Schematic & Wiring Diagram

A 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.

Here 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

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.

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.

Its 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

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.

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

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.

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.

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.

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.

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.

This 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

This 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.

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.

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 

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.

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:

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.