New Circuits Page 131
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Controlled rectifiers are line commutated ac to dc power converters which are used to convert a fixed voltage, fixed frequency ac power supply into variable dc output voltage. The input supply fed to a controlled rectifier is ac supply at a fixed rms voltage....
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The following circuit shows about Wireless Car Alarm Circuit Schematic Diagram. Features: pick up every sound in the 20m radius, 1/16 wave length antenna, transmit radio signal up to 2 kilometers, Q1 is the pre-amplifier for the microphone, FM transmitter....
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As numerous or as few channels as are needed may be added to the mixer. Do this by just duplicating the input "sections" that are shown on the schematic design. An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals....
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Crime in general is still on the rise, and having a security alarm installed is no longer a perquisite of the wealthy! Here is a simple and compact securit....
-
In the previous post we discussed a piezo transducer element and learned how to use it with electronic circuits. In this article we will see how a piezo tranducer can be driven or operated using a simple circuit. However the amplification procedure is not by....
-
Ambient Light Sensor Circuit Light sensor circuit, such as the name is a circuit that utilizes the light intensity / beam for the other applications do...
-
With an NE555 you are also able to build an astable multivibrator or blinker. Find out how, and what you need to be aware of....
-
-
With IC SLB0586A from Siemens you can build a simple touch light dimmer circuit that will allow you to adjust the lamp intensity. Together with a TIC206D triac, it enables smooth regulation of light intensity from a bulb of 10W 400W. A coil of 100 µH/5A is....
-
Afroman goes over the basics of how to use an operational amplifier to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone. For more information about amplifiers, Google inverting amplifier non-inverting amplifier ....
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-
This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is ac....
-
-
This touch controlled musical bell circuit circuit produces a musical tone whenever someone touches the touch point designated as TP in the circuit. The circuit works from two AA cells and produces enough sound. The circuit uses IC UM 3481 commonly used in....
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-
3 Watt stereo amplifier circuit using MAX 7910 IC. The MAX9710 a stereo audio power amplifier IC capable of delivering 3Watts of out put to 4 Ohm loads. MAX9710 can be operated from a single 4. 5V to 5. 5V power supply, makes it ideal for hand held....
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The Tesla Coil I’ll be using will use a HV (High Voltage) power source that gives off 9 kV at around 30 mA. The rest of the Tesla coil will be made of 6 Glass bottles, Table salt, Oil, and Aluminum foil for the capacitors, the Primary coil will be made of....
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This Design Idea came about as a result of my not having access to those wonderful new ICs that sense current. I needed a discrete circuit that I could build easily but that would still be as accurate as the new ICs. This circuit seems to do the job. Q2 is....
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A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts....
-
Millimeter-wave frequency bands are attractive for their wide available bandwidths. There are a number of ways to generate these signals but, for each type of oscillator, it is desirable to be able to tune the source electronically, as well as in a defined....
-
This was a small circuit made for driving an Impact counter. The heart being ICL8038. It must have been a Motor driving a Conveyor, the motor has a feedback attachment called Tachogenerator. Only part of the circuit is shown here. See the image of product....
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These "ion chambers" are nothing more than a bare wire stuck through a hole into a metal can! No special gas or sealing is required. For best performance it is probably a good idea to add a desiccant to the inside of the can to keep the humidity low. (I....
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-
Follow the request of friends who likes High power Amplifier Circuit. I then beg for to advise this circuit. It has can to give the electric power about 300Watt RMS unless. Still be amp OCL Model Class AB give sound tall power and certainly should....
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Below is the circuit I`m working with; I plan on having the infrared phototransistor pairs inserted in 3 locations in the middle of the maze, including the end point. The width of the maze will be small enough for one finger to be able to slide in it, and as....
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A mechanism by which a normal pot could be used as a digitized pot since I need each pot`s setting to be converted to a number between 0 and 15. I use that information to determine the duration for each step. I accomplished this by designing an analog to....
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-
Application circuit using 3 stereo digital pots to control volume, balance and fader in 4 speaker configuration and push button interface....
-
The electric car remote control circuit diagram not only can make the model car move forward and backward, but also turn left and right turn, it is simple, easy to operate. Radio remote control receiver demodulation circuit uses TWH9238 components, the....
-
-
The solar panels are operating at optimal parameters when they are at the perfect right angle to the sun. Unfortunately this is accomplished only if solar panels are rotated by the sun. This is the purpose of this diy solar tracker system or if you have an....
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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....
-
The comment on using the existing phono connector was to not really change anything at all. Just replace the electrolytic and paper caps, add the 3-wire line cord and use the radio as-is. The selector switch on the radio probably has an "Aux" or "Phono"....
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This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker Used as a sound effect generator it can be connected to external amplifiers, tape....
-
The circuitry of the Regency shows some peculiarities. The circuit of the self-oscillating mixer stage, the base bias voltage of the second IF stage from the AF power stage, the unusual IF of 262KHz and the supply voltage of 22. 5 V are all characteristic of....
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So here is another improvised model circuit that will eliminate the unwanted DC offset voltage from the output that affect the previous one discussed. By the way, all previous circuits that I discussed were intended as low power class d amp source that is....
-
Using an Atmel ATTiny2313 microcontroller and an HD44780-compatible character LCD display, along with a reed switch and some magnets, I was able to construct a tiny speedometer/trip computer for a soapbox derby cart. It measured the speed of the cart using a....
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It incorporates a Starter for each lamp, which heats up the fillaments [Cathodes] at each end of the lamp prior to starting. Once the lamp has started, it no longer requires heated fillaments. The heating is only a starting aid. During normal operation, the....
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The following circuit shows about LME49810 IC For Power Amplifier Circuit Diagram. Features: better drive 4 ? impedance of the speakers, for the ....
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The FM497 is an integrated electronic ignition controller for breakerless ignition systems using Hall effect Sensors The device drives an NPN external darlington to control the coil current providing the required stored energy with low dissipation. This....
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This is my first autonomous robot. I built it to explore the interfacing of various sensors to a PICAXE processor. His mission is to search for a magn....
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Arduino Mega 2560 Board Tutorials Projects Drivers, Schematic and complete Information...
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-
This is Fluid/Liquid/Water Level Control circuit using LM830. The LM830 can be used to detect absence and presence of aqueous fluids. This application uses two....
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-
To build it, just follow the schematic as shown. (If you need help, please, do not hesitate to message me!) If you`re having trouble identifying the....
-
-
-
-
This is infrared (IR) proximity detector circuit. A matched infrared emitter and detector pair is used in this circuit. The voltage controlled oscillator....
-
Firstly, it demonstrates how the combination of a blue and a white LED can be used to give a realistic imitation of a camera flashlight. Secondly, the good old 555 IC is used in a way many of you may never have seen before alternately mono-stable / astable....
-
A digital volume control circuit diagram using DS 1669, a potentiometer IC.This can be used as a digital volume controller for audio amplifiers and other applications....
-
This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high....
-
Following a highly successful Kickstarter project and over a year of development, HexBright, billed by its creator as the world`s first open source Arduino flashlight, is now in production with initial shipments planned for December. HexBright, which we....
-
Remember that the circuit will fit tightly, so you will not have to glue it. Try several times to put it inside. Modify it bit by bit, and when it enters with a little effort but does not move you have the right size. put the whole circuit inside the servo,....
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-
This 12V power inverter circuit can be used to power small power devices that need a 240 volts. This 12V power inverter circuit is very useful when you want to use a 240 volts consumer powered by a 12 volts car battery. In contrast to the usual feedback....
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LM35 Smart Heater Controller SchematicMinuscule circuit of the electronic heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC. Besides, a popular BiMos Op-amp CA3140 (IC2) is used to sense the....
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A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector....
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Where good frequency stability is required, in applications such radio transmitters, basic LC oscillators cannot guarantee to hold their frequency without some drifting, which can be caused by quite small changes in supply voltage (although stabilised power....
-
-
The Automatic Forklift System (AFS) is designed to make the process of stocking warehouses safer and more efficient. With current manually operated forklifts, employees are at risk of injury. The Automatic Forklift System (AFS) is designed to make the....
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ArduinoISP Bootloader/Programmer Combination Shield (not shown) & Arduino with USB to serial chip (e. g. Arduino Uno ) to upload the bootloader and sketches to DIYduino. You can also use a USBtoSerial programmer for uploading a sketch and work around the....
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The following circuit shows about Sensor Circuit Of Analog Line Follower Robot. Features: controlled by a microcontroller, sensor circuit, a set ....
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There are situations in which very long cable runs are necessary from the pedalboard to the amplifier, or a more powerful driving circuit is needed to the heavy load presented by devices in parallel. A good buffer box is the solution. The best buffer board....
-
I`ve been visiting local convenience store (Dollarama, here in Montreal, Canada) and notice nice looking FM Radio, just for only $3. Why not to try to interface it to my lovely Arduino Idea looks quite challenging, the same time what is the point in....
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-
However, for applications needing many LEDs, this becomes extravagantly inefficient and it is tempting to keep the voltage drop across the resistor as small as possible. That leads to poor control of the current. ICs such as the MM5450 and its relatives and....
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Every DAC board and also decoder includes power supply part. Only one part which missing is power transformer. It is possible to use for example toroidal transformer with a power switch and fuse holder on a chassis. I offer here one of many variants where is....
-
This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
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The SC1437 is a battery over voltage detection circuit with driver for external MOSFET The trip point is adjustable with an external resistor divider connected to the SENSE pin. The trip point is preset to a nominal trip voltage of 4. 2V if no external....
-
It is impossible to imagine present day society without any batteries. Count the number of gadgets in your house that are powered from batteries, you will be stunned by the number of batteries you will find. The majority of these devices use penlight....
-
-
The schematic diagram below show a complete barometric pressure signal conditioner that operates from a single 1.5V battery. We can get the best accuracy and...
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It allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. Component: 555IC, Transistor, Resistor, Relay, Polarised Capacitor...
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-
When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to lower values. When the voltage drops lower than VCC/3 the 555 is triggered and goes high (from 0 TO VCC).....
-
This is a very useful and simple circuit diagram for amplifying weak signal from a capacitive condenser microphone. You can use this circuit for sound sensing applications and some automatic robotic sensors. We have already posted an efficient audio....
-
First section of free-running 7413 Schmitt-trigger oscillator runs at one-third of desired TV-channel carrier frequency (about 20 MHz for channel3) and drives buffer section whose output is square wave at oscillator fundamental. Q1 modulates RF output by....
-
The way an engine management system monitors its Air / Fuel ratio is through the Oxygen Sensor (O2) stuck in the hot exhaust flow, usually before the catalytic converter. All O2 sensors are basically the same, with some being heated or others providing....
-
A reference design for a 4S1P MR-16 LED driver that provides 750mA to a string of four white LEDs (WLEDs). The circuit operates from a 24V source and is based around the MAX16820 hysteretic LED driver. Also included is a MAX5033 24V-to-5V, 150mA switching....
-
This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small....
-
While doing some background reading about the Philips I2C bus I came across an application note written by Herman Schutte (of Philips Semiconductors Systems Laboratory in Eindhoven). Mr. Schutte described an elegant mechanism for interfacing sections of....
-
You can easily build a barebones Arduino yourself. This project shows a breadboarded Arduino without an FTDI chip. This means no USB connectivity (this could be however accomplished using a USB-Serial breakout board). Use an ATMEGA168, a 1k resistor, a....
-
Above, the saturation region starts at the knees on the left. We`re interested in curves for negative gate voltages (depletion mode). Note that this device also operates in enhancement mode (with positive bias)! Flexibility. The construction method for this....
-
This is anti theft alarm with wireless connectivity, called Anti Theft Car wireless alarm The FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at....
-
-
The LM231 LM331 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for Analog-to-digital conversion, precision frequency-to-voltage conversion, long-term integration, linear frequency modulation or demodulation,....
-
The MS6712 is a 4 stereo inputs/4-channel outputs digital control Audio Processor for the low voltage operation. Volume, Tone (bass and treble), balance (left/right), and fader (front/rear) processor are incorporated into a single chip. The MS6712 also has....
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This article aims to introduce to beginners and intermediate readers a simple solution to build a digital to analog converter, based on the famous r/2r resistors network. This article also discuss a problem encountered by many beginners while trying to build....
-
Advanced Melody doorbell is the very interesting project in the series of alarm Circuit diagram with description of melody doorbell using battery instead of AC mains ...
-
Controlled rectifiers are line commutated ac to dc power converters which are used to convert a fixed voltage, fixed frequency ac power supply into variable dc output voltage. The input supply fed to a controlled rectifier is ac supply at a fixed rms voltage....
The following circuit shows about Wireless Car Alarm Circuit Schematic Diagram. Features: pick up every sound in the 20m radius, 1/16 wave length antenna, transmit radio signal up to 2 kilometers, Q1 is the pre-amplifier for the microphone, FM transmitter....
As numerous or as few channels as are needed may be added to the mixer. Do this by just duplicating the input "sections" that are shown on the schematic design. An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals....
Crime in general is still on the rise, and having a security alarm installed is no longer a perquisite of the wealthy! Here is a simple and compact securit....
In the previous post we discussed a piezo transducer element and learned how to use it with electronic circuits. In this article we will see how a piezo tranducer can be driven or operated using a simple circuit. However the amplification procedure is not by....
Ambient Light Sensor Circuit Light sensor circuit, such as the name is a circuit that utilizes the light intensity / beam for the other applications do...
With an NE555 you are also able to build an astable multivibrator or blinker. Find out how, and what you need to be aware of....
With IC SLB0586A from Siemens you can build a simple touch light dimmer circuit that will allow you to adjust the lamp intensity. Together with a TIC206D triac, it enables smooth regulation of light intensity from a bulb of 10W 400W. A coil of 100 µH/5A is....
Afroman goes over the basics of how to use an operational amplifier to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone. For more information about amplifiers, Google inverting amplifier non-inverting amplifier ....
This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is ac....
This touch controlled musical bell circuit circuit produces a musical tone whenever someone touches the touch point designated as TP in the circuit. The circuit works from two AA cells and produces enough sound. The circuit uses IC UM 3481 commonly used in....
3 Watt stereo amplifier circuit using MAX 7910 IC. The MAX9710 a stereo audio power amplifier IC capable of delivering 3Watts of out put to 4 Ohm loads. MAX9710 can be operated from a single 4. 5V to 5. 5V power supply, makes it ideal for hand held....
The Tesla Coil I’ll be using will use a HV (High Voltage) power source that gives off 9 kV at around 30 mA. The rest of the Tesla coil will be made of 6 Glass bottles, Table salt, Oil, and Aluminum foil for the capacitors, the Primary coil will be made of....
This Design Idea came about as a result of my not having access to those wonderful new ICs that sense current. I needed a discrete circuit that I could build easily but that would still be as accurate as the new ICs. This circuit seems to do the job. Q2 is....
A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts....
Millimeter-wave frequency bands are attractive for their wide available bandwidths. There are a number of ways to generate these signals but, for each type of oscillator, it is desirable to be able to tune the source electronically, as well as in a defined....
This was a small circuit made for driving an Impact counter. The heart being ICL8038. It must have been a Motor driving a Conveyor, the motor has a feedback attachment called Tachogenerator. Only part of the circuit is shown here. See the image of product....
These "ion chambers" are nothing more than a bare wire stuck through a hole into a metal can! No special gas or sealing is required. For best performance it is probably a good idea to add a desiccant to the inside of the can to keep the humidity low. (I....
Follow the request of friends who likes High power Amplifier Circuit. I then beg for to advise this circuit. It has can to give the electric power about 300Watt RMS unless. Still be amp OCL Model Class AB give sound tall power and certainly should....
Below is the circuit I`m working with; I plan on having the infrared phototransistor pairs inserted in 3 locations in the middle of the maze, including the end point. The width of the maze will be small enough for one finger to be able to slide in it, and as....
A mechanism by which a normal pot could be used as a digitized pot since I need each pot`s setting to be converted to a number between 0 and 15. I use that information to determine the duration for each step. I accomplished this by designing an analog to....
Application circuit using 3 stereo digital pots to control volume, balance and fader in 4 speaker configuration and push button interface....
The electric car remote control circuit diagram not only can make the model car move forward and backward, but also turn left and right turn, it is simple, easy to operate. Radio remote control receiver demodulation circuit uses TWH9238 components, the....
The solar panels are operating at optimal parameters when they are at the perfect right angle to the sun. Unfortunately this is accomplished only if solar panels are rotated by the sun. This is the purpose of this diy solar tracker system or if you have an....
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....
The comment on using the existing phono connector was to not really change anything at all. Just replace the electrolytic and paper caps, add the 3-wire line cord and use the radio as-is. The selector switch on the radio probably has an "Aux" or "Phono"....
This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker Used as a sound effect generator it can be connected to external amplifiers, tape....
The circuitry of the Regency shows some peculiarities. The circuit of the self-oscillating mixer stage, the base bias voltage of the second IF stage from the AF power stage, the unusual IF of 262KHz and the supply voltage of 22. 5 V are all characteristic of....
So here is another improvised model circuit that will eliminate the unwanted DC offset voltage from the output that affect the previous one discussed. By the way, all previous circuits that I discussed were intended as low power class d amp source that is....
Using an Atmel ATTiny2313 microcontroller and an HD44780-compatible character LCD display, along with a reed switch and some magnets, I was able to construct a tiny speedometer/trip computer for a soapbox derby cart. It measured the speed of the cart using a....
It incorporates a Starter for each lamp, which heats up the fillaments [Cathodes] at each end of the lamp prior to starting. Once the lamp has started, it no longer requires heated fillaments. The heating is only a starting aid. During normal operation, the....
The following circuit shows about LME49810 IC For Power Amplifier Circuit Diagram. Features: better drive 4 ? impedance of the speakers, for the ....
The FM497 is an integrated electronic ignition controller for breakerless ignition systems using Hall effect Sensors The device drives an NPN external darlington to control the coil current providing the required stored energy with low dissipation. This....
This is my first autonomous robot. I built it to explore the interfacing of various sensors to a PICAXE processor. His mission is to search for a magn....
Arduino Mega 2560 Board Tutorials Projects Drivers, Schematic and complete Information...
This is Fluid/Liquid/Water Level Control circuit using LM830. The LM830 can be used to detect absence and presence of aqueous fluids. This application uses two....
To build it, just follow the schematic as shown. (If you need help, please, do not hesitate to message me!) If you`re having trouble identifying the....
This is infrared (IR) proximity detector circuit. A matched infrared emitter and detector pair is used in this circuit. The voltage controlled oscillator....
Firstly, it demonstrates how the combination of a blue and a white LED can be used to give a realistic imitation of a camera flashlight. Secondly, the good old 555 IC is used in a way many of you may never have seen before alternately mono-stable / astable....
A digital volume control circuit diagram using DS 1669, a potentiometer IC.This can be used as a digital volume controller for audio amplifiers and other applications....
This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high....
Following a highly successful Kickstarter project and over a year of development, HexBright, billed by its creator as the world`s first open source Arduino flashlight, is now in production with initial shipments planned for December. HexBright, which we....
Remember that the circuit will fit tightly, so you will not have to glue it. Try several times to put it inside. Modify it bit by bit, and when it enters with a little effort but does not move you have the right size. put the whole circuit inside the servo,....
This 12V power inverter circuit can be used to power small power devices that need a 240 volts. This 12V power inverter circuit is very useful when you want to use a 240 volts consumer powered by a 12 volts car battery. In contrast to the usual feedback....
LM35 Smart Heater Controller SchematicMinuscule circuit of the electronic heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC. Besides, a popular BiMos Op-amp CA3140 (IC2) is used to sense the....
A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector....
Where good frequency stability is required, in applications such radio transmitters, basic LC oscillators cannot guarantee to hold their frequency without some drifting, which can be caused by quite small changes in supply voltage (although stabilised power....
The Automatic Forklift System (AFS) is designed to make the process of stocking warehouses safer and more efficient. With current manually operated forklifts, employees are at risk of injury. The Automatic Forklift System (AFS) is designed to make the....
ArduinoISP Bootloader/Programmer Combination Shield (not shown) & Arduino with USB to serial chip (e. g. Arduino Uno ) to upload the bootloader and sketches to DIYduino. You can also use a USBtoSerial programmer for uploading a sketch and work around the....
The following circuit shows about Sensor Circuit Of Analog Line Follower Robot. Features: controlled by a microcontroller, sensor circuit, a set ....
There are situations in which very long cable runs are necessary from the pedalboard to the amplifier, or a more powerful driving circuit is needed to the heavy load presented by devices in parallel. A good buffer box is the solution. The best buffer board....
I`ve been visiting local convenience store (Dollarama, here in Montreal, Canada) and notice nice looking FM Radio, just for only $3. Why not to try to interface it to my lovely Arduino Idea looks quite challenging, the same time what is the point in....
However, for applications needing many LEDs, this becomes extravagantly inefficient and it is tempting to keep the voltage drop across the resistor as small as possible. That leads to poor control of the current. ICs such as the MM5450 and its relatives and....
Every DAC board and also decoder includes power supply part. Only one part which missing is power transformer. It is possible to use for example toroidal transformer with a power switch and fuse holder on a chassis. I offer here one of many variants where is....
This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
The SC1437 is a battery over voltage detection circuit with driver for external MOSFET The trip point is adjustable with an external resistor divider connected to the SENSE pin. The trip point is preset to a nominal trip voltage of 4. 2V if no external....
It is impossible to imagine present day society without any batteries. Count the number of gadgets in your house that are powered from batteries, you will be stunned by the number of batteries you will find. The majority of these devices use penlight....
The schematic diagram below show a complete barometric pressure signal conditioner that operates from a single 1.5V battery. We can get the best accuracy and...
It allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. Component: 555IC, Transistor, Resistor, Relay, Polarised Capacitor...
When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to lower values. When the voltage drops lower than VCC/3 the 555 is triggered and goes high (from 0 TO VCC).....
This is a very useful and simple circuit diagram for amplifying weak signal from a capacitive condenser microphone. You can use this circuit for sound sensing applications and some automatic robotic sensors. We have already posted an efficient audio....
First section of free-running 7413 Schmitt-trigger oscillator runs at one-third of desired TV-channel carrier frequency (about 20 MHz for channel3) and drives buffer section whose output is square wave at oscillator fundamental. Q1 modulates RF output by....
The way an engine management system monitors its Air / Fuel ratio is through the Oxygen Sensor (O2) stuck in the hot exhaust flow, usually before the catalytic converter. All O2 sensors are basically the same, with some being heated or others providing....
A reference design for a 4S1P MR-16 LED driver that provides 750mA to a string of four white LEDs (WLEDs). The circuit operates from a 24V source and is based around the MAX16820 hysteretic LED driver. Also included is a MAX5033 24V-to-5V, 150mA switching....
This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small....
While doing some background reading about the Philips I2C bus I came across an application note written by Herman Schutte (of Philips Semiconductors Systems Laboratory in Eindhoven). Mr. Schutte described an elegant mechanism for interfacing sections of....
You can easily build a barebones Arduino yourself. This project shows a breadboarded Arduino without an FTDI chip. This means no USB connectivity (this could be however accomplished using a USB-Serial breakout board). Use an ATMEGA168, a 1k resistor, a....
Above, the saturation region starts at the knees on the left. We`re interested in curves for negative gate voltages (depletion mode). Note that this device also operates in enhancement mode (with positive bias)! Flexibility. The construction method for this....
This is anti theft alarm with wireless connectivity, called Anti Theft Car wireless alarm The FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at....![LM1279 110 MHz RGB Video Amplifier System With OSD [Obsolete]](uploads/12/LM1279-circuits.jpg "LM1279 110 MHz RGB Video Amplifier System With OSD [Obsolete]")
The LM231 LM331 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for Analog-to-digital conversion, precision frequency-to-voltage conversion, long-term integration, linear frequency modulation or demodulation,....
The MS6712 is a 4 stereo inputs/4-channel outputs digital control Audio Processor for the low voltage operation. Volume, Tone (bass and treble), balance (left/right), and fader (front/rear) processor are incorporated into a single chip. The MS6712 also has....
This article aims to introduce to beginners and intermediate readers a simple solution to build a digital to analog converter, based on the famous r/2r resistors network. This article also discuss a problem encountered by many beginners while trying to build....
Advanced Melody doorbell is the very interesting project in the series of alarm Circuit diagram with description of melody doorbell using battery instead of AC mains ...
