Search Results for: circuit diagram of siren
This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3 seconds for frequency sweeping down. You can change the warbling frequency of this alarm siren by changing the C1 capacitor value. You can vary the value between 10 uF …
Read MoreThis circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles, and bicycles for fun kid not only that, this circuit also used in models and other games. The oscillation of IC1A and IC1B gates produces the …
Read MoreThe circuit below consists of two multivibrators. The first multivibrator provides the speed of the change from “hee” to “haw” and operates at a low frequency. By allowing full voltage to appear at the bottom of the 220R and then a slightly lower voltage when LED is illuminated will modified the voltage to the tone …
Read MoreTo extend the measurement range of an available ADC(analog to digital conveter) we can use this autoranging. If it implemented on multiplexed input, this circuit will give best result. To adjust an ADC’s full-scale range we use a system autoranging that use LTC1257 because it is appropriate for system autoranging. During …
Read MoreFading a video signal can’t be done simply by attenuating the composite signal, since the synchronization signal may drop below unacceptable level. Here a circuit to overcome the problem: Most of video signals will works with this circuit, except for very noisy or distorted signals. The rest circuit is an LT1251 video fader …
Read MoreGamma correction need to be applied in video processing since the transfer function of video acquisition and video display is non linear. Here is the schematic diagram of a gamma circuit: If gamma value equal to 1, the the transfer function is linear. Typical CRT usually have gamma factor from about 2.0 to …
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