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To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adaptors available in the market are generally costly and supply an unregulated DC. To overcome these problems, an economical and reliable circuit of a high-power, regulated DC adaptor using reasonably low number of components is presented here.  Transformer X1 steps down 230V AC mains supply to around 30V AC, which is then rectified by a bridge rectifier comprising 5406 rectifier diodes D1 through D4. The rectified pulsating DC is smoothed by two 4700μF filter capacitors C1 and C2. The next part of the circuit is a seriestransistor regulator circuit realised using high-power transistor 2N3773 (T1).   Fixed-base reference for the transistor is taken from the output pin of 3-pin regulator IC1 (LM 7806). The normal output of IC1 is raised to about 13.8 volts by suitably biasing its common terminal by components ZD1 and LED1. This simple arrangement provides good, stable voltcuit age re...

This high quality and low cost speaker was designed to be used for iPod or iPhone with the use of old car Hi-Fi speaker and some computer components. Other materials used are shown in the image below and they include an amplifier, 240V-12V power supply, tweeters, crossovers, sealed lead acid battery, MDF, filler, Apple universal dock & remote, glue, nails, and white gloss paint. The front baffle board was drawn on a piece of MDF in order to use it as a template to make the rear of the box. The dimensions of the box based on the speaker do not necessarily need to be exact because the speakers were quite old as it comes from an old Renault 19. From the photo of the round bits below, the trusty circular saw was used to cut loads of 1 inch by 15 cm strips of MDF. Between the front and rear baffle, the strips were glued and nailed. The baffles were cut out using a jigsaw and the strips were kept as close to each other as possible. The first coat of filler can take 3 batches to finish an...

Are you having problems with your input Mains supply? That’s common problem associated with our input mains AC line, where a high and a low voltage conditions are quite frequently encountered by us. The simple circuit shown here can be built and installed in you house electrical board for getting a 24/7 safety from the possible dangerous AC voltage conditions. The circuit keeps the relay and the wired appliances as long as the mains input stays within a safe tolerable level and switches the load OFF the moment a dangerous or unfavorable voltage condition is sensed by the circuit. Parts List R1, R2 = 1K, P1, P2 = 10K Preset, T1, T2 = BC547B, C1 = 100uF/25V, D1 = 1N4007 RL1 = 12V, SPDT, TR1 = 0-12V, 500mA

Occasionally you come across some unusual  situations when setting up measurement  systems. The author once had to set up a system to register the vibrations and strain supposed to be  present in a contactor that operated at a voltage of 25 kVAC. One of the biggest problems with this project turned out to be the power supply for  the measurement system. Since it required  a power of about 30 W it wasn’t possible to  use batteries since the system had to operate  for many hours at a time. A logical solution  would seem to be to use an isolating trans-former, but still.25 kVAC means a peak volt-age approaching 40 kV, and on top of that  you would have to include a safety margin. In  addition, everything that is connected to high  voltage lines should also be able to withstand  lighting strikes! Circuit diagram : Power Supply with High Voltage Isolation Circuit Diagram Consequently the isolation should be able to  cope with a test voltage of 150 kV, which is a  lot to ask of the is...

Audio Power Amplifier is an important part in sound reproduction ina sound system. Audio Power Amplifier with this power IC LM 3886Audio Power Amplifier is a highly capable and able to produce68 Watt power avg. 4Ohm load and capable of producing power 38 Watt8Ohm load. With good sound reproduction capabilities of 20Hz-20kHz also possessed this LM3886 Audio Power Amplifier. Audio Power Amplifier LM3886 Speaker is equipped with protection that will protect the circuit output from over-voltage, under-voltage, over-loads, a short circuit power supply, thermal run-away and the temperature peak. Audio Power Amplifier LM3886 also equipped with noise reduction that can keep the audio system from noise well. Schematic power amplifier with LM3886 Feature owned LM3886 Audio Power Amplifie r 68W cont. avg. output power into 4Ω at VCC = ± 28V 38W cont. avg. output power into 8Ω at VCC = ± 28V 50W cont. avg. output power into 8Ω at VCC = ± 35V 135W instantaneous peak out...

To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adaptors available in the market are generally costly and supply an unregulated DC. To overcome these problems, an economical and reliable circuit of a high-power, regulated DC adaptor using reasonably low number of components is presented here.  Transformer X1 steps down 230V AC mains supply to around 30V AC, which is then rectified by a bridge rectifier comprising 5406 rectifier diodes D1 through D4. The rectified pulsating DC is smoothed by two 4700μF filter capacitors C1 and C2. The next part of the circuit is a seriestransistor regulator circuit realised using high-power transistor 2N3773 (T1).  High Power Car Battery Eliminator Circuit Diagram   Fixed-base reference for the transistor is taken from the output pin of 3-pin regulator IC1 (LM 7806). The normal output of IC1 is raised to about 13.8 volts by suitably biasing its common terminal by components ZD1 and LED1...

The circuit presented here detects interruption in security systems. Its features include no false triggering by external factors (such as sun-light and rain), easy relative positioning of the sensors and alignment of the circuit, high sensitivity, and reliability. The circuit comprises three sections, namely, transmitter, receiver, and power supply. The transmitter generates modulated IR signals and the receiver detects the change in IR intensity. Power supply provides regulated +5V to the transmitter and the receiver.  The power supply and the speaker are kept inside the premises while the transmitter and the receiver are placed oppo site to each other at the entrance where the detection is needed. Three connections (Vcc, GND, and SPKR) are needed from the power supply/speaker to the receiver section, while only two connections (Vcc and GND) are required to the transmitter. The transmitter is basically an astable multivibrator configured around NE555 (IC3). Its frequency should m...

High Frequency Waveform Generator Circuit Diagram High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. The core of this waveform generator is MAX038. This integrated circuit chip gives complete function to build a waveform generator/function generator. The circuit can be used to generate square wave, triangle, or sine wave by programming the pin inputs (A0:pin 3, A1:pin 4). A0 A1 WAVEFORM X 1 Sine wave 0 0 Square wave 1 0 Triangle wave The frequency can be controlled using current. If we disconnect the 20k RIN from REF (pin 1) and connect it to a DAC, then we can control the frequency using microcontroller or digital interface. We can even control the chip using a quartz crystal (PLL) by controlling the current using a phase comparator output that compares the sync output (pin 14 of MAX038) and a reference clock from quartz...

How to Build a High-Performance Interruption Detector Circuit Diagram . The circuit presented here detects interruption in security systems. Its features include no false triggering by external factors (such as sun-light and rain), easy relative positioning of the sensors and alignment of the circuit, high sensitivity, and reliability. The circuit comprises three sections, namely, transmitter, receiver, and power supply. The transmitter generates modulated IR signals and the receiver detects the change in IR intensity. Power supply provides regulated +5V to the transmitter and the receiver.  The power supply and the speaker are kept inside the premises while the transmitter and the receiver are placed oppo site to each other at the entrance where the detection is needed. Three connections (Vcc, GND, and SPKR) are needed from the power supply/speaker to the receiver section, while only two connections (Vcc and GND) are required to the transmitter. The transmitter is basically an ast...

High Current Step-Up Converter Using MAX641 integrated circuit, manufactured by Maxim IC, can be designed a very simple step-up converter using few electronic components. This step-up high voltage converter electronic projects allows a maximum output current up to 1A. High Current Step-Up Converter Circuit Diagram Low battery voltage detector input compare LB1 with internal reference of 1.31 V. LBO output goes in low state when the voltage at pin 1 falls below 1.31 V. The threshold voltage for "low battery", is determined by voltage divider R1-R2. LED D1 illuminates the LBO output when the input voltage falls below 2.62 V. Input voltage must remain below 5 V. The maximum effectiveness is 80% conversion.

Circuit Skema Rangkaian -  High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier , without switching-mode power supply. This ambit is of an 2 x 2,500W RMS Stereo amplifier , super - light and after switching-mode ability supply. The ambit aloof shows a channel, and the ability accumulation that it assists to the two channels. The audio ambit should be duplicated, but the ability accumulation assists to the two channels after problems. Circuit Skema Rangkaian Power Amplifier 5000W A adapted affliction should be destined to the careful agent of the audio line, that should be of audio-high-quality, of the blazon acclimated in microphone pre amps ascribe line. The accomplished accumulation (2 channels) of 5,000W RMS it should not counterbalance added than 32 lbs, already central of an adapted brownish box. WARNING: This ambit is alone for abecedarian use. It contains not-isolated genitalia of the electric AC net and it can be actual dange...

The Power supply circuit suitable with high power amplifier is well designed for large power amplifier circuit and amplifier circuit also requires protection quickly enough so as not to damage because of the power supply is less than the maximum performance or because of a short-circuit on a series of power supply and amplifier. Power supply circuit suitable with high power amplifier is equipped with a fuse, with earth protective chassis. So save on the amplifier and voltage shock to the chassis. In addition to the Power supply circuit suitable with high power amplifier the hum of voices issued almost non-existent because of the high frequency transformer has been issued because of grounded disappeared. In a multichannel amplifier, power supply will fell into one of three types. In order rising costs, and expected decreases the interaction between the channels, namely: 1. Transformer, rectifiers, and reservoir capacitors are shared between channels. 2. Each channel has its own transf...

This is the simple 12KV High Voltage Generator Circuit Diagram. The hobby circuit below uses an unusual method to generate about 12,000 volts with about 5uA of current. Two SCRs form two pulse generator circuits. The two SCRs discharge a 0.047uF a 400v capacitor through a xenon lamp trigger coil at 120 times a second. 12KV High Voltage Generator Circuit Diagram The high voltage pulses produced at the secondary of the trigger coil are rectified using two 6KV damper diodes. The voltage doubler circuit at the secondary of the trigger coil charges up two high voltage disc capacitors up to about 12KV. Although this circuit can’t produce a lot of current be very careful with it. A 12KV spark can jump about 0.75 of an inch so the electronic circuit needs to be carefully wired with lots of space between components. Source: DiscoverCircuits

This is a simple High voltage inverter circuit diagram . This inverter circuit works with a transistor and transformer and other components to increase the voltage becomes high. Input supply voltage ranging from 3V to 6V DC, later it was raised to high voltage AC. However, in this inverter circuit output current is very small, probably under 0.1A even smaller. However, its use you can apply it on a fluorescent lamp 10W maximum power only, and that too takes time to switch on fluorescent lamps.  High voltage inverter circuit diagram Part List R1 = 4K7 R2 = 2K2 R3 = 330K C1 = 100nF C2 = 100nF 275V C3 = 0.22uF 275V Q1 = D506 L1 = 100 times winding, with 0.8mm diameter copper wire L2 = 50 times winding, with 0.8mm diameter copper wire L3 = 5000 times winding, with 0.4mm diameter copper wire

By organizing the annual CES 2010, Pass Laboratories has recently introduced a new device that is X260.5 mono-block power amplifiers. X260.5 offers a power output of 260W and comes with the Super-Symmetry topology features that can improve performance by adjusting the characteristic value of balancing and damping amplifier distortion / interference. X260.5 device brings all the sonic advantages of mono-block operation for A / B high-power amplifiers in a physical package that can be managed device is half the physical size and weight of the device X600.5 Class D mono-block power. Simple physical size, weight that can be managed and high strength coupled with great performance make this device as the Pass Laboratories ideal power-amp in any system that refers to a 2-channel and multi-channel format. In addition, it also brings flexibility X260.5 combination for consumers who already have a device Pass Laboratories Stereo amp and want to add an additional channel power amplifier that is ...

Firstly, I'd like to stress that the intended use of this circuit is only one of many possible applications. Apart from the obvious usage as a headphone amplifier, the circuit can be used for a range of applications where a wide bandwidth low power amplifier is needed. Some of the options include ... Reverb drive amplifier - ideal for low and medium impedance reverb tanks High current line driver - suitable for very long balanced lines Low power speaker amplifier - better performance than small integrated amps ... and of course, a headphone amp. In short, the amp can be used anywhere that you need an opamp with more output current than normally available. Since most are rated for around ±20-50mA, general purpose opamps are not suitable for driving long cables or anywhere else that a relatively high output current is needed. As a headphone amplifier, this design is very similar to others on the ESP site, but the main difference is that this one (and P70) has been built and fully tes...

Using LTC3600 manufactured by Linear Technology, can be designed a very simple high efficiency LED driver with programmable dimming control . LTC3600 is a monolithic synchronous buck regulator whose output is programmed with just one external resistor. LED Driver Using LTC3600 Circuit Diagram This LED driver with programmable dimming control electronic project circuit diagram has a dimming current between 20 and 500mA. In this circuit diagram are used three LUXEON LXML-PWN1-0100 neutral white 350mA LEDs.

Occasionally you come across some unusual  situations when setting up measurement  systems. The author once had to set up a system to register the vibrations and strain supposed to be  present in a contactor that operated at a voltage of 25 kVAC. One of the biggest problems with this project turned out to be the power supply for  the measurement system. Since it required  a power of about 30 W it wasn’t possible to  use batteries since the system had to operate  for many hours at a time. A logical solution  would seem to be to use an isolating trans-former, but still.25 kVAC means a peak volt-age approaching 40 kV, and on top of that  you would have to include a safety margin. In  addition, everything that is connected to high  voltage lines should also be able to withstand  lighting strikes! Circuit diagram :   Power Supply with High Voltage Isolation Circuit Diagram Consequently the isolation should be able to  co...