Alarm

we certainly can never hear how the alarm sounds are presented from a police car or ambulance. Such units are very expensive if we buy it in the form of so. but how disappointed we did not need to if we want to have units such as these by making
own and do not reduce the quality and quality, setting the size of the volume can be done through potensio
Resistor :

R1 ………………. 27 k

R2 ………………. 68 k

Kapasitor :

C1 ……………….. 100 mikro F/12V

C2 ……………….. 0,02 mikro F

C3 ……………….. 50 mikro F/12V

Transistro :

TR1 ……………….. 2N 554

TR1 ……………….. 2N 554

Speaker …………………………… 2 inchi