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How does this circuit work ?

HI everyone ..

I have done this circuit , but I have to write some lines to describe it ..

can you help me please


* this is the circuit

Picture of How does this circuit work ?
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Surely you can find out how it works from the site you downloaded it from ?

Steve
layal_1 (author)  steveastrouk5 years ago
I acutely got it from this link

http://www.youtube.com/watch?v=zWPwtay0dxM

check it please :)

Thank you
Pair of astable multivibrators. One runs at a lower fixed frequency, the other doesn't.
layal_1 (author)  steveastrouk5 years ago
what is the Purpose and interest of these part (why do we have to use it in this circuit )?

- 555
- multivibrator
- polar capacitor
- non polar capacitor
my project will be tomorrow I need your help please

Read what I have written in my report . tell me if I'm wrong

Description:
• 555 used two times because we want to produce two different voice in the same time .
• Pair of astable multivibrators. One runs at a lower fixed frequency, the other doesn't.
• Variable resistor used to produce different frequency for each 555 and to control the voice .
• Resistor used to protect the capacitor from damage .
• Ceramic Capacitor (non polar capacitor) used in a circuit that has high frequency like police siren .
• Electric capacitor ( polar capacitor) used because it has a high capacitance to store the voltage and it has a small resistor .


Thank you so much :)




The variable resistors do different jobs in each circuit - find a site that shows all the possible conenctions for a 555 - particularly, and here's a clue "VFO"

The polar caps here are largely used because its a cheap way to get lots of capacitance. Likewise, non-polar caps are avaliable in smaller sizes.

Steve