Circuit of an automatic switch for audio power amplifier stage is presented here. The circuit uses stereo preamplifier output to detect the presence of audio to switch the audio power amplifier on only when audio is present. The circuit...
Friday, December 27, 2013
Boomer Audio Power Amplifier Using LM4906
The well-known LM386 is an excellent choice for many designs requiring a small audio power amplifier (1-watt) in a single chip. However, the LM386 requires quite a few external parts including some electrolytic capacitors, which unfortunately...
Build a Thermo Fan To Keep Your Amp Cool Circuit Diagram
How to Build a Thermo-Fan To Keep Your Amp Cool Circuit Diagram Thermo-Fan To Keep Your Amp Cool Circuit Diag...
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...
Build a 60Hz Power Inverter Circuit Diagram
Hi Friends to we build a simple 60Hz Power Inverter Circuit Diagram.In the 60Hz Power Inverter Circuit Diagram Capacitor C5 and potentiometer R12 determine the frequency of the output signal at pin 3 of IC1, the 555 oscillator. The...
Thursday, December 26, 2013
Single Chip Theremin Circuit Diagram
This schematic diagram show a single chip Theremin circuit. Theremin is an electronic music instrument which sense hand movement to control the tones/frequency. This Theremin circuit uses two separate Colpitts LC oscillators...
Simple Active ir Motion Detector Circuit Diagram
To explore how different motion detectors operate.To successfully build and test an ambient-light-ignoring active IR motion detector.Background There are a wide variety of motion detectors available currently. To allow a better...
1W BTL Audio Amplifier
The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The...
The self protection can avoid the happening of over voltage
The self protection can avoid the happening of over voltage for cell phone jammer . Domestic mobile Internet into the outbreak, followed by the huge market potential is attracting people of insight. With speeds faster and faster, more powerful mobile terminals, a number of new mobile Internet applications have emerged.Here are some examples of the Internet do a better job abroad, you can share with you. This is a combination of...
Wednesday, December 25, 2013
Simple Wind battery Charger Circuit Diagram
This is a Simple Wind battery Charger Circuit Diagram. The dc motor is used as a generator with the voltage output being proportional to its rpm. The LTC1042 monitors the voltage output and provides the following control functions....
Ultrasonic Dog Whistle
Its well known that many animals are particularly sensitive to high-frequency sounds that humans cant hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz....
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Administrator has the highest administrative authority
The intelligent shielding system of phone jammer intelligent system for a unit is built. System automatically before each run radio interface unit to connect the RF path calibration, system testing to ensure accuracy. Automated test software is the nerve center of the entire system, it can according to different types of test equipment and RF test instrumentation control switch, complete the testing process, test results...
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Panic Alarm
Imagine the Panic situation in the Midnight when an intruder tries to break into the house. This Alarm will help you with its loud Police siren to abort the attempt of intrusion. With a single clap, the circuit generates the alarm...
Dual Regulated Power Supply
In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. Dual Regulated Power...
Tuesday, December 24, 2013
The list of wholesale cell phone jammer has been prepared
The list of wholesale cell phone jammer has been prepared. Active set, also known as the active set, and assigned to the mobile stations former frequency to the traffic channel corresponding to the guide. Not in the active set, but has enough strength that the frequency corresponding to the base station with the guide to the business channel can be successfully demodulated pilot collection. Chinas leading communications technology...
12 volt Cellar Drain Pump
This circuit lets you control a pump, to keep the level of water in a cellar below a certain threshold, for example. Power is supplied to the pump by a battery that is recharged auto matically when the AC power line voltage...
Zener Diode Increase Regulator Output Circuit Diagram
A zener diode in the ground lead of a fixed pnp regulator varies the voltage output of that device without a significant sacrifice in regulation. The technique also allows the regulator to operate with output voltages beyond its rated...
TL594 12V DC Switch Mode Power Supply Rise
Basic Of Switch Mode Power SupplyIn recent years, the use of switch mode power supply (SMPS) has become more comon as more applications demand for greater power eficiency. It makes use of semiconductor (mostly MOSFET) fast switches...
Monday, December 23, 2013
Simple Precision full wave Rectifier Circuit Diagram
The circuit provides accurate full wave rectification. The output impedance is low for both input polarities, and the errors are small at all signal levels. Note that the output will not sink heavy current, except a small amount through...
Four in One Burglar Alarm
In this circuit, the alarm will be switched on under the following four different conditions: 1. When light falls on LDR1 (at the entry to the premises). 2. When light falling on LDR2 is obstructed. 3. When door switches are opened...
Automatic Night Lamp with Morning Alarm
This circuit automatically turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning. A super-bright white LED is used as the night lamp. It gives bright...
IR Beam Breaker Schematics
This is an Infrared beam breaking alarm ideal to use in entry or passages.It is based on the working of the popular IR sensor Module TSOP 1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of the circuit...
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Safety Guard
Simple unit, Protects home appliances from voltage spikes Protect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator...
Sunday, December 22, 2013
9V Automatic Battery NiCd Charger
This automatic NiCd charger for 9V NiCd batteries is using 555 timer properties and is very easy to build. Why is an automatic 9 volts NiCd battery charger? Because you can leave the battery for charging as much as you like: it will...
Build a Stand by Power Circuit Diagram for Non Volatile Cmos Rams
This is a simple Stand by Power Circuit diagram for Non Volatile Cmos Rams. To prevent loss of data when a CMOS RAM is switched from normal operation (Vcc = 5 volts) to stand-by mode (Vcc = VBAT) it must be ensured that the...
Running Message Display Schematics Circuit
Light emitting diodes are advantageous due to their smaller size, low current consumption and catchy colours they emit. Here is a running message display circuit wherein the letters formed by LED arrangement light up progressively....
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Wednesday, June 12, 2013
China mobile GSM phone white display solution
Welcome to the mobile phone repairing tips blog.This is my farts post on blog.my name is Rizwan Naz and i am a mobile repairing expert.My blog is all about the mobile phone;s software and hardware solution.Whenever you will...
Digital Keypad Combination Lock Circuit Schematic with explanation
This simple circuit is the electronic version of the combination lock. Using the special purpose LS7220 digital lock IC, the circuit allows a 4 digit combination of your choice to activate a relay for a set period of time. This...
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Nokia N91 Phone white display Solution
Nokia n91 is s very nice mobile phone but some time its create a different problem with display or LCD.Some time when you mobile on its not show the any display on the lcd or LCD show white.If its show the display blank(no lights...
Waterproof Directed Flashlight Ready For Any Objective
Anytime Id personally think about purchasing a brand-new light my personal thoughts introduced me back to a time when us just possessed any Maglite,or even the stock plastic range many of us experienced such as h2o. The actual Fenix Cree LED Flash light changed my thoughts about the approach My partner and i checked out the actual light. Directed highlights will be the tradition nowadays.Most like the Guided spotlights,because...
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Wednesday, June 5, 2013
Existing Feeds Vehicle Wiring Products Photo
Automotive Wiring Harness Automotive Wiring Harness For Seating.Automotive Wiring Harness 2.Http Www Vehicle Wiring Products E Oto 192175 Jpg.Ignition Wire Boots China Manufacturer Car Parts Components.Existing Feeds Http...
Hoppy Trailer Wiring Diagramhoppy Trailer Wiring Diagram
More Information About All New C K Trailer Tow Wiring Diagram Here.Band Graphic Equalizer Circuit Diagram Design Using Lmc835 Circuit.Towing Trailer Wiring 7 Pin 7 Waycarend Jpg.1997 2006 Jeep Wrangler 7 Pin To 4 Pin Adaptor ...
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Generic Diagram Trailer Wiring
This Allows You To Connect Up The Wiring To Tow A Caravan Or Trailer.Wiring Colors Http Www Tridenttrailers Com Trailer Wiring Diagram Htm.Trailer Wiring Diagrams Johnson Trailer Sales Colfax Wisconsin.Trailer Wiring Diagrams Johnson...
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