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Need Help ... Final Project....

Non89

Nov 2, 2010
7
Joined
Nov 2, 2010
Messages
7
i want to make a doorbell , after pressing 3 time or 5sec after without responce, another recorder circuit will work for record the visitor voice.... so how can i mix up the circuit, is the sensor needed???
 

cute109

Oct 8, 2010
6
Joined
Oct 8, 2010
Messages
6
how about using a timer circuit to start the recorder circuit and a relay for the switching between doorbell and a recorder.
 

eptheta

Dec 20, 2009
188
Joined
Dec 20, 2009
Messages
188
Like what ?

If you want, use a micro controller, that would make everything simple. Just program your chip appropriately. But i guess you want to do it without one...

You could get a binary counter chip like the 4017 and take the appropriate outputs for binary 3 (11) and AND it with a 4081.

Then get a timer circuit (easiest to use is a 555) which has a 5 sec delay attached to a latch or relay. (that is for an adjustable delay, but if you want a such a small delay, you might as well have a large capacitor charging up in series to a PNPs base.)

You need a reset mechanism too, but you can worry about that later..

You should probably wait for someone else to approve this or suggest something way easier...
 

Non89

Nov 2, 2010
7
Joined
Nov 2, 2010
Messages
7
my country hard to find the ISD 1016A Ic ..... got any recorder circuit that having play-back system bt using more population IC??
 
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