http://www.simplecircuitdiagram.com Free Simple Circuit Diagram Tue, 24 Jan 2012 02:31:05 +0000 en hourly 1 http://wordpress.org/?v=abc http://www.simplecircuitdiagram.com/2010/12/08/two-tones-ambulance-alarm-circuit/ http://www.simplecircuitdiagram.com/2010/12/08/two-tones-ambulance-alarm-circuit/#comments Wed, 08 Dec 2010 02:11:30 +0000 Rend http://www.simplecircuitdiagram.com/?p=2116 Using very popular multivibrator 555 IC, we can build an alarm circuit which is similar to old ambulance siren. There are two sections inside the circuit, first is a low frequency oscillator for two level frequency modulation, and the second … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/08/two-tones-ambulance-alarm-circuit/feed/ 0 http://www.simplecircuitdiagram.com/2010/07/18/ambulance-hee-haw-siren/ http://www.simplecircuitdiagram.com/2010/07/18/ambulance-hee-haw-siren/#comments Sun, 18 Jul 2010 01:53:26 +0000 Rust http://www.simplecircuitdiagram.com/?p=1256 The 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 … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/07/18/ambulance-hee-haw-siren/feed/ 0 http://www.simplecircuitdiagram.com/2010/06/25/fastest-quiz-bellalarm/ http://www.simplecircuitdiagram.com/2010/06/25/fastest-quiz-bellalarm/#comments Fri, 25 Jun 2010 01:51:19 +0000 Rend http://www.simplecircuitdiagram.com/?p=1237 This is aquiz bell/alarm circuit. This circuit indicate “fastest finger first”. This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/06/25/fastest-quiz-bellalarm/feed/ 0 http://www.simplecircuitdiagram.com/2009/12/24/dual-tone-single-ic-siren/ http://www.simplecircuitdiagram.com/2009/12/24/dual-tone-single-ic-siren/#comments Thu, 24 Dec 2009 10:37:56 +0000 Adam http://www.simplecircuitdiagram.com/?p=326 This 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 … Continue reading →]]> http://www.simplecircuitdiagram.com/2009/12/24/dual-tone-single-ic-siren/feed/ 0 http://www.simplecircuitdiagram.com/2009/05/18/wailing-alarm-siren/ http://www.simplecircuitdiagram.com/2009/05/18/wailing-alarm-siren/#comments Mon, 18 May 2009 10:34:17 +0000 Adam http://www.simplecircuitdiagram.com/?p=63 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 … Continue reading →]]> http://www.simplecircuitdiagram.com/2009/05/18/wailing-alarm-siren/feed/ 0