https://electronicscheme.net/pyroelectric-fire-alarm-system/?utm_source=rss&utm_medium=rss&utm_campaign=pyroelectric-fire-alarm-system Schematic Diagram & PCB Design Wed, 27 Apr 2016 15:00:06 +0000 hourly 1 https://electronicscheme.net/pyroelectric-fire-alarm-system/#comment-220355 Wed, 27 Apr 2016 15:00:06 +0000 http://electronicscheme.net/?p=1526#comment-220355 I want to use a 7AH battery instead of that little 4AH one. How did you calculated the value of R2 and wich resistor value should I use for it? My calculations are different than yours, based on your circuit.
I mean: 12V*1.4142=16.97V
Now, 16.97V-0.7V = 16.27V. The battery charges at 13.8V so R2=(16.27-13.8V)/x -> R2= 2.47/x
where x= Battery charge current [Ampers]. Doing the maths:
x = 120mA then -> 2.47/0.12= 20.58 ohms.
Why I do have so much different results on my calculations? Is there anything I should know?
Thanks.

]]> https://electronicscheme.net/pyroelectric-fire-alarm-system/#comment-127462 Mon, 08 Oct 2012 05:22:09 +0000 http://electronicscheme.net/?p=1526#comment-127462 VERY GOOD CIRCUIT EXPLANTION . DEAR SIR I WANT REQUIRE SMALL ROBOT PROJECT CIRCUIT DIGRAM WHICH COST IN 1000/
PLEASE SENT MY EMAIL CIRCUIT DIGRAM AND FUNCTION.

]]> https://electronicscheme.net/pyroelectric-fire-alarm-system/#comment-124661 Sun, 11 Mar 2012 13:20:21 +0000 http://electronicscheme.net/?p=1526#comment-124661 the output across ic cd4060 is not getting by appying heat.

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