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2W(2 km) 88-108 MHz frequency VHF/FM transmitter

01/23/2015 23:48:54 PM

This is FM transmitter in VHF range. As Figure 1 Sonar with up to 2 watts, when used with a supply voltage of about 24V. In the case of applications typically do not want a high transmission. This circuit requires only one power supply 9V Only. If us > read more

The twin-T complementary amplifier circuit with filter selector

01/17/2015 22:10:49 PM

The filter circuit of this main circuit will sent to through to the signal that middle frequency. At the same time is attenuated the others frequency into input signal to R1 through the base of emitter circuit as complementary form (T1/T2). And the f > read more

Amp meter for CAR

01/14/2015 07:04:19 AM

Sometimes disorders of cars on the electrical system. Can not be analyzed by the voltage of the battery, always. Using an ammeter to check. It will help to diagnose the problem better. This circuit is an amp meter LED display is not afraid of vibrati > read more

Dynamic Compressors without power supply

01/11/2015 01:28:32 AM

This dynamic compressors circuit that The reduction rate of the signal up to 20 dB at input between 100 mV to 10 volts. This circuit does not use external power. But used part of the input signal into a power supply. To reduce size of the signal. A p > read more

Power outages prediction circuit

01/08/2015 22:52:54 PM

This circuit can be used to prevent a power failure. Example: Microcomputer systems. This circuit will send logic pulse “1″ shortly before the power goes out completely. To trigger the power outage protection circuit for working. Or use t > read more

2 watts + 2 watts Stereo Using Three LM386

01/07/2015 05:45:24 AM

This is 2 watts + 2 watts Stereo small amplifiers using three LM386 ICs. It is cheap and easy to builds for beginner. A basic of amplifier The most normal power amplifier as Figure 1 that connected to directly a positive of speaker and the negative t > read more

Donkey Sound Generator Circuit

01/01/2015 07:42:25 AM

This is a Donkey sound generator project that easy to builds because use simple components include three IC-555 and LM386 and more little parts. Although at present we use Micro controller IC because small. But some times it is hard to find, so this > read more

Small christmas LED flasher circuit with sound

12/26/2014 08:31:34 AM

The Christmas LED flasher circuit is small and easy and cheaper than this circuit. It suitable for beginner. How it works In Figure 1 is the Schematic diagram of this project. First the LED display section, there are IC1- CD4093 as main, inside IC ha > read more

Cheap led christmas light flasher circuit is controlled by audio

12/22/2014 02:51:52 AM

This project is designed to meet the needs of create particular project. In order to get the Christmas and New Year. I suggest the project get to the upcoming festival. This project is an LED chaser that is controlled by the voice signal. This princi > read more

The transistor lat as SCR trigger

12/22/2014 02:25:43 AM

This circuit works similar to a SCR. When the trigger input is high, Both transistors Q2(PNP transistors) and Q1(PNP transistor) will work. Therefore, a current flow to the base pin of Q2, it has voltage 0.7 volts at resistor R1. When cutting the act > read more

Current-controlled Sawtooth Generator Circuit

12/19/2014 02:53:52 AM

This Sawtooth wave generator circuit include of the frequency oscillator is controlled by current. Which can generate the sweep frequency in wide range. Suitable to be applied in the field of music equipment and a narrow pulse output. Also we are abl > read more

Low-volts Crystal Frequency Generator Circuit

12/18/2014 02:26:20 AM

We can easily use FET and Crystal to generate the frequency and In particular, this circuit use very low voltage. It can operate at a supply voltage to 1.5 volts only and at crystal frequency 100 KHz to 10 MHz. The crystal is connected to between the > read more

Simple Crystal oscillator Circuit

12/17/2014 11:01:18 AM

This is simple crystal oscillators that provided square wave of 1MHz to 10MHz, Use an inverter gate IC and control frequencies with crystal. A oscillator or a frequency generator provide waveform out in various forms. For example : sine wave, Triangu > read more

Many the 12V 1A power supplies circuits

12/14/2014 20:11:22 PM

Mr jafar need to use the 12 volts 1 amp DC Power Supplies. In my sites has many circuits related them. - Cheap and old but sure, use transistor and zener as main http://www.eleccircuit. > read more

D/A converter circuit for motor controller

12/13/2014 21:19:55 PM

We control easily a motor to stop and rotate. If need to control it on linear feature is speed high-low difference so use this circuit. In Figure below, we use the 4 bit comparator circuit that output to the input of EXCLUSIVE-OR gate. Then, it is fe > read more

1KHz Signal injector for electronic technicians

12/09/2014 23:10:57 PM

A signal injector is important tools for the electronics technicians it small and cheap. This project is better the simple circuit because it has 1KHz and many frequency harmonic. The normal signal injector has a square wave output about 1KHz. Which > read more

Constant current circuit using LED

12/05/2014 01:01:48 AM

Normally the voltage drop across LED while forward bias will be about 1.2 to 1.4 volts depend on type of LED by has the temperature coefficient is -1.5 mV per degree Celsius. Which similar to the temperature coefficient of junction. between a base an > read more

Rising-edge trigger R-S Flip Flop circuit

12/03/2014 02:47:40 AM

The normal R-S flip flop circuit include of two nade gate are connected together and when need to set or reset then feed the logic signal is “1” instead trigger and use inverter work instead. In Figure 1 suppose begin state of both input is & > read more

Power Battery Saver Circuit

12/02/2014 01:43:15 AM

The power battery saver circuit when use normal lamp. In some times a lamp that is used have too bright. To adjust the brightness with the variable resistor, it would not be appropriate. because power loss too much. For this circuit can save the powe > read more

Super Steady Zener diode circuit

12/01/2014 20:25:19 PM

This circuit is used for controls the voltage battery is steady, which the zener diode apply very low current about 1mA only, cause there is ripple voltage about 1 mV at voltage changing between 10 to 30 volts. As circuit the output is fixed to 8V. I > read more

Complementary common-emitter circuit

12/01/2014 06:18:36 AM

This complementary common-emitter circuit has special feature that can be applied in 2 model. - Low distortion buffer - The low power output circuit How it works In Figure 1 quiescent current flow through T1 and T2 as voltage (U) and R1, R2 sequence. > read more

The CMOS current controlled oscillator circuits (CCO)

11/30/2014 20:24:52 PM

We can use a CMOS nand gate or inverter gate and two transistors into the current controlled oscillator circuit (CCO). In Figure 1 use two inverters are connected together as a astable multivibrator circuit. Figure 1 the normal astable multivibrator > read more

Non-inverting integrator circuit using op-amp

11/29/2014 18:34:03 PM

This is non-inverting integrator circuit that is improved that below. The obstacles of old integrator as Figure 1, is Connection of RC is at a virtual ground, cause C into the capacitive load across output of op-amp. It makes an impact on the Slew ra > read more

Voltage to Frequency Converter Circuit

11/28/2014 07:04:15 AM

This voltage to frequency converter circuit use the CA3130 OP-Amp ICs, that linearity Of changing is very well up to 0.5% and Temperature coefficient of less than 0.01% per degree Celsius. In Figure 1, IC1 act as the frequency generator is controlled > read more

Simple resistive load

11/26/2014 18:56:47 PM

Sometimes we need to use a resistors that without capacitance or inductance. We always use the carbon resistors. But some working to need the resistor that has also many high power. Which we cannot use the carbon resistor because it has maximum power > read more

Tremolo Effect Circuit using uA741

11/25/2014 02:28:23 AM

The tremolo effect circuit widely used, making noise in the electronic music scene. The height of the modulation signal by low frequency between 1 Hz to 10 Hz. This result will sound good, When frequency be modulated in sine. Figure 1 Tremolo Effect > read more

Noise Filter for Stereo system

11/24/2014 10:57:15 AM

In the receiver, stereo radio station. Usually have more noise than listening in mono. Because, the stereo system is splits signals-to-noise ratio. (S/N) There level lower, cause interference, in mono with less. becausePhase noise of the 2-back phase > read more

Dual DC power using 2 terminal transformer

11/21/2014 04:35:11 AM

There are many ways to build the dual power supply from a transformer that has one secondary coil.This good way as Figure 1 use two bridge diodes. The first section is normally working, others section (D1-D4) will work by AC signal from C1 and C2. To > read more

Hum Filter using electronic coil

11/19/2014 10:38:16 AM

There are many ways to filter the hum noise from AC line (50 Hz) from audio signal away. A frequency filter usage is a simple ways that include RLC as the electronic coil. In Figure 1 is the specific frequencies filter. Figure 1 the simple specific f > read more

Analog To Digital Converter Circuit Using Simple Parts

11/17/2014 11:05:28 AM

Usually an analog to digital converter circuit or A/D that need to use the high accurate devices and and high difficult. But this circuit, The error of all devices does not affect the accuracy of the circuit. We just use the reference voltage only. H > read more

Low Noise Pre Microphone Amplifier

11/15/2014 10:10:39 AM

Here is two low noise Pre microphone amplifiers. Which is simple circuit but high quality sound,includes devices that are selected very well. This circuit can be used to all normal microphone, for example: the dynamic microphone of Europe zone that h > read more

DIY Cheap Resistance Decade Circuit

11/13/2014 21:07:05 PM

Here is DIY resistance decade tool for testing and calibration, because it can be substituted into a circuit with a all standard value. This ideal is cheapest that use resistors and wires only. In each experiment, a resistor must be involved at all t > read more

Symmetrical Harmonic Oscillator circuit.

11/10/2014 23:03:28 PM

This is the Symmetrical Harmonic Oscillator by the harmonic 3 that without tuning circuit because normal circuit use harmonic frequency always has the tuning frequency circuit. This is Astable multivibrator Oscillator circuit that has the crystal acr > read more

27MHz CB Amplifier Circuit

11/09/2014 04:18:22 AM

The V-MOS FET number VN66AF (as Figure 1)is produce of the Siliconix company, for outstanding features are as durable and high gain. Most application of this is a normal power amplifier circuit. It can be used as the RF amplifier circuit. Figure 1 th > read more

Simple 555 ICs tester circuit

11/03/2014 10:32:12 AM

Most IC-555 is used to generate frequency, and sometimes we need to know. Is it good or bad? But normal multimeter cannot check it. Thus, I make a simple 555 ICs tester circuit. Which is tested correctly and faster. How it works Resistors R1-R3 acts > read more

Electronic Head or Tails Circuit

11/01/2014 21:57:35 PM

This is an electronic head or tails circuit ,that same really the head or tail playing very little head by following several steps. -First of all,turn on switch, LED display show digit “0”. -Secondly, press the button “rotate” then the coins > read more

True RMS Converter circuit

10/30/2014 03:23:59 AM

This is an true r.m.s. Converter circuit. Normally we need a device with low tolerances,and very accurate tuning. But this circuit is used a simple device, plain and decent quality. This circuit use principle of automatic gain control (AGC). Which in > read more

Dual RS232 port selector circuit

10/29/2014 04:57:42 AM

This is a Dual RS232 switch selector circuit to one computer that have one RS232 port into two ports for two computers. In circuit is simple and cheap without ICs so easy to build. Normally, we will always use the D connector because strong, can be p > read more

20A/ 12V-24V DC Motor controller using TL494 and IRF1405

10/28/2014 00:53:33 AM

This is the high quality PWM 12V-24V DC motor controller circuit for that has the low voltage battery checker system, working with soft start, adjust pulse frequency, use for 12V or 24V battery at current up to 20A. Although small and simple, but cou > read more

One button code Switch

10/25/2014 22:25:09 PM

The most code switch will be a key number 1 to 10 is good. But when I press a number key often until has track, making it possible to guess the code. This circuit use the normal door bell switch is the code enter. The code include pulse short and lon > read more

Current Transformer AC Load LED Indicator circuit

10/24/2014 23:31:41 PM

This is the LED indicator for show AC current load, that use the transformer and LED as based of circuit. Sometimes we need to detect the large AC current. One way is the LEDs is connected with the resistors and the diode 1N4001 networks. But this ha > read more

VHF Dip Meter circuit

10/23/2014 23:18:05 PM

This is a simple VHF dip meter circuit.The DIP meter is the frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude. The circuit include variable frequency generator circuit, rectifier and a moving coil > read more

Digital logarithmic sweep signal generator circuit

10/23/2014 00:14:33 AM

This is a Digital logarithmic sweep signal generator circuit by use the average digital, It is designed to use together with the frequency generator by voltage controller. How it works From the circuit in figure 1 is the 14-bit binary counter circuit > read more

Tape head preamplifier using UPC1032

10/22/2014 09:09:38 AM

This pre-tape circuit is cheapest for beginner only. And easy to builds because use one IC-UPC1032 only as Figure 1. Fig1: The circuit diagram This is stereo can connect to the tape header that resistance between 200-600 ohms at output amplitude abou > read more

5 volts DC Regulator Without Transformer Using MOSFET

10/22/2014 02:37:38 AM

This is 5 volts DC Regulator power supply that without the transformer so small size, use the MOSFET is based. It is suitable the digital circuit. Caution! This circuit requires very careful to create. Because there is a high voltages many areas. The > read more

10V to 350V Adjustable Regulator DC Power Supply

10/21/2014 07:32:36 AM

Here is an adjustable regulator DC power supply circuit that can be provided the output high voltage is 10V to 350V. It use the transistor is based so we use often use them. Now, a transistor can tolerate more high pressure. For example; in this circ > read more

Electric fish shocker circuit

10/18/2014 05:04:18 AM

This is the simple electric fish shocker circuit or fish stunner. It helps in catching fish easier, it use 12V battery to convert to 220V AC. We use few parts so easy and cheap. How it works This circuit convert voltage from 12V battery to AC 220 vol > read more

NE5532 datasheet; Dual low noise operational amplifier

10/17/2014 07:16:08 AM

NE/SA/SE5532/5532A: Internally-compensated dual low noise operational amplifier The 5532 is a dual high-performance low noise operational amplifier. Compared to most of the standard operational amplifiers, such as the 1458, it shows better noise perf > read more

5 watts Class A amplifier using NE5532 and MJ2955

10/16/2014 20:28:54 PM

> read more

How to build the PCB by yourself

10/11/2014 10:24:54 AM

Creating a PCB is difficult. If you want to create your own PCB. I find good information on various websites. For the benefit of friends. This week, I collaborated with Xander to show you how to make your own printed circuit boards (PCBs) using a las > read more

Automatic duty factor controlled circuit

10/11/2014 06:03:50 AM

We can use the schmitt trigger to generate the simple square wave. The duty factor of output waveform will be determined by the input waveform. But the threshold level is the importance. In Figure 1 will have the output while input waveform as Figure > read more

Linear opto isolator circuits

10/10/2014 11:07:05 AM

This is the linear opto isolator circuits that use a few parts and cheap. In circuit we use the opto compiler ICs number of MOC 5010 as based. It can be used many ways. For example ; separate the circuit from the power line, send audio signal, Electr > read more

LM386 audio amplifier circuit with PCB

10/09/2014 19:15:48 PM

This is an audio amplifier that can be used with a small 9 volt Battery Operated,Current use as little as 5 milliamps.And amplification up to 500 mW. Which is sufficient to expand the sound from a sound about or the CD Walk Man out to the small speak > read more

Cheap adjustable 0-30V 2A Laboratory DC Power Supply

10/09/2014 05:48:27 AM

This 0-30V power supply is the variable voltage Regulator at 2A max, by used IC-723 for control volt stable regulated. The 2N3055 power transistor for boost up current to 2 Amp. It suitable for general electronics work shop. Because it is a simple ci > read more

0-30V,0-2A adjustable voltage and current regulator

10/08/2014 03:17:22 AM

This is the 0-30V,0-2A adjustable voltage and current regulator that developed from the cheap adjustable 0-30V 2A Laboratory DC Power Supply project using LM723 is used widely, for a long time. This project can control the amount of current flow is m > read more

True R.M.S Converter circuit

10/07/2014 00:05:24 AM

This is a true r.m.s. Converter circuit. it use parts that easy to find and the normal quality. But we must to use normally parts that Low tolerances and more precise tuning. This use principle of the automatic gain control circuit; AGC). Which inclu > read more

Duty factor meter circuit

10/04/2014 06:41:20 AM

This is the simple duty factor meter circuit. We use mosfet and meter and more few part. So easy and cheap than others tools. How it works. The duty factor of square wave signal can be measure by the pulse counter circuit or the oscilloscope. Figure: > read more

Cheapest signal cleaner circuit

09/29/2014 18:23:18 PM

Here is the simple low noise filter circuit for any FSK signals that weak and have noise. This use few parts so easy and cheap. Fig 1: The schematic of this project As Figure 1 is the schematic diagram. This circuit include the low filter circuit thr > read more

Traffic light controller circuit

09/28/2014 09:15:10 AM

Today, let’s look at 2 model of traffic light circuits. They use the LEDs for display and the digital circuit as based. This circuit include IC-4027,CD4017,IC-555 and a few parts so easy and cheap. First model circuit. This circuit is designed > read more

CD4027B_datasheet of Dual J-K Flip-Flop

09/26/2014 05:40:03 AM

Here is the datasheet of the CD4027BC dual J-K flip-flops are monolithic complementary MOS (CMOS) integrated circuits constructed with N- and P-channel enhancement mode transistors. Each flip-flop has independent J, K, set, reset, and clock inputs an > read more

The experience to Buy the components at

09/25/2014 02:47:47 AM

Sometimes I can not buy electronic devices. Because, far from an electronics store. No products you want, or expensive. I always use the online order. I envy my friends who live in America. That they can order electronics from There are a > read more

Simplest slave flash trigger circuit

09/24/2014 10:23:42 AM

- This is a simplest slave flash trigger circuit. - It will help the slave flash immediately works almost simultaneously with the main flash. - This circuit better than others circuits because without the external power supply. - Since (look at circu > read more

Power Amp Super Bridge 120W by IC TDA2030

09/23/2014 04:14:35 AM

This be Super Bridge 120W Power Amplifier by IC TDA2030 for you like the circuit amplifies that use the integrated circuit. and Transistor BD249 or TIP31 or TIP41 or C1061 and BD250 or TIP32 or TIP42 or A671. It is nice circuit and easy to use. Schem > read more

Inverter 12V to 220V 100W by Transistor

09/19/2014 03:45:46 AM

This circuit is 100 watt power inverter using power transistor 2N3055. It is designed for you that need to use appliances at outdoor or no electrical places. Someone use it in car or the high mountain etc. The maximum output power of this circuit abo > read more

555 audio ohmmeter circuit

09/18/2014 10:24:16 AM

555 audio ohmmeter circuit This is a 555 audio ohmmeter circuit. Some times, we need to measure roughly the resistances only. In this we can know the resistances by the audio so also fast check. This circuit will use the resistors that unknown value > read more

Wien bridge oscillator circuit

09/17/2014 10:49:09 AM

This wien bridge oscillator circuit which is normal,low distortion and can easily adjust the resonance frequency that depends on the pair of the resistors (R) and capacitors (C). Which we can calculate by the formula. F = 1/2 p RC In this circuit as > read more

3000 watts Dimmer for Inductor Load

09/13/2014 09:19:34 AM

This is the 3,000 watts Dimmer for inductor load example: the Electric Fan, AC motor,Electric drill etc. But most general dimmers is used for resistors load only such as lamp, soldering iron, heating coil,etc. Why our project can do? The normal dimme > read more

Multiples ways to increase the power supply current

09/11/2014 19:48:11 PM

If a DC power supply not enough for your job. The most cause come from the lower current of the transformer,which changing them is hard and expensive. This way maybe help you! Since the most transformers always is the center trap form for a dual powe > read more

Easy Telephone Amplifiers circuit

09/11/2014 00:32:22 AM

This is an easy telephone amplifier circuit. It will increase the signal of the telephone lines up. Then, drive the relay to controls the large electric bells that louder than a general phone. This circuit is modified from the speaker protection circ > read more

IC regulator protector circuit when load short

09/09/2014 21:32:29 PM

Today I have a little idea is the ICs regulator protector circuit in a load short-circuit. We design for the 12 volts DC regulator only. For example: IC-7812, or others 12V power supplies. How it works Figure 1 is the circuit diagram In the circuit, > read more

200-360 watts class G MOSFET Power amplifier

09/09/2014 01:18:25 AM

This is the Class G MOSFET power amplifier which is high end for all your jobs. It have more feature, - maximum RMS output power: 200 watts at load 8 ohms or 360 watts at the load 4 ohms. - The frequency response range: 10Hz.-150kHz. - Minimum harmon > read more

TDA2822 stereo amplifier circuit with pcb

09/07/2014 10:38:20 AM

This circuit stereo power amplifier. By use integrated circuit number TDA2822 within be model Dual Amp give power watt at 1W +1W bandwidth expansion rates at 40dB 120kHz use power supply since 1.8V to 15volt and use current 6mA feed power supply 9vol > read more

How to increase currents of a transformer

09/06/2014 02:04:51 AM

If your the transformer too low current, until you cannot use fully it. It is a pity if you need buy the new transformer. So let’s look at how to modify it to increase current up. But the transformers must be the center trap type as Figure 1, s > read more

Simple 12 LED running using CD4017 and NE555

09/05/2014 08:48:59 AM

Here is a simple 12 LED running circuit that use CD4017 and NE555 as based of circuit. It like the two way 12 LED running lights using CD4017 and NE555. Which it use 12 LEDs only. There are a interated running form. To begin with LED flash from the c > read more

Automatic Reverse polarity switch by Relay.

09/04/2014 02:13:08 AM

This circuit is an automatic reverse polarity switch. If we apply DC voltage to a any electronic circuits in wrong polarity. It can be caused by too much current. You must waste time to reverse the new terminal. If your circuit is importance, letR > read more

Diode tester circuit using IC-741 and LED

09/02/2014 12:56:05 PM

This diode checker circuit can check the diode the good or bad and also can indicate its polarity. How it works In Figure 1, There are IC1, R1, R2, R3, C1 include as the oscillator circuit that generate the square wave out to pin 6. This signal will > read more

Low noise tape head preamplifier

08/31/2014 23:39:07 PM

This is a low noise tape head preamplifier that good sound quality. Because use LM387N that is the low noise ICs and is designed for the specific preamplifier. Figure 1 is Circuit diagram of this project. Maximum the output at 1 volts which is is hig > read more

Simple variable dc power supply 0-30V 2A for beginners

08/30/2014 06:18:13 AM

If you are beginners who want to use the simple variable DC power supply 0-30V 2A. This circuit is best for you. Because it has a few parts,small,and cheapest than others circuit that same power. The features of this handset is the DC voltage continu > read more

200 watts super bridge power amplifiers

08/28/2014 20:30:52 PM

This is a 200 watts super bridge power amplifiers, include the transistors as based of circuit, so suitable for signals from the bass guitar. It’s a high power, durable and cheap. Use it in the house, the sound quality also is good. In Figure 1 > read more

Active microphone preamplifier using LF356

08/26/2014 22:36:43 PM

This is an active microphone preamplifier circuit for the particular condenser microphone. Generally, the condenser microphone has high sensitivity and the high output signal more than the other types microphone, but this type need to have a power su > read more

LF356 JFET Input Operational Amplifiers

08/25/2014 23:04:08 PM

LF155/LF156/LF256/LF257/LF355/LF356/LF357 FET Input Operational Amplifiers These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET Tec > read more

AN6780-General Purpose Long Interval Timers

08/24/2014 03:03:23 AM

The AN6780 and AN6780S are ICs designed for general purpose long interval timers. They consists of an oscillator, frequency divider (flip-flop 15steps), output circuit, and power circuit. A cycle can be freely set with the external resistor (R T ) an > read more

2 transistors Microphone preamplifier

08/23/2014 09:50:43 AM

This is a simple microphone preamplifier circuit that use 2 transistors are connected in the direct coupling, to respond the signal even better. How it works In Figure 1 the circuit diagram On collector of Q2 will feedback signal to the emitter of Q1 > read more

Modify Acoustic into the electric guitar on FM wireless transmitter.

08/22/2014 08:58:16 AM

This circuit is used to Modify an Acoustic into the electric guitar on FM wireless transmitter system. It is small, cheap, easy to build. The acoustic guitar pickup of this circuit like working of the condenser microphone. Which is good because This > read more

LM380 2.5W Audio Power Amplifier

08/21/2014 00:41:03 AM

Many circuit use LM380 Why? and hot to use it. I find datasheet at NT is good ICs. below is short datasheet that you can use it on basic. The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain > read more

How to use normal multimeter to measure high AC current.

08/19/2014 02:10:08 AM

A general cheap analog multimeters will not have directly AC current ranges.  But we are an Electric Appliance Repair, will always have this problem. For example: Measuring current of the electric appliances. How to modify our meter? We can modify t > read more

The parts you need.

08/17/2014 23:00:50 PM

Now that I am older,bad memory. It is slow and may be faulty. Ancient people used to say that when do not remember, so must be noted protect to forgetting. Thus I will write this article to me. but not only me It may be useful to everyone. Switches S > read more

Logical guessing game circuit

08/17/2014 22:27:57 PM

This circuit is the logic guessing game circuit use the digital ICs as base of projects. They are used for playing, with 2 players, the first will set logic, and second guessing logic. The code in this circuit is 4 switches. If a player can guess the > read more

Low noise pre tone control circuit using NE55532

08/15/2014 01:14:08 AM

This circuit is a pre tone control using NE5532. In a three circuits of preamp tone controls by NE5532 is a very popular. But it has details are not clear. We recommend the low noise pre tone control circuit instead. We use the a NE5532 is heart of c > read more

6 ranges AC millivoltmeter circuits

08/14/2014 00:58:09 AM

Sometimes, we need to measure very tiny AC voltage and also high frequency. We cannot use a general meter. How it works This circuit can easily measure the very tiny AC voltage and high frequency 100 Hz to 500 Khz. Use an op-amp is the input is mosfe > read more

300 watt – 1200 watt MOSFET Amplifier for professionals only.

08/13/2014 02:35:15 AM

When you need an amplifier with high watt power. For use in applications such as concert, theater, the festivals etc. This circuit is most suitable. Both Loudness and durability, that courage to try. Note: Today I edit pcb layout to clear view. For t > read more

Idea to build simple frequency meter from old calculator

08/11/2014 20:11:32 PM

This circuit use a simple ideal is the calculator count a frequency within range 1 second. This time base is generated by IC-555,on astable multivibrator form. How it works The number on the calculator’s panel is the input frequency. to base of > read more

Modify a LED chaser circuit into the easy timer

08/08/2014 09:14:15 AM

The a LED chaser is popular, so we will modify it into the easy and cheap timer. First,a appliance will works, while respective LEDs will flash, and until all LEDs go out. Then the appliance stop. How it works. In Figure 1 is the circuit. To begin wi > read more

The light meter circuit using a general diode

08/06/2014 22:03:39 PM

This is a simple light meter circuit using normal diode as a sensor and show amount of light by a any voltmeter. The light can change the properties of many devices, example.. LDR as photo resistors can change resistance by light. Photodiode- like LD > read more

Modify AC Dimmer to automatic light switch controller

08/04/2014 13:55:26 PM

Way to modify an AC dimmer into a light switch circuit, to turn ON-OFF and automatic light dimmer or two in one form. Since, the general dimmer uses a triac to control a load like a relay contact. So we can easily make it by a few parts. The automati > read more

AC lights dimmer using triac

08/02/2014 07:10:46 AM

This circuit has can to turn down a light bulb arrives at 100W. If Triac there is tall temperature should hold Heat Sink or let off the heat. The Diac be diode that perform be formed encourage or Trigger Diode 2 kinds are way or Bidirectional. The VR > read more

Motor burn out and under voltage protection

07/29/2014 00:33:14 AM

This is AC motor burn out protection causes of under voltage input. The principle is simple, it will check for voltage at all times. Normal voltage is 220V AC. If the voltage falls below a preset. Relay will not work and the LED is a warning. Can be > read more

Simple sound effect generator circuit using IC-555 and IC-4017

07/26/2014 12:49:24 PM

If we want to be a producer,This circuit would be a good starting point to composed music for 1000 tracks. As Figure 1 is a common circuit. Which will see them always when use LED running. We will use an IC-555 timer and IC-4017 Decade Counter Divide > read more

Simple guitar fuzz effect circuit using IC-741

07/26/2014 03:02:26 AM

In play guitar or other instruments. Sometimes people just want to be a sound of unusual instruments, from some common. and this fuzz effect circuit or crack, it is the circuit that is commonly used characteristics as shown in Figure 1. How this circ > read more

Sound detector using LM324

07/25/2014 22:09:11 PM


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