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jow voltage battery beeper

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kishoretvk

New Member
hello guys
please do help me to develop theory on the circuit below i need to explain for a semnar

the circuit lies in the below url

please telll me wat theory is needed to explain the ic's 555 timer n the transistor working there
how is the duty cycle changed


Battery Low Voltage Beeper

my maill id iskishoretvk9@gmail.com

8367-lvbeep.jpg
 

MikeMl

Well-Known Member
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Hero999

Banned
This looks like an over complicated way of doing it.

This simplest is to use an LM311 and a pulsed piezo buzzer.

If you must build your own oscillator, then I'd opt for a quad LM339, configure one as a low frequency oscillator, the second as an audio frequency oscillator and the third as a comparator.

I don't see any reason why this should require more than one IC plus a voltage reference.
 
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