Transistor circuit with a self-holding circuit for a relay
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United States of America Patent
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-
May 28, 1996
Grant Date -
N/A
app pub date -
Oct 13, 1994
filing date -
Oct 18, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A self-holding circuit is provided with an input terminal (2), an output terminal (3), a self returnable push switch (SW2), a first transistor TR1), a first time constant circuit (R3 and C1) having a predetermined charging time constant (T1), a second transistor (TR2), a relay (RL), first and second diodes (D1, D2), a second time constant circuit (R8, R9 and C2) having a predetermined discharging constant (T2), and a third transistor (TR3). The circuit may be switched on by a first pushing operation of the push switch and switched off by a second pushing operation of the same push switch.
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