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A very simple LED driver electronic project can be designed using the CAT3649 high efficiency quad mode R fractional charge pump IC that can drive up to six LEDs. The inclusion of a 1.33x fractional charge pump mode increases the device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors.Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi−fractional charge pump supports a wide range of input voltages from 2.4 V to 5.5 V. The LED current can be adjusted in different ways. The full−scale LED current is set to 25 mA once the device is enabled. Analog dimming in 32 linear steps is achieved via a 1−wire pulse−dimming input (ADIM) Further adjustment of the LED current can be done by applying a pulse width modulation (PWM) signal on the PWM input.The CAT3649 can be shut down by holding the ADIM or PWM input in a logic low condition for greater than 30 ms....

A 6 watt audio amplifier circuit using TDA2613 is shown here. TDA2613 is an integrated Hi-Fi  audio amplifier IC from Philips Semiconductors. The IC is switch ON / switch OFF click proof, short circuit proof, thermally protected and is available in 9 pin single in line plastic package. In the given circuit, TDA2613 is wired to operate from a single supply. Capacitor C4 is the input DC decoupler while capacitors C5, C6 are power supply filters. Input audio is fed to the non inverting input through capacitor C4. Inverting input and Vp/2 pins of the IC are tied together and connected to ground through capacitor C3. Capacitor C2 couples the speaker to the ICs output and the network comprising of capacitor C1 and resistor R1 improves the high frequency stability. Circuit diagram Notes. Assemble the circuit on good quality PCB. Supply voltage (Vs) can be anything between 15 to 24V DC. Heat sink is necessary for TDA2613. Do not give more than 24V to TDA2613.

This is a newer version of previous device. This one can have up to 6 relays and 6 sensor-state inputs. The task was to build a device that connects to the phone line and has a relay as an output switch. It should also sense if the connected  «consumer» is turned-on or off and report to the administrator at the other end of the phone line. The administrator would then call-in the device, log in with the password, and check the state of  «consumer», turn it on or off, change password or some other settings. Download : Schematic, Program files And Documentation Schematic: Full Schematic Telephone operated remote control

It is very low-cost and simple electronic circuit project for temperature controller using the LM3911 highly accurate temperature measurement and control system designed in a single monolithic chip. The output voltage of the LM3911 is directly proportional to temperature in degrees Kelvin at 10 mV/degree K. As you can see in this circuit diagram, LM3911 temperature sensor chip require few additional components. Temperature Controller Circuit Diagram:   The resistor network consists of R1, R2, and R3 is used to provide the set point voltage reference for the feedback input of the LM3911. R4 resistor is used to limit the current through the internal voltage reference of the LM3911. R5 resistor pulls the output of the IC high when the temperature is bellow the set point. The internal resistor is in series with a diode that allows a switching voltage up to 35 volts to be used. By modifying the R2 variable potentiometer you will modify the set point of the temperature controller. This s...

Here is a circuit 120 watt stereo amplifier using STK4241V . The MAX9710 a stereo audio power amplifier capable of delivering 2 x 120 W of the IC to put loads of 8 ohms. MAX9710 can be operated from ± 32V single power supply of ± 54V. This amplifier circuit is ideal for audio devices for home supply. STK4241V amplifier specifications might lead one to believe that you can use supply voltages of ± 78V. With zero input signal (and therefore no way out) I could, but I would not recommend anything better than ± 45V 8-ohm loads, if expected, although ± 54V will be fine if you can provide a good heat sink.

RING BELL ELECTRONIC CIRCUIT USING NE555 DIAGRAM This circuit produces oscillating frequency around 1kHz, and able to be converted by changing the value of resistor R1. The speaker will produce a long beep sound with 1kHz frequency. Here is the schematic : Parts list :     Resistor R1 : 10k ohm     Resistor R2 : 56k ohm     Capacitor C1-C2 : 0.01 uF     Polar capacitor C3 : 1 uF/15V     IC timer : NE 555     Speaker : 8 ohm 0.5 W     ON/OFF switch     5-15V Power supply

79xx is a widely known series of low-cost, fixed-negative-voltage regulators. These integrated circuits are available with output current of 100-150 mA (L series), 0.4-0.5A (M series), up to 1A (standard series), etc. They can be used in many applications other than regulators, audio power amplifier being one of them.  As shown in the circuit diagram, a simple stereo audio amplifier is built around two 7905 negative-voltage regulators (IC1 and IC2) and a few discrete components. The 7905 IC (a -5V regulator) used here is readily available. However, the circuit will also work with other 79XX regulators if appropriate power supply is used. Both channels shown in the diagram are identical. Hence the description below is only for the first channel. The quality of the output signal is within acceptable limits. Stereo Power Amplifier Using IC 7905 Circuit diagram : . Stereo Power Amplifier Circuit Diagram   Regulator IC 7905 works as an amplifier for the voltages applied to common...

Description. Many electronic circuits related to fan speed controlling have been published here and this one is just another approach. The circuit diagram shown here is of 12V DC fan speed controller using the IC LM2941CT which is a low drop out 1A voltage regulator. The IC has a dropout voltage as low as 0.5 and has also many useful features like power supply reverse protection, thermal protection, short circuit protection etc. The maximum output current the IC can source is 1A. The 12V DC supply is connected between the Vin (pin4) and ground (pin3) of the IC. The load, which is the fan, is connected across the Vout (pin5) and ground (pin3) of the IC. The network comprising of potentiometers R1, R2 and resistor determines adjust current (Iadj) of the IC. By varying the Iadj using the POT R2 we can adjust the output voltage of the IC and hence the fan speed. Circuit diagram. Notes. The circuit can be powered from 12V DC. The maximum possible load current is 1A. A heat sink is recomme...

This arrow led indicator electronic project can be used in some dark places to show the directions . You can use to indicate direction just an illuminated arrow or a flashing light , but is much nicer if the light moves in the correct direction. This arrow led indicator is based on 74HC14 circuit and some LEDs which are used to show the way . For this arrow led indicator we need six series of three LEDs arranged in the shape of arrows and are connected to the outputs . Each time the lit arrows move over by one column so it appears that the arrows run from right to left. Arrow LED Indicator Circuit Diagram If we want to change the speed of the moving light it’s need to change the value of C1 to C3 or R1 to R3 ( a lower value for this components decrease the time of moving lights). If we want a longer arrow we can mount in parallel with existing columns another columns . For power supply we can use batteries or 6V regulated power supply .

This Power Pulse Using by LM350 and NE555 Circuit Diagram can use to drive lamp,power LED,DC motor etc. Adjust R5 for output amplitude.Adjust R1 for output power .The LM350 is adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 3A over a 1.2V to 33V output range.This circuit requires 5-15V power supply. Power Pulse Using by LM350 and NE555 Circuit Diagram  

Build a Using Cd4066B Touch Switch Circuit Diagram.The CD4066B consists of four bilateral switches, each with independent controls. When touch switch SI is activated, R4 is driven high, and the control voltage goes high, which latches the switch. When S2 is activated, R4 goes low and the control voltage goes low, which deactivates the switch. Using Cd4066B Touch Switch Circuit Diagram

This white LED Driver circuit project is based on the NCP5680 high efficiency white LED Driver ic. NCP5680 supports double power flash LED and torch operation . The built-in DC/DC converter is based on a high efficient charge pump structure with 1X, 1.5X and 2X operating modes. The NCP5680 controller is designed to properly drives large external NMOS device with accurate control of the peak current flowing into the LED. Also, the NCP5680 chip includes Open Load and Overload Detection circuit to protect the system against faults at Vout or LED level. High Efficiency White LED Driver Circuit diagram Main features of the NCP5680 are : 2.7 to 5.5 V Input Voltage Range , Dual Power Flash LED Capability , Integrated Overload Protection , Selectable Flash/Torch Mode of Operation , Programmable SuperCAP Re−cycling Current , Capable to Share the DC Voltage to Supply Peripheral Circuits , Indicator LED Function , Integrated Photo Sense Function , Support Camera Strobe , Built−in Short Circuit Pr...

A very simple high efficiency led driver circuit can be designed using LNK454DG controller designed by Power Integrations . This LNK454DG led driver is configured as non-isolated discontinuous flyback converter designed to drive LED strings at voltages of 2.5 V to 3.5 V with an output current of 366 mA The circuit meets both line surge and EMI requirements and the low component count allows board dimensions required for LED candelabra bulb replacement applications. LNK454DG led driver is very easy to be configured and require few external electronic parts. LED Driver Schematic Two differential pi (π) filter EMI stages are used with C1, R1, L1 and C2 forming one stage and C2, L2, R2 and C3 the second.The incoming AC is rectified by BR1 and filtered by C1, C2 and C3. The total effective input capacitance, the sum of C1, C2 and C3, was selected to assure correct zero crossing detection of the AC input by the Switch-PL device and to meet high power factor and low THD. Due to the limited in...

I’ve already shown how to drive an N-channel MOSFET (or even an IGBT) in both high-side and low-side configurations in a multitude of ways. I’ve also explained the principles of driving the MOSFETs in these configurations. The dedicated drivers I’ve shown so far are the TC427 and IR2110. Some people have requested me to write up on MOSFET drive using the very popular TLP250. And I’ll explain that here. The TLP250, like any driver, has an input stage, an output stage and a power supply connection. What’s special about the TLP250 is that the TLP250 is an optically isolated driver, meaning that the input and output are “optically isolated”. The isolation is optical – the input stage is an LED and the receiving output stage is light sensitive (think “photodetector”). Before delving any further, let’s look at the pin configuration and the truth table. Fig. 1 - TLP250 Pin Configuration Fig. 2 - TLP250 Truth Table Fig. 1 clearly shows the input LED side and the receiving photodetector as well...

Many electronic projects require the use of a small audio amplifier. Be it a radio transceiver, a digital voice recorder, or an intercom, they all call for an audio amp that is small, cheap, and has enough power to provide adequate loudness to fill a room, without pretending to serve a disco! About one Watt RMS seems to be a convenient size, and this is also about the highest power that a simple amplifier fed from 12V can put into an 8 Ohm speaker. A very low saturation amplifier may go as high up as 2 Watt, but any higher power requires the use of a higher voltage power supply, lower speaker impedance, a bridge circuit, or a combination of those. During my many years building electronic things I have needed small audio amps many times, and have pretty much standardized on a few IC solutions, first and and foremost the LM386, which is small, cheap, and very easy to use. But it does not produce high quality audio... For many applications, the advantages weigh more than the distortion an...

This is a 200 Watt Amplifier Circuit Diagram that uses a TDA2030 IC which is an audio power amplifier 200 watt low cost. The 200 watts can be achieved with a load impedance of 4 ohms. The TDA2030 can typically provide up to 14 watts into a 4 ohm load, but if used in bridge mode and we use some cheap power transistors we can get to 200 watt. The design of this amplifier circuit 200 watt audio is very simple and requires few external components. For best performance, you can use a source of 28 volts (+ / - 14 volts), not more than 44 volts (+ / - 20 volts).  As you can see in the diagram, for this power amplifier circuit you need high capacity capacitors and a power supply high current. All transistors and ICS should be mounted on a heat sink to prevent damage by temperature. For small value resistors (1 ohm, 2.2 ohm) resistors use 2-5 watts.  200 Watt Amplifier Circuit Diagram using TDA2030

Welcome friends again to our website. In this article I will describe how to calculate matrix and determinate easily by using your scientific calculator. I will describe you the process used in CASIO fx-991ES calculator. MATRIX CALCULATION STEP-1: Press ON to switch ON your calculator. STEP-2: Press MODE and choose MATRIX. That means you have to press 6 to select MATRIX mode. STEP-3: Remember you can calculate up to three matrixes. You can calculate above this by using the result of three matrixes and carry out other mathematical operation by entering new data to the existing matrixes.  STEP-4: After that you have to insert the elements of the matrixes. So press 1 to enter the elements of matrix A. STEP-5: Then choose how many row and column matrix you have. Suppose you want to calculate for a (3 X 3) matrix then press 1 or any other number according to your need. STEP-6: Input your data. To input your data type the value of the first row and first column i.e. A 11 and press = to e...

This circuit is a battery eliminator 1.5 V , that is, a power supply of 1.5 volts , low consumption that takes as input the output of the USB PC or notebook. The power adapter is simple , it converts the voltage from 5V to 1.5V USB ports , using the popular LM317 IC and a few other components . To be exact this circuit uses only three components , one is the LM317 , R1 = R2 = 470 ohm and 100 ohm .  Eliminator 1.5 Volt battery using LM317 Circuit Diagram