Emergency Siren | Electronic Project Circuits

Posts Tagged ‘Emergency siren’

Ambulance sirens circuit

This circuit is a circuit that sounds a siren-like sound of ambulance sirens. This circuit is different to an ambulance siren circuit generally, is to use transistors instead of IC 555. Which allows economical and easy to tailor a network.
Operation of the circuit. This cycle can be divided into three main parts is the low frequency production. Production of high frequency. The amplifier. The manufacture low-frequency includes Q1, Q2, R2, R3, C2, C3. Which will produce low-frequency out and to extend the Q3. Before you sent with high frequency of origin from Q4, Q5, R8, R9. , C5, C6 signal is included, then the output will come out to the leg E of the Q5. and then be expanded with Q6 to drive the speakers. The C1, C4 is intended to stir filter collects them. The R11 will help prevent speaker damage.

Be the first to comment - What do you think? Posted by admin - November 27, 2010 at 11:24 pm

Categories: Alarm systems Tags: Ambulance sirens, Emergency siren

Op-amp siren sound using ic 741

This circuit is the sound generator super siren, for use be alarm signal get by live frequency generator circuit that use , op-amp circuit. The principle works to are while still no press switch S1 will still have no the loud sound comes out from a loudspeaker SP1. When do pressure switch S1 then liberate C3 do something charge full until while press switch S1 and discharge go out. When liberate switch S1 come in at R7. Which perform in something limit current come in at 3 Non inverting legs of IC1a. By IC1, D1, D2, C1, C2 and R5 build be sound generator signal circuit then export come to way pin 6 of IC1a come to reach at pin 3 (Noninverting) of IC1b. By have R1 and R2 build be Dectector circuit. For do fining level has signal then signal to come out the way pin 7 of IC1b which will have flowing through comes in at pin B of Q1 for do something bias give Q1 bias. When Q1 work then make SP1 make a noise loud come out and make a noise poor loud C3 discharge be finished SP1 then stop make a noise loud.

Be the first to comment - What do you think? Posted by admin - June 30, 2010 at 11:08 pm

Categories: Alarm systems Tags: Emergency siren, lm741 circuits, Op-amp circuit

Emergency power siren 6 watt

This be Emergency power siren Circuit 6 watt sizes. It use Digital IC number IC 4011 perform produce the frequency pulse generator, be beep danger character. And have power mosfet wasp use a loudspeaker 8 ohm sizes and are large-sized loudspeaker. for have a voice as the last. For power supply Source use 12 Volt sizes that have can give current get tall about 1 Amp a little like and Power Mosfet should hold let off the heat with. The detail is other , friends , see in the circuit has yes.