Prevent signal when device is turned on



I have one of the output pins of a 16F84A hooked up to a transistor
which in turn drives a relay. Though the software can drive that pin
low, my concern is that during power up there might be enough current
to switch the transistor.

Since this is a kit-type project I can not do major modifications, so
is there a simple way to bypass the base for a brief period of time
and only when the signal is high for a longer time will it actually
switch the transistor ?

.



Relevant Pages

  • Re: Prevent signal when device is turned on
    ... which in turn drives a relay. ... to switch the transistor. ... and only when the signal is high for a longer time will it actually ...
    (sci.electronics.basics)
  • Re: Prevent signal when device is turned on
    ... which in turn drives a relay. ... to switch the transistor. ... and only when the signal is high for a longer time will it actually ...
    (sci.electronics.basics)
  • Re: Prevent signal when device is turned on
    ... which in turn drives a relay. ... to switch the transistor. ... and only when the signal is high for a longer time will it actually ...
    (sci.electronics.basics)
  • Re: Prevent signal when device is turned on
    ... which in turn drives a relay. ... to switch the transistor. ... and only when the signal is high for a longer time will it actually ...
    (sci.electronics.basics)
  • Re: Prevent signal when device is turned on
    ... the pins are in high Z until ... my concern is that during power up there might be enough current ... to switch the transistor. ... and only when the signal is high for a longer time will it actually ...
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