New Circuits Page 63
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Remote control circuit consists of two parts, one is the transmitter and the other is the receiver. A simple schematic diagram of the remote control. IC transmitter transmitter circuit is controlled by NE555. Receiver circuit works by the frequency of the....
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Post related to Do it yourself about become a VU meter and homemade rhythm lights easy....
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In many cases, the dimmer presented here may be built into a wall-mounted box containing the light switch. It is intended for use with 240 V incandescent lamps only. When it is fitted, and the light is switched on, the lamp does not come on fully for about....
-
This is an implementation of the L298 to drive motors and inductive loads up to 4A continuously. Initially the L298 contains two separate channels, each one capable of driving 2A loads. Connecting them in parallel as in the schematic makes a single 4A....
-
This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings....
-
This circuit shows about Ne7555 Timer For Light Sensitive Alarm Sensor Circuit Diagram. Features: detects a sudden shadow falling on the ....
-
-
Accessories built so far include a linear power supply, a switchmode power supply, a tuning aid, and a headset. An antenna tuner and SWR meter will be described later. In order to operate the new transceiver, I needed a power supply. I began by building a....
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-
-
-
Afroman covers the basics of how transformers work, where to shop for step down mains transformers, and how to wire one up to mains voltages without killing yourself. European and North American wiring is discussed. He finishes up with a quick example of AC....
-
-
Circuit Fear not, dear reader - I haven`t given up the sauce. I am not in withdrawal, suffering severe autonomic instability. I refer not to Delirium Tremens, but to time differences, dt. Specifically to the "DT" data column in the WSPR GUI. Everything was....
-
This is a nice LFO for all of your modulation needs. The frequency can be voltage controlled to add a new dimension to your sound palette. The pulse width of the rectangle wave can be varied between approximately 10% and 90% again lending variability to the....
-
This is a fun and non-dangeros project for those people who like to throw projectiles magnetically. It simply works by placing a ferromagnetic projectile at one end of a coil and pulsing some power in it. The trick is to switch off power when the projectile....
-
-
A Direct-Coupled 6V6 Tube Amplifier with Cathode Follower by Raymond H. Bates from Radio & Television News magazine November 1949..
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This optodetector measures the position of the ball by the amount of light transmitted by the infrared LED. This is a linear signal across the small area of the detector - it is not just "on" and "off". This circuit creates a control signal from the two....
-
This is a simple preamplifier circuit for electret condenser microphone. using a LM1458 dual op amp IC. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn`t....
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that used a SRPP (shunt-regulated PP) driver stage I started to do some research and modeling on a SRPP. The advantages of such a line stage are much the same as those when a SRPP is used as a driver. Good linearity, low distortion, low impedance output,....
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-
-
Used to delay beginning of crt sweep for expanded display. Provides three ranges: 0 to 5, 60, and 200 miles. Circuit is basically cathode-coupled phantastron, with additional coupling by returning suppressor and screen to same divider. Cathode follower....
-
-
-
The USB standard restricts the current consumption of all USB devices to either 100mA or 500mA depending on the specifics of the USB hub and/or host controller (i. e. computer) that is supplying the power. Ideally, no USB device should ever pull more than....
-
-
The FM radio receiver with PLL designed by A. Zaharov [1] still attracts the attention of radio amateurs. As noted in a publication of the magazine "Radio" [2, 3], one of the major drawbacks of this type of detectors is the low adjacent channel selectivity.....
-
This is a simple servo tester which will comprehensively test the capabilities of almost any modern servo. It has two pushbuttons, CENTRE and SWEEP and a potentiometer which works as follows:..
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The analog input is first fed into a fast non-inverting buffer amplifier (OPA353) set up for unity gain which protects the analog-to-digital converter from out-of-range voltages. The ADS830 is a fairly cheap 8-bit analog-to-digital converter which supports....
-
This is a schematic diagram of a pulse width to analog demodulator circuit. This circuit is used to demodulate the pulse width to analog voltage level. With...
-
The dc path is from the negative side (ground) of VCC through RE, Q1, T1, and back to the positive side of VCC. The figure clearly illustrates that both the ac and dc components flow through the tank circuit...
-
This circuit is a circuit diagram is included in the RF circuit. FM Transmitter circuit diagram using the IC BH1417. Where the integrated circuit design from RHOM which includes many features in one small package. He came with pre-emphasis, limiter so that....
-
In this article, I`ll show you how to create a simple yet effective way of scaring off intruders. Of course, there are methods around this approach, but it`s great for office pranks and general fun. The project requires a little background knowledge in....
-
-
-
The circuit in the diagram was originally designed to monitor an oscillator, but can also be used as a general-purpose level indicator for a. c. signals. It is based on a quadruple IC containing four NAND gates. Only three of the gates are used, making the....
-
This type of voltmeter is very common because of its low cost. This instrument can be used only to measure voltages of the order of milli-volts owing to limited amplifier gain. The circuit diagram for a direct coupled am plifier dc voltmeter using cascaded....
-
I hate to suggest the specific application `bicycle` because it may be use to protect many items from theft. This anti-theft alarm project is built around....
-
This experiment may be built using only one 8-position DIP switch, but the concept is easier to understand if two switch assemblies are used. The idea is, one switch acts to hold the correct code for unlocking the lock, while the other switch serves as a....
-
Output transformer core: coming from flea market, light blue color, marked as A-438281-2-9H9-3, OD = 47 mm, ID = 24 mm, height = 13 mm. No information about µ Mosfet to be used: coming from flea market, with the following characteristics. It`s an obsolete....
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A very simple direct conversion receiver based on the NE602 Gilbert Cell mixer and a LM386 audio amplifier. The circuit is based onthe famoussudden receiver design from the Rev George Dobbs G3RJV many years ago and looks something like this: My....
-
30W Class AB power amplifier circuit diagram using power transistor. Set the above amplifier up by adjust the variable resistor R1 to maximum and R12 to zero. After this set up is done, the activate / turn on the amplifier. Adjust the R1 so that the measured....
-
-
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-....
-
This device is designed to measure the torque in an automobile drive shaft and provide an output to a vehicle data recording system or a portable computer via an RS-232 interface. The received data can then be combined with RPM measurements from the data....
-
The schematic for this project flows naturally from left to right. Beginning at the antenna and the regenerative receiver front-end, then flowing through the amplification stages and then into the 555 timer. This is a very common regenerative receiver....
-
The LC72146 is a PLL Frequency Synthesizer LSI circuit for electronic tuning in car stereo systems. The LC72146 supports the construction of high-performance, multi- functional electronic tuning systems for the VHF MW, and LW bands. By Sanyo Semiconductor....
-
Below is the schematic diagram of an audio input module. We can produce a DC output voltage that is proportional to the input signal amplitude (the signal....
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The circuit below illustrates how to build your own daq_lite - also shown is a photo of a completed PCB board. Note that the 80mA fuse shown in the photo and the protection diode close to it are recommended but not necessary. Once you`ve built the circuit....
-
Controlling the speed of three phase ac motor is done by controlling the frequency of the power line supply, since the motor is synchronized with the line frequency. Three phase ac motor speed controller is actually nothing more than three phase sine wave....
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a single-line diagram of the ship`s service generator and switchboard connections for a destroyer. Component: Resistor, Capacitor, Transistor, ....
-
The SC9256 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers. All functions ate controlled through 3 serial bus lines. These LSIs are used to configure high-performance digital tuning system. By Silan ..
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This tube tesla coil was built inside a CPU power supply unit. It was first built on a workbench using components and jumpers for connections. The tube used is a 4X150 transmitting tube that used forced air cooling. An old oscilloscope transformer was used....
-
This simple fm radio receiver circuit consists of a regenerative rf stage, TR1, followed by a two of three-stage audio amplifier, TR2 to TR4. In some areas....
-
This circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffered and amplified by the IC1 prepared to redistribute. It has 3 outputs to drive 3 audio lines with....
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If you haven`t already read my CT-100 restoration article, I suggest that you start there. It chronicles how I found a CT-100 and restored it to working condition. This article discusses what`s under the hood. After noting some hardware highlights, we`ll....
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-
Audio Light Modulator. Audio light modulations add to the enjoyment of music during functions organised at home or outdoors. Presented here is one such simple circuit in which...
-
-
Colpitts oscillator can be implemented using op-amp as long as we have an op-amp with proper bandwidth. Here is an example of such circuit: LT1190 or LT1191....
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My audio source will be a Line Level Audio -2V to +2V AC passed through a 220uF coupling cap and then a low pass filter(RC, 2 pole). The signal will be read by an ADC another one that i have seen is I don`t quite understand this FET-BJT preamp circuit And....
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This is a glove that plays a very competitive game of Rock Paper Scissors against the wearer. It learns how they wearer plays and plays to their weaknesses. Why I`m nottotallysure. Chasing down the source of inspiration is often impossible, but sometimes a....
-
Here the simple file alarm circuit based timer ID NE555. The works is simple, the lamp give light to the LDR (Light Depending Resistor) as light sensor. When the light from the lamp covered with smoke then the LDR will change its resistance value and then....
-
The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf....
-
This page is going to describe the parts, schematic, softw1are, and some tips on using Infrared for object detection. The parts used are typically the same parts found in most consumer electronic remote controls, and are widely available. If you have an old....
-
In operation, the alarm circuit allows a 0-47 second time delay, as determined by the R1/C1 combination, after the switch is armed to allow the vehicle`s motion sensor to settle down. This allows you time to get a bag of groceries out of the trunk and not....
-
-
The circuit turns on a light corresponding to the first of several buttons pressed in a "Who`s First" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps....
-
Several easy modifications for a Dataq DI-194RS and DI-154RS. There are at least two different styles: the kind that come packaged (shown) and the kind that come as an unpackaged PCB. The unpackaged ones are what you get when you are fortunate enough to get....
-
This resource contains step to step information to make AVR microcontroller programmer with suitable circuit diagram. This programmer able to program 8051, AT89XX, AT90XXXX, 8031 family microcontrollers....
-
A method of determining altitude is by the use of barometric pressure; however, it is not done without difficulty. The relationship of pressure vs. altitude is not a linear one, it is actually a fairly complex one, which the army came up with in the 1930`s.....
-
Here is a project Device switching using password by innovative group Dreamlover technology, lets the user to lock their device with password. The block diagram of device switching using password is shown in figure 1. As the circuit device switching using....
-
-
This is a simple JFET input buffer that goes into a clean boost based on the old Electro-Harmonix LPB-1 Linear Power Boost. The guitar input is buffered and then split off to four input points. These input points can then go on to various other modules in....
-
Detection systems are a key component of any imaging system, and an understanding of their properties is important for establishing appropriate operating criteria or designing schemes for obtaining quantitative information. In this section scintillation....
-
Here is a simple IR headphone circuit that is suitable for listening to TV or radio with out disturbing others. For beginners the IR headset is a better option than FM head sets because they often produce desirable sound quality with out tuning as well as....
-
-
This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although....
-
Wrap hundreds of turns of magnet wire around the paper tube. Connect this home-made inductor in series with an AC power supply and lamp to form a circuit. When the tube is empty, the lamp should glow brightly. When the steel bar is inserted in the tube, the....
-
Has high input impedance und low output impedance, to reduce droop in output voltage between pulses. Staircase is generated by pump D2-C2, which is boostrapped on output to maintain equal amplitude on each step. Circuit values shown give 10 steps with 12-V....
-
This circuit uses a digital pot to allow the microcontoller to automatically adjust the gain of the circuit to suit the ambient audio volume, but you could replace this with a standard pot if this isn`t needed. The low pass filter is a copy of Graham....
-
-
This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It`s a fairly powerful SE amp that works very well. It uses a single pentode as the driver (a 12HG7 video amp tube), and a solid-state power supply with....
-
A solar cell radio used a 3V (or two 1.2V) Ni-Cad battery in it. The battery can not be removed. It use a mini jack socket for charging. Its quiet difficult...
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-
-
-
-
-
Typically the input protection fuse of your DMM will blow in the middle of a demonstration or an exciting phase of your construction work. Spare fuses are always hard to find, and if available take a lot of time to install. This circuit replaces the fuse by....
-
Need to know where is the phisical location of the compressor relay. Also do you know how to test the pressure sensor on the plastic tank on the compressor assembly itself Sorry to take so long to get back with you. I have not been able to nail down the....
-
Ian I got some hedges from the local motor repair place and also they gave me a large flat sheet of the stuff before I left. After having to re-bend a ....
-
-
When low/high input is voltage in binary form, as obtained from converter circuit (also given in artide) fed by digital voltmeter, circuit produces Iow pitch for binary 0 and high pitch for binary 1 when S2 is set at D for digital voltmeter mode. Recognition....
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The circuit shown flashes the LED briefly (to get your attention) and stays on as long as the power is on ( Fig. 1 ). The venerable 555 timer IC can be put to use in this type of application. The circuit is a standard astable multivibrator with resistors RA,....
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This is the 40Mhz RF amplifier circuit. The sensitivity of a receiver may be significantly increased if this circuit is inserted between the receiver and the antenna. The amplifier circuit does not use resonant circuits and is suitable for both medium and....
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This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily (see....
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This text regards MSC1210 as the cores of measuring, SIGPROC signal processing and communication, has designed the module of acquisition system of high-accuracy temperature. It is easy to expand that this system measures the passway, survey accuracy is high,....
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When the switch is opened, the timer produces an approximate 1 second clock signal, decrementing the counter until the 0 count is reached. When the zero count is reached, the `carry out` signal at pin 7 of the counter moves low, energizing the 12 volt relay....
Remote control circuit consists of two parts, one is the transmitter and the other is the receiver. A simple schematic diagram of the remote control. IC transmitter transmitter circuit is controlled by NE555. Receiver circuit works by the frequency of the....![become a VU meter and homemade rhythm lights easy [megapost]](uploads/25/LM3916schematics.jpg "become a VU meter and homemade rhythm lights easy [megapost]")
Post related to Do it yourself about become a VU meter and homemade rhythm lights easy....
In many cases, the dimmer presented here may be built into a wall-mounted box containing the light switch. It is intended for use with 240 V incandescent lamps only. When it is fitted, and the light is switched on, the lamp does not come on fully for about....
This is an implementation of the L298 to drive motors and inductive loads up to 4A continuously. Initially the L298 contains two separate channels, each one capable of driving 2A loads. Connecting them in parallel as in the schematic makes a single 4A....
This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings....
This circuit shows about Ne7555 Timer For Light Sensitive Alarm Sensor Circuit Diagram. Features: detects a sudden shadow falling on the ....
Accessories built so far include a linear power supply, a switchmode power supply, a tuning aid, and a headset. An antenna tuner and SWR meter will be described later. In order to operate the new transceiver, I needed a power supply. I began by building a....
Afroman covers the basics of how transformers work, where to shop for step down mains transformers, and how to wire one up to mains voltages without killing yourself. European and North American wiring is discussed. He finishes up with a quick example of AC....
Circuit Fear not, dear reader - I haven`t given up the sauce. I am not in withdrawal, suffering severe autonomic instability. I refer not to Delirium Tremens, but to time differences, dt. Specifically to the "DT" data column in the WSPR GUI. Everything was....
This is a nice LFO for all of your modulation needs. The frequency can be voltage controlled to add a new dimension to your sound palette. The pulse width of the rectangle wave can be varied between approximately 10% and 90% again lending variability to the....
This is a fun and non-dangeros project for those people who like to throw projectiles magnetically. It simply works by placing a ferromagnetic projectile at one end of a coil and pulsing some power in it. The trick is to switch off power when the projectile....
A Direct-Coupled 6V6 Tube Amplifier with Cathode Follower by Raymond H. Bates from Radio & Television News magazine November 1949..
This optodetector measures the position of the ball by the amount of light transmitted by the infrared LED. This is a linear signal across the small area of the detector - it is not just "on" and "off". This circuit creates a control signal from the two....
This is a simple preamplifier circuit for electret condenser microphone. using a LM1458 dual op amp IC. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn`t....
that used a SRPP (shunt-regulated PP) driver stage I started to do some research and modeling on a SRPP. The advantages of such a line stage are much the same as those when a SRPP is used as a driver. Good linearity, low distortion, low impedance output,....
Used to delay beginning of crt sweep for expanded display. Provides three ranges: 0 to 5, 60, and 200 miles. Circuit is basically cathode-coupled phantastron, with additional coupling by returning suppressor and screen to same divider. Cathode follower....
The USB standard restricts the current consumption of all USB devices to either 100mA or 500mA depending on the specifics of the USB hub and/or host controller (i. e. computer) that is supplying the power. Ideally, no USB device should ever pull more than....
The FM radio receiver with PLL designed by A. Zaharov [1] still attracts the attention of radio amateurs. As noted in a publication of the magazine "Radio" [2, 3], one of the major drawbacks of this type of detectors is the low adjacent channel selectivity.....
This is a simple servo tester which will comprehensively test the capabilities of almost any modern servo. It has two pushbuttons, CENTRE and SWEEP and a potentiometer which works as follows:..
The analog input is first fed into a fast non-inverting buffer amplifier (OPA353) set up for unity gain which protects the analog-to-digital converter from out-of-range voltages. The ADS830 is a fairly cheap 8-bit analog-to-digital converter which supports....
This is a schematic diagram of a pulse width to analog demodulator circuit. This circuit is used to demodulate the pulse width to analog voltage level. With...
The dc path is from the negative side (ground) of VCC through RE, Q1, T1, and back to the positive side of VCC. The figure clearly illustrates that both the ac and dc components flow through the tank circuit...
This circuit is a circuit diagram is included in the RF circuit. FM Transmitter circuit diagram using the IC BH1417. Where the integrated circuit design from RHOM which includes many features in one small package. He came with pre-emphasis, limiter so that....
In this article, I`ll show you how to create a simple yet effective way of scaring off intruders. Of course, there are methods around this approach, but it`s great for office pranks and general fun. The project requires a little background knowledge in....
The circuit in the diagram was originally designed to monitor an oscillator, but can also be used as a general-purpose level indicator for a. c. signals. It is based on a quadruple IC containing four NAND gates. Only three of the gates are used, making the....
This type of voltmeter is very common because of its low cost. This instrument can be used only to measure voltages of the order of milli-volts owing to limited amplifier gain. The circuit diagram for a direct coupled am plifier dc voltmeter using cascaded....
I hate to suggest the specific application `bicycle` because it may be use to protect many items from theft. This anti-theft alarm project is built around....
This experiment may be built using only one 8-position DIP switch, but the concept is easier to understand if two switch assemblies are used. The idea is, one switch acts to hold the correct code for unlocking the lock, while the other switch serves as a....
Output transformer core: coming from flea market, light blue color, marked as A-438281-2-9H9-3, OD = 47 mm, ID = 24 mm, height = 13 mm. No information about µ Mosfet to be used: coming from flea market, with the following characteristics. It`s an obsolete....
A very simple direct conversion receiver based on the NE602 Gilbert Cell mixer and a LM386 audio amplifier. The circuit is based onthe famoussudden receiver design from the Rev George Dobbs G3RJV many years ago and looks something like this: My....
30W Class AB power amplifier circuit diagram using power transistor. Set the above amplifier up by adjust the variable resistor R1 to maximum and R12 to zero. After this set up is done, the activate / turn on the amplifier. Adjust the R1 so that the measured....
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-....
This device is designed to measure the torque in an automobile drive shaft and provide an output to a vehicle data recording system or a portable computer via an RS-232 interface. The received data can then be combined with RPM measurements from the data....
The schematic for this project flows naturally from left to right. Beginning at the antenna and the regenerative receiver front-end, then flowing through the amplification stages and then into the 555 timer. This is a very common regenerative receiver....
The LC72146 is a PLL Frequency Synthesizer LSI circuit for electronic tuning in car stereo systems. The LC72146 supports the construction of high-performance, multi- functional electronic tuning systems for the VHF MW, and LW bands. By Sanyo Semiconductor....
Below is the schematic diagram of an audio input module. We can produce a DC output voltage that is proportional to the input signal amplitude (the signal....
The circuit below illustrates how to build your own daq_lite - also shown is a photo of a completed PCB board. Note that the 80mA fuse shown in the photo and the protection diode close to it are recommended but not necessary. Once you`ve built the circuit....
Controlling the speed of three phase ac motor is done by controlling the frequency of the power line supply, since the motor is synchronized with the line frequency. Three phase ac motor speed controller is actually nothing more than three phase sine wave....
a single-line diagram of the ship`s service generator and switchboard connections for a destroyer. Component: Resistor, Capacitor, Transistor, ....
The SC9256 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers. All functions ate controlled through 3 serial bus lines. These LSIs are used to configure high-performance digital tuning system. By Silan ..
This tube tesla coil was built inside a CPU power supply unit. It was first built on a workbench using components and jumpers for connections. The tube used is a 4X150 transmitting tube that used forced air cooling. An old oscilloscope transformer was used....
This simple fm radio receiver circuit consists of a regenerative rf stage, TR1, followed by a two of three-stage audio amplifier, TR2 to TR4. In some areas....
This circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffered and amplified by the IC1 prepared to redistribute. It has 3 outputs to drive 3 audio lines with....
If you haven`t already read my CT-100 restoration article, I suggest that you start there. It chronicles how I found a CT-100 and restored it to working condition. This article discusses what`s under the hood. After noting some hardware highlights, we`ll....
Audio Light Modulator. Audio light modulations add to the enjoyment of music during functions organised at home or outdoors. Presented here is one such simple circuit in which...
Colpitts oscillator can be implemented using op-amp as long as we have an op-amp with proper bandwidth. Here is an example of such circuit: LT1190 or LT1191....
My audio source will be a Line Level Audio -2V to +2V AC passed through a 220uF coupling cap and then a low pass filter(RC, 2 pole). The signal will be read by an ADC another one that i have seen is I don`t quite understand this FET-BJT preamp circuit And....
This is a glove that plays a very competitive game of Rock Paper Scissors against the wearer. It learns how they wearer plays and plays to their weaknesses. Why I`m nottotallysure. Chasing down the source of inspiration is often impossible, but sometimes a....
Here the simple file alarm circuit based timer ID NE555. The works is simple, the lamp give light to the LDR (Light Depending Resistor) as light sensor. When the light from the lamp covered with smoke then the LDR will change its resistance value and then....
The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf....
This page is going to describe the parts, schematic, softw1are, and some tips on using Infrared for object detection. The parts used are typically the same parts found in most consumer electronic remote controls, and are widely available. If you have an old....
In operation, the alarm circuit allows a 0-47 second time delay, as determined by the R1/C1 combination, after the switch is armed to allow the vehicle`s motion sensor to settle down. This allows you time to get a bag of groceries out of the trunk and not....
The circuit turns on a light corresponding to the first of several buttons pressed in a "Who`s First" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps....
Several easy modifications for a Dataq DI-194RS and DI-154RS. There are at least two different styles: the kind that come packaged (shown) and the kind that come as an unpackaged PCB. The unpackaged ones are what you get when you are fortunate enough to get....
This resource contains step to step information to make AVR microcontroller programmer with suitable circuit diagram. This programmer able to program 8051, AT89XX, AT90XXXX, 8031 family microcontrollers....
A method of determining altitude is by the use of barometric pressure; however, it is not done without difficulty. The relationship of pressure vs. altitude is not a linear one, it is actually a fairly complex one, which the army came up with in the 1930`s.....
Here is a project Device switching using password by innovative group Dreamlover technology, lets the user to lock their device with password. The block diagram of device switching using password is shown in figure 1. As the circuit device switching using....
This is a simple JFET input buffer that goes into a clean boost based on the old Electro-Harmonix LPB-1 Linear Power Boost. The guitar input is buffered and then split off to four input points. These input points can then go on to various other modules in....
Detection systems are a key component of any imaging system, and an understanding of their properties is important for establishing appropriate operating criteria or designing schemes for obtaining quantitative information. In this section scintillation....
Here is a simple IR headphone circuit that is suitable for listening to TV or radio with out disturbing others. For beginners the IR headset is a better option than FM head sets because they often produce desirable sound quality with out tuning as well as....
This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although....
Wrap hundreds of turns of magnet wire around the paper tube. Connect this home-made inductor in series with an AC power supply and lamp to form a circuit. When the tube is empty, the lamp should glow brightly. When the steel bar is inserted in the tube, the....
Has high input impedance und low output impedance, to reduce droop in output voltage between pulses. Staircase is generated by pump D2-C2, which is boostrapped on output to maintain equal amplitude on each step. Circuit values shown give 10 steps with 12-V....
This circuit uses a digital pot to allow the microcontoller to automatically adjust the gain of the circuit to suit the ambient audio volume, but you could replace this with a standard pot if this isn`t needed. The low pass filter is a copy of Graham....
This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It`s a fairly powerful SE amp that works very well. It uses a single pentode as the driver (a 12HG7 video amp tube), and a solid-state power supply with....
A solar cell radio used a 3V (or two 1.2V) Ni-Cad battery in it. The battery can not be removed. It use a mini jack socket for charging. Its quiet difficult...
Typically the input protection fuse of your DMM will blow in the middle of a demonstration or an exciting phase of your construction work. Spare fuses are always hard to find, and if available take a lot of time to install. This circuit replaces the fuse by....
Need to know where is the phisical location of the compressor relay. Also do you know how to test the pressure sensor on the plastic tank on the compressor assembly itself Sorry to take so long to get back with you. I have not been able to nail down the....
Ian I got some hedges from the local motor repair place and also they gave me a large flat sheet of the stuff before I left. After having to re-bend a ....
When low/high input is voltage in binary form, as obtained from converter circuit (also given in artide) fed by digital voltmeter, circuit produces Iow pitch for binary 0 and high pitch for binary 1 when S2 is set at D for digital voltmeter mode. Recognition....
The circuit shown flashes the LED briefly (to get your attention) and stays on as long as the power is on ( Fig. 1 ). The venerable 555 timer IC can be put to use in this type of application. The circuit is a standard astable multivibrator with resistors RA,....
This is the 40Mhz RF amplifier circuit. The sensitivity of a receiver may be significantly increased if this circuit is inserted between the receiver and the antenna. The amplifier circuit does not use resonant circuits and is suitable for both medium and....
This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily (see....
This text regards MSC1210 as the cores of measuring, SIGPROC signal processing and communication, has designed the module of acquisition system of high-accuracy temperature. It is easy to expand that this system measures the passway, survey accuracy is high,....
When the switch is opened, the timer produces an approximate 1 second clock signal, decrementing the counter until the 0 count is reached. When the zero count is reached, the `carry out` signal at pin 7 of the counter moves low, energizing the 12 volt relay....
