Classification Transistor Amplifier

A transistor amplifier must have a DC biasing circuit for several reasons. Especially, we will need two separate voltage supply to provide the desired class bias voltage to the emitter-collector and emitter-base. In fact it is actually only done in certain applications, but found that biasing voltage can be obtained separately from a single supply. Second, the transistor is...

Read More

Workings of STR IC Regulator Power Supply

The meaning STR in this article for example is a Sanken regulator series and Fairchild series STR-F/G/W KA05Q Is an ic Quasy Resonant Flyback (QRF) Swiching Regulator comprising (a) control IC and (b) power MOSFETs that are packed into a single unit. The regulator is designed so that only requires a few external components.How it works :A. UVLO (under voltage lock out)Regulators...

Read More

Circuit of Simple Temperature Detector

This is an explanation about circuit of simple temperature detector. In many ways, the development of science and technology is getting easier for human activities (especially those who are ready to receive it), the various creations of human creativity in any variety of small things to things that are not small. create excessive heat detection circuit of an object (could...

Read More

50Watt Audio Power Amplifier Circuit with LM3876

My account of architecture of this activity was to advance a bunched architecture for a stereo amplifier can be chip by a amiss (but the complete affection conscious!) Living apprentice at a university or a academy dormitory. The amplifier feeds a brace of speakers with two LM3876 amplifier chip circuits (50 watts per channel), or a brace of headphones Meier Crossfeed through...

Read More

60W inverter using transistors

Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable multivibrator. The output from the collector of Q2 is connected to the input of the Darlington pair formed by Q3 and Q4.Similarly the output of Q1 is coupled to the input of the pair Q5 and Q6. The output from the Darlington pairs drive...

Read More

Circuit Serial To LCD

In making an electronic device using a microcontroller, we often faced with shortages in ports for line I / O or LCD viewer. In the article series LCD with 74HC595 Serial To this there is a solution to overcome the lack of ports or pins of the microcontroller is to convert the parallel bus system such as the LCD into a serial sequence To Serial LCD with 74HC595 this. The series...

Read More

Automatic lamps with photocell

This is a photocell circuit for detecting the light intensity. At full light the resistance of the photocell will be few ten ohms and at darkness it will rise to several hundred ohms. IC1 Op amp uA741 is wired as a comparator here. At darkness the resistance of photocell increases and so the voltage at the inverting input of the IC1 will be less than the reference voltage...

Read More

Simple Light Switch

Light switch is a simple circuit that can be used to control the LEDs based on surrounding light. Sensors used to detect the light on this circuit using LDR Light Switches. This circuit uses only three transistors and a few supporting components. As a contactor for Light Switches lamp circuit uses relay. To set the sensitivity of the exposure can be adjusted by adjusting R7....

Read More

87 108MHz FM Wireless Microphone

This FM wireless microphone is easy to build and has a useful range of transmission (over 300 meters outdoors). Despite its small number of components and an operating voltage of 3V to easily penetrate over three floors of an apartment building. You can tune anywhere on the FM band (87-108MHz) and its transmissions can be picked up at any point of view of the FM receiver.The...

Read More

STEREO HEADPHONE AMPLIFIER USING LM4910

LM4910 belonging to the Boomer series of National Semiconductors is an integrated stereo amplifier primarily intended for stereo headphone applications. The IC can be operated from 3.3V ans its can deliver 0.35mW output power into a 32 ohm load. The LM4910 has very low distortion ( less than 1%)   and the shutdown current is less than 1uA. This low shut down current makes...

Read More

CONVERTING CD ROM DRIVE TO AUDIO CD PLAYER

Here is the simplest scheme for converting a CD ROM drive of your computer to a Audio CD player. The minimum requirement for the player is that, it should have a audio output and skip button.The CD ROM drive needs two voltages, 12V & 5V for its operation. So the main objective is to build a suitable power supply for the CD ROM drive. The IC1 (7812) together with associated...

Read More

230V Led Flasher Circuit using DIAC

This is a very simple LED flasher circuit diagram that is powered from AC 230V mains. This Flasher can be used as a power indicator for the AC 230V mains supply. This circuit is made with few numbers of parts namely, a LED, two Resistors, one Capacitor, one Diode and one DIAC.  The DIAC act the main role to flashing the LED. DIAC is a bidirectional device. It conducts...

Read More

EPSON Stylus PHOTO RX600 610 RX620 630 Pinout Connector Diagram

The following table provides detail of EPSON Stylus PHOTO RX600|610 and RX620|630 pinout and connector. CN No. CN3 CN4 CN5 CN6 CN7 CN8 CN10 CN11 CN12 CN13 CN14 Color White (FFC) White Red White (FFC) White Black White (FFC) (FFC) Pins 14 25 5 4 3 30 3 4 4 19 25 Connection Point Power Unit CCD Module TPU Inlet Holder Scanner Motor HP sensor circuit board Panel circuit...

Read More

PC Heat Monitor

The PC processor generates very high temperature during its operation which is dissipated by the large heat sink placed above the processor. If the heat sink assembly is not tight with the processor or the cooling fan is not working, PC enters into the Thermal shutdown mode and will not boot up. If the PC is not entering into thermal shutdown, the high temperature can destroy...

Read More

Buck Converter 1 Watt White LED Driver

This is an example of efficiently driving a 1 watt white LED from a 12 volt battery using a buck converter. The LED could simply be connected with a series resistor to get the desired current, but the efficiency would be only 25% since the resistor would drop 9 volts while the LED only requires 3. The buck converter provides about 90% efficiency. The idea is to establish a...

Read More

TL783C based 48V PHANTOM POWER SUPPLY circuit with explanation

This is a simple 48 V regulated linear power supply design that will provide up to 60 mA of current. This circuit is based on the Texas Instruments TL783C high voltage adjustable linear regulator IC, because this device will provide short circuit protection for an input to output differential voltage of up to 125 V. AnLM317T can also be used in this circuit, but a short on...

Read More

Oscillation Monitor

The circuit in the diagram was originally designed to monitor an oscillator, but can also be used as a general-purpose level indicator for a.c. signals. It is based on a quadruple IC containing four NAND gates. Only three of the gates are used, making the fourth free for other purposes. All the gates have a Schmitt trigger input. When a 5 V supply is used, the Type 74HC132...

Read More

Green USB switch

According to the Energy Saving  Trust, if you add up all the current drawn in standby mode by items such as stereos, TVs, VCRs and DVDs over a year in the UK alone, it amounts to 3.1 million tonnes of CO2 released into the atmosphere.This is without factoring in the current drawn by all the PCs,laptops and their associated peripherals left in standby mode. Circuit...

Read More

Simple 16 Stage Bi Directional LED Sequencer

The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate can be adjusted with the 500K pot. Two additional Schmitt Trigger inverters are used as a SET/RESET latch to control...

Read More

Simple 7805 Voltage Regulator Circuit

A voltage regulator is used to produce a constant linear output voltage. It’s generally used with AC to DC power supply. And also it can be used as well as a DC to DC voltage converter . To regulating low voltage, most used device is one single IC. 7805, 7812, 7905 etc. 78xx series are design for positive and 79xx series are for Negative voltage regulator. 7805 is a three...

Read More

Simple Automatic Headlight Brightness Switch Circuit Diagram

Going by car the highway with your high-beam headlights can actually increase your visibility, but can be a blinding hazard for other drivers. This easy circuit can be connected into your headlight swap to provide automatic swaping between high and reduced beam headlights when there is oncoming traffic. It does this by feeling the lights of that traffic. In this way, you can...

Read More

Intelligent Electronic Lock

This intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequentially. For deception you may annotate these switches with different numbers on the control panel/keypad. For example, if you want to use ten switches on the keypad marked ‘0’ through ‘9’, use any four arbitrary numbers...

Read More

Precise FM Tuning Indicator

Here is an add on circuit to your FM radio for precise tuning of stations. Usually an LED indicator is provided in FM radio to see whether the station is tuned or not. But it is difficult to see the precise tuning points since the variation in the LED brightness cannot be detected easily. This circuit solves the problem. Precise  FM Tuning Indicator Circuit diagram :...

Read More

High Voltage Generator

This high voltage generator was designed  with the aim of testing the electrical break-down protection used on the railways. These  protection measures are used to ensure that  any external metal parts will never be at a  high voltage. If that were about to happen,  a very large current would flow (in the order  of kilo-amps), which causes the...

Read More

Easy Make a Lights On! Schematic

This circuit ensures that you will never again forget to switch on the lights of your car. As soon as the engine is running, the dipped beams and the sidelights are automatically switched on. The circuit also causes the dipped beams to be extinguished as soon as the main beams are switched on. As you can see from the schematic diagram, no special components are needed.When...

Read More

Simple Mixer with 4 Input

Here the simple mixer with 4 input and 2 op-amps:Simple Mixer with 4 Input Circuit diagram :A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net gain of ten (or any other reasonable gain) by reducing the input resistor towards the second op...

Read More

Security System Switcher

An audio signal can be used as a form of input to control any security system. For example, an automatic security camera can be configured to respond to a knock on the door. The circuit described here allows the security system to automatic in on state. It uses a transducer to detect intruders and a 5V regulated DC power supply provides power to the circuit. As shown in Fig....

Read More

Battery Juicer

More and more electronic devices are portable and run off batteries. It is no surprise, then, that so many flat batteries find their way into the bin and often far too early. When a set of batteries can no longer run some device for example, a flashgun the cells are not necessarily completely discharged. If you put an apparently unserviceable AA-size cell into a radio-controlled...

Read More

transformerless power supply circuit

1- transformerless power supply circuit 11 voltsParts :C1 = 0.39uF 250V CapacitorC2 = 220uF 25V Electrolytic CapacitorD1 = 1N4741 11V Zener DiodeBR1 = 1 Amp 200V Bridge Rectifier2 - TransformerLess Power Supply circuit 12V 10...

Read More

HANDY 0 12V DC POWER SUPPLY ELECTRONIC DIAGRAM

HANDY 0-12V DC POWER SUPPLY ELECTRONIC DIAGRAMFor heat protection, heat sink is needed for the BD679 transistor. It is because it will be over tempered when works more than 200mA.FEATURES:0v to 12 volt output:- 700mA with M 2155- 1.4amp with M 2156- 1A with 16v AC 1.5 amp plug p...

Read More

30W GUITAR AMPLIFIER ELECTRONIC DIAGRAM

30W GUITAR AMPLIFIER ELECTRONIC DIAGRAMThis is design of 30W Guitar Amplifier ELECTRONIC DIAG...

Read More

RESISTOR TO REDUCE L200 POWER DISSIPATION ELECTRONIC DIAGRAM

RESISTOR TO REDUCE L200 POWER DISSIPATION ELECTRONIC DIAGRAMInstead of in series with the input, the resistor R can be connected between pins 1 and 2 of the IC if the load is constant. You can see this in the right figure. This will make some part of the load current flows through the resistor and the other part through the devi...

Read More

Digital 100W RMS Amplifier Circuit Diagram

This is a Digital 100W RMS Amplifier Circuit Diagram.This is a 100 watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance (read: musical quality) than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I originally built this thing, it was because...

Read More