New Circuits Page 148
- Page 148
-
I built a simple 1KHz 6Vpp Sine Wave Generator from a handful of opamps and passives I had laying around. You can check out that project here. I thought it would be fun to quantify just how good of a Sine Wave this circuit was; after all it was just a....
-
-
Great idea to remove the core of the HV-transformer, that increases the frequency and the step up rate still seems to be good enough. Do you hear any singing or screeching when your circuit is on I also saw that the spiral type CFLs are specially good for....
-
It is a hansom battery portable radio with a roll top and even today it looks beautiful. When I was first given the radio it didn`t work. It had a burned out detector tube and I had no idea where I`d get a replacement for it. Most importantly, the radio....
-
The Antenna Combiner (A3021) is an active combiner for four 50- © coaxial antenna connections. The output is a combination of the four inputs with net gain of roughly +11 dB. The A3021 is intended for use with four Loop Antennas ( A3015B ), each of which is....
-
-
-
-
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands....
-
This circuit is quickly charging the battery. If you need a faster charger, this circuit is recomended to you. And this charger is low temperature, the temperatur is 5 degree celcius. Input Voltage is 15 Volt DC, and Output voltage to charging 6 -12V and you....
-
No problems turning it on, but after I unload the input (no input current), the triac doesn`t turn off. The load is standard RS-232 voltages (+/- 12V), speed 56k. You mentioned you have already tried using an OptoTriac, so the schematic of how you connected....
-
The following schematic shows the Simple Op-Amp Radio Circuit Diagram taken from bowdenshobbycircuits.info. This Simple Op-Amp Radio is basically a crystal....
-
This electronic circuit diagram is an audio power amplifier based on TDA8571J integrated circuit, class-B output amplifier with four amplifiers in a BTL configuration, each with a gain of 34 dB. Main features of the TDA8571J amplifier circuit are : high....
-
-
-
-
A while ago I was doing some fairly trivial repairs on a Philips portable radio/CD/cassette player. It had a sticker on it claiming that this particular product features something called Dynamic Bass Boost. From the outside this means an extra switch, that....
-
The R-C twin-tee passive circuit supplies band-reject (notch) filtering to portable applications. It has a circuit Q (loaded) of 0. 25. Satisfactory rejection can be achieved when the bridge is balanced (close tolerances of adjustable components) and the....
-
Cheap PIC Programmer This programmer works only with PIC16F84 but it`s great because it never causes errors and works with almost all computers,unlike some....
-
Doing a project to use dsPIC as controller to output PWM signal to control motors. I can use driver IC (I used L293D actually) to simply let motors to rotate, but I cannot control the voltage range to control the motor to rotate with all range of speed...
-
You can download the schematic below. Have a look at it since you will need to match the circuit you are building, to this schematic. It is very like....
-
This hot-air rework station is great for professionals and hobbyists in need of tight temperature tolerances and large air flows. This unit displays a digital readout of the actual air temperature with a flow rate of up to 23L per minute. This very powerful....
-
-
Circuit-delay relay circuit speakers is useful as a delaying / delay on the speaker that functions as a deterrent to prevent pounding of the very first amplifier is turned on. This aims to avoid memperawet speakers easily damaged. The following is a....
-
-
Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charge....
-
-
Each grid is biased to cutoff, so mixer accepts only positive-polarity pulses having sufficient amplitude to overcome this bias. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-2. ..
-
A central door locking system permits all doors, often including the boot lid or tailgate, to be locked centrally from the driver`s door and, normally includes the front passenger`s door also. The locking and unlocking action is produced by an....
-
The RF Combo (A3016) is a combination of three circuits. Its purpose is to provide circuit boards for Stage Four of our subcutaneous transmitter development. The printed circuit board has the same outline as the RF Tester ( A3014 ). The SAW Oscillator....
-
This is the scheme diagram of 500W power inverter circuit which build using 10 pieces of well-known NPN power transistor 2N3055 to amplify the AC signal produced by multivibrator. The frequency generator / multivibrator is built based on transistors too. All....
-
The DE2 board provides both USB host and device interfaces using the Philips ISP1362 single-chip USB controller. The host and device controllers are compliant with the Universal Serial Bus Specification Rev. 2. 0, supporting data transfer at full-speed (12....
-
A 2008 USA Nissan Pathfinder (5N1AR18B28C628086). I live in Toronto, Ontario Canada. One of the many feature my pathfinder has is a power assisted mechanism to close the lift gate (trunk, rear door). About 2 moths ago the above noted mechanisms stop....
-
Feature of an offered frequency meter that he besides the main function allows to define inductance of various coils, resonant frequency of contours, capacity of condensers. The combined device which schematic diagram is shown on fig. 1 becomes the good....
-
When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer is at the....
-
This simple pc scope probe is nothing more than a fet follower. It has a high input impedance and a low output impedance tomatch a mic or line input socket on a pc or laptop. This means it is then practical to examine waveforms under test, for example logic....
-
This is the circuit diagram of a simple three transistor audio amplifier that can deliver around 100mW power to a 25 Ohm speaker. The diodes D1 and D2 provides a constant bias voltage for the transistors Q1 and Q2. The transistor Q1 works as a preamplifier.....
-
This circuit features automatic exit and entry delays - an optional instant alarm zone - an optional intermittent siren output - and an automatic reset. By adding external relays you can immobilize the vehicle and flash the lights. For automatic operation -....
-
Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases if you design the IR transmitter for reliable operation over a longer range, say, 10 metres. To double the range from 5 metres to 10 metres, you need to....
-
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
-
The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where you can plug-in your 120V AC appliance and control....
-
Xenon lamp, strobe light circuits, xenon strobe, photo flash, photoflash,schematics or diagrams, all free to use. My inspiration came from a strobe circuit that was in a school fire alarm....
-
The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this....
-
Light emitting diodes are advan- tageous due to their smaller size, low current consumption and catchy colours they emit. Here is a running message display circuit wherein the letters formed by LED arrangement light up progressively. Once all the letters of....
-
All ATL-3 loop windings are centre tapped and balanced w. r. t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e. g. televisions and the electric meter box, or....
-
-
A switch-mode power supply provides ±15V or ±12V @ 0.5A output from a 4.5V to 12V input Wide input voltage range allows flexibility to be powered from a regulated DC voltage....
-
An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D2 is a varactor diode. Audio fed to D2 causes FM of the oscillator signal. L1 is 1/2 turns of #18 wire on a....
-
ADC (Analogto digital converter) forms a very essential part in many embedded projects and this article is about interfacing an ADC to 8051 embedded controller. ADC 0804 is the ADC used here and before going through the interfacing procedure, we must neatly....
-
This circuit is designed to check the condition of lead-acid and gel cell batteries with capacities greater than 20Ah. It switches a load of about 18A at a rate close to 50Hz so that the internal resistance of the battery can be measured using a digital....
-
The most important part of this 88-108 transmitter is the Colpitts oscillator. C3,C4,C5,C6,CD1-CD2 ans L1 determine the transmission frequency. The RF Osci....
-
The helium-neon laser requires two voltages: a voltage in the range of 10 kV that starts the laser and then turns off once the discharge begins, and a lower-voltage power supply to sustain the dis-charge. The circuit diagram illustrates one method of....
-
This discussion covers 3 different Xenon flashing circuits from disposable cameras. From them, you will learn circuit tricks that have NEVER been shown in any theory book.The first circuit covers 6 BUILDING BLOCKS.You will need an old disposable Flash Camera....
-
Initially I chose another infrared sensor for test, PIR Motion Sensor, which was to detect any motion in front of the sensor but it turened out not so sensitive. So that I looked at this QRD1114 IR Sensor for substitute. In this test, I used both as digital....
-
This power supply is designed for amateurs, and has been in operation for over 10 years. Its design is very simple and practically immune to RF. It brings together the individual pieces, is the most expensive part of 600VA toroidal transformer, which can be....
-
Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fuse failure or power breakdown in the equipment going unnoticed may cause irreparable loss. The monitor sounds an alarm....
-
The STI7167 uses state-of-the-art process technology to provide a fully featured HD AVC DVB-C and DVB-T Demodulator and decoder IC. It is a highly integrated system-on-chip suitable for STB markets across cable, terrestrial, and terrestrial/IP hybrid....
-
This note will review the process by which VCO (Voltage Controlled Oscillator) designers choose their oscillator`s topology and devices based on performance requirements, components types and DC power requirements. Basic oscillator design specifications....
-
A phase-shift audio oscillator with excellent distortion characteristics thanks to "softened" diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion, increase the 68 ohm....
-
Park Aid Three LEDs signal bumper-barrier distance Infra-red operation, indoor use Circuit diagram: Parts: R1 10K 1/4W Resistor R2,R5,R6,R9 1K 1/4W Resistors R3 33R 1/4W Resistor R4,R11 1M 1/4W Resistors R7 4K7 1/4W Resistor R8 1K5 1/4W Res....
-
This circuit liquid level sensor is using a simple and common operational amplifier IC 741 used as a comparator. When the sensor two-fluid levels (you can use two small pieces of PCB or drivers of some of them) are not found in the fluid of the output....
-
This wireless FM microphone is simple to build and it has a useful transmitting range (over 300 meters in the open air). Despite its small component count and a 3V operating voltage it will easily penetrate over three floors of an apartment building. It may....
-
The example circuit is for an automatic animal feeder. When the animal pushes the switch the PICAXE microcontroller detects an input. The programme within the microcontroller then outputs at pin 6, energising a relay. This allows a second circuit to turn on....
-
The circuit are suited for high precision extended temperature service if V+ is reasonably constant since IZ is dependent on V+. R1, R2, R3, and R4 are chosen to provide the proper IZ for minimum T. C. and to minimize errors due to Ibias. The circuits shown....
-
This is a simple device designed to control supply voltage +5 V Monitor provides information signals TTL level, accompanied by the LED display, indicating that stress or deviated from the nominal value, or vice versa, is in a box . The basis of the device....
-
The following circuit shows about Mini Audio Mixer With Level Control Circuits. Features: with switchable high/low sensitivity, providing high ....
-
This circuit is essentially an amplified crystal set. The inductor could be a standard AM radio ferrite rod antenna while the tuning capacitor is a variable plastic dielectric gang, intended for small AM radios. The aerial tuned circuit feeds diode D1 which....
-
The output of condenser mic is coupled via a coupling capacitor of 0. 1 µF, the purpose of this capacitor is to remove DC contents in the audio signal. Transistor Q1 is configured as collector to base biasing mode. This is accomplished via 470k © resistance.....
-
The gas furnace is the simplest to operate and understand. Therefore, we will use it here to look at a typicalheating system. This type of natural-gas furnace is used to heat millions of homes in the United States. Note the location of theblower switch and....
-
-
This circuit is especially designed for those who often need to wake up early in the morning. Ordinary alarms in electronic watches are not loud enough an....
-
Since I first got my Arduino and some RGB LEDs I`d wanted to build myself a mood lamp with some funky features (note that I used the word funky and not useful). Well, I`ve finally done it, and here is the blog post describing how. For this project I used the....
-
Circuit generates low-frequency waveform whose amplitude is equivalent to that of unknown r-f voltage, using photochopper modulator VI-V2 as error detector. Arrangement gives seven voltage ranger from 10 my rms to 10 v rms full scale, over frequency range of....
-
Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials - take for example the USB powered teacup warmer; this device is obviously an invaluable productivity tool for all users but....
-
To compile this software just copy and paste it into any current or newer version of arduio software. To compile to check for error click the play like button and wait for the software to process. If any errors is found, it should indicated at the bottom of....
-
The important allotment of the circuit is formed of the Colpitts blazon oscillator. C3, C4, C5, C6, CD1-CD2 and L1 determines the frequency. BF982 and bifold aboideau MOSFET are alive genitalia in oscillator. When the ascribe impedance of the MOSFET aboideau....
-
The reason being is that I would like to use the sensor as a force sensor. I noticed that the harder I press it, the higher a voltage it delivers (but for a very short time). This is expected behavior, of course. What I am wondering is how I would connect it....
-
V-USB is a software-only implementation of a low-speed USB device for Atmel`s AVR ® microcontrollers, making it possible to build USB hardware with almost any AVR ® microcontroller, not requiring any additional chip. Supports multiple endpoints: one control....
-
The wah will work before the amplifier but sounds very low in volume and it sounds scratchy when the wah is rocked back and forth. The wah is fine without the buffer. In front of a fuzz face, with the fuzz face on, no sound passes Bizarre indeed. I`m going....
-
The right leg driver circuit is where many amplifier board circuits common signals are summed and inverted though the Right Leg Driver circuit & sent back to the body to cancil out common voltages. This ground point could be a ear lobe. Their also is a 3....
-
The ISL5929 is a dual 14-bit, 130/210+MSPS (Mega Samples Per Second), CMOS, high speed, low power, D/A (digital to analog) converter, designed specifically for use in high performance communication systems such as base transceiver stations utilizing 2. 5G or....
-
The 555 can be almost any type, they are all pin-compatible. Although some CMOS types may not have enough power to drive the transistor, in that case use an ordinary 555. C1`s working voltage should be increased to 25V if you decide to go with a 12V power....
-
This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car`s LED light show. The Q1 amplify the audio from mic. The R1 is used....
-
There are monitors which only have three BNC inputs and which use composite synchronization (sync on green`). This circuit has been designed with these types of monitor in mind. As can be seen, the circuit has been kept very simple, but it still gives a....
-
-
This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio....
-
This is an easy to build X-Y oscilloscope. To try this an ATmega324P and two KAD0820 (same as National Semiconductor`s ADC0820 ) were used. Originally this oscilloscope was built around an AT90S4414 hence the external AD converters. Some rose and Lissajous....
-
Using a the controlled-half-plus-fixed-half-wave phase control method, this circuit can regulate an 860 a watt lamp load from half to full power. This circuit control the light output of the lamp from 30% to 100% because Half power applied to an incandescent....
-
The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit di....
-
-
The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge is a good 1.5 V,....
-
This is flashing blinks circuit, 12V sizes. By use fluorescent lamp the small-sized.It live the work of relay perform be the circuit modifies from DC to be....
-
This circuit is based on the 7240 CMOS programmable timer chip (IC3), which has an accuracy of 0. 5 percent. It contains a time-base generator, the frequency of which is decided by a resistor and a capacitor. The basic time period is RC seconds; so, given....
-
This is a circuit design for high current toggle switch. This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is useful where the load needs to be switched on from one location and switched off from another. Any number....
-
The term Arduino actually refers to a system of components that include the board, the microcontroller, the boot-loader, and the programming environment. It is a system designed to `protect` the user from a lot of the complication that is part of....
-
-
This circuit has an advantage in that almost all of the energy in the collapsing magnetic field of L2 is transferred to C2. Where as in a normal Joule thief some of this energy is returned to the battery. This is a result of the resistor VR2 preventing rapid....
-
Hello, I have queastion about type of the osclator I found on wikipedia here: File:NPN Colpitts oscillator collector coil.png - Wikipedia, the free....
-
I have an automotive relay (from a scan of a workshop manual I`m afraid) which is rather more complexly wired up than the relays I`m familiar with. In this diagram: B/G - holds high if another condition is met (engine temp too high), to prevent the relay....
-
The PC parallel port can be easily damaged by wiring mistakes, short circuits or the circuits you connect to it. If the parallel port is integrated into the motherboard, as is the case with most computers repairs can be expensive. You can buy inexpensive I/O....
-
The clock shows time in 5 minute intervals. The hour and minute can be set. There is no alarm or any AM/PM indicator. For the clock face I used a 2 pieces of lenolium glued together to increase thickness. (A couple of floor tiles would work as well. ) The....
-
You "see" colors, geometry, distance, spatial continuity and discontinuity, motion, connectedness and adjacency. These notions are built into the ways in which you experience and think about the world. You interpret the information returned to your senses....
-
In this article, we will connect a stepper motor to our computer`s parallel port, and then we will write some code to control it with the scroll wheel on a mouse ( video ). If you have never worked with stepper motors, you will surely have a lot of fun with....
I built a simple 1KHz 6Vpp Sine Wave Generator from a handful of opamps and passives I had laying around. You can check out that project here. I thought it would be fun to quantify just how good of a Sine Wave this circuit was; after all it was just a....
It is a hansom battery portable radio with a roll top and even today it looks beautiful. When I was first given the radio it didn`t work. It had a burned out detector tube and I had no idea where I`d get a replacement for it. Most importantly, the radio....
The Antenna Combiner (A3021) is an active combiner for four 50- © coaxial antenna connections. The output is a combination of the four inputs with net gain of roughly +11 dB. The A3021 is intended for use with four Loop Antennas ( A3015B ), each of which is....
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands....
This circuit is quickly charging the battery. If you need a faster charger, this circuit is recomended to you. And this charger is low temperature, the temperatur is 5 degree celcius. Input Voltage is 15 Volt DC, and Output voltage to charging 6 -12V and you....
No problems turning it on, but after I unload the input (no input current), the triac doesn`t turn off. The load is standard RS-232 voltages (+/- 12V), speed 56k. You mentioned you have already tried using an OptoTriac, so the schematic of how you connected....
The following schematic shows the Simple Op-Amp Radio Circuit Diagram taken from bowdenshobbycircuits.info. This Simple Op-Amp Radio is basically a crystal....
This electronic circuit diagram is an audio power amplifier based on TDA8571J integrated circuit, class-B output amplifier with four amplifiers in a BTL configuration, each with a gain of 34 dB. Main features of the TDA8571J amplifier circuit are : high....
A while ago I was doing some fairly trivial repairs on a Philips portable radio/CD/cassette player. It had a sticker on it claiming that this particular product features something called Dynamic Bass Boost. From the outside this means an extra switch, that....
The R-C twin-tee passive circuit supplies band-reject (notch) filtering to portable applications. It has a circuit Q (loaded) of 0. 25. Satisfactory rejection can be achieved when the bridge is balanced (close tolerances of adjustable components) and the....
Cheap PIC Programmer This programmer works only with PIC16F84 but it`s great because it never causes errors and works with almost all computers,unlike some....
Doing a project to use dsPIC as controller to output PWM signal to control motors. I can use driver IC (I used L293D actually) to simply let motors to rotate, but I cannot control the voltage range to control the motor to rotate with all range of speed...
You can download the schematic below. Have a look at it since you will need to match the circuit you are building, to this schematic. It is very like....
This hot-air rework station is great for professionals and hobbyists in need of tight temperature tolerances and large air flows. This unit displays a digital readout of the actual air temperature with a flow rate of up to 23L per minute. This very powerful....
Circuit-delay relay circuit speakers is useful as a delaying / delay on the speaker that functions as a deterrent to prevent pounding of the very first amplifier is turned on. This aims to avoid memperawet speakers easily damaged. The following is a....
Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charge....
Each grid is biased to cutoff, so mixer accepts only positive-polarity pulses having sufficient amplitude to overcome this bias. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-2. ..
A central door locking system permits all doors, often including the boot lid or tailgate, to be locked centrally from the driver`s door and, normally includes the front passenger`s door also. The locking and unlocking action is produced by an....
The RF Combo (A3016) is a combination of three circuits. Its purpose is to provide circuit boards for Stage Four of our subcutaneous transmitter development. The printed circuit board has the same outline as the RF Tester ( A3014 ). The SAW Oscillator....
This is the scheme diagram of 500W power inverter circuit which build using 10 pieces of well-known NPN power transistor 2N3055 to amplify the AC signal produced by multivibrator. The frequency generator / multivibrator is built based on transistors too. All....
The DE2 board provides both USB host and device interfaces using the Philips ISP1362 single-chip USB controller. The host and device controllers are compliant with the Universal Serial Bus Specification Rev. 2. 0, supporting data transfer at full-speed (12....
A 2008 USA Nissan Pathfinder (5N1AR18B28C628086). I live in Toronto, Ontario Canada. One of the many feature my pathfinder has is a power assisted mechanism to close the lift gate (trunk, rear door). About 2 moths ago the above noted mechanisms stop....
Feature of an offered frequency meter that he besides the main function allows to define inductance of various coils, resonant frequency of contours, capacity of condensers. The combined device which schematic diagram is shown on fig. 1 becomes the good....
When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer is at the....
This simple pc scope probe is nothing more than a fet follower. It has a high input impedance and a low output impedance tomatch a mic or line input socket on a pc or laptop. This means it is then practical to examine waveforms under test, for example logic....
This is the circuit diagram of a simple three transistor audio amplifier that can deliver around 100mW power to a 25 Ohm speaker. The diodes D1 and D2 provides a constant bias voltage for the transistors Q1 and Q2. The transistor Q1 works as a preamplifier.....
This circuit features automatic exit and entry delays - an optional instant alarm zone - an optional intermittent siren output - and an automatic reset. By adding external relays you can immobilize the vehicle and flash the lights. For automatic operation -....
Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases if you design the IR transmitter for reliable operation over a longer range, say, 10 metres. To double the range from 5 metres to 10 metres, you need to....
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where you can plug-in your 120V AC appliance and control....
Xenon lamp, strobe light circuits, xenon strobe, photo flash, photoflash,schematics or diagrams, all free to use. My inspiration came from a strobe circuit that was in a school fire alarm....
The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this....
Light emitting diodes are advan- tageous due to their smaller size, low current consumption and catchy colours they emit. Here is a running message display circuit wherein the letters formed by LED arrangement light up progressively. Once all the letters of....
All ATL-3 loop windings are centre tapped and balanced w. r. t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e. g. televisions and the electric meter box, or....
A switch-mode power supply provides ±15V or ±12V @ 0.5A output from a 4.5V to 12V input Wide input voltage range allows flexibility to be powered from a regulated DC voltage....
An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D2 is a varactor diode. Audio fed to D2 causes FM of the oscillator signal. L1 is 1/2 turns of #18 wire on a....
ADC (Analogto digital converter) forms a very essential part in many embedded projects and this article is about interfacing an ADC to 8051 embedded controller. ADC 0804 is the ADC used here and before going through the interfacing procedure, we must neatly....
This circuit is designed to check the condition of lead-acid and gel cell batteries with capacities greater than 20Ah. It switches a load of about 18A at a rate close to 50Hz so that the internal resistance of the battery can be measured using a digital....
The most important part of this 88-108 transmitter is the Colpitts oscillator. C3,C4,C5,C6,CD1-CD2 ans L1 determine the transmission frequency. The RF Osci....
The helium-neon laser requires two voltages: a voltage in the range of 10 kV that starts the laser and then turns off once the discharge begins, and a lower-voltage power supply to sustain the dis-charge. The circuit diagram illustrates one method of....
This discussion covers 3 different Xenon flashing circuits from disposable cameras. From them, you will learn circuit tricks that have NEVER been shown in any theory book.The first circuit covers 6 BUILDING BLOCKS.You will need an old disposable Flash Camera....
Initially I chose another infrared sensor for test, PIR Motion Sensor, which was to detect any motion in front of the sensor but it turened out not so sensitive. So that I looked at this QRD1114 IR Sensor for substitute. In this test, I used both as digital....
This power supply is designed for amateurs, and has been in operation for over 10 years. Its design is very simple and practically immune to RF. It brings together the individual pieces, is the most expensive part of 600VA toroidal transformer, which can be....
Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fuse failure or power breakdown in the equipment going unnoticed may cause irreparable loss. The monitor sounds an alarm....
The STI7167 uses state-of-the-art process technology to provide a fully featured HD AVC DVB-C and DVB-T Demodulator and decoder IC. It is a highly integrated system-on-chip suitable for STB markets across cable, terrestrial, and terrestrial/IP hybrid....
This note will review the process by which VCO (Voltage Controlled Oscillator) designers choose their oscillator`s topology and devices based on performance requirements, components types and DC power requirements. Basic oscillator design specifications....
A phase-shift audio oscillator with excellent distortion characteristics thanks to "softened" diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion, increase the 68 ohm....
Park Aid Three LEDs signal bumper-barrier distance Infra-red operation, indoor use Circuit diagram: Parts: R1 10K 1/4W Resistor R2,R5,R6,R9 1K 1/4W Resistors R3 33R 1/4W Resistor R4,R11 1M 1/4W Resistors R7 4K7 1/4W Resistor R8 1K5 1/4W Res....
This circuit liquid level sensor is using a simple and common operational amplifier IC 741 used as a comparator. When the sensor two-fluid levels (you can use two small pieces of PCB or drivers of some of them) are not found in the fluid of the output....
This wireless FM microphone is simple to build and it has a useful transmitting range (over 300 meters in the open air). Despite its small component count and a 3V operating voltage it will easily penetrate over three floors of an apartment building. It may....
The example circuit is for an automatic animal feeder. When the animal pushes the switch the PICAXE microcontroller detects an input. The programme within the microcontroller then outputs at pin 6, energising a relay. This allows a second circuit to turn on....
The circuit are suited for high precision extended temperature service if V+ is reasonably constant since IZ is dependent on V+. R1, R2, R3, and R4 are chosen to provide the proper IZ for minimum T. C. and to minimize errors due to Ibias. The circuits shown....
This is a simple device designed to control supply voltage +5 V Monitor provides information signals TTL level, accompanied by the LED display, indicating that stress or deviated from the nominal value, or vice versa, is in a box . The basis of the device....
The following circuit shows about Mini Audio Mixer With Level Control Circuits. Features: with switchable high/low sensitivity, providing high ....
This circuit is essentially an amplified crystal set. The inductor could be a standard AM radio ferrite rod antenna while the tuning capacitor is a variable plastic dielectric gang, intended for small AM radios. The aerial tuned circuit feeds diode D1 which....
The output of condenser mic is coupled via a coupling capacitor of 0. 1 µF, the purpose of this capacitor is to remove DC contents in the audio signal. Transistor Q1 is configured as collector to base biasing mode. This is accomplished via 470k © resistance.....
The gas furnace is the simplest to operate and understand. Therefore, we will use it here to look at a typicalheating system. This type of natural-gas furnace is used to heat millions of homes in the United States. Note the location of theblower switch and....
This circuit is especially designed for those who often need to wake up early in the morning. Ordinary alarms in electronic watches are not loud enough an....
Since I first got my Arduino and some RGB LEDs I`d wanted to build myself a mood lamp with some funky features (note that I used the word funky and not useful). Well, I`ve finally done it, and here is the blog post describing how. For this project I used the....
Circuit generates low-frequency waveform whose amplitude is equivalent to that of unknown r-f voltage, using photochopper modulator VI-V2 as error detector. Arrangement gives seven voltage ranger from 10 my rms to 10 v rms full scale, over frequency range of....
Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials - take for example the USB powered teacup warmer; this device is obviously an invaluable productivity tool for all users but....
To compile this software just copy and paste it into any current or newer version of arduio software. To compile to check for error click the play like button and wait for the software to process. If any errors is found, it should indicated at the bottom of....
The important allotment of the circuit is formed of the Colpitts blazon oscillator. C3, C4, C5, C6, CD1-CD2 and L1 determines the frequency. BF982 and bifold aboideau MOSFET are alive genitalia in oscillator. When the ascribe impedance of the MOSFET aboideau....
The reason being is that I would like to use the sensor as a force sensor. I noticed that the harder I press it, the higher a voltage it delivers (but for a very short time). This is expected behavior, of course. What I am wondering is how I would connect it....
V-USB is a software-only implementation of a low-speed USB device for Atmel`s AVR ® microcontrollers, making it possible to build USB hardware with almost any AVR ® microcontroller, not requiring any additional chip. Supports multiple endpoints: one control....
The wah will work before the amplifier but sounds very low in volume and it sounds scratchy when the wah is rocked back and forth. The wah is fine without the buffer. In front of a fuzz face, with the fuzz face on, no sound passes Bizarre indeed. I`m going....
The right leg driver circuit is where many amplifier board circuits common signals are summed and inverted though the Right Leg Driver circuit & sent back to the body to cancil out common voltages. This ground point could be a ear lobe. Their also is a 3....
The ISL5929 is a dual 14-bit, 130/210+MSPS (Mega Samples Per Second), CMOS, high speed, low power, D/A (digital to analog) converter, designed specifically for use in high performance communication systems such as base transceiver stations utilizing 2. 5G or....
The 555 can be almost any type, they are all pin-compatible. Although some CMOS types may not have enough power to drive the transistor, in that case use an ordinary 555. C1`s working voltage should be increased to 25V if you decide to go with a 12V power....
This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car`s LED light show. The Q1 amplify the audio from mic. The R1 is used....
There are monitors which only have three BNC inputs and which use composite synchronization (sync on green`). This circuit has been designed with these types of monitor in mind. As can be seen, the circuit has been kept very simple, but it still gives a....
This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio....
This is an easy to build X-Y oscilloscope. To try this an ATmega324P and two KAD0820 (same as National Semiconductor`s ADC0820 ) were used. Originally this oscilloscope was built around an AT90S4414 hence the external AD converters. Some rose and Lissajous....
Using a the controlled-half-plus-fixed-half-wave phase control method, this circuit can regulate an 860 a watt lamp load from half to full power. This circuit control the light output of the lamp from 30% to 100% because Half power applied to an incandescent....
The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit di....
The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge is a good 1.5 V,....
This is flashing blinks circuit, 12V sizes. By use fluorescent lamp the small-sized.It live the work of relay perform be the circuit modifies from DC to be....
This circuit is based on the 7240 CMOS programmable timer chip (IC3), which has an accuracy of 0. 5 percent. It contains a time-base generator, the frequency of which is decided by a resistor and a capacitor. The basic time period is RC seconds; so, given....
This is a circuit design for high current toggle switch. This circuit was adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is useful where the load needs to be switched on from one location and switched off from another. Any number....
The term Arduino actually refers to a system of components that include the board, the microcontroller, the boot-loader, and the programming environment. It is a system designed to `protect` the user from a lot of the complication that is part of....
Hello, I have queastion about type of the osclator I found on wikipedia here: File:NPN Colpitts oscillator collector coil.png - Wikipedia, the free....
I have an automotive relay (from a scan of a workshop manual I`m afraid) which is rather more complexly wired up than the relays I`m familiar with. In this diagram: B/G - holds high if another condition is met (engine temp too high), to prevent the relay....
The PC parallel port can be easily damaged by wiring mistakes, short circuits or the circuits you connect to it. If the parallel port is integrated into the motherboard, as is the case with most computers repairs can be expensive. You can buy inexpensive I/O....
The clock shows time in 5 minute intervals. The hour and minute can be set. There is no alarm or any AM/PM indicator. For the clock face I used a 2 pieces of lenolium glued together to increase thickness. (A couple of floor tiles would work as well. ) The....
You "see" colors, geometry, distance, spatial continuity and discontinuity, motion, connectedness and adjacency. These notions are built into the ways in which you experience and think about the world. You interpret the information returned to your senses....
In this article, we will connect a stepper motor to our computer`s parallel port, and then we will write some code to control it with the scroll wheel on a mouse ( video ). If you have never worked with stepper motors, you will surely have a lot of fun with....
