May I suggest that you take a completely different tack. My father; God
rest his soul; worked three jobs to support eight children and sleeping
in on Sunday morning was one of his few luxuries of life. When I found
him working away in the little crawl space over the front porch on a
Saturday evening I failed to connect it to the previous Sunday's visit
by Proselytizers for one of the Saturday sabbath groups with an
evangelical approach to heathen slothfulness on Sunday mornings. Our
house being a ranch which my father had built with his own hands my
bedroom window had the best view of the front porch. Sunday morning at
seven my father and brother and I were watching the walk from a half
inch gap under the nearly drawn shade in the room I shared with my
brother. My father did not invite my sisters or my mom to this event.
As he apparently expected the missionaries came up the walk and pushed
the doorbell. There followed a whooshing sound and the four sprinkler
heads my father had installed in the porch roof the night before began
discharging nearly forty gallons of water of water per minute onto their
pious forms. We had no trouble with them after that.
I'd like to see some sort of device that would disable the doorbell for
thirty seconds after the button was pressed the first time. I don't know why
people think I'll get to the door faster if they ring the bell a dozen times
instead of once.
Time delay relays can be expensive. For example a 24AG-KRP11 Interval On
relay is almost $80. I suppose I could use an IC to drive an inexpensive
relay but then I'd have to build a power supply. How many milliamps are
available from a doorbell transformer?
This is quite simple to do. You can even keep your existing doorbell. Go
buy a single toggle single throw switch. If you have a plastic case (the
'cheap' type that builders put into houses), you can drill a hole in it and
put the switch in the case. You have two ways to electrically connect the
switch. You can interupt the power supply or the switch. Personally, I
would interput the power supply to the bell. Find the two wires that
connect the doorbell to the transformer disconnect the positive one
(probably the red one if red and green are the two wire colours). Connect
one side of the switch to the wire that you disconnected and connect the
other side of the switch to the terminal on the bell. It is good pratice to
interput the +ve line, but since we're working with very low DC voltage it
really doesn't matter. If the power from the transformer goes to the
doorbell button, you have to connect it like the later case. Simply put the
switch in as in the former case.
Here is a little ASCII schematic. It's the same schematic for both setups,
except in the second setup, the SPDT-switch is between the doorbell button
and the doorbell:
NOTE: by doing this, if you have a light on the pushbutton (outside), it
will go off when you turn off the switch.
Give me a shout if you need a better picture or this doesn't make sense (I'm
an electrical engineering student -3rd year, so this is pretty basic stuff
to me and I sometimes forget that it isn't to others).
If your doorbell is located where you can easily reach up and touch it
I'd suggest that an good spot you to mount a miniature toggle switch
would be right through a hole drilled in the doorbell's housing. That'd
eliminate the need to run any additional wires.
One like this from Radio Shack should do the job:
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