New Circuits Page 57
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The GM Counter Accessory is shown below. It can generate a DC voltage upto 1 KV using the 5V pulse generated on PWG. The duty cycle of the pulse is varied to control the voltage. The high voltage applied to the GM tube is divided by 200 and connected to CH0....
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Here we demonstrate the use of an Arduino PWM output pin to generate sound. The output pin can be toggled very quickly from LOW to HIGH generating a square wave. If the frequency of this square wave is within the range of 20-20, 00Hz and sent directly into a....
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The applied microcontroller is an ATMega8 clocked at 16MHz. This microcontoller can shift out arbitrary wavefroms from its flash or SRAM storage at a rate of 2MS/s (and even faster!). The 8bit data is fed from portD to the AD converter ( Analog `s AD7524)....
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This circuit will generate siren sound when S1 pressed and increate sound frequency becuase capacitor C1 charged when switch S1 released the frequency will decreated(C1 discharged)...
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The Tupperware Turret circuit is as simple as things can get whilst still maintaining full functionality. The main parts seen in the schematic below are the: 18F4520, Servo Motors, IR Receiver and TIP120. The batteries used for this project are 4 standard AA....
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This circuit is very similar to Repeating Timer No. 2. However - the addition of the light dependent resistor means that the operation of this timer can be limited to the daylight hours. R7 lets you set the level of light at which the timer will stop. The....
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Many commercial pest repellers operate in the range of 30 to 50 kHz. My aim was, however, to design a slightly different and somewhat more powerful audio frequency/ultrasonic sound generator that could be used to train dogs. Just imagine the possibilities -....
-
The line-in pin is clearly visible in the pinout of iPod connector shown on the iPod wiki. From then they came a long way through making their first hand soldered mic to now selling neat small mics on their site. They have got their own SIP VoIP servers....
-
The receiver is a tripple superheterodyne receiver with two PLL-guided local oscillators. The first LO (2. 1 GHz) can be set in steps of 500kHz and sets the RX signal down to 188 - 188. 5 MHz. It has a high PLL loop bandwidth of around 20kHz, therefore gives....
-
The Intan Technologies RHA2116 16-channel integrated amplifier array requires only three external resistors (to set amplifier bandwidth), two capacitors (to smooth power supply), and one square centimeter of board area. Intan Technologies digital-output and....
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The circuit in the schematic below is an infrared transmitter. The infrared beam is transmitted in a nearly line-of-sight pattern to another device with an infrared receiver. The plotted waveforms are the output voltages of the two intermediate stages....
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This is a stereo amplifier circuit diagram. The amplifier will produce stereo output channel with the power audio output can reach up to 70W for each channel. The amplifier built based great amplifier chip STA550 from STMicroelectronics. Take a note that....
-
This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An....
-
A beautiful diy gsm jammer or mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobi....
-
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....
-
The positive feedback comparator circuit increases the gain ofthe op-amp, which helps to switch very fast between the two states of a multivibrator. The positive feedback also provides hysteresis to the circuit. A capacitor `C` is connected to the inverting....
-
This circuit was intended to be used as a separate, portable unit, to signal by means of a LED when the output wave form of a particular audio stage is "clipping" i. e. is reaching the onset of its maximum permitted peak-to-peak voltage value before an....
-
The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal batts (i. e. Duralites). Power source can be a 12v Gell....
-
-
The TDA7088T can be used in mono portable and pocket radios. This is a bipolar integrated circuit. Here`s one of the application circuit diagram: When a...
-
This RF-circuit is operating at 7. 68MHz and 48V phantom power supplied. It is tested with a large diaphragm cardioid capsule from Ralf Falk, who himself is designing a LF tube microphone and with a small diaphragm capsule from a Sennheiser MKH415. (Do not....
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Freescale Semiconductor has unveiled at the Freescale Technology Forum in Tokyo what it says is the industry`s first tire pressure monitoring system (TPMS) containing a capacitive pressure sensor for ultra-low-power consumption and precise sensing. "By using....
-
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As with any audio mixer circuit, a slight loss is always introduced. The final summing amplifier has a gain of 2 or 6dB to overcome this. The Input line level should be around 200mV RMS. The mic inputs are amplified about 100 times or 40dB, the total gain of....
-
I needed a couple of AA batteries and found the display at the supermarket where they were all arrayed. Normally when I`m shopping in the supermarket, I tend to look at the price/kg or price/l when comparing similar products. In the case of the batteries,....
-
Do you know our 8051 microcontroller can play music tones, here s an sample. The circuit & code given here will play the music for “wishes you to be ....
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This circuit was designed in response to a request from my reader. What he asked for was a 1KHz IR transmitter circuit for some remote control application. I think this circuit may satisfy him. Any way this circuit can be used where ever a low power IR....
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-
As power supply switching frequencies increase, higher loop crossover frequencies are necessary to keep pace with the escalating load transient slew rate demands, and to reduce the number and size of filter components. For voltage-mode-controlled supplies,....
-
Martin KH6MB designed an antenna tuner for use with end-fed half-wave vertical antennas for use during annual feld day events. The tuner is capable of handling bands from 10-40 meters at legal limit power. The rotor shaft of the capacitor is attached to the....
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This package contains the schematic for an FM transmitter with 3 to 3.5 W output power, and can be used between 90 and 110 Mhz. Although the stability Although the stability isn't so bad, a PLL can be used on this circuit. This is a circuit that I've build....
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This sawtooth generator circuit use 741 IC and is used as a musical sound synthesizer. The sawtooth input signal is continously changed through P2 to a wav....
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Regardless of whether you want to effectively imitate a house fire, a campfire, or light from welding, the circuit described here fills the bill without using a microcontroller, although it does use a larger number of components (including some truly....
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Here`s some schematics and information that can be hard to find elsewhere. If you have some schematics that you think belongs among these, please do not hesitate to contact me. I hope to be able to extend this little collection with time, so check back for....
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Want to make some stuff that fits your car or motor cycle Then here is a simple musical horn circuit that can be connected to the 12V battery of any car or motorcycle. This circuit commonly used as reverse musical horn. Here we use a commercially very low....
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The Universal Serial Bus (USB) interface has become extremely popular, due to its simplicity for end user applications (Plug and Play without restart). For developers, however, USB implementation into end systems has been more complicated compared to e. g.....
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This manual is applicable to all integral horsepower DC motor controls of this series from 40 HPto 300 HP. The integrated circuit regulator selection of these DC motor controls are modular inconstruction, affording a minimum of down time in the event of a....
-
This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can deliver up to 45W on 8 ohm. This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the....
-
Building VFOs in 2011 might seem an irrelevant exercise given the move to and evolution of digital signal generators laden with bells and whistles like memories and audio or video frequency displays. A successful L-C VFO requires skill, patience and some....
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Photo-diode can be used for high speed digital transmission, but you have to provide high speed signal conditioner for that purpose. The amplifier circuit....
-
All electronic systems and equipment regardless of their size or function have one thing in common: they all need a power supply unit (PSU) that converts input voltage into a voltage or voltages suitable for their circuits. The most common type of today`s....
-
This article presents practical techniques for incorporating "correctness by design" in DDR2 interfaces, from a Signal Integrity (SI) perspective, using the current generation of available design tools. Some common DDR2 design errors are analyzed, as well as....
-
Complete wireless product development by LS research. Specializing in RF Design, WiFi modules, Antenna Design, Zigbee, Bluetooth and more....
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The following document will provide information to develop your own VACI (Vehicle Accessory Computer Interface). What I have done is rather simple, however it took about 3 weeks of planning, programming and debugging. The wow factor on this interface is....
-
Designing a circuit that will use a combination of switches and resistors to allow a microcontroller to identify which switch was pressed based on the voltage read and perform a switch-specific action. The design that I`ve come up with involves using a....
-
The circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. This can be used as part of fire smoke detectors but do....
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The circuit is based around the 7805 voltage regulator. It has only 3 connections (input, output and ground) and it provides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12, 15, 18, or 24. The 7800....
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Here is a circuit for simulating breathing / pulsing LED with the 555 timer chip. It became very popular and i received many comments and emails with people that made this circuit and worked fine, as well as comments with people that had troubles converting....
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This stage adds the TX Mixer to the board and provides the modulation of the Dividers` output signals by the 4 I and Q signals from the TX OpAmps (Quadrature Sampling Exciter - QSE). The result is a double sideband RF waveform that will be coupled into the....
-
This is a low cost circuit that adds precise current limit functionality to a voltage regulator...
-
The whole project was developed on a friend`s request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. Mains requirements were: The very....
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This is implemented as a windows service that detects any power event (Suspend, Hibernate, Reboot, Shutdown) and can send a proper response to the control circuit (Heartbeat or Kill). The trigger is also controlled via Ignition Power so that the amp will....
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The following circuit shows about (Sun Up Alarm) Light Alarm Circuit Diagram. This circuit based on the 555 IC Features: Simple circuit, cheap ....
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-
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The fundamental operation of an RF front end is fairly straightforward: it detects and processes radio waves that have been transmitted with a specific known frequency or range of frequencies and known modulation format. The modulation carries the....
-
Alright, so I had some post-publication weirdness following my last post, and it took me a few days to figure out exactly what was up, but I think I finally have all the details, and I learned a lot in the process. I noticed some weirdness towards the end of....
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The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project. A compact 9-volt PP3 battery can be used with the transmitter.....
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-
Many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work How can I implement it myself Probably you already have it, and just didn`t know it.....
-
This is Easy and Mini Timer Circuit ( Egg Timer) by IC 555. Alarm by Buzzer. This be mini timer circuit that interesting. I calls that Circuit Egg Timer. By...
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This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission....
-
Above ” 2 air variable capacitors and a copper clad board screwed onto a piece of wood for my bench musing. Regenerative receivers delight and amaze ” some builders take them very seriously. I respect this, but to me; they should be as simple as possible. I....
-
Made of SS0001 human pyroelectric voice alarm circuit diagram as shown: Pyroelectric infrared language warning device described in this article can be used to prevent electric shock or theft, after a little modification can also be used for automatic light....
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Hi, I would like to use this relay: PE014A12 (tyco electronics) It has only 1 coil and it has to be driven + / - to switch on and - / + to switch off, ....
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Real time clock turns OFF the counter at night for reduced power. When the bee crosses under the LED the light is reflected back to the sensor. (its a photo transistor) and triggers a digital input to the Arduino. (or teensy in my case). I lined up two chips....
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The circuit uses ACpositive half cycle charge. Charging speed is fast and it can extend battery life. People use the charger on ordinary motorcycle. It has an excellent performance and saves 5% fuel. It is a practical charging circuit. Working principle:....
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This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
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A stepper motor is a motor controlled by a series of electromagnetic coils. The center shaft has a series of magnets mounted on it, and the coils surrounding the shaft are alternately given current or not, creating magnetic fields which repulse or attract....
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I managed to break my laptop, by reversing the polarity of a universal power supply. The repair shop diagnosed the problem as a failed motherboard, and asked for ‚¬659 to replace it. I found the price preposterous and the notion of throwing away a....
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While they have been with us for many years, fluorescent lamps remain somewhat mysterious to most people. This isn`t really surprising, since their operation isn`t simple. The tube itself contains a mixture of gases, but the active ingredient is mercury.....
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A oscilloscope would be useful in analyzing the waveforms produced by this circuit, but it is not essential. An audio detector is a very useful piece of test equipment for this experiment, especially if you don`t have an oscilloscope. The "555" integrated....
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Here is a simple circuit that will produce a musical horn when ever your car is in reverse gear. The circuit uses two ICs for the operation, voltage regulator 7805(IC1) and musical tone generator UM66(IC2). The IC1 reduces the car battery voltage to 5V. The....
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The schematic diagram shows an audio stage with a common-collector circuit. This does not damp the tuned circuit, but instead actually increases its response. This yields good sensitivity and selectivity. Due to the low supply voltage, the subsequent audio....
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This circuit could be used (depending on your circumstances) by a gentleman to summon his butler, a manager his secretary or as in the author`s case to call the kids down to dinner without having to shout above the level of the CD player/TV/games console in....
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If you forget to switch off the light after leaving a seldom used room (such as the loft), there`s a strong likelihood that it could remain lit for months, running up an expensive power bill in the process. How can we prevent this waste It`s not hard for....
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The loop may be fed inside the center of one of the vertical sides if vertical polarization is preferred. For horizontal polarization, it can be necessary to feed either in the horizontal sides in the center. Optimum directivity happens at proper angles....
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Thanks for the diagram Zinc! Loooks very interesting - please keep us informed of any results. I`m MrFlathunter on Youtube and you commented on my 12V ....
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This page describes how I have modified my SkyWatcher dual axis EQ5/EQ4 motor controller to allow autoguiding through the parallel port from a PC. The modification allows the RA+, RA-, Dec+ and Dec- buttons to be activated from the PC via the parallel port....
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A simple NiCd charger can be built using junk box` components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter composed of R3 and a transistor, it can charge as many cells as desired until a fully charged` voltage determined by the....
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Pulse telephone 160 168 controller circuit is shown as above, the controller can be installed on the phone or on the switchboard of the trunk. It can effectively prevent the others to freely dail 160, 168. D1 ~ D4 use 1N4004, the rest diode use 1N4008. Q1,....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate....
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Remote control tester circuit diagram. The tester is designed around infrared receiver module TSOP1738. Operation of the remote control is identified by a tone from the buzzer. The circuit is sensitive and has a range of about 5 metres. The integrated IR....
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The Colpitts circuit, like other LC oscillators, consists of a gain device (such as a bipolar junction transistor, field effect transistor, operational amplifier, or vacuum tube ) with its output connected to its input in a feedback loop containing a....
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First off I should mention that this is supplemental Instructable to the countless others that show you how to build a USB charger. I am assuming you....
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This page describes the hardware and software design of a printer power switch controlled over USB from my Linksys NSLU2, aka Slug. The unit can, however, be controlled from any Linux box, and can switch anything, not just printers. My NSLU2 acts mostly as a....
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Often government data sets available to us online are taken from major nearby metropolitan areas or infrastructural centers. With an easy to follow introduction to new softwares and technologies the urban sensor kit allows anyone to obtain location....
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This presence detector or proximity sensor circuit reacts in presence of any conductor object including humans. Sensitivity is adjustable with P1 which will be located at a great distance from the rest of the presence detector circuit. This circuit does not....
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This is Circuit LM3914 LED VU Meter. use IC1-LM3914 and Transistor BC109C, By circuit will show level of audio signal(power Music) is dB in six level by LED...
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The overall performance of any rf circuit in regards of it`s phase noise and spectral purity depends significantly on the frequency generating circuitry, commonly an oscillator. Low noise oscillators with high spectral purity are neither witchcraft nor black....
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How to build and use simple PIC programmer with very easy to find and extremely low cost parts. Total cost to build programmer is less than 1.5USD....
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A water level controller based using 8051 is shown in this article. A lot of water level controller projects have been published in this website but the is the first one based on a microcontroller. This water level controller monitors the level of the over....
The GM Counter Accessory is shown below. It can generate a DC voltage upto 1 KV using the 5V pulse generated on PWG. The duty cycle of the pulse is varied to control the voltage. The high voltage applied to the GM tube is divided by 200 and connected to CH0....
Here we demonstrate the use of an Arduino PWM output pin to generate sound. The output pin can be toggled very quickly from LOW to HIGH generating a square wave. If the frequency of this square wave is within the range of 20-20, 00Hz and sent directly into a....
The applied microcontroller is an ATMega8 clocked at 16MHz. This microcontoller can shift out arbitrary wavefroms from its flash or SRAM storage at a rate of 2MS/s (and even faster!). The 8bit data is fed from portD to the AD converter ( Analog `s AD7524)....
This circuit will generate siren sound when S1 pressed and increate sound frequency becuase capacitor C1 charged when switch S1 released the frequency will decreated(C1 discharged)...
The Tupperware Turret circuit is as simple as things can get whilst still maintaining full functionality. The main parts seen in the schematic below are the: 18F4520, Servo Motors, IR Receiver and TIP120. The batteries used for this project are 4 standard AA....
This circuit is very similar to Repeating Timer No. 2. However - the addition of the light dependent resistor means that the operation of this timer can be limited to the daylight hours. R7 lets you set the level of light at which the timer will stop. The....
Many commercial pest repellers operate in the range of 30 to 50 kHz. My aim was, however, to design a slightly different and somewhat more powerful audio frequency/ultrasonic sound generator that could be used to train dogs. Just imagine the possibilities -....
The line-in pin is clearly visible in the pinout of iPod connector shown on the iPod wiki. From then they came a long way through making their first hand soldered mic to now selling neat small mics on their site. They have got their own SIP VoIP servers....
The receiver is a tripple superheterodyne receiver with two PLL-guided local oscillators. The first LO (2. 1 GHz) can be set in steps of 500kHz and sets the RX signal down to 188 - 188. 5 MHz. It has a high PLL loop bandwidth of around 20kHz, therefore gives....
The Intan Technologies RHA2116 16-channel integrated amplifier array requires only three external resistors (to set amplifier bandwidth), two capacitors (to smooth power supply), and one square centimeter of board area. Intan Technologies digital-output and....
The circuit in the schematic below is an infrared transmitter. The infrared beam is transmitted in a nearly line-of-sight pattern to another device with an infrared receiver. The plotted waveforms are the output voltages of the two intermediate stages....
This is a stereo amplifier circuit diagram. The amplifier will produce stereo output channel with the power audio output can reach up to 70W for each channel. The amplifier built based great amplifier chip STA550 from STMicroelectronics. Take a note that....
This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An....
A beautiful diy gsm jammer or mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobi....
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....
The positive feedback comparator circuit increases the gain ofthe op-amp, which helps to switch very fast between the two states of a multivibrator. The positive feedback also provides hysteresis to the circuit. A capacitor `C` is connected to the inverting....
This circuit was intended to be used as a separate, portable unit, to signal by means of a LED when the output wave form of a particular audio stage is "clipping" i. e. is reaching the onset of its maximum permitted peak-to-peak voltage value before an....
The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal batts (i. e. Duralites). Power source can be a 12v Gell....
The TDA7088T can be used in mono portable and pocket radios. This is a bipolar integrated circuit. Here`s one of the application circuit diagram: When a...
This RF-circuit is operating at 7. 68MHz and 48V phantom power supplied. It is tested with a large diaphragm cardioid capsule from Ralf Falk, who himself is designing a LF tube microphone and with a small diaphragm capsule from a Sennheiser MKH415. (Do not....
Freescale Semiconductor has unveiled at the Freescale Technology Forum in Tokyo what it says is the industry`s first tire pressure monitoring system (TPMS) containing a capacitive pressure sensor for ultra-low-power consumption and precise sensing. "By using....
As with any audio mixer circuit, a slight loss is always introduced. The final summing amplifier has a gain of 2 or 6dB to overcome this. The Input line level should be around 200mV RMS. The mic inputs are amplified about 100 times or 40dB, the total gain of....
I needed a couple of AA batteries and found the display at the supermarket where they were all arrayed. Normally when I`m shopping in the supermarket, I tend to look at the price/kg or price/l when comparing similar products. In the case of the batteries,....
Do you know our 8051 microcontroller can play music tones, here s an sample. The circuit & code given here will play the music for “wishes you to be ....
This circuit was designed in response to a request from my reader. What he asked for was a 1KHz IR transmitter circuit for some remote control application. I think this circuit may satisfy him. Any way this circuit can be used where ever a low power IR....
As power supply switching frequencies increase, higher loop crossover frequencies are necessary to keep pace with the escalating load transient slew rate demands, and to reduce the number and size of filter components. For voltage-mode-controlled supplies,....
Martin KH6MB designed an antenna tuner for use with end-fed half-wave vertical antennas for use during annual feld day events. The tuner is capable of handling bands from 10-40 meters at legal limit power. The rotor shaft of the capacitor is attached to the....
This sawtooth generator circuit use 741 IC and is used as a musical sound synthesizer. The sawtooth input signal is continously changed through P2 to a wav....
Regardless of whether you want to effectively imitate a house fire, a campfire, or light from welding, the circuit described here fills the bill without using a microcontroller, although it does use a larger number of components (including some truly....
Here`s some schematics and information that can be hard to find elsewhere. If you have some schematics that you think belongs among these, please do not hesitate to contact me. I hope to be able to extend this little collection with time, so check back for....
Want to make some stuff that fits your car or motor cycle Then here is a simple musical horn circuit that can be connected to the 12V battery of any car or motorcycle. This circuit commonly used as reverse musical horn. Here we use a commercially very low....
The Universal Serial Bus (USB) interface has become extremely popular, due to its simplicity for end user applications (Plug and Play without restart). For developers, however, USB implementation into end systems has been more complicated compared to e. g.....
This manual is applicable to all integral horsepower DC motor controls of this series from 40 HPto 300 HP. The integrated circuit regulator selection of these DC motor controls are modular inconstruction, affording a minimum of down time in the event of a....
This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can deliver up to 45W on 8 ohm. This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the....
Building VFOs in 2011 might seem an irrelevant exercise given the move to and evolution of digital signal generators laden with bells and whistles like memories and audio or video frequency displays. A successful L-C VFO requires skill, patience and some....
Photo-diode can be used for high speed digital transmission, but you have to provide high speed signal conditioner for that purpose. The amplifier circuit....
All electronic systems and equipment regardless of their size or function have one thing in common: they all need a power supply unit (PSU) that converts input voltage into a voltage or voltages suitable for their circuits. The most common type of today`s....
This article presents practical techniques for incorporating "correctness by design" in DDR2 interfaces, from a Signal Integrity (SI) perspective, using the current generation of available design tools. Some common DDR2 design errors are analyzed, as well as....
Complete wireless product development by LS research. Specializing in RF Design, WiFi modules, Antenna Design, Zigbee, Bluetooth and more....
The following document will provide information to develop your own VACI (Vehicle Accessory Computer Interface). What I have done is rather simple, however it took about 3 weeks of planning, programming and debugging. The wow factor on this interface is....
Designing a circuit that will use a combination of switches and resistors to allow a microcontroller to identify which switch was pressed based on the voltage read and perform a switch-specific action. The design that I`ve come up with involves using a....
The circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. This can be used as part of fire smoke detectors but do....
The circuit is based around the 7805 voltage regulator. It has only 3 connections (input, output and ground) and it provides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12, 15, 18, or 24. The 7800....
Here is a circuit for simulating breathing / pulsing LED with the 555 timer chip. It became very popular and i received many comments and emails with people that made this circuit and worked fine, as well as comments with people that had troubles converting....
This stage adds the TX Mixer to the board and provides the modulation of the Dividers` output signals by the 4 I and Q signals from the TX OpAmps (Quadrature Sampling Exciter - QSE). The result is a double sideband RF waveform that will be coupled into the....
This is a low cost circuit that adds precise current limit functionality to a voltage regulator...
The whole project was developed on a friend`s request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. Mains requirements were: The very....
This is implemented as a windows service that detects any power event (Suspend, Hibernate, Reboot, Shutdown) and can send a proper response to the control circuit (Heartbeat or Kill). The trigger is also controlled via Ignition Power so that the amp will....
The following circuit shows about (Sun Up Alarm) Light Alarm Circuit Diagram. This circuit based on the 555 IC Features: Simple circuit, cheap ....
The fundamental operation of an RF front end is fairly straightforward: it detects and processes radio waves that have been transmitted with a specific known frequency or range of frequencies and known modulation format. The modulation carries the....
Alright, so I had some post-publication weirdness following my last post, and it took me a few days to figure out exactly what was up, but I think I finally have all the details, and I learned a lot in the process. I noticed some weirdness towards the end of....
The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project. A compact 9-volt PP3 battery can be used with the transmitter.....
Many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work How can I implement it myself Probably you already have it, and just didn`t know it.....
This is Easy and Mini Timer Circuit ( Egg Timer) by IC 555. Alarm by Buzzer. This be mini timer circuit that interesting. I calls that Circuit Egg Timer. By...
This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission....
Above ” 2 air variable capacitors and a copper clad board screwed onto a piece of wood for my bench musing. Regenerative receivers delight and amaze ” some builders take them very seriously. I respect this, but to me; they should be as simple as possible. I....
Made of SS0001 human pyroelectric voice alarm circuit diagram as shown: Pyroelectric infrared language warning device described in this article can be used to prevent electric shock or theft, after a little modification can also be used for automatic light....
Hi, I would like to use this relay: PE014A12 (tyco electronics) It has only 1 coil and it has to be driven + / - to switch on and - / + to switch off, ....
Real time clock turns OFF the counter at night for reduced power. When the bee crosses under the LED the light is reflected back to the sensor. (its a photo transistor) and triggers a digital input to the Arduino. (or teensy in my case). I lined up two chips....
The circuit uses ACpositive half cycle charge. Charging speed is fast and it can extend battery life. People use the charger on ordinary motorcycle. It has an excellent performance and saves 5% fuel. It is a practical charging circuit. Working principle:....
This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
A stepper motor is a motor controlled by a series of electromagnetic coils. The center shaft has a series of magnets mounted on it, and the coils surrounding the shaft are alternately given current or not, creating magnetic fields which repulse or attract....
I managed to break my laptop, by reversing the polarity of a universal power supply. The repair shop diagnosed the problem as a failed motherboard, and asked for ‚¬659 to replace it. I found the price preposterous and the notion of throwing away a....
While they have been with us for many years, fluorescent lamps remain somewhat mysterious to most people. This isn`t really surprising, since their operation isn`t simple. The tube itself contains a mixture of gases, but the active ingredient is mercury.....
A oscilloscope would be useful in analyzing the waveforms produced by this circuit, but it is not essential. An audio detector is a very useful piece of test equipment for this experiment, especially if you don`t have an oscilloscope. The "555" integrated....
Here is a simple circuit that will produce a musical horn when ever your car is in reverse gear. The circuit uses two ICs for the operation, voltage regulator 7805(IC1) and musical tone generator UM66(IC2). The IC1 reduces the car battery voltage to 5V. The....
The schematic diagram shows an audio stage with a common-collector circuit. This does not damp the tuned circuit, but instead actually increases its response. This yields good sensitivity and selectivity. Due to the low supply voltage, the subsequent audio....
This circuit could be used (depending on your circumstances) by a gentleman to summon his butler, a manager his secretary or as in the author`s case to call the kids down to dinner without having to shout above the level of the CD player/TV/games console in....
If you forget to switch off the light after leaving a seldom used room (such as the loft), there`s a strong likelihood that it could remain lit for months, running up an expensive power bill in the process. How can we prevent this waste It`s not hard for....
The loop may be fed inside the center of one of the vertical sides if vertical polarization is preferred. For horizontal polarization, it can be necessary to feed either in the horizontal sides in the center. Optimum directivity happens at proper angles....
Thanks for the diagram Zinc! Loooks very interesting - please keep us informed of any results. I`m MrFlathunter on Youtube and you commented on my 12V ....
This page describes how I have modified my SkyWatcher dual axis EQ5/EQ4 motor controller to allow autoguiding through the parallel port from a PC. The modification allows the RA+, RA-, Dec+ and Dec- buttons to be activated from the PC via the parallel port....
A simple NiCd charger can be built using junk box` components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter composed of R3 and a transistor, it can charge as many cells as desired until a fully charged` voltage determined by the....
Pulse telephone 160 168 controller circuit is shown as above, the controller can be installed on the phone or on the switchboard of the trunk. It can effectively prevent the others to freely dail 160, 168. D1 ~ D4 use 1N4004, the rest diode use 1N4008. Q1,....
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate....
Remote control tester circuit diagram. The tester is designed around infrared receiver module TSOP1738. Operation of the remote control is identified by a tone from the buzzer. The circuit is sensitive and has a range of about 5 metres. The integrated IR....
The Colpitts circuit, like other LC oscillators, consists of a gain device (such as a bipolar junction transistor, field effect transistor, operational amplifier, or vacuum tube ) with its output connected to its input in a feedback loop containing a....
First off I should mention that this is supplemental Instructable to the countless others that show you how to build a USB charger. I am assuming you....
This page describes the hardware and software design of a printer power switch controlled over USB from my Linksys NSLU2, aka Slug. The unit can, however, be controlled from any Linux box, and can switch anything, not just printers. My NSLU2 acts mostly as a....
Often government data sets available to us online are taken from major nearby metropolitan areas or infrastructural centers. With an easy to follow introduction to new softwares and technologies the urban sensor kit allows anyone to obtain location....
This presence detector or proximity sensor circuit reacts in presence of any conductor object including humans. Sensitivity is adjustable with P1 which will be located at a great distance from the rest of the presence detector circuit. This circuit does not....
This is Circuit LM3914 LED VU Meter. use IC1-LM3914 and Transistor BC109C, By circuit will show level of audio signal(power Music) is dB in six level by LED...
The overall performance of any rf circuit in regards of it`s phase noise and spectral purity depends significantly on the frequency generating circuitry, commonly an oscillator. Low noise oscillators with high spectral purity are neither witchcraft nor black....
How to build and use simple PIC programmer with very easy to find and extremely low cost parts. Total cost to build programmer is less than 1.5USD....
A water level controller based using 8051 is shown in this article. A lot of water level controller projects have been published in this website but the is the first one based on a microcontroller. This water level controller monitors the level of the over....
