Top Circuits Page 165
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Figure shows a great project / schematic of a 12V solar LED night activated lamp circuit. This is a versatile project and can be used for variety of purposes. For example you can use it as a great automatic solar garden light and this can be done easily by....
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Here is a very simple and useful project / schematic of a 12V to 3V converter circuit. The output current of the circuit is around 1A....
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This is a circuit of a 12V to 5V converter using a 7805 regulated IC. In the previous article we have discussed about the circuit of 12V to 9V converter which can be used to convert any source of 12V DC to 9V DC using 7809 IC. The circuit mentioned here is....
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This power supply will work accurately where you have the need of stable 18V DC and provides current upto 1. 5A. The circuit is using a LM7818 positive voltage regulator IC. This IC has many built in features like internal current limiting, short circuit....
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Schematic diagram and description of 2 watt audio amplifier circuit using TDA7052 amplifier IC. This is a super simple audio amplifier circuit. ....
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Here is the circuit of 20W audio amplifier using LM1875 IC. LM1875 is a very high quality low distortion 20 Watt audio amplifer IC available in TO-220 package. This IC has many built in features like thermal shutdown, current limiter, high gain, high current....
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A 24V DC power supply circuit using LM7824 IC. LM7824 is a 24V 1. 5A fixed output voltage regulator IC, available in TO 220 package. It is an IC of LM78xx series, this series contains many fixed output voltage ICs like LM7815 is designed for fixed 15V output....
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Here is a schematic of a simple 555 organ circuit. The circuit is consist of two parts first 555 circuit of organ and second lm386 amplifier for driving 8 ohms speaker. The circuit will generate slightly different tone by pressing each switch from S1 to S7....
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A project of a 555 tester circuit, the circuit will start blinking LEDs when power is applied which will indicate that the IC is working correctly....
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The schematic shown below is a 555 timer circuit. NE555 is a famous IC comes in 8 pin dip plastic package. There is a huge list of 555 IC circuits due to which this IC is very popular among electronics hobbiests, students and experimenters. The circuit....
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This is a 555 tone generator circuit based on NE555 timer IC. NE555 is a very famous IC used in many circuits and performs variety of tasks. In this circuit the IC is used as an astable oscillator and the circuit will generte a tone when power is applied.....
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The schematic shown here is a circuit of a 555 tracking transmitter. 555 is a famous versatile IC used in many electronic projects. In the below mentioned circuit this IC is used to generate a tone which will be transmitted through the FM transmitter circuit....
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The circuit is using a 230V AC OR 110V AC to 9V-0-9V step down center tapped transformer to step down the mains voltages. Four 1N4001 diodes are used for rectification of the AC voltage to DC. A 2200uF / 25V electrolytic capacitor is used the filter the....
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Article about full automatic 6V 4.5AH battery charger circuit with schematic using IC LM317T and few components. The circuit can charge 6V lead acid battery. ....
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Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is MK484 AM radio IC. It is a high sensitivity and high quality IC, it has only three leads and comes in TO92 package and require only few external parts because all....
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In previous article about how to make a radio we have discussed a simple crystal radio receiver circuit. The schematic mentioned here is also a simple AM radio circuit but it is not using a crystal, it is using high gain preamplifier stage of transistor BC....
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Now day`s audio signal preamp is used in many electronic devices. There are many types of audio preamp circuits from simple to complicated big circuits. Here we are showing you a very good design of a small circuit of signal preamplifier. circuit is best for....
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Here is a project of a simple automatic night lamp circuit or dark activated 230V lamp circuit, which will automatically activate an AC lamp / bulb when sun set or if the circuit will receive no light. The circuit is very easy to build using no more than....
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Schematic and description of simple automatic NiMH battery charger circuit using IC 7805 with multiple selectable current options for charging. ....
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Schematic of an automatic solar garden light circuit with 10 super bright white LEDs which will automatically activate at night. ....
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Here is a battery monitor circuit which can be used to monitor the voltage of 12V lead acid batteries such as car batteries. The circuit is built around the LM3914 IC and some external components with 10 LEDs which will indicate the voltage level. Two....
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Here is a schematic of a beeper circuit. The circuit will generate a continuous beep-beep sound signal with flashing an LED....
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This is a project of a ding dong door bell circuit using 555 IC. In the previous article we have discussed about a simple doorbell circuit using UM66 IC which is a CMOS three terminal melody IC. The circuit mentioned here is using NE555 IC and few other....
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This is a project of a 555 buzzer circuit. NE555 is a timer IC comes in 8 pin dip package, it performs wide variety of tasks in electronic circuits. The circuit mentioned below will produce a buzzer sound when 9 volt power will be applied. The frequency of....
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This is a schematic of a cable TV signal booster amplifier circuit which can be used to amplify or boost the signal of cable TV system. Use 75 Ohm coaxial cables at the input and output of the circuit and fit the circuit in a metal case. The bandwidth of the....
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A car battery charger schematic & description . This 12v automatic car battery charger circuit can be also use for charging other automobiles batteries. ....
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The schematic shown here can be used as a circuit for Car brake light or headlight flasher for flashing two 10 watt 12 volt lamps in car or any vehicle. ....
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A very simple and interesting project / schematic of a cell phone signal activated LED circuit. The circuit will light up an led when you call from your cell phone....
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A very useful project of a crystal tester circuit or xtal tester circuit built with only few components the circuit form an oscillator that will only oscillate if the under test crystal is in good working condition and the oscillator output voltage will be....
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Here is a project of a simple dark detector LED circuit. In the previous topic we have discussed a light activated LED circuit. By simply changing the positions of the resistors and LDR we have converted the circuit in a dark detector LED or dark activated....
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Here is the project/schematic of LM741 dark sensor relay switch circuit. The circuit will activate the relay switch when there is no light on the surface of LDR....
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This simple DC motor control or PWM circuit using 555 IC can be used to control the speed of a DC motor. The circuit is very simple and can be built in very short time if all parts are available with you....
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Here is a easy circuit of a DC to DC converter using LM317T IC. LM317 is a very famous IC comes in TO 220 package. This high performance IC has a lot of good features like input supporting voltage from 3 to 40 volt DC and delivers regulated output from 1. 25....
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Here is the schematic of a simple DIY solar cell phone or USB charger circuit. This solar USB battery charger circuit can be used to charge any device, which can be charge from computer USB port. For example MP3 players, cell phone, iphone etc. The circuit....
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Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC which is a great and very famous melody IC, comes in TO-92 transistor package. The IC has only three pins and it is a complete melody system requires no external....
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Field strength meter circuit is a very useful device for measuring the RF output of any transmitter or experimenting different antennas with the transmitter. The work of the field strength meter (FSM) is simple it converts RF energy in to DC voltage and this....
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Here is a very simple and useful project of a moisture level LED Meter circuit that can be used as a sensor or detector to measure humidity or moisture level in plants, soil, wood, wall, floor etc....
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A very interesting schematic of Flip flop LED flashing circuit. The circuit actually is an astable multivibrator which starts blinking LEDs one by one when power is applied. This LED flasher circuit can be operated with any voltage from 6 to 12 volts, you....
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A very useful, easy and interesting project of a flip flop relay circuit using a 555 IC. The circuit will continously flip flop or on and off two relays one by one. ....
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Here is a schematic of FM, AM/MW and SW antenna amplifier circuit or we can also say it antenna preamplifier circuit which can be used to increase the faint signals of FM, AM/MW & SW bands. The circuit is very simple and easy to build using only one....
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Below is a schematic of a tunable FM antenna booster or FM antenna amplifier circuit which can be used to amplify the faint or distant FM signals. The circuit is using two transistors to increase signal gain to good level. The transistors are general purpose....
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TDA7000 is a famous FM radio receiver IC also called one chip FM radio receiver covers VHF FM band from 70 to 120 MHZ. This IC was first introduced in 1980`s and gained very popularity in the electronics world and it is still very popular after 31 years. The....
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A good quality FM stereo transmitter circuit schematic using ba1404 fm transmitter IC. Easy to build circuit with only few external parts....
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Here is a simple and easy to make heat or temperature sensor alarm circuit. A good feature of this circuit is that it will produce beep-beep sound and flashes an LED according to the temperature....
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Here is a very simple infrared detector circuit which can be used to detect infrared light. The circuit is consist of only three components a RS-276-145 photo transistor, 330 Ohms resistor and a general purpose LED (Light Emitting Diode). When the photo....
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The circuit mentioned here is a small easy to build Intercom circuit using one LM386 IC one 2N3904 transistor and few other components. LM386 is a very famous amplifier ICs mostly used by electronics hobbyists in audio circuits. In this circuit the 8 ohms....
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A very good quality and simple intercom circuit using only three transistors. By pressing the switch S2 the circuit will generate ring signals. For making two way intercom make two identical circuits and combine them as shown in diagram 2. The current....
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Our eyes are very sensitive to light but they cannot see the IR (Infrared) radiations so it is some time difficult to test or check the equipments which emits infrared to confirm that either they are working or not. So here is the IR detector circuit which....
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This is a very simple and easy to make IR receiver circuit. This infrared receiver circuit is using only few components and it is able to receive 38KHz carrier signal. The working of this circuit is simple when ever the IR LED receive any signal from 38KHz....
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This is a schematic of a IR transmitter circuit using IC. The IC used in this circuit is a famous timer IC NE555 which is working as an astable multivibrator in this circuit and producing a 38KHz frequency signal. The circuit starts to produce the signal....
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This is a simple two transistor lamp flasher circuit, which can be used to flash 6 volt lamp. The circuit is so small and can be easily fitted in a small box. The circuit is using two transistor one is NPN BC549 and the other is PNP BC556. The input voltage....
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Lead acid battery charger schematic using IC LM317. This lead acid battery charger circuit is simple to build and can be fit in a small box. ....
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Here is a very easy and useful schematic of an LED dimmer circuit. The circuit is using a famous voltage regulator IC LM317T. This IC can also be used as a current regulator, like it is used in the following circuit. In this circuit we have used 10 super....
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Here is a simple LED night light circuit which can be used as a room night lamp. The circuit is simple and can be built with few components. The circuit is using four LEDs to perform as a night lamp. You can use blue or white colour LEDs or any other colour....
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Here is a circuit of a LED sequencer / chaser using CD 4017 and NE555 IC. CD 4017 is a CMOS counter IC consist of 16 pins. This IC gives 10 outputs according to the clock pulse it receives from the clock input, which is pin 14. The another IC used in this....
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This Led table or reading lamp circuit can be used for many purposes for example as a reading lamp for bed, desktop or table lamp, keyboard lamp (to view keys of your computer keyboard in dim light), as an LED emergency light in the absence of AC supply, as....
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This article describes a circuit of simple single cell li ion battery charger or lithium ion battery charger. Using the LP2391 regulator IC....
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The schematic shown below is a circuit of light activated LED using SCR. SCR (Silicon Controlled Rectifiers) or thyristor are physically looks like transistors but their internal circuit and working procedure is totally different as compare to the....
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A simple and interesting project of a light activated LED circuit, which will light up an LED when receives light. The circuit is very easy to build and using only six components. The photoresistor is performing the light sensing task. The transistor 2N2222....
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This simple light intensity meter circuit can be used to determine the intensity of light in a wide variety of electronic projects and experiments....
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This is a light sensor circuit which will detect light and switch on the relay. This light switch circuit is very simple and using only few components. Working of the circuit is simple, when the photoresistor receives light it will switch on the transistor....
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LM 317T power supply circuit. This power supply is very simple and timeless, contain very few components and will give very stable, regulated adjustable / variable output....
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This is a long range stable FM transmitter circuit. The circuit is using a LM2950 5V voltage regulator IC comes in TO 92 transistor package, which will provide a stable 5V to the oscillator till the 9V battery runs down to 5. 5 volts, due to which the....
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This is a project of a simple metal detector circuit. The circuit is easy to build using only one transistor and few other components. The circuit is a colpitts oscillator which boradcast on AM band. Take a good quality am receiver and place it near this....
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The figure shows an easy project / schematic of a metronome. A metronome is a device that is used by musicians. The circuit produces continues beats in the speaker....
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Here is a schematic of a very sensitive microphone preamp circuit, which can be used to increase gain of microphone or boost the audio signals coming from microphone. The circuit is very simple contains only few components and can be assembled in few minutes....
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A project of moisture sensor alarm circuit it can be for detecting moisture in plant soil, wood, irrigation areas etc....
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A very interesting project of a light activated alarm or morning alarm circuit. The circuit will produce a beautiful melody when it will detect light. You can use this circuit as a morning alarm, for this purpose first select a permanent place in your home....
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A project of a morning / sunrise alarm circuit which will produce a beep-beep alarm sound and flashes an LED according to the sunlight....
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Car Mp3 FM transmitter circuit. This circuit can broadcast any audio to FM receiver. It has a good preamplifier circuit so the broadcast sound quality is good....
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Nicd battery charger schematic and description. This Nicd battery charger circuit can charge 12V, 6V, & 9V battery packs. ....
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The circuit is able to charge 2. 4V, 4. 8V, and 9. 6V NiCd batteries. The LM317T IC showed in this NiCd battery charger schematic is use to regulate the voltage to battery charge the NiCd batteries as you know that the LM317T IC is a very popular IC from....
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Schematic and description of a simple and easy to built NiCd and Nimh battery charger circuit which is able to charge multiple NiCd and NiMH batteries. ....
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get it on and off continuously. The circuit is using a well known NE555 timer IC which is a very famous IC due to its uses in the wide variety of electronic circuits. In this circuit this IC is connected as a astable multivibator and the 12 volt relay is....
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Here is a one transistor LED flasher circuit which will flash a super bright LED. The circuit is using single transistor as driver which is taking flash rate from the LED 2 which is a self flashing LED. The flash rate can be adjusted by changing the value of....
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A very simple and useful project of soil moisture circuit. The circuit is using only four components and a 3 volt battery. The circuit will detect if there is water in the soil of any plant and light up the LED. The resistor R2 is a potentiometer to adjust....
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The schematic shown here is a circuit of plant watering watcher or dry soil detector. The plants located in your home or office wants more care as compare to the plants outside. We often forget to water the plants in our home and offices due to load of work....
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A 12 volt relay is connected between the two stages in a way as when it will get 12 volts from the supply it will get activated and disconnect the 3 volt DC supply from the melody circuit and in the opposite condition when mains power is absent it will....
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A rain sensor alarm circuit can be a very beneficial device for alerting when rainfall happens. The rain detector circuit shown here is very simple using only three components but is very sensitive to detect rain or moisture. The sensor part of the circuit....
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In this circuit the 555 Timer IC is connected as a astable multivibator and a 12 volt relay is derived through the pin 3 of the IC. The IC generates continues pulses at pin 3 which will activate and deactivate or flash the relay accordingly. The flashing....
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Here is a remote tester circuit or remote checker circuit which can be used to test TV and other remote controls. The circuit is very simple using only few components. The infrared sensor used in the circuit is TSOP1738. When the IR waves received by the....
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Like field strength meter an RF detector circuit is also a useful project to detect a nearby RF signal. The circuit shown here can be used to detect wide band of RF frequencies and provide an alarm when it will detect an RF signal....
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The figure below shows a schematic of a very interesting sensitive mic circuit which will boost faint sounds from distance. The circuit is quite sensitive and provides good gain to weak audio signals....
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Schematic and description to make fm transmitter. It is a simple fm transmitter circuit with minimum components but it has a long range. ....
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Schematic and description of a simple mic amplifier circuit. This circuit contains two stages first microphone preamplifier and second audio amplifier using LM386 Amplifier IC....
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Here is a project of a simple touch switch circuit. This circuit and can also be used to activate a relay in the place of LED and resistor. The circuit is quite sensitive because we have used the two transistors as a Darlington pair. The gain is first....
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Here is a simple water level buzzer circuit which can be used to detect or sense the level of water in tank, pool, washing machines etc. When the two probes shown in this water level indicator circuit will detect water the buzzer will start producing sound.....
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A simple water level sensor or liquid level detector for measuring or detecting a required level of water, liquid, fluid in a tank, pool, well, aquarium, washing machines etc....
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Here`s The schematic shown below is a simplest LED flasher circuit. The circuit is using three LEDs which will start blinking or flashing when we provide 9 volt to the circuit. The circuit is so simple it uses a self flashing LED (LED 1) to make all LEDs....
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This is a simple electronic siren circuit, which can be used in many circuits where the need of siren is required. The circuit is very simple using only two transistors and few other components and it will generate siren sound when power is applied. Use 8....
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Solar battery charger schematic & description. This solar battery charger circuit can charge 12v lead acid battery or sla battery. ....
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There are many techniques to make an FM transmitter stable so it will not change its frequency as the battery runs down. The rf circuit shown below is a mini stable FM transmitter which is using a zener diode to provide accurate voltage to the oscillator....
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Here is a very useful project of an automatic street light or lamp circuit which can be used to activate your outdoor lights like garden lamps, night lights etc. automatically when the sun set and turn off automatically when the sun rises. The circuit is....
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A very simple and easy telephone line tester circuit or telephone line checker circuit which can be used for testing telephone lines. ....
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transistors as a darlington pair. The circuit is also using a thermistor to detect or sense the heat. A 12K variable resistor is used to adjust the activation of the buzzer on the desired temperature. Working of the circuit is simple when the thermistor will....
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A Thermistor is used in the circuit for sensing the heat and two 5K variable resistors are used to adjust the circuit to activate the relay on the desired temperature. The purpose of using the 1N4007 diode across the relay is to limit the back EMF of the....
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The schematic shown here is a project of a simple temperature sensor circuit or we can also say it a heat sensor circuit, which will activate an LED when receive heat. The circuit is easy to make and using only few components. The two BC547B transistors are....
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on the desired temperature. The circuit can be used for many purposes for example switch on the fan on the desired temperature or activate emergency temperature alarm etc. The circuit can be powered by a 9 volt battery, adaptor or transformer. The two BC547B....
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Here is a very interesting project / schematic of a touch alarm circuit. The circuit is quite sensitive and it will activate a peizo or any other buzzer and an LED for a set time period when any one touches the metal plate....