Title:
CONSTANT CURRENT SOURCE FOR FIELD CONTACT INPUT
Document Type and Number:
Japanese Patent JPS5953915
Kind Code:
A
Abstract:
A circuit acting as a constant current source somprises a transistor (Q1) having an emitter to base unction forward biased by a voltage of from 24 to 125 volts DC on a terminal (14). A 5.6 volt Zener diode (D1) is connected between the base and the voltage supply terminal (14) and a light emitting diode (D1) is connected between the collector and a field contact (6). A substantially constant current supply is provided over the abovementioned voltage range.
Inventors:
RENAADO RARUFU PORINSUKI JIYUN
Application Number:
JP14888983A
Publication Date:
March 28, 1984
Filing Date:
August 16, 1983
Export Citation:
Assignee:
BABCOCK & WILCOX CO
International Classes:
G05F1/38; G05F1/56; H02J1/00; G05F3/18; H01H1/60; H02J1/04; H03K17/78; (IPC1-7): G05F1/56; H02J1/00
Domestic Patent References:
| JPS54107250A | 1979-08-22 | |||
| JP52093452B | ||||
| JP50090130B |
Attorney, Agent or Firm:
Motohiro Kurauchi