New Circuits Page 29
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The input transformer is likely to be the most expensive part of the entire project. As an alternative, a couple of 12 Volt car batteries could be used. The input voltage to the regulator must be at least several volts higher than the output voltage (12V) so....
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A subsonic filter is mostly used in low frequency technology. Most often, the very low frequencies create distorsions in music recording or reproduction. T....
-
This circuit features a timed output and automatic reset. It can be operated manually using a key-switch or a hidden switch. By adding an external relay, it will set itself automatically - and/or immobilize the machine - every time you turn-off the ignition.....
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How to connect and program the Arduino/Atmega168 microcontroller to operate a unipolar stepper motor....
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-
-
This is a simple PWM modulator circuit. Comparing the message signal to a ramp or triangular waveform is the simplest way to produce a PWM signal. When the....
-
The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
-
This circuit is a small digital ?roulette``. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from one power supply....
-
-
Some ultrasonic range finders for my project. But most of the commercial sensors like Parallax`s PING sensor and other similar products are quite expensive, especially if multiple units are needed. So I thought why not building it myself The theory behind....
-
-
Magnetic stimulation is a non-invasive method of stimulating the brain and peripheral nervous system using induced currents. When used to stimulate the brain it is normally referred to as Transcranial Magnetic Stimulation or TMS. The basic principle is shown....
-
The one-arm bandit circuit is made up of three clock circuits and three counter/readout circuits. A single roll switch, 51, turns on all three clocks at the same time. When S1 is closed, capacitors C4, C5, and C6 are charged through D31, D32, and D33 to....
-
The photometric camera for the SDSS consists of two TDI scanning CCD arrays, one, using 30 Tektronix/SITe 2048 x 2048 CCDs in a 5 by 6 array for five-color photometry, and the other using 24 2048 x 400 chips for astrometry and focus monitoring. We here....
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-
-
The following schematic shows how to Increase Output Voltage of a Fixed Linear Regulator Circuit Diagram using 3-terminal shunt regulators or references. The 3-terminal shunt regulators provide their precision function to turn the medium accuracy linear....
-
This making adopts the port as supplying power of USB mouth, carry on the information acquisition of the temperature with DS18B20 temperature sensor, control with AT89C2051 one-chip computer, adopts the common anode nixie tube of quad bit to reveal, thus....
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When the output of our multivibrator is low, Q1 (because it is NPN transistor) will be OFF and Q2(because it is PNP transistor) will be ON. So the negative terminal of capacitor C3 will be connected to ground. It will charge from the power supply and through....
-
This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
-
This is the giant controller used for the game Steel Battalion for the xbox. I used this schematic diagram from a guy called Alpha who did it to his....
-
-
What about the 10K resistors at the bases of the transistors, and the 1K resistors at the collectors. Keep those with theTransistors when I move them, orget rid of them If the 10K resistors are not included the transistors will blow-off, without the 1K....
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-
There is not much to this circuit. Above are all the graphics and pictures. After you gather all your materials, take your transistor and wire it up....
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The Amplifier circuit can be made with an IC power amplifier LM1875. IC LM1875 is a single chip power amplifier from National. 20 watts audio amplifier with LM1875 is a low power amplifier with good quality to the room. To assemble the amplifier 20 watts....
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150W power amplifier circuit diagram based power transistor TIP41/TIP142/TIP147.It is easy enough to built without PCB. The power output range is about 100-150W...
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One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors,....
-
555 Timer Time Delay Circuit LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes....
-
The CA3217E contains all required circuit functions between the video detector and picture-tube RGB driver stages of a color television receiver. The CA3217E decodes the chroma signals and then produces three different color signals that are internally....
-
-
The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether it be man made interference or static. In this design the RF signal is first met by a resistive....
-
A USB port, in practice, is capable of supplying more than 100 mA of continuous electric current at 5V to the peripherals which are hooked up with the bus. So a USB port could be utilized, without having any problems, for powering 5V DC operated tiny....
-
The under/over voltage protection circuit with time delay presented here is a low cost and reliable circuit for protecting such equipments from damages....
-
This circuit diagram of digital clock uses six common anode seven segment displays to show the time. It needs neither micro controllers or PIC for it`s operation. It`s a MM5314 IC driven digital clock operating at 50 Hz or 60 Hz, and 12 or 24 hour display....
-
Speed test circuit reaction of is simple planning. This circuit functions for game to test speed reaction of a man. Mode of the action of this peripheral is hardly easy to be comprehended. This thing is caused by this peripheral only lapped over by some....
-
Schematic diagram in hard copy relating to the computer CSIRAC. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common....
-
A vibration meter circuit shown in the following schematic diagram uses LM3915 a the main active component. This vibration meter uses a piezoelectric....
-
The circuit can be used for switching OFF a particular lamp or group of lamps in response to the varying ambient light levels. The unit once built can be used for switching OFF a lamp when dawn breaks and switching it ON when dusk sets in. The power supply....
-
-
Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection Well, this simple circuit should put an end to that. It signals that the phone is in use by lighting a red LED. When the phone is not in use, a green LED....
-
Design a lighting circuit for an indoor garden, and I`m not understanding things that seem like they`re really basic, so I need some help. The schematic I`m referencing is: I have a 24V input source which I`d like to limit to 20V. LA is a series array of....
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The IC LM338 by TEXAS INSTRUMENTS, is a versatile IC which can be wired in numerous different ways for obtaining high quality power supply circuit configuartions. The first circuit shows the typical wiring format done around the IC. The circuit provides an....
-
-
design of the circuit and coding for the project`s stepper motor controller, the development of the circuit and coding for the speed-controlled DC motor for the project`s propulsion system, the circuit and coding for the system`s navigation system using a....
-
-
This is a circuit that is used to menhidupkan LED with voltage 230Volt, 230Volt it so that the voltage must be lowered in accordance with the needs of the LED itself. To lower it even necessary circuit as below...
-
This car stereo booster uses an LM2896 IC which has two integrated amplifiers. It can be powered with voltages up to 15 volts. The power output is 2. 5 watts per channel with an 8 © load and supply voltage of 12 volts. Using the bridge tehnique in the....
-
Here is one of the interesting 555 timer circuits to trick your friends while studying electronics in schools. Clap switch circuit is the local name of sound controlled flip flops. This sound controlled light can also be used as sound detection sensors. Flip....
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Cool little FM transmitter. Suitable for study purposes, you can use the RF part of this transmitter easily for your projects. However, unless you know how to build a serial data link and connect this LPFM transmitter to a PC or a microcontroller, you won`t....
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The 555 Ic is wired as an astable and the frequency is constant and independent of the duty cycle, as the total resistance (R charge + R discharge, notice the diode) is constant and equal to 22Kohm (givin a frequency of about 1Khz, notice the hum). When the....
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Power is supplied by continuous voltage, not always stabilized (applied to PWR + and -) at a value between 5 and 32V; such voltage is filtered at the bottom by the diode protecting against polarity inversion (D1) through condensers C1 and C2. Fuse F1 enables....
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-
IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components. There are several examples of applications....
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-
-
-
All types of transistors including Darlington and power will be tested in this project. Connect the 9v battery around the other way at points A and B to test....
-
The following circuit shows about BC 547 Transistor For Garage Alarm Sensor Circuit Diagram. Features: simple single-zone burglar alarm circuit, ....
-
With this Stereo FM Transmitter with BA1404 you will be able to create a mini stereo FM station and broadcast to your entire home, a simple way to have an audio link wireless with ease. With the FM transmitter BA1404 Hifi Stereo you can stream your music....
-
This is the complete circuit of the modern homodyne receiver. This receiver can receive AM CW and SSB transmissions...
-
By developing a low-noise frequency synthesizer at 2 GHz and applying a pair of doublers, it is possible to achieve low-phase-noise outputs past 8 GHz for digital microwave radios....
-
-
When my girlfriend and I moved into our small apartment in San Francisco we wanted to setup some sort of compact liquor cabinet and wine rack. After a quick trip to IKEA we had a bookshelf we could easily convert into a fancy boozeshelf unit! *insert music....
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The head will be powered by servomotors and will be built from sheet plastic, metal or plywood. The template which can be used for cutting sheet material can be found at the end of this article. Download the template, compare the size of the printed....
-
The circuit shown in the chart is 1kHz sine wave oscillator circuit. Basing on the double-T circuit, the circuit using 741ordinary operational amplifier to produce 1000Hz sine wave output. Adjusting 100k? potentiometer will make circuit start oscillation,....
-
This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will be given in order to suit different needs. The circuit as shown in the diagram....
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-
Powering the LED with a 3V CR2032 battery and hoping I could extend the battery life by making the LED blink instead of having it on all the time. The 555 timer one, with large value resistors in the voltage divider, is probably the best. It might need an....
-
The NL3ASD Schematic Pages - Here Can You Find The Schematics Of A Schematic Of A LED VU Meter With The UAA180....
-
-
Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of the mobile phone battery packs have a rating of 3.6V, 650mAh. For increasing the life of the....
-
The oscillator that is composed of the quartz crystal can be divided into two kinds: the parallel resonant type crystal oscillator and the series resonant type crystal oscillator. The parallel resonant type crystal oscillator and the AC equivalent circuit of....
-
This high power audio amplifier will give you top class quality for loudspeaker 4 – 8 ohm. Frequency range 20-20000Hz, Voltage 24-36V with current max 5A. You need heatsink to keep the transistor from overheating. ..
-
General purpose hobby circuit of a simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply can power the whole circuit.Working of this circuit is straight....
-
-
So far, we have considered the oscillators which use L-C tuned circuit that causes a phase shift of 180 ° due to inductive or capacitive coupling in addition to a 180 ° phase shift produced by the transistor itself. The oscillators employing L-C elements,....
-
The Ping Ultrasonic Distance Sensor by Parallax has three pins. These pins are +5V, I/O, and Ground. In order to activate the sensor, a 5 microsecond 5V signal must be sent to the I/O pin. The sensor then waits 750 microseconds before sending an ultrasonic....
-
The astable multivibrator is a unique form of the relaxation oscillator in which the in-phase feedback is provided by a separate transistor. The first multivibrator was built with vacuum tubes and the circuit was very popular from the start. Millions were....
-
basically i have what is known as a bite alarm (for fishing). normally bite alarms beep as the fishing line passes over a wheel which usually has notches in it to allow some sort of optical switching making it go beep-beep-beep until the wheel stops. however....
-
A microprocessor controlled shutter control-box for electrically driven shutters such as the MELLES GRIOT 04 IES 003 and others, such as the ILEX electric shutters. Older view camera lenses often come in shutters that have problems from use or age. Usually a....
-
This transmitter has a size about that of a large coat button. The transmitter accepts direct voice input and work on a single watch type button cell that serves several tens of hours together. As shown in schematic the transmitter is probably the simplest....
-
The Vc1 increases linearly when the pull-up resistor RA in the monostable circuit is replaced with constant current source, generating a linear ramp. The linear ramp generating circuit and the generated linear ramp waveforms illustration is shown in figures....
-
Here is a handy field strength meter that can be used to check the strength of AM radio signals. The circuit is a very useful for those who assemble radio transmitters(especially in the tuning of the final stage for maximum range). The circuit is essentially....
-
That circuit is similar in concept to the BK Butler/Tubeworks Tube Driver. Since there is only a 9v supply, the tubes operate in "starved plate" mode. Preamp tubes normally operate on 100v-300v. It`s similar to using a Variac on a tube amp. When there is....
-
This is the 200W lamp flasher circuit diagram. The frequency/speed of the lamp flashing can be adjust with the range of 1Hz to 5Hz. You can use the PR1 variable resistor (trimpot) to adjust the flashing speed. The duty cycle of lamp flashing can be adjusted....
-
This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
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The infrared detector module (GP1U52X) (Radio Shack 276-137) provides a 5 volt TTL pulse train corresponding to the digital code to the button of the remote control. In the lower circuit, the module output normally low a signal and a positive going pulse....
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This TDA2030 amplifier circuit is ideal for driving low frequency subwoofer speakers in home theater systems. The TDA2030 is a monolithic integrated circuit intended for use as a low frequency class AB amplifier. This TDA2030 amplifier design needs dual....
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This is a simple audio amplifier circuit fabricated around BEL1895 1W audio amplifier IC. This circuit is alternative of the complicated audio amplifier circuit for portable radio receiver. No driver circuit for loudspeaker is needed with the facilities of....
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A simple function generator circuit using LM1458 is known here. LM1458 is a dual general purpose operational amplifier. The two opamps inside LM1458 has a common bias network, power supply line and are independent of each other in operation....
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Some ten days ago I installed an all-linear automatic night light circuit to control the lights inside the living room. Circuit consists of three op amps-two used as voltage followers and a third as a comparator. As the schematic shows, all user adjustable....
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Basically, the circuit consist of two balanced. Simple BFO metal detector. BFO ( beat frequency Ready assembled and tested circuit board Chip in the center is Pic 12F675 Passive detector uses the detector coil in a frequency depended part of a circuit, This....
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On my mountain bike I always used to have one of those well-known flashing LED lights from the high street shop. These often gave me trouble with flat batteries and lights that fell off. As an electronics student I thought: this can be done better . First I....
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This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.....
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Pressing the pushbutton of the transmitter, a sound and/or light alert is activated in the receiver. The system uses no wiring or radio frequencies: the transmitted signal is conveyed into the mains supply line. It can be used at home, in any room from attic....
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Hi guys, I`m building a basic RC Car. There`s an LED in the receiver circuit which lights up when I press a button on the remote. But when I connect....
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The human eye is amazingly adept at tracking moving objects. The process is so natural to humans that it happens without any conscious effort. While this remarkable ability depends in part on the human brain`s immense processing power, the fast response of....
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This is my first AVR-project on this page. The DiSEqC-Tester allows to test DiSEqC-switches that uses 1. 0 or 1. 1 protocols. (DiSEqC-Switches with 2. 0 and 2. 1 protocol have backwards compatibility with 1. 0 & 1. 1 respectively and also may be tested). The....
The input transformer is likely to be the most expensive part of the entire project. As an alternative, a couple of 12 Volt car batteries could be used. The input voltage to the regulator must be at least several volts higher than the output voltage (12V) so....
A subsonic filter is mostly used in low frequency technology. Most often, the very low frequencies create distorsions in music recording or reproduction. T....
This circuit features a timed output and automatic reset. It can be operated manually using a key-switch or a hidden switch. By adding an external relay, it will set itself automatically - and/or immobilize the machine - every time you turn-off the ignition.....
How to connect and program the Arduino/Atmega168 microcontroller to operate a unipolar stepper motor....
This is a simple PWM modulator circuit. Comparing the message signal to a ramp or triangular waveform is the simplest way to produce a PWM signal. When the....
The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
This circuit is a small digital ?roulette``. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from one power supply....
Some ultrasonic range finders for my project. But most of the commercial sensors like Parallax`s PING sensor and other similar products are quite expensive, especially if multiple units are needed. So I thought why not building it myself The theory behind....
Magnetic stimulation is a non-invasive method of stimulating the brain and peripheral nervous system using induced currents. When used to stimulate the brain it is normally referred to as Transcranial Magnetic Stimulation or TMS. The basic principle is shown....
The one-arm bandit circuit is made up of three clock circuits and three counter/readout circuits. A single roll switch, 51, turns on all three clocks at the same time. When S1 is closed, capacitors C4, C5, and C6 are charged through D31, D32, and D33 to....
The photometric camera for the SDSS consists of two TDI scanning CCD arrays, one, using 30 Tektronix/SITe 2048 x 2048 CCDs in a 5 by 6 array for five-color photometry, and the other using 24 2048 x 400 chips for astrometry and focus monitoring. We here....
The following schematic shows how to Increase Output Voltage of a Fixed Linear Regulator Circuit Diagram using 3-terminal shunt regulators or references. The 3-terminal shunt regulators provide their precision function to turn the medium accuracy linear....
This making adopts the port as supplying power of USB mouth, carry on the information acquisition of the temperature with DS18B20 temperature sensor, control with AT89C2051 one-chip computer, adopts the common anode nixie tube of quad bit to reveal, thus....
When the output of our multivibrator is low, Q1 (because it is NPN transistor) will be OFF and Q2(because it is PNP transistor) will be ON. So the negative terminal of capacitor C3 will be connected to ground. It will charge from the power supply and through....
This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
This is the giant controller used for the game Steel Battalion for the xbox. I used this schematic diagram from a guy called Alpha who did it to his....
What about the 10K resistors at the bases of the transistors, and the 1K resistors at the collectors. Keep those with theTransistors when I move them, orget rid of them If the 10K resistors are not included the transistors will blow-off, without the 1K....
There is not much to this circuit. Above are all the graphics and pictures. After you gather all your materials, take your transistor and wire it up....
The Amplifier circuit can be made with an IC power amplifier LM1875. IC LM1875 is a single chip power amplifier from National. 20 watts audio amplifier with LM1875 is a low power amplifier with good quality to the room. To assemble the amplifier 20 watts....
150W power amplifier circuit diagram based power transistor TIP41/TIP142/TIP147.It is easy enough to built without PCB. The power output range is about 100-150W...
One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors,....
555 Timer Time Delay Circuit LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes....
The CA3217E contains all required circuit functions between the video detector and picture-tube RGB driver stages of a color television receiver. The CA3217E decodes the chroma signals and then produces three different color signals that are internally....
The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether it be man made interference or static. In this design the RF signal is first met by a resistive....
A USB port, in practice, is capable of supplying more than 100 mA of continuous electric current at 5V to the peripherals which are hooked up with the bus. So a USB port could be utilized, without having any problems, for powering 5V DC operated tiny....
The under/over voltage protection circuit with time delay presented here is a low cost and reliable circuit for protecting such equipments from damages....
This circuit diagram of digital clock uses six common anode seven segment displays to show the time. It needs neither micro controllers or PIC for it`s operation. It`s a MM5314 IC driven digital clock operating at 50 Hz or 60 Hz, and 12 or 24 hour display....
Speed test circuit reaction of is simple planning. This circuit functions for game to test speed reaction of a man. Mode of the action of this peripheral is hardly easy to be comprehended. This thing is caused by this peripheral only lapped over by some....
Schematic diagram in hard copy relating to the computer CSIRAC. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common....
A vibration meter circuit shown in the following schematic diagram uses LM3915 a the main active component. This vibration meter uses a piezoelectric....
The circuit can be used for switching OFF a particular lamp or group of lamps in response to the varying ambient light levels. The unit once built can be used for switching OFF a lamp when dawn breaks and switching it ON when dusk sets in. The power supply....
Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection Well, this simple circuit should put an end to that. It signals that the phone is in use by lighting a red LED. When the phone is not in use, a green LED....
Design a lighting circuit for an indoor garden, and I`m not understanding things that seem like they`re really basic, so I need some help. The schematic I`m referencing is: I have a 24V input source which I`d like to limit to 20V. LA is a series array of....
The IC LM338 by TEXAS INSTRUMENTS, is a versatile IC which can be wired in numerous different ways for obtaining high quality power supply circuit configuartions. The first circuit shows the typical wiring format done around the IC. The circuit provides an....
design of the circuit and coding for the project`s stepper motor controller, the development of the circuit and coding for the speed-controlled DC motor for the project`s propulsion system, the circuit and coding for the system`s navigation system using a....
This is a circuit that is used to menhidupkan LED with voltage 230Volt, 230Volt it so that the voltage must be lowered in accordance with the needs of the LED itself. To lower it even necessary circuit as below...
This car stereo booster uses an LM2896 IC which has two integrated amplifiers. It can be powered with voltages up to 15 volts. The power output is 2. 5 watts per channel with an 8 © load and supply voltage of 12 volts. Using the bridge tehnique in the....
Here is one of the interesting 555 timer circuits to trick your friends while studying electronics in schools. Clap switch circuit is the local name of sound controlled flip flops. This sound controlled light can also be used as sound detection sensors. Flip....
Cool little FM transmitter. Suitable for study purposes, you can use the RF part of this transmitter easily for your projects. However, unless you know how to build a serial data link and connect this LPFM transmitter to a PC or a microcontroller, you won`t....
The 555 Ic is wired as an astable and the frequency is constant and independent of the duty cycle, as the total resistance (R charge + R discharge, notice the diode) is constant and equal to 22Kohm (givin a frequency of about 1Khz, notice the hum). When the....
Power is supplied by continuous voltage, not always stabilized (applied to PWR + and -) at a value between 5 and 32V; such voltage is filtered at the bottom by the diode protecting against polarity inversion (D1) through condensers C1 and C2. Fuse F1 enables....
IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components. There are several examples of applications....
All types of transistors including Darlington and power will be tested in this project. Connect the 9v battery around the other way at points A and B to test....
The following circuit shows about BC 547 Transistor For Garage Alarm Sensor Circuit Diagram. Features: simple single-zone burglar alarm circuit, ....
With this Stereo FM Transmitter with BA1404 you will be able to create a mini stereo FM station and broadcast to your entire home, a simple way to have an audio link wireless with ease. With the FM transmitter BA1404 Hifi Stereo you can stream your music....
This is the complete circuit of the modern homodyne receiver. This receiver can receive AM CW and SSB transmissions...
By developing a low-noise frequency synthesizer at 2 GHz and applying a pair of doublers, it is possible to achieve low-phase-noise outputs past 8 GHz for digital microwave radios....
When my girlfriend and I moved into our small apartment in San Francisco we wanted to setup some sort of compact liquor cabinet and wine rack. After a quick trip to IKEA we had a bookshelf we could easily convert into a fancy boozeshelf unit! *insert music....
The head will be powered by servomotors and will be built from sheet plastic, metal or plywood. The template which can be used for cutting sheet material can be found at the end of this article. Download the template, compare the size of the printed....
The circuit shown in the chart is 1kHz sine wave oscillator circuit. Basing on the double-T circuit, the circuit using 741ordinary operational amplifier to produce 1000Hz sine wave output. Adjusting 100k? potentiometer will make circuit start oscillation,....
This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will be given in order to suit different needs. The circuit as shown in the diagram....
Powering the LED with a 3V CR2032 battery and hoping I could extend the battery life by making the LED blink instead of having it on all the time. The 555 timer one, with large value resistors in the voltage divider, is probably the best. It might need an....
The NL3ASD Schematic Pages - Here Can You Find The Schematics Of A Schematic Of A LED VU Meter With The UAA180....
Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of the mobile phone battery packs have a rating of 3.6V, 650mAh. For increasing the life of the....
The oscillator that is composed of the quartz crystal can be divided into two kinds: the parallel resonant type crystal oscillator and the series resonant type crystal oscillator. The parallel resonant type crystal oscillator and the AC equivalent circuit of....
This high power audio amplifier will give you top class quality for loudspeaker 4 – 8 ohm. Frequency range 20-20000Hz, Voltage 24-36V with current max 5A. You need heatsink to keep the transistor from overheating. ..
General purpose hobby circuit of a simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply can power the whole circuit.Working of this circuit is straight....
So far, we have considered the oscillators which use L-C tuned circuit that causes a phase shift of 180 ° due to inductive or capacitive coupling in addition to a 180 ° phase shift produced by the transistor itself. The oscillators employing L-C elements,....
The Ping Ultrasonic Distance Sensor by Parallax has three pins. These pins are +5V, I/O, and Ground. In order to activate the sensor, a 5 microsecond 5V signal must be sent to the I/O pin. The sensor then waits 750 microseconds before sending an ultrasonic....
The astable multivibrator is a unique form of the relaxation oscillator in which the in-phase feedback is provided by a separate transistor. The first multivibrator was built with vacuum tubes and the circuit was very popular from the start. Millions were....
basically i have what is known as a bite alarm (for fishing). normally bite alarms beep as the fishing line passes over a wheel which usually has notches in it to allow some sort of optical switching making it go beep-beep-beep until the wheel stops. however....
A microprocessor controlled shutter control-box for electrically driven shutters such as the MELLES GRIOT 04 IES 003 and others, such as the ILEX electric shutters. Older view camera lenses often come in shutters that have problems from use or age. Usually a....
This transmitter has a size about that of a large coat button. The transmitter accepts direct voice input and work on a single watch type button cell that serves several tens of hours together. As shown in schematic the transmitter is probably the simplest....
The Vc1 increases linearly when the pull-up resistor RA in the monostable circuit is replaced with constant current source, generating a linear ramp. The linear ramp generating circuit and the generated linear ramp waveforms illustration is shown in figures....
Here is a handy field strength meter that can be used to check the strength of AM radio signals. The circuit is a very useful for those who assemble radio transmitters(especially in the tuning of the final stage for maximum range). The circuit is essentially....
That circuit is similar in concept to the BK Butler/Tubeworks Tube Driver. Since there is only a 9v supply, the tubes operate in "starved plate" mode. Preamp tubes normally operate on 100v-300v. It`s similar to using a Variac on a tube amp. When there is....
This is the 200W lamp flasher circuit diagram. The frequency/speed of the lamp flashing can be adjust with the range of 1Hz to 5Hz. You can use the PR1 variable resistor (trimpot) to adjust the flashing speed. The duty cycle of lamp flashing can be adjusted....
This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
The infrared detector module (GP1U52X) (Radio Shack 276-137) provides a 5 volt TTL pulse train corresponding to the digital code to the button of the remote control. In the lower circuit, the module output normally low a signal and a positive going pulse....
This TDA2030 amplifier circuit is ideal for driving low frequency subwoofer speakers in home theater systems. The TDA2030 is a monolithic integrated circuit intended for use as a low frequency class AB amplifier. This TDA2030 amplifier design needs dual....
This is a simple audio amplifier circuit fabricated around BEL1895 1W audio amplifier IC. This circuit is alternative of the complicated audio amplifier circuit for portable radio receiver. No driver circuit for loudspeaker is needed with the facilities of....
A simple function generator circuit using LM1458 is known here. LM1458 is a dual general purpose operational amplifier. The two opamps inside LM1458 has a common bias network, power supply line and are independent of each other in operation....
Some ten days ago I installed an all-linear automatic night light circuit to control the lights inside the living room. Circuit consists of three op amps-two used as voltage followers and a third as a comparator. As the schematic shows, all user adjustable....
Basically, the circuit consist of two balanced. Simple BFO metal detector. BFO ( beat frequency Ready assembled and tested circuit board Chip in the center is Pic 12F675 Passive detector uses the detector coil in a frequency depended part of a circuit, This....
On my mountain bike I always used to have one of those well-known flashing LED lights from the high street shop. These often gave me trouble with flat batteries and lights that fell off. As an electronics student I thought: this can be done better . First I....
This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.....
Pressing the pushbutton of the transmitter, a sound and/or light alert is activated in the receiver. The system uses no wiring or radio frequencies: the transmitted signal is conveyed into the mains supply line. It can be used at home, in any room from attic....
Hi guys, I`m building a basic RC Car. There`s an LED in the receiver circuit which lights up when I press a button on the remote. But when I connect....
The human eye is amazingly adept at tracking moving objects. The process is so natural to humans that it happens without any conscious effort. While this remarkable ability depends in part on the human brain`s immense processing power, the fast response of....
This is my first AVR-project on this page. The DiSEqC-Tester allows to test DiSEqC-switches that uses 1. 0 or 1. 1 protocols. (DiSEqC-Switches with 2. 0 and 2. 1 protocol have backwards compatibility with 1. 0 & 1. 1 respectively and also may be tested). The....
