Siren Light | Electronic Project Circuits

Posts Tagged ‘siren light’

Siren light from running light

The siren light use that general use motor help in the whirl lamp or refect go to around, which weigh very and when be usable go to for a long time will cause the wearing out. but if we modify light running pretend siren make get siren that weigh light and can be usable for a long time go up.

The work of the circuit will divide the work goes out to are 3 the part, be origin frequency part will compose IC1 555 numbers will perform frequency origin. which fix get with the value of R1, R2 and C1. By send signal the frequency goes out pin 3 ways s of IC1 second part is the part of counter circuit. Which compose IC2 number CD4017. Which build the circuit counts 4 the order. By have the order volt output at 3, 2, 4 pin and 7 respectively whirl to go to continually. Which the speed in the measurement is will under frequency signal at 14 pin of IC2 and in third part be lamp driver circuit. Which compose Q1-Q4 and R3-R6 by have the principle works to are when have voltage level at pin 3 of IC2 have current flow through R3 reach pin B of Q1 make Q1 bias cause L1 and L2 stick bright in case same of at pin 2, 4 and 7. When have voltage level as a result make transistor work by Q1-Q4 will work respectively of a signal from pin 3, 2, 4 and 7 which make lamp bright in order. Read more

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Categories: Alarm systems Tags: Light Running, siren light

American Police Car Siren by IC 555

The second circuit simulates the siren of an American police car. It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is wired as a low frequency astable timer which generates a ramp waveform of about 6 seconds that is buffered by the transistor and again used to frequency modulate the tone generator. The transistor is used to help strengthen the signal to the speaker