Multitone Siren Alarm circuit diagram

The circuit is built around the popular CMOS oscillator-divider IC 4060 and a small audio amplifier LM386. The IC 4060 functions as a multitone generator. A 100 H inductor is used at the input of the IC 4060, allowing it to oscillate within the range of approximately 5 MHz RF. The IC 4060 divides RF signals into audio frequency (AF) and ultrasonic ranges. Audio signals of different frequencies are available at pins 1, 2, 3, 13, and 15 of IC 4060 (IC1). This simple schematic illustrates a multitone siren alarm circuit, which is effective for reverse horns, burglar alarms, and various other applications. It generates five distinct audio tones, making it more attention-grabbing than a single-tone siren. The circuit is constructed around the well-known CMOS IC 4060 as an oscillator-divider and the small audio amplifier chip LM386. Additionally, the circuit functions as a two-station intercom, utilizing two wires between each intercom unit. Each unit is self-contained with its own battery, speaker, microphone, and amplifier circuit. The LM386 audio power amplifier is widely available, requires minimal external components, and is well-suited for battery operation. It provides good volume output. The circuit diagram represents a telephone amplifier built around the small amplifier IC LM386. This telephone amplifier is easy to construct and does not require an additional power supply, as it draws power from the telephone line itself. The amplifier delivers a reasonably high volume. The circuit can convert 12V DC to 220V AC and handle small electronic appliances up to 50 Watts.

Component List:
- R1 = 10 MΩ
- R2 = 100 Ω
- R3 = 1.2 kΩ
- R4 = 560 kΩ
- R5-6 = 2.2 kΩ
- R7-8 = 56 Ω 5W
- CX = 22 pF trimmed capacitor
- C1-2 = 22 pF ceramic
- C3 = 8.2 nF 100V MKT
- C4 = 10 µF 16V
- C5 = 47 µF 16V
- C6 = 470 nF 400V
- D1 = 5V6 0.4W
- D2-3 = 47V 1W
- Q1-2 = BS170
- Q3-4 = BD139
- Q5-6 = BD249
- IC1 = 4060
- IC2 = 4013
- IC3 = 4047
- CR1 = 3.2768 MHz crystal.

This circuit also includes an ultrasonic motion detector, which is noted for its high sensitivity to movement. It can be triggered by even minor air movements, such as hot air rising or wind blowing, when the potentiometer is set to a highly sensitive position. The transmitter emits a steady ultrasonic tone at 40 kHz, where the wavelength is significant for detection. Additionally, a simple audio pre-amplifier is integrated into the design, utilizing a single transistor (2N3904). This circuit provides substantial gain to weak audio signals, such as those from an electret microphone, and can be used in conjunction with an RF oscillator to create a highly sensitive RF transmitter responsive to sound.The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multitone generator. A 100 H inductor is used at the input of IC 4060. So it oscillates within the range of about 5MHz RF. IC 4060 itself divides RF signals into AF and ultrasonic ranges. Audio signals of different frequ encies are available at pins 1, 2, 3, 13 and 15 of IC 4060 (IC1). Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and many others. It generates five various audio tones and is much more earcatching than a single-tone siren. The circuit is constructed around well known CMOS IC 4060 as oscillator-cum-divider and small audio amplifier chip LM386. . This a two station intercom. It uses two wires to run between each intercom unit. Each is self contained with its own battery, speaker, microphone and amplifier circuit. An LM386 audio power amplifier is used. It is widely available, used a minimum of external parts and is well suited to battery operation. It will give. The following diagram is the circuit diagram of telephone amplifier, build based small amplifier IC LM386.

This is a easy build telephone amplifier There is no extra electrical power supply required to power up the telephone amplifier circuit, as it draws power from the telephone line itself. The amplifier will supply fairly very good volume. This circuit is able to convert 12V DC to 220V AC dan handle about 50Watt small electronic appliance.

Component List R1=10Mohms R2=100ohms R3=1. 2Kohms R4=560Kohms R5-6=2. 2Kohms R7-8=56 ohms 5W CX=22pF trimmed capacitor C1-2=22pF ceramic C3=8. 2nF 100V MKT C4=10uF 16V C5=47uF 16V C6=470nF 400V D1=5V6 0. 4W D2-3=47V 1W Q1-2=BS170 Q3-4=BD139 Q5-6=BD249 IC1=4060 IC2=4013 IC3=4047 CR1=3. 2768 MHZ crystal. This is a ultrasonic motion detector (or movement detector) circuit. The circuit claimed has a high movement sensitivity. Even air moving (hot air rising, wind blowing) will trigger it when the trimpot is set near the most sensitive position. The transmitter sends out a steady ultrasonic tone at 40kHz. At this frequency the wavelength is. This is a simple audio Pre-Amplifier with single transistor 2N3904. This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that`s very sensitive to sound. 🔗 External reference