Electronic Design: Monostable Latch Circuit using 555-Timer

555 Circuit. - This is one of implementation of 555 IC to build monostable latch. It is only need small component to build this electronic circuit that basically using 555 and other component.

The electronic design circuit of Monostable Latch using 555-Timer is look like in Figure 1 below. Other component used like LED, resistors, capacitors, and push-button switch.

Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.

Electronic Circuit Design

Figure 1. Electronic Design: Monostable Latch Circuit using 555-Timer (Source: Circuitstoday.com)

Component Parts

• IC 555
• Resistors
• Capacitors
• Push-button switch
• Diode LED

Description

The electronic circuit design like in Figure 1 above show you monostable latch circuit using 555 Timer. Other component need also that can supply with low voltage DC +12V source to charge this IC and all system component. With this electronic design circuit you can produce monostable latch that useful now.

According Circuitstoday blog mentioned that using the charging and discharging phases of RC-Circuit as a continuous voltage signal, timing circuits can be designed. When the voltage at trigger input falls from Vcc to below 1/3 Vcc the LC (Lower Comparator) sets and this, in turn, sets the RS-Latch and hence, the output is set. The voltage across the capacitor is connected to the Non-Inverting terminal of the UC (Upper Comparator) and is compared with pre-set 2/3 Vcc at the inverting terminal of the Op-Amp. When the capacitor voltage tends to exceed 2/3 Vcc, the UC sets and this, in turn, resets the RS-Latch and hence, the output is reset.

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Electronic Design: Microprocessor Circuit Based Security System

Security Circuit. - This is one of implementation of microcontroller to buld security system that very useful advance world security system is in high end so the security breakers are. The main microcontroller used in this circuit is 8051 that very popular in electronic design.

The electronic design circuit of microcontroller based on security system is look like in Figure 1 below. Other component used like resistors, capacitors, transformer, relay, diodes, transistor, NE555 IC and also other component that you can look in components part below.

Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.

Electronic Circuit Design

Figure 1. Electronic Design: Microprocessor Circuit Based Security System (source: Electronicsproject.org)

Component Parts

• R1, R2 = 5.6 KΩ
• R3, R16, R18 – R22, R25 = 4.7 KΩ
• R4 = 100 Ω
• R5 = 3.9 KΩ
• R6, R8, R12, R15, R17 = 1 KΩ
• R7, R10, R11, R13, R14 = 10 KΩ
• R9 = 100 KΩ
• R23 = 120 Ω
• R24 = 470 Ω
• VR1 = 47 KΩ
• VR2 = 10 KΩ
• C1 = 3.3 nF ceramic disc
• C2, C6, C13, C14 = 0.1 µF ceramic disc
• C3, C8 = 0.01 µF ceramic disc
• C4 = 1 nF ceramic disc
• C5 = 10 µF, 25V electrolyte
• C7 = 2.2 µF, 25V electrolyte
• C9 = 10 µF, 10V electrolyte
• C10, C11 = 10 pF ceramic disc
• C12 = 1000 µF, 50V electrolyte
• IC1 = NE555 (timer IC)
• IC2 = µA741 (operational amplifier)
• IC3 = LM567 (Phase-Locked-loop)
• IC4 = 8085 (Microprocessor)
• IC5 = 2732A (EPROM 4k)
• IC6 = 64LS373 (Octal Transparent Latch)
• IC7 = 8255 (programmable peripheral interface)
• IC8, IC9 = MCT2E optocoupler
• IC10 = 74LS00 (NAND gate)
• IC11 = 7809 (9V regulator)
• IC12 = 7812 (12V regulator)
• T1, T3 – T9 = BC548 (NPN transistor)
• T2 = L14G1 (Phototransistor)
• D1 = 1N4148 (Switching diode)
• D2 – D10 = 1N4007 (rectifier diode)
• LED1 – LED3 = Red LED
• IR LED1 = Infrared Led
• X1 = 230V/50 Hz or 110V/60 Hz AC primary to 12V-0-12V, 300 mA secondary transformer
• XTAL = 3.5 MHz crystal
• SW1 = Push-to-on switch
• SW2 = On Off switch
• RL1, RL2, RL4, RL5 = 12V, 200 Ω, 1C/O relay
• RL3 = 12V, 200 Ω, 2C/O relay

Description

The electronic circuit design like in Figure 1 above show you microcontroller based security system. Other component need also that can supply with low voltage DC +5V source to charge this transistor and all system component from power supply built. With this electronic design circuit you can produce security system that useful now.

According ElectronicsProject blog mentioned that the transmitter section is designed and fabricate around timer IC NE555 wired as astable multivibrator followed by transistor T1 and IR LED. The oscillated frequency of transmitter section is decided by resistor R1 and R2, preset VR1 with capacitor C1. The output from pin 3 of IC1 is given to base of transistor T1 through resistor R3 for amplification as per required and given to IR LED. The modulated IR signal is transmitted by IR LED1.

The IR transmitted signal is focused on the base of photo transistor. The output from photo transistor is given to transistor T3 followed by op-amp (IC2) for amplification. The amplified signal from IC3 is given to input pin 3 of Phase-Locked-Loop (PLL) IC LM567 (IC3) through capacitor C4. The normal use of PLL IC (IC3) is frequency decoder so is here in order to drive the load. The tuning frequency is determined by variable resistor VR2 and current controlled oscillator by resistor R12. The tuning frequency (6-10 KHz) should match with modulating frequency transmitted by transmitter. Pin 8 of IC3 is connected to base of transistor T4 through resistor R13. Glowing LED1 indicate receiving signal is locked to transmitting signal. Transistor T5 is used as relay driver in order to energize the relay RL5. Relay RL1 energized normally when transmitted IR signal falls on phototransistor T2, at this time microprocessor does not get any input. But when IR signal is interrupted microprocessor get high (TTL-level) signal through port A of Programmable Peripheral Interface (PPI).

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Electronic Design: Power Supply Resumption Alarm using 555 IC

Power Supply Circuit. - This is one of implementation of 555 IC to build power supply resumption alarm that very useful when power is fail in some place like factories, industries, auditoriums, and theatres etc. It is only need small component to build this electronic circuit that basically using 555 IC and other component.

The electronic design circuit of power supply resumption alarm using 555 IC is look like in Figure 1 below. Other component used like resistors, capacitors, transformer, relay, diodes, transistor and also buzzer to sound this alarm.

Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.

Electronic Circuit Design

Figure 1. Electronic Design: Power Supply Resumption Alarm using 555 IC (source: Electronicsproject.org)

Component Parts

• R1, R2 = 10 KΩ
• R3 = 470 Ω
• VR1 = 1 MΩ (DELAY ADJ.)
• C1 = 1000 µF/25V
• C2 = 100 µF/25V
• C3 = 1 µF/25V
• C4 = 0.01 µF
• IC1 = NE555
• T1 = SL100
• D1 – D3 = 1N4001
• X1 = 12V – 0 – 12V 500 mA secondary
• F1 = Fuse
• RL1 = 12V, 400Ω relay
• 230V buzzer

Description

The electronic circuit design like in Figure 1 above show you power supply resumption alarm circuit using 555 IC. Other component need also that can supply with low voltage DC 12V source to charge this transistor and all system component from power supply built. With this electronic design circuit you can produce power supply resumption alarm that useful now.

According ElectronicsProject blog mentioned that the circuit is built around IC555 wired in monistable mode. The surge when power resumes triggers the monostable which switches transistor SL100 on. The relay energized and the bell or buzzer connected to N/O contacts of the relay operates. The preset time depends upon VR1 and C2. The Capacitor C3 connected to pin 2 of 555 should have low leakage.

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Electronic Design: Sensitive Optical Burglar Alarm Circuit using NE555 IC

Alarm Circuit. - This is the other electronic design circuit for implementating of NE555 IC in this time for you. This electronic design circuit mentioned with sensitive optical brglar alarm based on NE555 IC as the major component used.

The electronic design circuit of sensitive optical burglar alarm circuit look like shown in Figure 1 below. From the circuit shown, that there many other major component used like transistor, led, resistors, and capacitor.

Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.

Electronic Circuit Design

Figure 1. Electronic Design: Sensitive Optical Burglar Alarm Circuit using NE555 IC (Source: Electronicprojects.org)

Component Parts

• R1, R5 = 1 KΩ
• R2 = 100 KΩ
• R3 = 4.7 KΩ
• R4 = 10 KΩ
• VR1 = 1 MΩ
• VR2 = 100 KΩ
• C1 = 1 µF/16V
• C2 = 0.01 µF
• C3 = 0.047 µF
• C4 = 0.01 µF
• C5 = 47 µF/25V
• IC1, IC2 = NE555
• T1 = 2N5777 Photo Transistor
• T2 = BC547
• LED1 = RED LED
• LS1 = 8Ω / 0.5W

Description

The electronic circuit design like in Figure 1 above show you sensitive optical burglar alarm circuit using NE555 IC. Other component need also that can supply with low voltage DC 12V source to charge this IC and all system component. With this electronic design circuit you can produce alarm for security system that useful now.

According ElectronicProjects blog mentioned that this optical burglar alarm uses two 555 timer ICs (IC1 and IC2). Both the ICs are wired as astable multivibrators. The first astable multivibrator built around IC1 produces low frequencies, while the second astable multivibrator built around IC2 produces audio frequencies.

General-purpose Darlington photo-transistor T1 is used as the light sensor. To increase the sensitivity of the circuit, NPN transistor T2 is used.

Place phototransistor T1 where light falls on it continuously. Phototransistor T1 receives light to provide base voltage to transistor T2. As a result, transistor T2 conduct to keep reset pin 4 of IC1 at low level. This disables the first multivibrator (IC1) and hence the second multivibrator (IC2) also remains reset so the alarm (LS1) does not sound.

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Electronic Design: Car Parking Guard Circuit using Infrared Sensor and 555 IC

Alarm Circuit. - This is one of the application of infra red sensor and 555 IC to build very useful circuit that called with car parking guard. Beside two component mentioned above, there are also any other component like LM567 and photo darlington transistor.

So, the electronic design circuit of car parking guard look like shown in Figure 1 below. From this Figure that it is show you the car parking circuit using pasive component like resistor and capacitor that easy to buy in this market.

Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.

Electronic Circuit Design

Figure 1. Electronic Design: Car Parking Guard Circuit using Infrared Sensor and 555 IC (Source: Electronics-hub.com)

Component Parts

• Infra red sensor
• NE555 IC
• LM567 IC
• Photo darlington transistor
• Resistors
• Capacitors

Description

The electronic circuit design like in Figure 1 above show you car parking guard using infra red sensor and 555 IC. In here we can use low voltage DC 12V source to charge this IC and all system. With this electronic design circuit you can produce car parking guard that useful now.

According Electronics-hub blog mentioned that The reverse indicator light supply is given to the 7805 regulator to give 5v to the rest of the circuit. The diode D6 is used to eliminate the reverse current and wrong supply polarity.

When the car is driving in reverse the car battery will provide DC supply the reverse light indicator at the back of the car when this supply came to the reverse light indicator the circuit will have the power supply.7805 will regulate the DC voltage to 5V and give to the IR Sensors through the transistor with 20 KHz modulating frequency of the LM567 (TONE DETECTOR) available at Pin5. The resistor R1 will resists the IR senor current. At this point the pin8 of LM567 is high which will enable the LM555 timer operating in astable multivibrator mode. The output of the timer is enabled which can be assured by the LED (blinking) and also buzzer will beeps at determined rate given by the resistors R6, R7 and capacitor C7. The timer output also is given to the lamp through a transistor. The lamp will blink as a warning signal because of the PWM signal generated by the timer, transistor will work as a switch and resistor R10 will limit the current. This condition is maintained until the 20 KHz signal is received by the pin3 of the LM567.

The above condition is when there is no obstacle in the path of the car while taking reverse. If there is a obstacle the IR beam will radiate back to the IR sensor and the 20KHz modulated signal is given to the pin3 of LM567 through photo Darlington transistor, at this point the pin8 of the LM567 is turned to low and also gets locked to detect the 20Khz signal. By this the LM555 is turned low and disabled by this the led will remain lighting and buzzer makes the continuous sound to alert the driver.

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Electronic Design: Sine Wave Converter Circuit using NE555 IC

Wave Generator Circuit. - There are many electronic circuit designed to build wave generator or converter. This is aim to result many kinds wave source like sine, pulse, and square. One pupular wave in electronic design is sine wave for many application. So, in here we will present you one electronic circuit design to result sine wave using popular component that called with 555 IC.

Beside we will show you electronic design circuit and component parts need, we also will give you global description about this circuit. So, please enjoy to continue reading this article until finish and get more useful.

Electronic Circuit Design

Figure 1. Sine Wave Converter Circuit using NE555 IC (Source: ElectronicsProjectDesign)

Component Parts

• R1, R2 110K ohm 5% 1/4W Carbon Film Resistor
• R3 4.7K ohm 5% 1/4W Carbon Film Resistor
• C1 0.01uF/25V Ceramic Capacitor
• E1 1uF/25V Electrolytic Capacitor
• U1 555 Timer IC

Description

The electronic circuit design like in Figure 1 above show you sine wave converter circuit using the major component called with NE555 IC. In here we can use 12V source to charge this IC. The timer of 555 IC is configured as a Schmitt trigger principle. To result output square wave, it is do by applying the input sine wave signal with connecting trigger input pin 2 and threshold input pin 6 of the timer together.

According ElectronicsProjectDesign blog mentioned that this circuit is achieved because once the input signal is above 2/3 X 12V = 8V DC, the output 3 voltage will become low (< 1V DC). The output voltage will remain low until the input signal go down to below 1/3 X 12V = 4V DC. When this threshold is achieved, the output will go high (>10V DC).

It will remain high until the input signal voltage level reaches 8V when it will switch back to low. This type of switching continues on hence by applying a sine wave input, you will get a square wave output. 

The difference of voltage 8V-4V is 4V which is the hysteresis. This hysteresis value is necessary to ensure proper signal conditioning in the presence of electrical noises in the circuit. The capacitor E1 is used to remove the DC component of the input signal that may be present. Resistors R1 and R2 are used as voltage divider to divide the quiescent voltage of 6V.

There are many instances where you will need to convert a sine wave signal to square wave signal as many input ports of semiconductor devices are triggered by rising or falling of clock signal.

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