE:To enable to control a speed by a remote control from outside without operating a changeover switch by providing a circuit for electrically isolating an internal reference frequency by an external reference frequency at the body side. CONSTITUTION:When an external oscillator 21 is oscillated in case that a body 10 and an external circuit 20 are connected to a cable 30, a transistor Q is turned ON and OFF. The output of the transistor Q is applied to an input terminal of a comparator U so that the output of an internal oscillator 11 is not transmitted to an OR gate G. The output of the oscillator 21 is applied to the other input terminal of the gate G as it is at this time, the output becomes a reference frequency fS as it is, and is inputted to a speed controller 40. In this state, the remote speed control can be performed by varying the oscillating frequency of the oscillator 21.
Inventors:
TANAKA HIROYUKI
Application Number:
JP16098483A
Publication Date:
April 01, 1985
Filing Date:
September 01, 1983
Export Citation:
Assignee:
FUOSUTEKUSU KK
International Classes:
G05D13/62; G05F1/00; H02M7/48; H02P29/00; (IPC1-7): G05D13/62; G05F1/00; H02P5/00
Attorney, Agent or Firm:
Ijima Fujiharu
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