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how can i increase and rise the voice in my circuit ? Answered

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 hello 

My project called " Four Tone Siren " 

this is the circuit for my project .... I really need to increase the voice

because it's very small you can't hear it except if you put the circuit close to you  

and i only hear 3 tone and my project is 4 tone.

 can you tell me please what is the reason ?

my final project after 2 days please :( 

this is my parts :

IC UM3561
Resistance = 220 Ohms
Condenser 100Mfd
Transistor BC548
Battery Container 3V
Switches
Breadboard

4 Replies

user
iceng (author)2012-05-12
user
layal_1 (author)iceng2012-05-13

thank you I will try your circuit then tell you :)

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user
steveastrouk (author)2012-05-12

The datasheet that Canucksgirl flagged yesterday has all you need.

http://electroschematics.com/wp-content/uploads/2010/03/UM-3561-Datasheet.pdf

Your problem is that the resistor to the base of the transistor is too small, and its over loading the chip.

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user
layal_1 (author)steveastrouk2012-05-13

than you I will read the datasheet ... . it's very helpful :)

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