Simple Project new burglar alarm

Advance Burglar alarm from dual-op amp



Device such as burglar alarms and sirens, whose basic purpose is to monitor certain conditions, make enjoyable projects because of the verity of sounds they can generate. Figure 1 shows a simple siren/alarm circuit using a dual-amp MC1458, audio amplifier LM380, and a 1-W speaker. The dual op-amp is used as a signal generator that produces square, pulse and triangular or sawtooth wave froms.

The operation of the circuit is as follows. The A1 and A2 op-amps make up a waveform generator in which the output of A1 is a square wave or pulse waveform and that of A2 is either a triangular or sawtooth waveform. The potentiometer R2 controls the frequency as well as the type of output waveform of op-amps A1 and A2. The switch SW1 connect the output of A1 or A2 to the audio power amplifier LM380, this in turn drives the speaker. Although not used in the circuit of figure 1, a potentiometer may be connected between (+) and (-) inputs of the power amplifier to control its voltage gain, which in turn controls the sound volume. The sound level produced depends on the position of switch SW1, the wiper setting of potentiometer R2, and the value of capacitor C4. Therefore, sound of varying intensities can be obtained by adjusting SW1, R2, and C4.

For higher output power (sound intensities), audio power amplifier may be used in the bridge from. This configuration will also require a higher wattage speaker.


PARTS LISTS
Resistors (all ¼-watt, ± 5% Carbon)

R1, R­4 = 10 KΩ

R2 = 20 KΩ potentiometer

R3 = 39 KΩ
Capacitors

C1, C3 =0.1 µF

C2 = 100 µF

C­4 = 0.05 µF
Semiconductors

IC1 = MC1458 dual op-amp

IC2 = LM380 audio power amplifier

Miscellaneous

8Ω 1-W speaker

SW1 = Three-position switch



Simple Project new burglar alarm simple burglar alarm circuit project simple burglar alarm with arduino how to make a simple burglar alarm how to make a simple burglar alarm using home materials simple burglar alarm circuit diagram make your own simple burglar alarm how to make a simple security alarm Searches related to simple burglar alarm circuit project burglar alarm circuit diagram simple circuit simple burglar alarm with arduino how to make a simple burglar alarm how to make a simple burglar alarm using home materials simple fire alarm circuit project Searches related to how to make a simple burglar alarm how to make a simple burglar alarm using home materials how to make a simple burglar alarm at home homemade burglar alarm how to disable a burglar alarm how to disable burglar alarm system do home alarms deter burglars how to make a security alarm how to make a room alarm