Saturday, August 27, 2011

5V Boost Converter using LTC3440

5V Boost Converter using LTC3440A simple 5V boost converter using LTC3440 shown here. LTC3440 is a high efficiency DC to DC converter that can be operated from input voltages below, above or equal to the output voltage. As for the synchronous rectification, LTC3440 delivers up to 96% efficiency and up to 600 mA output current is guaranteed. The IC has built an oscillator whose frequency synchronized whose frequency can be adjusted from 300 kHz to 2 MHz



The LTC3440 circuit is connected as a boost converter capable of delivering 5V output 5V @ 300mA constant input voltage of 2.7 to 4.2 V. The resistor R4 is used to set the oscillator frequency, while the resistors R1 and R2 are used to adjust the output to 5 volts. Resistance R3 and capacitor C1 form a frequency compensation network, while C3 serves as an input bypass capacitor. S1 is the stop switch and capacitor C2 is the output filter.

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Metronome Generator Circuit using NE555

Metronome Generator Circuit using NE555Here is a simple circuit with NE555 IC that can be used to generate metronomes.Such circuit is very useful for those who learn music. The circuit is simply an astable multivibrator NE555 cable around. The components R1, R2 and C1 determine the frequency

Notes.

  • The circuit can be wired on a general purpose PCB or common board.
  • The circuit can be powered from a 9V PP3 battery.
  • The POT R1 can be used to adjust the rhythm of the sound.
  • The POT R2 can be used as volume control.
  • The speaker k1 can be a n 8 Ohm tweeter.
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Thursday, August 25, 2011

Static 0 to 9 Display using SN7446 and 7490

Static 0 to 9 Display using SN7446 and 7490

The circuit shown here is a simple Static 0-9 Display can be used in many applications. The circuit is based on 7490 asynchronous decade counter (IC2), a 7-segment display (D1), and a seven-segment decoder / driver IC 7446 (IC1).



The seven-segment display consists of 7 LEDs as 'a' to 'g'. For different LEDs bias, we can show the digits 0 to 9. Seven Segment Displays are of two types, the common cathode and common anode. Like the type of anode anodes of all seven LEDs are attached, while the type common cathode cathodes are all together. The seven-segment display used here is a type common anode. The resistance R1 to R7 are current limiting resistors. IC 7446 is a decoder / driver IC that is used to control the seven segment display.



Work of this circuit is very simple. For each clock pulse output of IC2 BCD (7490) advances a bit. The IC1 (7446) decodes the BCD output for the form of seven segments and controlling the display to indicate the corresponding digit.
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6V Gel Cell Charger Circuit

6V Gel Cell Charger Circuit diagram




This is the diagram of 6V Gel Cell charger. The circuit is using NE555 timer as oscillator and TPI31T switching transistor. The schematic diagram designed by Tony Van Roon.



Parts List:

R1 = 22 ohm, 1W

R2 = 270 ohm

R3 = 220 ohm

*R4 = 715 ohm, 1%

*R5 = 3.57K, 1%

*R6 = 1.40K, 1%

*R7 = 1.47K, 1%
C1 = 100nF

C2 = 100nF

D1 = 1N4001

T1 = TIP31A, B, C (or equivalent)

U1 = Timer IC NE555V (or equivalent)

S1 = Toggle switch, ON-OFF
* Resistors type are carbon, 1/4 watt, 5% tolerance, unless otherwise indicated.



6V Gel Cell Charger circuit source page
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Sunday, August 21, 2011

Lamp Flasher using IC LM395

Lamp Flasher using IC LM395

This circuit of powerful flashing lamp is good use in vehicles. The LM395 IC based on circuit also known as super-transistor, which is terribly powerful integrated monolithic power transistor with options such as thermal protection, current limit etc. In fact, this circuit is almost indestructible.The IC will handle currents up to 1A 40V and switch in less than 500 nanoseconds. Resistor R1 and capacitor C1 determine the frequency of blinking. With the flash rate indicates the value is approximately 1 flash per second.

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Saturday, August 20, 2011

Simple Circuit 12V to 120V DC DC Converter

Simple Circuit 12V to 120V DC DC ConverterIts a simple circuit of 12V DC to 120V DC converter. The circuit consists of two phases first phase of the investor base and then a rectifier and filter stage. IC1 NE555 is wired as an astable multivibrator operating at a frequency of 100 Hz and can be adjusted to the preset R1. IC1 output is coupled to the clock input of IC2 is a dual CMOS D flip-flop. IC2 divides the pulse train of 100 Hz IC1 2 50 Hz pulse trains that are 180 degrees out of the party and offered on the pin 1 and 2 of IC2.



When pin 1 is high transistor Q1 conducts and current flows through the upper half of T1 primary winding. When pin 2 is the transistor Q2 conducts and high current flows through the lower half of the primary coil T1. As a result of a voltage of 120 V AC are induced in the secondary of T1. This voltage is rectified with bridge D1 to provide a 120V DC output. Capacitor C2 is the DC input filter, while C3, C4 are the output filters.



Notes.
  • The circuit can be assembled on a vero board.
  • Q1 and Q2 require heat sink.
  • Output power of this dc dc converter is around 100 watts.
  • IC1 and IC2 are to be mounted on holders.
  • An optional 5A fuse can be added in series to the 12V supply line.
  • T1 can be a 9-0-9V /250V/3A mains transformer.
  • If 3A bridge is not available make one using 1N5408 diodes.
  • Out of the two Flip-Flops inside CD4013 only one is used here.
  • Output of IC1 must be set to 100Hz by adjusting preset R1
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Thursday, August 18, 2011

DC Motor Controller Circuit with NE555

DC Motor Controller Circuit with NE555

A simple DC motor controller circuit with NE555 is shown here. several DC motor speed control circuits are revealed here however this can be the first one using NE555 timer IC. additionally to controlling the motors speed its direction of rotation will be also modified using this circuit.



A PWM circuit primarily based on timer NE555 is that the heart of this circuit. NE555 is wired as an astable multivibrator whose duty cycle will be adjusted by varying the POT R1. The output of IC1 is coupled to the base of transistor Q1 that drives the motor according to the PWM signal available at its base. Higher the duty cycle the typical voltage across motor will be high which ends in higher motor speed and vice versa. modification of DC motor direction is attained using the DPDT switch S1 that on application simply toggles the polarity applied to the motor.

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6-8A / 0-28V Variable Power Supply Circuit

6-8A / 0-28V Variable Power Supply Circuit



This is the schematic diagram of variable power supply. The output voltage of this power supply circuit can be adjust from 0V to 28V DC, while the current output is static the rang is about 6A up to 8A.



Parts List:

R1 = 2K2 Ohm 2,5 Watt

R2 = 240 Ohm

R3,R4 = 0.1 Ohm 10 Watt

R7 = 6K8 Ohm

R8 = 10K Ohm

R9 = 47 Ohm 0.5 Watt

R10 = 8K2 Ohm

C1, C7, C9 = 47nF

C2 = 4700uF/50v – 6800uF/50v

C3, C5 = 10uF/50v

C4, C6 = 100nF

C8 = 330uF/50v

C10 = 1uF/16v

C11 = 22nF
D1…D4 = four MR750 diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 diodes.

D5 = 1N4148, 1N4448, 1N4151

D6 = 1N4001

D10 = 1N5401

D11 = LED

D7, D8, D9 = 1N4001

TR = 2 x 15 volt (30volt total) 6+- Ampere

IC1 = LM317

T1, T2 = 2N3055

P1 = 5k

P2 = 47 Ohm or 220 Ohm 1 Watt

P3 = 10k trimmer pot

F1 = 1 Amp

F2 = 10 amp




Source: schematicdiagram.s4s.in

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Monday, August 15, 2011

Doorbell circuit using NE555 IC

Doorbell circuit using NE555 IC

The main part of this circuit Doorbell two timer NE555 ICs.When someone hit the switch S1 momentarily, the speaker emits a sound of the bell, if the time period of the monostable multivibrator built around IC1.



When the switch S1 pressed, IC1 is enabled in your pin 2 and pin 3 output is high for a period of time previously set by the values ​​of R4 and POT POT R5.When ofIC1 restores the IC2 output is high and starts to swing to make a bell sound through the speaker.The IC2 is configured as an astable multivibrator whose oscillation frequency can be varied with the help of POT R5.By adjusting the values ​​of R4 and R5, changes in tone are possible

Notes.

  • The circuit has to assembled on a good quality PCB or common board.
  • The IC1 & IC2 has to be mounted on IC holders.
  • Power the circuit from a 9V battery or 9V DC power supply.
  • Switch S1 is push button switch.
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Class B audio amplifier based on TDA1553

Class B audio amplifier based on TDA1553

Here is the circuit of a Class B audio amplifier based on TDA1553. TDA1553 is a monolithic audio amplifier class B, containing 2 x 22 watt amplifier in bridge configuration load attached. The amplifier operates from 12V DC and develops intentionaly for car audio applications. The IC also has a lot of good features such as short circuit protection, protection of the load dump, reverse polarity protection, speaker protection, etc.



In the circuit, C5 and C4 are decoupling capacitors C3 input, while setting the delay for speaker protection. C1 and C2 are filter capacitors of the offer.



Notes :

  • Assemble the circuit on a good quality PCB.
  • Use 12V DC for powering the circuit.
  • The circuit can deliver 22W per channel into 4 ohm speakers.
  • Fit the IC with a proper heat sink.
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Saturday, August 13, 2011

Electronic Siren Circuit

Electronic Siren circuit diagram



This is the schematic diagram of electronic siren circuit. The sound produced imitates the rise and fall of an American police siren. When very first switched on, the 10uF capacitors is discharged and each transistors are off. When the push button switch is pressed to 10uF capacitor will charge via the 22k resistor. This voltage is applied towards the base of the BC108B which will turn on slowly. When the switch is released the capacitor will discharge via the 100k and 47k base resistors and also the transistor will slowly turn off. The change in voltage alters the frequency of the electronic siren.



Electric current drain is fairly high in this electronic siren circuit so a appropriate power supply is needed. The duration the tone takes to rise and fall is determined by the 10uF and 22k resistor. These values may possibly be varied for various effects.
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Thursday, August 11, 2011

6Watt Hi Fi Audio Amplifier using TDA 2613

6Watt Hi Fi  Audio Amplifier using TDA 2613

A 6 watt Hi Fi Audio amplifier TDA2613 . TDA2613 is an integrated hi-fi amplifier IC from Philips Semiconductors. HF is on / off test, click, short-circuit proof, thermal protection and is offered in 9-pin single in line package of plastic.



In the given circuit, TDA2613 connected to the control of a supply. Capacitor C4 is the DC input, while decoupler capacitors C5, C6 are the filters of the power supply. Audio is fed to the non-inverting input through capacitor C4. Inverting input and Vp / 2 pins of the IC are connected along and grounded through capacitor C3. Capacitor C2 couples the speaker to the output of integrated circuits and the network comprising capacitor C1 and resistor R1 improved high frequency stability.

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Digital Volume Control Circuit using MAX5486

Digital Volume Control based IC MAX5486A channel digital volume circuit on IC MAX5486 is shown here. MAX5486 40K digital volume / balance controller that pushbutton interface. The IC bias voltage that eliminated of an external circuitry for purpose and thereby by reduces external count. The IC has an LED indicator driver circuit be used for driving the indicator LEDs indicates level and balance level. The IC operated from or power and in pin TSSOP package. circuit on MAX5486 applied applications like personal audio systems, audio devices, home theatre systems, audio systems, audio systems etc.

The right channel input is applied to the pin8 (high terminal (HR) of internal digital potentiometer of the IC) and left channel input is applied to the pin17 (high terminal (HL) of the second internal digital potentiometer of the IC). Low terminals (pin and 6) of potentiometers are shorted and connected to the mid bias voltage output (pin11) of the IC. at the buffered wiper terminal (pin10) of internal potentiometer and left channel output at the buffered wiper terminal of the second internal potentiometer of the IC. A 1uF capacitor is connected from the bias generator bypass (pin12) to ground. of this capacitor is noise bypassing. of capacitors C4 and C5 are to bypass noise from the VDD and VLOGIC sources. This improves stability and performance of the circuit.

LEDs D1 to D5 are the indicator LEDs indicates volume and balance levels. R1 to R5 limits current through the corresponding LEDs. 1M resistor R6 for activating the indicator LED drivers. LED D6 represents operation mode of IC. When it glows, the IC is in balance mode and when off, the IC in volume mode. Resistor R7 limits through LED D6. volume mode the LEDs work a bar graph indicating volume. balance mode, the centremost LED alone glows when a centred balance. mute mode, all indicator LEDs OFF.

Push button switches S1 to S4 are used for controlling the circuit. Pressing S1 push the IC into mute mode. Push button S4 used between volume mode and balance mode and LED D6 indicated it. Push button S2 and S3 are used for increasing and decreasing volume mode and shifting the balance to left and right balance mode. The Vss pin of the IC is grounded single operation circuit. Shutdown pin (pin6) is tied to the VLOGIC for disabling the shutdown . Connecting the shutdown pin to drive the IC to the shutdown mode.

The output of the MAX5486 is sufficient enough to drive high impedance headphones. For driving low impedance headphones or speakers an amplifier stage be added to the output. power dissipation of MAX5486 is 675mW and consider this point while selecting the loads.
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Tuesday, August 9, 2011

Simple Electronic Thermostat using IC LM56

Simple Electronic Thermostat using IC LM56

Here a schematic of a really simple electronic thermostat using IC LM56. LM56 is a terribly correct twin output low power thermostat from National Semiconductors.LM56 has varied helpful options like internal temperature sensor, 2 internal voltage comparators, internal voltage reference etc. 2 stable temperature trip points (VT1 and VT2) are created by dividing the LM56′s 1.250V internal voltage reference using 3 external resistors (R1, R2 and R3). There are 2 digital outputs for LM56 .Output1 becomes LOW when the temperature will increase higher than T1 and goes HIGH when the temperature decreases below (T1±Hysteresis Temperature). within the same method, Output2 becomes low when the temperature goes on top of T2 and goes HIGH when the temperature goes below (T2±Hysteresis Temperature).

By connecting a cooler because the load for relay L1 and a heater as the load for relay L2, a really easy and helpful temperature control system will be created.

  • The circuit can be assembled on a Vero board.
  • Use 5V DC for powering the circuit.
  • L1 and L2 can be 5V relays.Their current ratings must be selected according to the load they switch.
  • Do not give more than 10V to LM56.
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Car audio amplifier using TDA2003 IC

Car audio amplifier using TDA2003 IC

Easy low power car audio amplifier circuit on TDA 2003. The circuit is Easy to construct. TDA2003 is an integrated radio amplifier from ST Micro electronics that like short circuit protection for all pins, thermal over low harmonic distortion, low cross over distortion etc. In the circuit given here TDA2003 is wired as a mono amplifier operating from a 12V .



Resistors R2 and R3 forms a feedback network that sets the amplifiers gain. C7 input DC de-coupling capacitor and C5 couples the speaker to the amplifiers output. C4 } for improving the ripple rejection C1 and C2 are employed for power filtering. C3 and R1 are used for setting the frequency cut-off. Network comprising of C6 and R4 for frequency stabilization and oscillation.

Notes.

  • Assemble the circuit on a good quality PCB.
  • Heat sinks are necessary for both ICs.
  • The circuit can be operated from 12V DC.
  • S1 is the ON/OFF switch.
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Sunday, August 7, 2011

Cable TV amplifier Using 2 Transistor

Cable TV amplifier Using 2 Transistor
This is cable TV amplifier using 2 transistors. This amplifier circuit is for cable TV systems using Ohm coaxial cables and works fine up to 150MHz. Transistor T1 performs of amplification. Up to 20dB gain expected from the circuit.T2 is wired as an emitter follower current gain.

  • assembled on a Vero board
  • Use 12V DC for powering the circuit.
  • Type no of the transistors are not very critical.
  • Any medium power NPN RF transistors can be used in place of T1 and T2.
  • This is just an elementary circuit. Do not compare it with high quality Cable TV amplifiers available in the market.


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    TDA2006 - 12W Audio Amplifier Circuit

    TDA2006 - 12W Audio Amplifier CircuitThis 12w amplifier circuit is build round the TDA2006 integrated circuit who options a brief circuit protection system, and a thermal shutdown system in case of overheating. With a 12v power supply the circuit delivers 12w on a 4 ohm speaker and 8w on a 8 ohm speaker. The integrated circuit will work with a power supplyr between 6v and 15v max.



    The TDA2006 is monolithic integrated circuit in package, {supposed to be used as a low frequency category "AB" amplifier. At ±12V, d = 10 and frequently it provides 12W output power on a 4Ω load and 8W on a 8Ω . The TDA2006 provides high output current and has terribly low harmonic and cross-over distortion. any the device incorporates an inspired (and patented) short circuit protection system comprising a rendezvous for automatically limiting the dissipated power therefore on keep the operating urpose of the output transistors at intervals their safe operating space. a standard thermal shutdown system is additionally included. The TDA2006 is pin to pin equivalent to the TDA2030

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    Thursday, August 4, 2011

    6 Graphic Equaliser Circuit 741 Op-Amp

    6 Graphic Equaliser Circuit 741 Op-AmpThis circuit is half dozen Band Graphic Equaliser ,you can modify sound in low ,mid and high that circuit used IC 741 Op-Amp. With this circuit you can management and mix frequencies and tones as desired.

    Essentially, the circuit consists of an IC 741 whose gain at various freguencies is set by corresponding potentiometer setting.

    The audiblefrequency spectrum is roofed in six steps: 50Hz, 160Hz, 500Hz, 1.6kHz, 5kHz, 16kHz. All potentiometers are of 100kΩ linear kind. The circuit provides adequate boost / cut for traditional use.

    power provide for the circuit may be derived from the amplifier / preamplifier itself. The wide rangeof provide voltage (6V-20V) makes the circuit terribly versatile. Power consumption is negligible.

    6 Graphic Equaliser Circuit 741 Op-Amp list Component
    R1,R2,R3,R4,R5,R6 : 27kΩ     C1: 100n      C6: 300pF
    R7: 470kΩ C2: 33n C7: 100uF/16V
    R8: 330kΩ C3: 10n C8: 4.7uF/16V
    R9: 100kΩ C4: 3.3n C9: 47uF/16V
    R10: 4.7kΩ C5: 1n IC1: 741 Op amp
    R11: 4.7kΩ
    VR1,VR2,VR3,VR4,VR5,VR6: 100kΩ Linear Potentiometers
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    Wednesday, August 3, 2011

    30W Class AB Amplifier Circuit With TIP3055/TIP2955

    30W Class AB Amplifier Circuit With TIP3055/TIP2955
    This amplifier has been simulated extensively, although i haven't built it nonetheless. i'm saving circuit this one for a time after I will spend smart time building and making sure the wiring goes to be optimal. i'm attending to use this amp in a bi-amp scenario with passive filters on the input. this may result in 2 amplifiers that amplify the highs and 2 amplifying the lows (for stereo) and therefore I can do an effective power of 120W into each speaker.

    To set the on top of amplifier up, set R1 to max and R12 to 0. once doing this successfully, power on the amplifier. Set R1 in order that the measured output offset is between thirty and 100mV. Once set, modify R12 slowly to attain a quiescent current of around 120mA. Keep checking the quiescent current as the amp heats up because it would possibly modification owing to voltage drop changes in the output devices caused by heat. The heatsinks ought to be 0.6K/W or less for two amplifiers.
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    Tuesday, August 2, 2011

    AT89S51 Microcontroller based on Digital Clock

    AT89S51 Microcontroller based on Digital Clock
    Digital hours to create this not too tough. This series is not my original project, I trace the series of files and program from the internet, there is no chance the program listing. when I download the file to its hex-hour direct approach. This clock only displays hours and minutes, to seconds but you'll install the led associated with a series of I Hz oscillator formed from IC 555 (which I do, because I do not recognize the program listing).

    a pair of led in parallel and installed as a bookmark seconds. Led to two installed in the middle of the hours and minutes. though with the approach that seconds and minutes if observed (calculated) decline slightly however i am not the problem, Moreover individuals won't understand it.
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    Simple LM358 Mic Preamplifier

    Simple LM358 Mic Preamplifier


    This is a simple LM358 microphone preamplifier schematic diagram. The pre-amp circuit is very easy to build and.. it's a low cost project... The variable resistor R5 is to adjust the LM358 op-amp gain. The LM358 has dual op-amp circuit modules, you may use a single LM358 to build two channels mic preamplifier.

    Parts List:
    R1, R3, R4 = 10K
    R2 = 1K
    R5 = 100K-1M Potensiometer
    C1 = 0.1uF
    C2 = 4.7uF/16V
    IC1 = LM358 dual op-amp single power supply
    Mic = Electret Microphone
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    Monday, August 1, 2011

    Pre-Amp Condenser Microphone Circuit

    Pre-Amp Condenser Microphone Circuit
    Pre-Amp Condenser Microphone Circuit is straightforward, consisting of two levels. with wide dynamic regions, small noise, and can with an extended cable regarding 50 meters.

    Note:
    all capacitor (elco) using 25-volt
    to avoid the buzzing sound, use a good regulator supplay
    This circuit can provide voltage 6-20volt

    This circuit uses low noise transistors are kind types: BC 650 C but the transistor is hard to search out, so you'll replace it with 109 BC is not any less sensible. This condenser mic component in it's a really sensitive microphone, and to use this mic condenser needed voltage between 2-10 volts, for that we are able to resistors in series with 1K-10 K ohms, within the picture above the tide 1k ohms.

    Pre-Amp Condenser Microphone CircuitPin BC109
    1. Emitter
    2. Base
    3. ollector, connected to the case

    BC109 limiting values

    collector-base voltage 30 V
    collector-emitter voltage 20 V
    emitter-base voltage 5 V
    collector current (DC) 100 mA
    peak collector current 200 mA
    peak base current 200 mA
    total power dissipation Tamb £ 25 °C - 300 mW
    storage temperature 65 +150 °C
    junction temperature 175 °C
    operating ambient temperature -65 +150 °C
    DC current gain (hFE) IC = 10 mA; VCE = 5 V 100 -- 270
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