New Circuits Page 187
- Page 187
-
Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The...
-
-
A mouse has two axes: "X" and "Y". When the mouse is moved "horizontally", the "X" wheel inside the mouse rotates. When the mouse is moved "vertically" (upon a surface), the "Y" wheel inside the mouse rotates. For arbitrary mouse motion, the "X" and "Y"....
-
In this article we make digital thermometer on the Arduino Uno. In this Digital Thermometer temperature sensor used is LM35DZ. In other applications you can replace with LM35 temperature sensor such as DS18B20 and others. In principle, the sensor will detect....
-
The Schmitt trigger is a special circuit which acts like a switch that changes state at two different thresholds. These are called the upper and lower threshold or the positive and negative going threshold. The difference in these two threshold levels is....
-
Small inductance changes on the order of 0. 01% can easily be sensed over a wide range with a simple circuit connected to a serial port ( see the figure ). Using a classic Colpitts oscillator interfaced to an eight-pin Atmel ATtiny12-8 microprocessor, the....
-
The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit. The....
-
-
Switch 50V AC voltage. Maximum drained current will be 5A. Frequency is 50Hz. Switching speed is not important, can be real slow, it is not a problem in my application. I wanted to use solid state relay at first for this purpose. But as soon as I started to....
-
We can use the circuit below to maintain the level of water in the header tank within prescribed limits. A 3HP submersible bore pump which has a high starting....
-
This circuit is design of the counter timer that using countdown calculation. This circuit is using 555 IC as main control. 555 IC is a counter IC and a transistor switch to activate a relay either ON/OFF (mode selected by a jumper) as soon as the counting....
-
-
In today s blog we re going to examine a bipolar chopper drive, a common method for precision current control in stepper motors....
-
-
Here is a simple shock sensitive alarm circuit that has many many applications fro home to automobiles. The main application of this circuit is to use it as an anti theft alarm in automobiles. A peizo electric sensor is used as the shock sensor which has to....
-
Simple TV transmitter circuit using the TV modulator circuit IC MC1374. 12V supply, channel 3 or 4 operation, FM modulation for sound....
-
With the 10KG potentiometer, you can vary the contrast from dark to bright. When the potentiometer is near 0G , the screen will be very dark. As you turn the potentiometer up to 10KG , the screen will become brighter. ..
-
The Microchip PIC 16C84 was one of the first serial in-system programmable microcontroller. I saw PIC serial programmers published in Electronic magazines in 1993. Today, many PIC programmer circuits - for serial and parallel PC ports - are published on the....
-
This is an electronic muscle stimulator circuit that stimulates nerves of that part of your body where electrodes are attached. It is useful to relieve hea....
-
A friend and frequent event-production collaborator has been accumulating legacy Telex wireless intercom gear from various sources, and while the equipment arrives in a nominally working state it sometimes has a few little problems and tends to take a....
-
-
This device has been designed as an example application of an expandable system of modules for building mobile robots following the standards set out in the discussion on the Society Of Robots forum. These modules can be connected to each other using an i2c....
-
The CYB-P51 (Rev A) Prototyping Board is designed as a two layer board (without power and ground planes). All components, except the premounted P-51, are through-hole for easy probing and replacement of parts. The board has an oscillator circuit and a....
-
radar n. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency....
-
The medical treat ventilator controller circuit is composed of astable oscillator, control circuit and power supply circuit, it is shown in the figure 9-155. The astable oscillator circuit is made of resistors R1, R2, potentiometer RP, capacitors C1, C2 and....
-
This circuit serves to show the speed of the vehicle in kmph. An opaque disc is mounted on the spindle attached to the front wheel of the vehicle. The disc has about equidistant holes on its periphery. On one side of the disc an infrared LED is fixed and on....
-
A DTMF-based IR transmitter and receiver pair can be used to realize a proximity detector. The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in front of the IR LED photo-detector pair up to a distance of....
-
Build a CD47 Nixie Clock. Power: approx. 100 Watts (some might say "Isn`t it over- engineered", but you`ll see at the end of that project, that it`s ok. Nixies will be switched off when nobody is around- this will keep them alive as long as possible. The....
-
IC2 is wired as a low frequency astable with a cycle period of about 6 seconds. The slowly varying ramp waveform at C1 is fed to PNP emitter follower Q1, and is then used to frequency modulate alarm generator IC1 via R6. IC1 has a natural center frequency of....
-
There are many kinds of AVR programmers in market, most of these use the parallel port, a serial port (COM port), or the USB but they are very costly and hobbyist like me can not buy such a costly programmer so i decided to make a cheap AVR programmer. Being....
-
Have a 2003 Ford Crown Vic (Police), Have 3 problems First on Acceleration (hot) sometimes instrument cluster only has it`s back lighting go off and on. Second on Acceleration (hot) sometimes you hear a relay under left side of dash click and all back....
-
The schematic for this project is actually deceivingly simple compared to the complexity of what is happening in the circuit. So take a look below or click to view the full sized schematic. The two signals we`ve just generated are mixed together at the base....
-
Below is the final schematic for the Menta ECG Simulator project. LadyAda`s Eagle schematic for the Menta was used as a starting point and I simply ad....
-
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....
-
A dual benefit for battery-powered portable devices is provided by Class D audio amplifier. The produce much less power dissipation than do their linear cousins...
-
The 7th overtone of 18mhz (17m) is 144mhz (2m) smack dab in the CW region. Icarus a HAB project run on advertising revenue that seems successful and has launched many balloons with some awesome photos. Robert Harrison knows his stuff! Lessons in Electric....
-
-
-
-
The Clarinet preamplifier is agile, detailed, and warm without being euphonic. It has excellent soundstaging, tonal balance, presence, and palpability. It is far better than any of the other kit preamplifiers I have heard to date, and is worth your serious....
-
For those of us that cannot afford the high cost of some of these SDR radios there is hope. Here I describe an I. F. converter suitable for use with Boat Anchors Communications receivers. Now it is possible to couple the great front ends of an R390 or SP600....
-
The 1-meg resistor helps protect the FET from being harmed by any accidental sparks to its Gate lead. The circuit will work fine without this resistor. Just don`t intentionally "zap" the Gate wire with a charged object or your charged finger. To test the....
-
Installing a small dash mounted 2 speed fan in my motorhome. What`s the best way Use your 1 channel and then find a relay or use the 4 channel and use the seperate wires [1 low spd. &1 high spd ] Any other lideas Would it hurt the unit if it were placed in....
-
This circuit features automatic Exit and Entry delays - timed bell cut-off - and system reset. It has provision for normally-open and normally-closed switches - and will suit all of the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape,....
-
Used Zener Diodes to derive the stabilized voltage for the Hartley oscillator (although I did find a couple of suitable voltage stabiliser valves (CV287) whilst sorting through a box of valves this morning). Whilst sniffing around in that box of valves....
-
About all that can be said about top octave generators is that they were cute and cheap, compared to other methods of tone generation. Trouble is, they were nearly perfect and to use one resulted in chords that were very flat-sounding and on organs, stops....
-
There are two types of pre-amplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SILICON CHIP. It has the RIAA equalisation network in the feedback loop. The second type was previously....
-
I`ve had this old amp for about years, and friend of mine has volunteered to do the work to restore it. This is a Webster-Chicago 166-1 amplifier....
-
-
The concept behind the light dimmer is to control the voltage to the light lamp or any source. Light dimmers regulate the voltage to the source they are connected to. This regulation of voltage increases or decreases the light intensity. Light dimmers first....
-
This chapter contains circuit diagrams for several power supplies for pulsed solid state lasers. These include units suitable for driving the popular Hughes ruby and YAG rangefinder laser assemblies as well, one using the flash from a disposable pocket....
-
The circuit is split into two sections: the isolated external loop which is connected to the remote interface connector on the front of the PSU and the non-isolated inner loop which is connected to the HT (AC line) supply. The two loops are linked by....
-
The aim of this project was to create a front-end for Commodore 64 emulation using VICE. One of the primary problems with emulators (especially for machines from the `80s) is that there was no standard keyboard arrangement. In this project I took a broken....
-
This circuit is conventional Pierce type oscillator that uses a JFET. The circuit uses fundamental mode crystals. It has decent performance and reliability if we use a low noise JFET. This is the figure of the circuit. The feedback is controlled by the C1....
-
When enough light falls on the LDR in this circuit, an alarm tone is played on the loudspeaker. This tutorial shows beginners in electronics how to build the circuit on breadboard step by step....
-
In this circuit we demonstrate how to use SCRs to control low-voltage pulsating DC to operate homemade LED light panels. While in this circuit I use the Arduino, the concepts should work with any number of micro-controllers using either hardware interrupts....
-
-
To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adapters available in the market are generally costl....
-
This simple AVR Programmer able to transfer hex programs to mostATMEL AVR microcontrollers. It is more reliable than most other simpleAVR programmers available out there and can be built in very shortamount of time. This Programmer support the AVR....
-
-
The following circuit is the combination of echo chamber circuit that will make the sound repeated, just like an echo sound when you speak in cave. And the robot voice effect circuit that change the audio signal from input to become sound like a robot voice.....
-
This circuit delivers an initial voltage of 2.5V per cell to rapidly charge a car battery. The charging current decreases as the battery charges and when t....
-
Measurement microphones differ from recording microphones and sound meters-they have a flat response, (usually to well below 20 Hz. , and above 20 kHz. , ) and do not have "weighted, " or equalized frequency response. They are also optimized for....
-
This The multi-purpose Amplifier using TDA2030. It is have power 8 watt (RMS) at 8 ohm loudspeakers. It is have low noise be valuable THD (Total harmonic....
-
The integrated output amplifier described in this article consists of little more than one integrated circuit. It is intended especially for use in motor vehicles and other battery-operated applications. Although it appears simple and hardly worth looking....
-
Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply volta....
-
schematic of board with PIC16F84 and also other PICs which can be connected to this USB PICKit2 programmer If someone has such please show me, i`d appreciate it, thanks. another question is i heard that if i experiment with oscillator ffrequency on my demo....
-
Lithium-ion battery charging circuit is shown as above. When it starts to charge. The battery voltage is below 8.4V, IC1`s output has no output. Q2 off, LM317 work in the constant current output. When the battery voltage is increased to 8.4V, Q2 turns on, Q2....
-
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components....
-
NI Multisim software offers advanced virtual instruments and analyses to help you gain a deeper and more complex understanding of the operation of your design. One of these tools, the measurement probe, can be a quick and functional interface to the....
-
This Application Note describes the evaluation board for the AD7892-2 12-Bit A/D converter The AD7892-2 is a high speed, low power, 500ksps successive approximation ADC which operates from a single +5V supply. It incorporates an on chip track/hold Amplifier....
-
-
-
-
As the figure 15-22 shows, the doorbell is composed of the monostable timing circuit, the password switch, the NAND gate circuit and the sound circuit.etc. In the limited time, the circuit uses the program to press the password switch, the doorbell circuit....
-
This is a simplified version of the 4-Digit Keypad Controlled Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of....
-
This circuit is composed of a temperature sensor, amplifier, V/F converter, three digit binary coded decimal (BCD) counter, time base and seven segment led displays. In addition to the 9400 V/F converter, other ICs need for this project include the LM334....
-
-
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of d....
-
As many or as few channels as are required can be added to the mixer. Do this by just duplicating the input "sections" which are clearly shown on the schematic. One version of this mixer I saw had 25 inputs! ..
-
Application note on how to design linear and switch-mode (switching dc-dc converter current source) battery charger applications that require external microcontrollers and related system-level issues for notebook computers....
-
Back in the day when AM was king, no expense was spared on transmitting equipment. I remember the GE BTA-25 transmitter from the same era, it was build like a tank. Once, while we were repairing the Harris MW-50A main transmitter, the old GE burped,....
-
There are several ways to convert an AC voltage at a wall receptacle into the DC voltage required by a microcontroller. Traditionally, this has been done w....
-
A voltage-controlled oscillator or VCO is an electronic oscillator designed to be controlled in oscillation frequency by a voltage input. The frequency of oscillation is varied by the applied DC voltage, while modulating signals may also be fed into the VCO....
-
-
-
-
-
The circuit can measure the frequency between 1. 5kHz ~ 500kHz by connecting C1 ~ C6 different capacitors. The maximum frequency is up to 1MHz. Transistor T1 can be used as the integrator, and its load resistor is 15k © resistor and R1 ~~ R6 adjustable....
-
This circuit will drive a relay coil from a low power output, usually from an IC like 555 or a TTL/CMOS. It is used to switch high loads or loads that needs AC current to operate. The relay will be actuated when the input of the circuit goes high. The....
-
-
the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire....
-
The requirements for electric energy quality of modern industrial development are higher and higher, how to offer the safe and reliable green power to energy consumer is a focus of area research of the power at present. UPS, as a kind of incessant power....
-
This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to directly drive three coloured LEDs (red, green and amber). At switch-on, the circuit lights the red signal for 30s, then shows green for 6s, then amber for 3s. It....
-
This project documents how to build and construct your own Brushed Motor ESC for Cars and Boats using a Microchip 12F675 PIC and a small number of standard components. This ESC grew out of an earlier aircraft ESC. A number of people asked for an ESC with....
-
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.....
-
The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery. The loud speaker for producing sound is of 0. 5W 8ohm speaker. The circuit will readily generate a rain like sound....
-
-
-
This is a design for a high impedance DC voltmeter. This circuit is design with built by uA741 IC. This IC is a op-amp non-inverting DC amplifier. The IC have negative feedback that is through a DC meter requiring 1mA for full scale deflection. This is the....
-
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....
-
While laying in bed and watching movies on my laptop, I used to think if there is a remote control, it will be easy to pause, play, fwd, rev, adjust volume, play next etc etc without going near to the system. Then I planned to make a remote control. I don`t....
-
Circuit Making Home Theater 5.1 Surround amplifier schematics Circuit Electronics, Actually, 5.1 channel amplifier consists of 6 amplifiers 1 channel mono, which has certain specifications on each canals. Has 6 channel surround sound ampli....
Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The...
A mouse has two axes: "X" and "Y". When the mouse is moved "horizontally", the "X" wheel inside the mouse rotates. When the mouse is moved "vertically" (upon a surface), the "Y" wheel inside the mouse rotates. For arbitrary mouse motion, the "X" and "Y"....
In this article we make digital thermometer on the Arduino Uno. In this Digital Thermometer temperature sensor used is LM35DZ. In other applications you can replace with LM35 temperature sensor such as DS18B20 and others. In principle, the sensor will detect....
The Schmitt trigger is a special circuit which acts like a switch that changes state at two different thresholds. These are called the upper and lower threshold or the positive and negative going threshold. The difference in these two threshold levels is....
Small inductance changes on the order of 0. 01% can easily be sensed over a wide range with a simple circuit connected to a serial port ( see the figure ). Using a classic Colpitts oscillator interfaced to an eight-pin Atmel ATtiny12-8 microprocessor, the....
The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit. The....
Switch 50V AC voltage. Maximum drained current will be 5A. Frequency is 50Hz. Switching speed is not important, can be real slow, it is not a problem in my application. I wanted to use solid state relay at first for this purpose. But as soon as I started to....
We can use the circuit below to maintain the level of water in the header tank within prescribed limits. A 3HP submersible bore pump which has a high starting....
This circuit is design of the counter timer that using countdown calculation. This circuit is using 555 IC as main control. 555 IC is a counter IC and a transistor switch to activate a relay either ON/OFF (mode selected by a jumper) as soon as the counting....
In today s blog we re going to examine a bipolar chopper drive, a common method for precision current control in stepper motors....
Here is a simple shock sensitive alarm circuit that has many many applications fro home to automobiles. The main application of this circuit is to use it as an anti theft alarm in automobiles. A peizo electric sensor is used as the shock sensor which has to....
Simple TV transmitter circuit using the TV modulator circuit IC MC1374. 12V supply, channel 3 or 4 operation, FM modulation for sound....
With the 10KG potentiometer, you can vary the contrast from dark to bright. When the potentiometer is near 0G , the screen will be very dark. As you turn the potentiometer up to 10KG , the screen will become brighter. ..
The Microchip PIC 16C84 was one of the first serial in-system programmable microcontroller. I saw PIC serial programmers published in Electronic magazines in 1993. Today, many PIC programmer circuits - for serial and parallel PC ports - are published on the....
This is an electronic muscle stimulator circuit that stimulates nerves of that part of your body where electrodes are attached. It is useful to relieve hea....
A friend and frequent event-production collaborator has been accumulating legacy Telex wireless intercom gear from various sources, and while the equipment arrives in a nominally working state it sometimes has a few little problems and tends to take a....
This device has been designed as an example application of an expandable system of modules for building mobile robots following the standards set out in the discussion on the Society Of Robots forum. These modules can be connected to each other using an i2c....
The CYB-P51 (Rev A) Prototyping Board is designed as a two layer board (without power and ground planes). All components, except the premounted P-51, are through-hole for easy probing and replacement of parts. The board has an oscillator circuit and a....
radar n. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency....
The medical treat ventilator controller circuit is composed of astable oscillator, control circuit and power supply circuit, it is shown in the figure 9-155. The astable oscillator circuit is made of resistors R1, R2, potentiometer RP, capacitors C1, C2 and....
This circuit serves to show the speed of the vehicle in kmph. An opaque disc is mounted on the spindle attached to the front wheel of the vehicle. The disc has about equidistant holes on its periphery. On one side of the disc an infrared LED is fixed and on....
A DTMF-based IR transmitter and receiver pair can be used to realize a proximity detector. The circuit presented here enables you to detect any object capable of reflecting the IR beam and moving in front of the IR LED photo-detector pair up to a distance of....
Build a CD47 Nixie Clock. Power: approx. 100 Watts (some might say "Isn`t it over- engineered", but you`ll see at the end of that project, that it`s ok. Nixies will be switched off when nobody is around- this will keep them alive as long as possible. The....
IC2 is wired as a low frequency astable with a cycle period of about 6 seconds. The slowly varying ramp waveform at C1 is fed to PNP emitter follower Q1, and is then used to frequency modulate alarm generator IC1 via R6. IC1 has a natural center frequency of....
There are many kinds of AVR programmers in market, most of these use the parallel port, a serial port (COM port), or the USB but they are very costly and hobbyist like me can not buy such a costly programmer so i decided to make a cheap AVR programmer. Being....
Have a 2003 Ford Crown Vic (Police), Have 3 problems First on Acceleration (hot) sometimes instrument cluster only has it`s back lighting go off and on. Second on Acceleration (hot) sometimes you hear a relay under left side of dash click and all back....
The schematic for this project is actually deceivingly simple compared to the complexity of what is happening in the circuit. So take a look below or click to view the full sized schematic. The two signals we`ve just generated are mixed together at the base....
Below is the final schematic for the Menta ECG Simulator project. LadyAda`s Eagle schematic for the Menta was used as a starting point and I simply ad....
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....
A dual benefit for battery-powered portable devices is provided by Class D audio amplifier. The produce much less power dissipation than do their linear cousins...
The 7th overtone of 18mhz (17m) is 144mhz (2m) smack dab in the CW region. Icarus a HAB project run on advertising revenue that seems successful and has launched many balloons with some awesome photos. Robert Harrison knows his stuff! Lessons in Electric....
The Clarinet preamplifier is agile, detailed, and warm without being euphonic. It has excellent soundstaging, tonal balance, presence, and palpability. It is far better than any of the other kit preamplifiers I have heard to date, and is worth your serious....
For those of us that cannot afford the high cost of some of these SDR radios there is hope. Here I describe an I. F. converter suitable for use with Boat Anchors Communications receivers. Now it is possible to couple the great front ends of an R390 or SP600....
The 1-meg resistor helps protect the FET from being harmed by any accidental sparks to its Gate lead. The circuit will work fine without this resistor. Just don`t intentionally "zap" the Gate wire with a charged object or your charged finger. To test the....
Installing a small dash mounted 2 speed fan in my motorhome. What`s the best way Use your 1 channel and then find a relay or use the 4 channel and use the seperate wires [1 low spd. &1 high spd ] Any other lideas Would it hurt the unit if it were placed in....
This circuit features automatic Exit and Entry delays - timed bell cut-off - and system reset. It has provision for normally-open and normally-closed switches - and will suit all of the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape,....
Used Zener Diodes to derive the stabilized voltage for the Hartley oscillator (although I did find a couple of suitable voltage stabiliser valves (CV287) whilst sorting through a box of valves this morning). Whilst sniffing around in that box of valves....
About all that can be said about top octave generators is that they were cute and cheap, compared to other methods of tone generation. Trouble is, they were nearly perfect and to use one resulted in chords that were very flat-sounding and on organs, stops....
There are two types of pre-amplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SILICON CHIP. It has the RIAA equalisation network in the feedback loop. The second type was previously....
I`ve had this old amp for about years, and friend of mine has volunteered to do the work to restore it. This is a Webster-Chicago 166-1 amplifier....
The concept behind the light dimmer is to control the voltage to the light lamp or any source. Light dimmers regulate the voltage to the source they are connected to. This regulation of voltage increases or decreases the light intensity. Light dimmers first....
This chapter contains circuit diagrams for several power supplies for pulsed solid state lasers. These include units suitable for driving the popular Hughes ruby and YAG rangefinder laser assemblies as well, one using the flash from a disposable pocket....
The circuit is split into two sections: the isolated external loop which is connected to the remote interface connector on the front of the PSU and the non-isolated inner loop which is connected to the HT (AC line) supply. The two loops are linked by....
The aim of this project was to create a front-end for Commodore 64 emulation using VICE. One of the primary problems with emulators (especially for machines from the `80s) is that there was no standard keyboard arrangement. In this project I took a broken....
This circuit is conventional Pierce type oscillator that uses a JFET. The circuit uses fundamental mode crystals. It has decent performance and reliability if we use a low noise JFET. This is the figure of the circuit. The feedback is controlled by the C1....
When enough light falls on the LDR in this circuit, an alarm tone is played on the loudspeaker. This tutorial shows beginners in electronics how to build the circuit on breadboard step by step....
In this circuit we demonstrate how to use SCRs to control low-voltage pulsating DC to operate homemade LED light panels. While in this circuit I use the Arduino, the concepts should work with any number of micro-controllers using either hardware interrupts....
To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adapters available in the market are generally costl....
This simple AVR Programmer able to transfer hex programs to mostATMEL AVR microcontrollers. It is more reliable than most other simpleAVR programmers available out there and can be built in very shortamount of time. This Programmer support the AVR....
The following circuit is the combination of echo chamber circuit that will make the sound repeated, just like an echo sound when you speak in cave. And the robot voice effect circuit that change the audio signal from input to become sound like a robot voice.....
This circuit delivers an initial voltage of 2.5V per cell to rapidly charge a car battery. The charging current decreases as the battery charges and when t....
Measurement microphones differ from recording microphones and sound meters-they have a flat response, (usually to well below 20 Hz. , and above 20 kHz. , ) and do not have "weighted, " or equalized frequency response. They are also optimized for....
This The multi-purpose Amplifier using TDA2030. It is have power 8 watt (RMS) at 8 ohm loudspeakers. It is have low noise be valuable THD (Total harmonic....
The integrated output amplifier described in this article consists of little more than one integrated circuit. It is intended especially for use in motor vehicles and other battery-operated applications. Although it appears simple and hardly worth looking....
Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply volta....
schematic of board with PIC16F84 and also other PICs which can be connected to this USB PICKit2 programmer If someone has such please show me, i`d appreciate it, thanks. another question is i heard that if i experiment with oscillator ffrequency on my demo....
Lithium-ion battery charging circuit is shown as above. When it starts to charge. The battery voltage is below 8.4V, IC1`s output has no output. Q2 off, LM317 work in the constant current output. When the battery voltage is increased to 8.4V, Q2 turns on, Q2....
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components....
NI Multisim software offers advanced virtual instruments and analyses to help you gain a deeper and more complex understanding of the operation of your design. One of these tools, the measurement probe, can be a quick and functional interface to the....
This Application Note describes the evaluation board for the AD7892-2 12-Bit A/D converter The AD7892-2 is a high speed, low power, 500ksps successive approximation ADC which operates from a single +5V supply. It incorporates an on chip track/hold Amplifier....
As the figure 15-22 shows, the doorbell is composed of the monostable timing circuit, the password switch, the NAND gate circuit and the sound circuit.etc. In the limited time, the circuit uses the program to press the password switch, the doorbell circuit....
This is a simplified version of the 4-Digit Keypad Controlled Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of....
This circuit is composed of a temperature sensor, amplifier, V/F converter, three digit binary coded decimal (BCD) counter, time base and seven segment led displays. In addition to the 9400 V/F converter, other ICs need for this project include the LM334....
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of d....
As many or as few channels as are required can be added to the mixer. Do this by just duplicating the input "sections" which are clearly shown on the schematic. One version of this mixer I saw had 25 inputs! ..
Application note on how to design linear and switch-mode (switching dc-dc converter current source) battery charger applications that require external microcontrollers and related system-level issues for notebook computers....
Back in the day when AM was king, no expense was spared on transmitting equipment. I remember the GE BTA-25 transmitter from the same era, it was build like a tank. Once, while we were repairing the Harris MW-50A main transmitter, the old GE burped,....
There are several ways to convert an AC voltage at a wall receptacle into the DC voltage required by a microcontroller. Traditionally, this has been done w....
A voltage-controlled oscillator or VCO is an electronic oscillator designed to be controlled in oscillation frequency by a voltage input. The frequency of oscillation is varied by the applied DC voltage, while modulating signals may also be fed into the VCO....
The circuit can measure the frequency between 1. 5kHz ~ 500kHz by connecting C1 ~ C6 different capacitors. The maximum frequency is up to 1MHz. Transistor T1 can be used as the integrator, and its load resistor is 15k © resistor and R1 ~~ R6 adjustable....
This circuit will drive a relay coil from a low power output, usually from an IC like 555 or a TTL/CMOS. It is used to switch high loads or loads that needs AC current to operate. The relay will be actuated when the input of the circuit goes high. The....
the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire....
The requirements for electric energy quality of modern industrial development are higher and higher, how to offer the safe and reliable green power to energy consumer is a focus of area research of the power at present. UPS, as a kind of incessant power....
This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to directly drive three coloured LEDs (red, green and amber). At switch-on, the circuit lights the red signal for 30s, then shows green for 6s, then amber for 3s. It....
This project documents how to build and construct your own Brushed Motor ESC for Cars and Boats using a Microchip 12F675 PIC and a small number of standard components. This ESC grew out of an earlier aircraft ESC. A number of people asked for an ESC with....
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.....
The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery. The loud speaker for producing sound is of 0. 5W 8ohm speaker. The circuit will readily generate a rain like sound....
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....
While laying in bed and watching movies on my laptop, I used to think if there is a remote control, it will be easy to pause, play, fwd, rev, adjust volume, play next etc etc without going near to the system. Then I planned to make a remote control. I don`t....
Circuit Making Home Theater 5.1 Surround amplifier schematics Circuit Electronics, Actually, 5.1 channel amplifier consists of 6 amplifiers 1 channel mono, which has certain specifications on each canals. Has 6 channel surround sound ampli....
