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American Police Car Siren (linscott) - Scroll down to locate this 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....(electronic design added 08/08/08) |
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AN16 Automotive & Household Siren Driver Circuits: Zsd100 & Discrete 'H'-Bridge
Minimum Parts Count Solution - Zetec Semiconductors Applications Notes A
solution is provided that uses a minimum number of components by utilising an
application specific signal generation IC, and a high efficiency 'H'-bridge effected
with 3A DC rated Super-δ TO92 style switching transistors. (app note added
6/06) |
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Assortment of Siren Circuits - ….(circuit design added 03/08) |
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British Police Car Siren - The first circuit simulates the siren of a British
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 a 1 Hz astable
multivibrater....(electronic design added 08/08/08) |
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Electronic Police
Siren - The sound produced imitates the rise and fall of an American police siren.
When first switched on the 10u capacitors is discharged and both
transistors...(electronic design added 08/08/08) |
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Electronic siren - An electronic siren made from discrete components.
(schematic added 03/04/05) |
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Emergency Siren Simulator - This siren circuit simulates police, fire or other
emergency sirens that produce an up and down wail. (circuit design added 08/08) |
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Factory Siren - This circuit produces a sound similar to a factory siren. It
makes use of a 555 timer IC used as an astable multivibrator of a center frequency of
about 300Hz. The frequency is controlled by the pin 5 of the IC. When the supply is
switched ON, the capacitor charges slowly and this alters the voltage at pin 5 of the
IC hence ....(added 05/07) |
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One IC 2 Tones Siren Double Tone Police Sound Single Tone Old Ambulance Sound -
This circuit is intended for children fun, and is suitable to be installed on
bicycles, battery powered cars and motorcycles, but also in models and other games.
With SW1 positioned as shown in the circuit diagram it reproduces the typical dual
tone sound of Police....(added 6/06) |
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One IC Two-Tone Siren - Double tone Police sound. Single tone old ambulance
sound. (electronic circuit added 06/07/08) |
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Police Car Siren - This siren circuit simulates police, fire or other emergency
sirens that produce an up and down wail. (circuit design added 08/08) |
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Powerful Siren - Simple circuitry No ICs 12V Battery operation (added 9/04) |
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Red Alert Star Trek Alarm - Scroll down to locate this circuit. The third circuit
simulates the "Red Alert" siren from the TV show Star Trek. 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 1.5 second non-symmetrical....(electronic design
added 6/07) |
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Screamer Siren - This is a low-cost screamer circuit to add to our range of alarm
modules. It has been designed to protect your valuables on a 24 hour basis…..(circuits
added 06/09) |
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Simple Siren - This project is built on the third section of the PC board,
identified by "SIREN" and "Project 5." You will notice the similarity between this
circuit and the LED FLASHER circuit from project 2. The only differences are the LED
has been removed and the 22R resistor has been replaced by a mini speaker....(design
added 04/09) |
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Siren circuit - This siren circuit simulates police, fire or other emergency
sirens that produce an up and down wail.…(added 07/07/07) |
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Siren circuit (page 84) - This circuit was requested by several correspondents.
Its purpose was to obtain more power than the siren circuit already available on ...
(added 07/07/07) |
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Vehicle Car Siren - This siren circuit simulates police, fire or other emergency
sirens that produce an up and down wail. (circuit design added 08/08) |
