High Voltage Meter or Probe Design

Common voltmeters, digital or analog, usually range to some hundred volts maximum. Higher voltages not only cannot be indicated, but will also destroy the instrument. However, the range of any voltmeter can easily be extended using extra series resistance, as shown in the figure. Calculating the necessary resistance implies knowledge of...

READMORE...

Rangkaian Transistor Tester

The circuit shown below is a simple circuit transistor tester. In some digital and analog avometer now mostly been contained this feature, but it can not hurt us a little more creative. This circuit can also be used to detect whether a transistor is NPN / PNP.Skema Rangkaian Transistor TesterCircuit operation is as follows. The 555 timer...

READMORE...

Rangkaian Regulator Variable Sederhana

Regulator Variable SederhanaA simple but less efficient method of controlling a DC voltage is to use a voltage divider and transistor emitter follower configuration. The figure below illustrates using a 1K pot to set the base voltage of a medium power NPN transistor.Skema Rangkaian Regulator Variable SederhanaThe collector of the NPN feeds...

READMORE...

Simple switch-Off Time Delay Circuit

Designing a switch off delay circuit is quite simple and will cost you no more than $5 to make. All parts can be picked up from Radio Shack or Fry's if you have them as well as Parts Express. This will cover the mechanical aspects of it - theoretical topics can come later. If you suffer from pops on your amps or any other components, this...

READMORE...

Simple Switch On Time Delay Circuit

This Switch On Time Delay circuit has been designed to create a lamp switch operated electronically with an option of setting a delay in the time of execution of operation to reduce one or more lamps in a stairwell or any other places where this circuit may be useful. The circuit can be useful to control various lamp or appliances that...

READMORE...

9 Second Countdown Power-On Relay With 7 segment Display

9 Second Countdown Power-On Relay CircuitThis circuit provides a 9 second delay using a 7 segment display. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces an approximate 1 second clock signal, decrementing the counter...

READMORE...

Driver Relay Menggunkan Transistor

Basic Transistor relay driver Bipolar transistor is a component that works based on the presence or absence of flow in the foot triggers the base. In the relay driver applications, the transistor works as a switch that at the time did not accept the current triggers, then the transistor will be in the position of the cut-off and does not...

READMORE...

Rangkaian Ampere Meter Digital

This is a circuit of a digital ampere meter with 4 digit LED 7-segment display, the circuit capable of measuring the current consumption up to 10A with selected 100mA, 10mA and 1mA accuracy, and consumes only about 25mA of current. The ammeter is based on single ICL7107 chip and 3.5-digit seven segment LED displays. Due to a Relatively...

READMORE...

Power Meter Schematic For Audio Amplifier

This is a simple schematic of audio power meter using LM3915 IC, this schematic can be used to measure the actual output power of your amplifier. For an audio engineer, this schematic Seems to be very helpful, especially for checking of sound system installation and field testing. Due to its logarithmic scale, the wide range of audio...

READMORE...

Sound Level (Decibel) Meter Circuit

This is a decibel meter electronic circuit, For an audio engineer, this circuit seems to be very helpful, especially for checking of sound pressure levels from about 60 to 70 Decibel (dB). EACH light represents about a 3dB change in sound level so That Pls all three lights are on, the sound level is about 4 times Greater than the level...

READMORE...

220V AC Operated Christmas Light Star Circuit

Here is a simple circuit of Christmas light star that can be easily constructed even by a novice. The main advantage of this circuit is that it doesn’t require any step-down transformer or ICs.Circuit of 220V AC Operated Christmas Light StarComponents like resistors R1 and R2, capacitors C1, C2, and C3, diodes D1 and D2, and zener ZD1 are...

READMORE...

220V AC Ultra Bright LEDs lamp Circuit

This ultra-bright white LED lamp works on 230V AC circuit with minimal power consumption. Ultra-bright LEDs available in the market cost Rs 8 to 15. These LEDs emit a 1000-6000mCd bright white light, like the welding arc and work on 3 volts, 10 mA. Their maximum voltage is 3.6 volts and the current is 25 mA. Anti-static precautions taken...

READMORE...

LTC4060 - NiMH/NiCd Battery Charger Circuit

This cheap and easy to build NiCd/NiMH Battery Charger circuit is suitable for automatically charging a wide range of batteries for many applications. This 'intelligent' charger was designed for high current and rapid charge applications such as cordless power tools and model racing cars. These battery packs are expensive and sometimes difficult...

READMORE...

Rangkaian 50Hz Accurate Oscillator

This circuit is a getting a 50Hz pulse. The oscillator circuit need only provide the IC ELM446, crystal and two appropriate loading capacitorsSkema Rangkaian 50Hz Accurate OscillatorNote: for greater accuracy as usual, it is also good practice to place a bypass capacitor across the power supply as well The IC ELM446 is an 8 pin digital divider...

READMORE...

Microphone Condenser Pre Amplifier Circuit

This is a simple preamplifier circuit for electret condenser microphone. using a LM1458 dual op amp IC. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn’t normally accept microphone level signals . Schematic Circuit of Microphone ElectretCondenser...

READMORE...

Mobile Phone Battery Charger Circuit

This Mobile phone chargers circuit presented here comes as a low-cost alternative to charge mobile telephones/battery packs.Circuit of Mobile Phone Battery Charger The 220V AC mains supply is downconverted to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 wired in bridge configuration and the positive...

READMORE...

Rangkaian On/Off 24 Hours Timer

This is a circuits are multi-range timers offering periods of up to 24 hours and beyond. This circuit can be used as repeating timers - or as single-shot timersSkema Rangkaian On/Off 24 Hours TimerThe Cmos 4060 is a 14-bit binary counter. However - only ten of those bits are connected to output pins. The 4060 also has two inverters - connected...

READMORE...

220 Volt Disco Lamp circuit

This disco lamp circuit is not a voice operated switch (VOX) because this circuit is too dumb to differentiate between musical sound or human voice. This is rather a sound activated than voice activated. One interesting application is to control your disco lighting automatically by the musical sound from high power amplifier, when the music...

READMORE...

Megabass Circuit

The following is megabass circuit schematic (rangkaian megabass) . The megabass circuit is a modified Baxandall tone control with no bass cut and no treble control. It boosts frequencies from about 30Hz to 160Hz can boost by 14dB.Skema Rangkaian megabassNote:The input capacitor can be replaced with a .01uf cap if you wish.The 10pf capacitor...

READMORE...

Rangkaian Toggle Switch With Relay

This circuit will energize and de-energize a relay at the push of a button. Any type of momentary action push-to-make switch can be used. Pushing the button once - will energize the relay. And pushing it a second time - will de-energize the relaySkema Rangkaian Toggle SwitchI've drawn the circuit with a single pole relay. But you can use...

READMORE...

IC 555 Motorcycle Alarm Circuit

Rangkaian Motorcycle AlarmThis circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike, flash the lights etc. I have used...

READMORE...

600 Watt Darlington Power Amplifier Circuit

This Power amplifier circuit is based around IC audio power amplifier driver (LM4702) manufactured by NATIONAL and darlington power transistors MJ11029 - MJ11028 by ON semiconductorsRangkaian 600 WattDarlington Power AmplifierNote:Recommended power supply voltage : 30V to 35VMax power supply voltage : 45VThis Power amplifier circuit produces...

READMORE...

10-Band Graphic Equalizer Circuit Diagram

This circuit allows you to equlize the audio signals in 10 band. It uses low amount op-amps (TL074 - JFET op-amp) to anatomy a able blaster circuit. The affection of the architecture is a classical band-pass alive filter. The VCC is in ambit of 12 ~ 15 VDC and The VDD is in ambit of -12 ~ -15 VDC respectively.Skema rangkaian 10-band graphic...

READMORE...

Rangkaian 12VDC Fluorescent Lamp Driver

Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce much more light for less power consumption. Secondly, their light color stays constant...

READMORE...

Rangkaian Lampu LED Untuk Motor (12 Volt Battery)

Lampu LED Untuk MotorLamp type LED has several advantages compared with the usual light when the applied on a motorcycle. In addition to more efficient battery when compared with normal hologen lamps, LED also has several other advantages, such as light more evenly and provide a luxurious feel to the vehicle.The following are examples of...

READMORE...

Rangkaian 220V Lamp Flasher

The 220V Lamp Flasher circuit basically is a line powered flasher which can be used in many applications such as the Chritmas lamp. Below is the circuit schematic diagramSkema Rangkaian 220V Lamp FlasherNote:Input supply - 6 ~ 12 VDCOutput - upto 200 W lamp / bulb loadOptically isolated Mains supplyOnboard preset to adjust the frequency...

READMORE...

Rangkaian Radar Pompa Air (Kontrol Ketinggian Air)

Radar Pompa Air (Kontrol Ketinggian Air)By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well.Skema Rangkaian Radar Pompa airNote:The two steel rods must be supported by a small insulated (wooden or plastic) board.The circuit can be used also with non-metal tanks,...

READMORE...

Rangkaian ON OFF Sleep Timer Switch

ON/OFF Sleep Timer SwitchThis timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch off automatically after some time, saving battery costs.Skema Rangkaian ON OFF Sleep Timer SwitchR1 and C1 provide a very long...

READMORE...

Skema Dancing LEDs, Following the Rhythm of Music

Dancing LEDsThe basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to five LEDs each, at 9V supply.Skema Rangkaian Dancing LEDsIC1A amplifies about 100 times the audio signal picked-up by the microphone...

READMORE...

Rangkaian LED 220VAC Sebagai Lampu Penerangan

The LED has advantages over other lighting technology. LED supposedly can hold up to 100,000 hours. This means that if the LED light 24 hours a day he would hold for 10 years. Whereas Fluorencent lights are usually only able to survive 1-3 years.This is a modified version of the circuit, Super bright LED Night Light published that can directly...

READMORE...

Rangkaian Speaker Protector sederhana

Speaker Protector sederhanaThis circuit follows will connects the speakers to the power amplifier output only a few seconds after the amplifier is powered ON, so that the speakers do not accept popped up by a high voltage and you would not Hear a loud thud sound from the speakers When the amplifier is switched on. This stuff is very harmful...

READMORE...

Rangkaian Magnetic proximity sensors

Here is the circuit diagram of a magnetic proximity switch sensor which can be used in various applications. The circuit is based on a magnetic reed switch as the proximity sensor. A monostable multivibrator based on NE555 and a toggle flip flop CD4013 does the rest of the circuit.Skema rangkaian magnetic proximity sensorsmagnetic reed...

READMORE...

Rangkaian Audio Channel Selector Stereo

Audio Channel Selector This circuit serves for connecting the stereo outputs from Four Different channels as inputs and only one of Them is selected to the output at any one time.When the circuit switch on, channel A (AR and AL) is selected. If no audio is present in channel A, the circuit Waits for Some time and then Selects the next channel...

READMORE...