Top Circuits Page 250
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Of particular interest to us are 12 Volt DC powered PIR sensors and associated circuits since these can be powered directly from a 12 Volt battery which is in turn charged by wind, solar, or other renewable energy sources. In this article we will look at the....
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-
A solar water heating pump controller is a key component in most solar water heating systems (DIY or otherwise). The controller is there to turn the pump on when the fluid in the solar panel is hotter than the water in the hot water tank (or swimming pool),....
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A solar charger for an iPod is no more difficult than making our Solar battery charger. Built in iPod batteries are 3. 7 Volts with the capacity (measured in mAh) dependent on the type of iPod - e. g. 1, 200mAh for a 2nd Gen, 850mAh for a 3rd Gen, 500mAh for....
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This invention is a back EMF permanent electromagnetic motor generator and method using a regauging process for capturing available electromagnetic energy in the system. The device is comprised of a rotor with magnets of the same polarity; a timing wheel in....
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-
-
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-
All you need to do is substitute transistors for the tubes used in these fundamental oscillator circuits to bring this article`s content up to date. Or, maybe you are the owner of a vintage vacuum tube radio and would like to learn a little about how things....
-
Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still legal for today`s Amateur radio operator. Portions of the 40-meter and 80-meter bands are still reserved exclusively for CW operation. As of 2011 in the....
-
RF Cafe visitor Jim L. requested that I post this Build Your Own Vibrato article from the December 1957 edition of Popular Electronics. "Make like Elvis with an `electronic` throbbing guitar, " is the pitch line. Vibrato, for the non-musically inclined, is....
-
The fundamentals of crystals has not changed since this article appeared in a 1960 edition of Popular Electronics. The way they are grown, cut, and packaged has changed fairly significantly. An understanding of how they work at the atomic level has advanced....
-
In October of 1958 when this article was written, a mere year had passed since the successful launch of Sputnik and a few months later the launch of Echo satellites - the first ever for Russia and the USA, respectively. Prior to that time all satellites were....
-
RF Cafe visitor David M. wrote to ask that I scan and post this article from the January 1963 edition of Popular Electronics. It is an article written by Philip Hatfield, of the Receiving Tube Department of General Electric that describe a very simple design....
-
Nixie tubes were used for numeric - and sometimes alpha - displays back in the days before LEDs and LCDs. They were more light bulbs than tubes, but were encapsulated in evacuated glass shells like vacuum tubes and had round, multi-pin bases like tubes.....
-
Prior to the advent of FET-input digital multimeters (DMMs), the vacuum tube voltmeter (VTVM) was the primary instrument for use when high input impedance was required. For the newcomer to electrical measurements, high input impedance for the measuring....
-
Leo Esaki invented the tunnel diode in 1957 while working at Sony (Tokyo Tsushin Kogyo at the time). Tunnel diodes have a very narrow, heavily doped p n junction only around 10nm (100 G…) wide that exhibits a broken bandgap, where conduction band electrons....
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It had been only a little over a decade since the transistor was invented when this article appeared in the August 1959 edition of Popular Electronics. Transistors were still a mystery to most people, including engineers, technicians, and hobbyists. Author....
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In 2011, designing a frequency converter circuit consists in most cases of picking out an IC that has the characteristics you need from a gain and mixer spurious product standpoint, add a couple filters, and a power supply. In many cases the oscillator is....
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-
With a GPS receiver that costs less than a few hundred dollars you can instantly learn your location on the planet-your latitude, longitude, and even altitude-to within a few hundred feet. The output of the VCO is directly connected to a MMIC IC3. This IC....
-
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....
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-
-
This article describes a lighting circuit that generates a glowing firebox effect and provides constant illumination forclassification lamps and an interior cab light. It contains all information needed to build the circuit including a detailed schematic,....
-
Making yourself an alarm is both useful and interesting: but the best part is when you take the remote control out of your pocket, and switch on the alarm while saying to your friends: "I`ve done it in a weekend". Making yourself an alarm gives you maximum....
-
When the system is placed in a shop or mall, logos and product advertisements are a perfect complement to temperature information. For home use, photos of the kids at the beach or should the temperature drop- in the making of Mr. Snowman are a nice gift for....
-
I make a real-size printout of the PCB in order to verify dimensions of all parts against it. Should a part be too big or small to match its PCB pads, I can adjust PCB layout or try to findia compatible part before the hard work starts. Once all parts are....
-
Snap all connectors on to the flat cable (a small vice will do the job). You get an instant male-male, male-female, female-female serial adaptor, plus a short extender cord. A must-have tool if you`re planning to play with serial ports. You can even put an....
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A new generation of intelligent, scriptable sensors/controllers is around the corner. Up to date, the classical approach at the heart of many simple machines consisted of separated thermometer and control units. By contrast, my design is a unified....
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Just 4 integrated circuits and an handful of passive components: the circuit of the Witnesscam is simple. The AVR ATmega32 does an excellent job here. Add the JPG camera module, a PIR sensor and a spare SD-card and you`re done!..
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This page describes a color clock that displays the time using two RGB LEDs, one for hours and one for minutes, showing time by using the standard color coding used for components (with two additional colors as the standard color coding only has ten colors....
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This Arduino sketch is useful for rescuing ATtiny microcontrollers rendered useless by incorrect fuse settings. It does this by putting the bricked tiny into high-voltage serial programming mode and writingthe fuses to safe values. The Arduino is connected....
-
This project can be used with a standard Hitachi HD44780 (or compatible) controller chip to control it through only 2 wires. There is a variety of shapes and sizes available. Line lengths of 8, 16, 20, 24, 32 and 40 characters are all standard, in one, two....
-
This circuit makes a nice, clean preamp or a clean booster pedal. It is not designed for overdrive, but is designed to be overdrivable. If overdriven, it provides the kind of soft clipping one may expect from JFETs, but it is not optimized to be generally....
-
A second piece of information also came to light recently. I was aware of a story about an original Rife machine schematic which had something to do with Dr O. C. Gruner of Canada who worked with Rife throughout the 1930`s on isolating a fungal form of....
-
Using technology developed by Dr. Royal Rife, Gary Wade has invented an ultrasound scanning rife device that kills harmful microbes and pathogens with multiple frequencies. Many articles on this site tell how....
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Chapter The Gruner Schematic of Philip Hoyland`s Beam Ray Laboratory Rife Machine, There is another feature that the Beam Ray Laboratory Rife Machine had....
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Aubrey Scoon`s early 1940`s Beam Rays Replica Rife Machine, Aubrey Scoon s 1940 s Beam Rays Clinical replica Rife Machine was originally mistaken for a genuine 1938-1939 Beam Rays instrument built by Philip Hoyland and the Beam Rays Corporation....
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The LM317T is an extremely common positive voltage regulator - many laboratory supplies and other equipment are based on it. It can produce any amount between 1. 25V and up to 35V by adjusting the resistance (opposition to current) between its adjustment pin....
-
-
The TV-B-Gone is a tiny infrared remote that can turn off almost any TV. A while ago, I ported the TV-B-Gone software to the Arduino; for details on the port and how it works see my previous post on the Arduino TV-B-Gone. Mitch Altman, the inventor of the....
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Customs by Ripper - Tech page about basic wiring for any vehicle, but motorcycles in particular....
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-
-
How to make a simple induction heater. This project is really simple, and surprisingly effective at heating metals using high frequency magnetic fields....
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One of the simplest ways to make a battery powered High Voltage power supply is to use a common car ignition coil. Ignition coils are a type of induction transformer based on the Tesla Coil invented by Nikola Tesla in 1891. The voltage rise is not given by....
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How to make a simple kirlian effect camera for photographing high voltage corona around objects. Otherwise known as aura photography....
-
The circuit is great for controlling the power delivered to a device such as a fan, LED`s or even transformers and coils. By adjusting the pulse width you can easily control the speed of a fan without sacrificing torque. This particular transistor, the....
-
Make a signal generator from easily obtainable parts. Square wave, variable frequency, variable pulse width. This can be used for many things such as DC motor speed control, lamp or LED dimming, Transformer drivers. Ignition coil circuits and other high....
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This coil operates from 12V or 24V SLA batteries. A pair of car ignition coils are used to provide around 20kV for charging the capacitor bank. The ignition coils are driven by a variable frequency square wave from a 555 timing chip and four large....
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DIY Homemade Tesla Coil Tuner. How to make a Tesla Coil Tuner from easily obtainable parts. Find the resonant frequency of Tesla Coil parts....
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How to make a Voltage multiplier using dides and capacitors, capable of producing extreem high voltage....
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DIY Homemade Plasma Gun. Awesome DIY project showing how to make a real working Plasma gun! The plasma gun is based on a small Tesla coil....
-
The DIY `Plasma Gun` is a small homemade Tesla Coil gun powered by an 18V battery. It also has a special plasma discharge terminal that can fire ionized gas and flames! The whole system is mounted inside the body of an old cordless drill so that is fully....
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How to make a 1kW SRSG Tesla Coil. A Mains powered SRSG (synchronous rotary spark gap) Tesla Coil powered from a 1kVA (10mA 10kV) NST....
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History of Nikola Tesla and Tesla Coils, how a tesla coil works, and an example of a homemade TC. The homemade diy tesla coil is battery operated, and has a gas plasma discharge terminal., Arcs can be made to resemble a double helix. High voltage capacitors,....
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Page 1 of 2 - Frog polarisation - any interest from others in a custom PCB? - posted in Electrics (non-DCC): Greetings I am very slowly building a fairly large layout by myself and despite the allegation that DCC makes for only a two-wire wiring requirement....
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The plumbing is done and the fuel system is done. Final checks on the electrical system are under way. More tidying up and testing of the bike loom. Nearly there. I`ve got onequery though. My 2003 loom has two unused connectors for an alarm system. To me,....
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An LED is an electronic component or semiconductor to be more precise. This means that it is neither a conductor (something that conducts electricity) or insulator (something that does not conduct electricity) - it is something in between. LED is an acronym....
-
The chassis is made of aluminum L-profile (30x30x2 mm) and the candles are made of 13 mm aluminum pipes. The structure is about 35 cm wide and 25 cm high, and assembled with two component glue. The fittings (E10) and bulbs (14V, 3W) are obtained from an old....
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Before starting on the receiver side of the` Chatterbox`, we ought to take a final look at the transmitter itself. The Chatterbox transmitter is built separately, because many constructors will want to use it in conjunction with an existing receiver on 1.....
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This transmitter project is a highly efficient, rugged and simple, low power c. w. unit delivering more than 10W. As it`s crystal controlled with stabilised h. t. , and a buffer stage between the crystal oscillator and power amplifier stages, it produces an....
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Here`s an antenna selector, Preselector, attenuator, preamplifier accessory for every HF amateur transceiver. It can improve your receiver`s IP2 for out-of-band signals and yield good flexibility. My father, I4FAF (an old-timer) and I both very much like....
-
How does one measure small inductances with a precision of at least two, and possibly three, significant digits A search of the literature produced scanty results. One interesting circuit was described in The 2001 ARRL Handbook on p 26. 22. I built a....
-
The main requirements are only a directional antenna (ie a ferrite rod or frame) and a screened case for the works of the set. In the past some competitors have modified ordinary medium wave receivers to cover 160m by retuning the front end. However, most....
-
Having wired the camera with external shutter leads I now needed a way to trip them. They needed to be tripped (i. e. connected together via a relay) at a regular interval, perhaps 2 seconds, starting at launch. I had read that a 555 timer chip configured as....
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Adjust value of R1 to get good performance of sensor LDR, if in your practice with 2. 2 M ohm still turn on the lamp you can add value of R1 with the large of 2. 2 M ohm. R1 and R2 is used as voltage divider. R2 is LDR that resistance will change when LDR in....
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-
-
According electronic schematic of DC driver motor using L293D in figure 2, we can use it to control two DC motor continuously. We can control DC motor one to rotate clock wise and DC motor two to rotate anti clock wise. We also can control all motor to....
-
Maybe you ever use LM555 as timer project before, yes it also nice if you want to make analog timer using LM555. According datasheet LM555 this IC can use for several purpose in electronic project like to adjust timer according time needed. From figure 1....
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-
All components that used in Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F. Main component in this circuit is IC NE555, Led IR, Phototransistor L14F and IC LM1458. Moving sensor / detector schematic diagram divided into....
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To describe the performance or work of electronic schematic of Light Detector Robot as like in figure 1 above we can divide into three parts. In sensor, Microcontroller, and driver dc motor. In this part we use LDR as light detector or sensor. LDR will....
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This project was used to introduce a friend of mine to microcontrollers and circuits. I wanted something that used a variety of microcontroller functionalities and used only parts that I had lying around. I ended up using a PS2 numpad as the key entry....
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The module costs GB38. 00 and the transducer costs a further GB17. 00. In fairness, the Polaroid module does the job it was intended to do, which requires the range, but that job is not to provide the eyes of a small robot. The circuit is designed to be low....
-
Edge Avoider Robot (EAR) is a mobile device, which senses and avoids the absence of surface below it....
-
A Mobile Controlled Robot is a mobile device, which provides wide-range of wireless control ability to your robot unless your cell phone gets out of signal....
-
An obstacle avoiding robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It is developed without micro-controller in order to eliminate critical circuits, difficult programming etc. All you want to do is to just....
-
Bridges allow your robot to control high current motors. They literally "bridge" between the low-current logic circuitry of your robot`s brain to the high current demanded from the motors. Many, but not all, use the common "H" arrangement of control....
-
Pictures and a sample schematic (including pinouts) of an AMP hexadecimal (16-position) switch with screw slot actuator....
-
A light-seeking solar-powered tiny robot based on a BEAM design. Article includes pictures, links, a video, and a schematic....
-
Do-it-yourself Atmel STK505 replacement board allows programming of ATtiny84 and ATtiny861 (14-pin and 20-pin) AVR microcontrollers with the STK500 development kit. Article also describes an ATtiny 8-pin quick setup connector board....
-
A schematic that details the connections to the Clare IXDI404PI chip that is both the brains and the brawn of the Back-And-Forth robot that you can make yourself....
-
Schematic of Big Trak`s motor driver circuit. The toy includes 9112 and 9113 transistors (and sometimes 2N6715) because the 75494 chip can`t supply enough current to run the Big Trak`s motors by itself....
-
Schematic, breadboard photo, parts list, and results of several transistor variations on the classic bipolar hbridge motor driver circuit....
-
The real usefulness of the SR latch comes during input switch transitions. Let`s assume the input switch is a break-before-make and the switch starts in the up position. From the prior analysis, the inputs values when the switch is up are low, low, high,....
Of particular interest to us are 12 Volt DC powered PIR sensors and associated circuits since these can be powered directly from a 12 Volt battery which is in turn charged by wind, solar, or other renewable energy sources. In this article we will look at the....
A solar water heating pump controller is a key component in most solar water heating systems (DIY or otherwise). The controller is there to turn the pump on when the fluid in the solar panel is hotter than the water in the hot water tank (or swimming pool),....
A solar charger for an iPod is no more difficult than making our Solar battery charger. Built in iPod batteries are 3. 7 Volts with the capacity (measured in mAh) dependent on the type of iPod - e. g. 1, 200mAh for a 2nd Gen, 850mAh for a 3rd Gen, 500mAh for....
This invention is a back EMF permanent electromagnetic motor generator and method using a regauging process for capturing available electromagnetic energy in the system. The device is comprised of a rotor with magnets of the same polarity; a timing wheel in....
All you need to do is substitute transistors for the tubes used in these fundamental oscillator circuits to bring this article`s content up to date. Or, maybe you are the owner of a vintage vacuum tube radio and would like to learn a little about how things....
Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still legal for today`s Amateur radio operator. Portions of the 40-meter and 80-meter bands are still reserved exclusively for CW operation. As of 2011 in the....
RF Cafe visitor Jim L. requested that I post this Build Your Own Vibrato article from the December 1957 edition of Popular Electronics. "Make like Elvis with an `electronic` throbbing guitar, " is the pitch line. Vibrato, for the non-musically inclined, is....
The fundamentals of crystals has not changed since this article appeared in a 1960 edition of Popular Electronics. The way they are grown, cut, and packaged has changed fairly significantly. An understanding of how they work at the atomic level has advanced....
In October of 1958 when this article was written, a mere year had passed since the successful launch of Sputnik and a few months later the launch of Echo satellites - the first ever for Russia and the USA, respectively. Prior to that time all satellites were....
RF Cafe visitor David M. wrote to ask that I scan and post this article from the January 1963 edition of Popular Electronics. It is an article written by Philip Hatfield, of the Receiving Tube Department of General Electric that describe a very simple design....
Nixie tubes were used for numeric - and sometimes alpha - displays back in the days before LEDs and LCDs. They were more light bulbs than tubes, but were encapsulated in evacuated glass shells like vacuum tubes and had round, multi-pin bases like tubes.....
Prior to the advent of FET-input digital multimeters (DMMs), the vacuum tube voltmeter (VTVM) was the primary instrument for use when high input impedance was required. For the newcomer to electrical measurements, high input impedance for the measuring....
Leo Esaki invented the tunnel diode in 1957 while working at Sony (Tokyo Tsushin Kogyo at the time). Tunnel diodes have a very narrow, heavily doped p n junction only around 10nm (100 G…) wide that exhibits a broken bandgap, where conduction band electrons....
It had been only a little over a decade since the transistor was invented when this article appeared in the August 1959 edition of Popular Electronics. Transistors were still a mystery to most people, including engineers, technicians, and hobbyists. Author....
In 2011, designing a frequency converter circuit consists in most cases of picking out an IC that has the characteristics you need from a gain and mixer spurious product standpoint, add a couple filters, and a power supply. In many cases the oscillator is....
With a GPS receiver that costs less than a few hundred dollars you can instantly learn your location on the planet-your latitude, longitude, and even altitude-to within a few hundred feet. The output of the VCO is directly connected to a MMIC IC3. This IC....
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....
This article describes a lighting circuit that generates a glowing firebox effect and provides constant illumination forclassification lamps and an interior cab light. It contains all information needed to build the circuit including a detailed schematic,....
Making yourself an alarm is both useful and interesting: but the best part is when you take the remote control out of your pocket, and switch on the alarm while saying to your friends: "I`ve done it in a weekend". Making yourself an alarm gives you maximum....
When the system is placed in a shop or mall, logos and product advertisements are a perfect complement to temperature information. For home use, photos of the kids at the beach or should the temperature drop- in the making of Mr. Snowman are a nice gift for....
I make a real-size printout of the PCB in order to verify dimensions of all parts against it. Should a part be too big or small to match its PCB pads, I can adjust PCB layout or try to findia compatible part before the hard work starts. Once all parts are....
Snap all connectors on to the flat cable (a small vice will do the job). You get an instant male-male, male-female, female-female serial adaptor, plus a short extender cord. A must-have tool if you`re planning to play with serial ports. You can even put an....
A new generation of intelligent, scriptable sensors/controllers is around the corner. Up to date, the classical approach at the heart of many simple machines consisted of separated thermometer and control units. By contrast, my design is a unified....
This page describes a color clock that displays the time using two RGB LEDs, one for hours and one for minutes, showing time by using the standard color coding used for components (with two additional colors as the standard color coding only has ten colors....
This Arduino sketch is useful for rescuing ATtiny microcontrollers rendered useless by incorrect fuse settings. It does this by putting the bricked tiny into high-voltage serial programming mode and writingthe fuses to safe values. The Arduino is connected....
This project can be used with a standard Hitachi HD44780 (or compatible) controller chip to control it through only 2 wires. There is a variety of shapes and sizes available. Line lengths of 8, 16, 20, 24, 32 and 40 characters are all standard, in one, two....
This circuit makes a nice, clean preamp or a clean booster pedal. It is not designed for overdrive, but is designed to be overdrivable. If overdriven, it provides the kind of soft clipping one may expect from JFETs, but it is not optimized to be generally....
A second piece of information also came to light recently. I was aware of a story about an original Rife machine schematic which had something to do with Dr O. C. Gruner of Canada who worked with Rife throughout the 1930`s on isolating a fungal form of....
Using technology developed by Dr. Royal Rife, Gary Wade has invented an ultrasound scanning rife device that kills harmful microbes and pathogens with multiple frequencies. Many articles on this site tell how....
Chapter The Gruner Schematic of Philip Hoyland`s Beam Ray Laboratory Rife Machine, There is another feature that the Beam Ray Laboratory Rife Machine had....
Aubrey Scoon`s early 1940`s Beam Rays Replica Rife Machine, Aubrey Scoon s 1940 s Beam Rays Clinical replica Rife Machine was originally mistaken for a genuine 1938-1939 Beam Rays instrument built by Philip Hoyland and the Beam Rays Corporation....
The LM317T is an extremely common positive voltage regulator - many laboratory supplies and other equipment are based on it. It can produce any amount between 1. 25V and up to 35V by adjusting the resistance (opposition to current) between its adjustment pin....
The TV-B-Gone is a tiny infrared remote that can turn off almost any TV. A while ago, I ported the TV-B-Gone software to the Arduino; for details on the port and how it works see my previous post on the Arduino TV-B-Gone. Mitch Altman, the inventor of the....
Customs by Ripper - Tech page about basic wiring for any vehicle, but motorcycles in particular....
How to make a simple induction heater. This project is really simple, and surprisingly effective at heating metals using high frequency magnetic fields....
One of the simplest ways to make a battery powered High Voltage power supply is to use a common car ignition coil. Ignition coils are a type of induction transformer based on the Tesla Coil invented by Nikola Tesla in 1891. The voltage rise is not given by....
How to make a simple kirlian effect camera for photographing high voltage corona around objects. Otherwise known as aura photography....
The circuit is great for controlling the power delivered to a device such as a fan, LED`s or even transformers and coils. By adjusting the pulse width you can easily control the speed of a fan without sacrificing torque. This particular transistor, the....
Make a signal generator from easily obtainable parts. Square wave, variable frequency, variable pulse width. This can be used for many things such as DC motor speed control, lamp or LED dimming, Transformer drivers. Ignition coil circuits and other high....
This coil operates from 12V or 24V SLA batteries. A pair of car ignition coils are used to provide around 20kV for charging the capacitor bank. The ignition coils are driven by a variable frequency square wave from a 555 timing chip and four large....
DIY Homemade Tesla Coil Tuner. How to make a Tesla Coil Tuner from easily obtainable parts. Find the resonant frequency of Tesla Coil parts....
How to make a Voltage multiplier using dides and capacitors, capable of producing extreem high voltage....
DIY Homemade Plasma Gun. Awesome DIY project showing how to make a real working Plasma gun! The plasma gun is based on a small Tesla coil....
The DIY `Plasma Gun` is a small homemade Tesla Coil gun powered by an 18V battery. It also has a special plasma discharge terminal that can fire ionized gas and flames! The whole system is mounted inside the body of an old cordless drill so that is fully....
How to make a 1kW SRSG Tesla Coil. A Mains powered SRSG (synchronous rotary spark gap) Tesla Coil powered from a 1kVA (10mA 10kV) NST....
History of Nikola Tesla and Tesla Coils, how a tesla coil works, and an example of a homemade TC. The homemade diy tesla coil is battery operated, and has a gas plasma discharge terminal., Arcs can be made to resemble a double helix. High voltage capacitors,....
Page 1 of 2 - Frog polarisation - any interest from others in a custom PCB? - posted in Electrics (non-DCC): Greetings I am very slowly building a fairly large layout by myself and despite the allegation that DCC makes for only a two-wire wiring requirement....
The plumbing is done and the fuel system is done. Final checks on the electrical system are under way. More tidying up and testing of the bike loom. Nearly there. I`ve got onequery though. My 2003 loom has two unused connectors for an alarm system. To me,....
An LED is an electronic component or semiconductor to be more precise. This means that it is neither a conductor (something that conducts electricity) or insulator (something that does not conduct electricity) - it is something in between. LED is an acronym....
The chassis is made of aluminum L-profile (30x30x2 mm) and the candles are made of 13 mm aluminum pipes. The structure is about 35 cm wide and 25 cm high, and assembled with two component glue. The fittings (E10) and bulbs (14V, 3W) are obtained from an old....
Before starting on the receiver side of the` Chatterbox`, we ought to take a final look at the transmitter itself. The Chatterbox transmitter is built separately, because many constructors will want to use it in conjunction with an existing receiver on 1.....
Here`s an antenna selector, Preselector, attenuator, preamplifier accessory for every HF amateur transceiver. It can improve your receiver`s IP2 for out-of-band signals and yield good flexibility. My father, I4FAF (an old-timer) and I both very much like....
How does one measure small inductances with a precision of at least two, and possibly three, significant digits A search of the literature produced scanty results. One interesting circuit was described in The 2001 ARRL Handbook on p 26. 22. I built a....
The main requirements are only a directional antenna (ie a ferrite rod or frame) and a screened case for the works of the set. In the past some competitors have modified ordinary medium wave receivers to cover 160m by retuning the front end. However, most....
Having wired the camera with external shutter leads I now needed a way to trip them. They needed to be tripped (i. e. connected together via a relay) at a regular interval, perhaps 2 seconds, starting at launch. I had read that a 555 timer chip configured as....
Adjust value of R1 to get good performance of sensor LDR, if in your practice with 2. 2 M ohm still turn on the lamp you can add value of R1 with the large of 2. 2 M ohm. R1 and R2 is used as voltage divider. R2 is LDR that resistance will change when LDR in....
According electronic schematic of DC driver motor using L293D in figure 2, we can use it to control two DC motor continuously. We can control DC motor one to rotate clock wise and DC motor two to rotate anti clock wise. We also can control all motor to....
Maybe you ever use LM555 as timer project before, yes it also nice if you want to make analog timer using LM555. According datasheet LM555 this IC can use for several purpose in electronic project like to adjust timer according time needed. From figure 1....
All components that used in Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F. Main component in this circuit is IC NE555, Led IR, Phototransistor L14F and IC LM1458. Moving sensor / detector schematic diagram divided into....
To describe the performance or work of electronic schematic of Light Detector Robot as like in figure 1 above we can divide into three parts. In sensor, Microcontroller, and driver dc motor. In this part we use LDR as light detector or sensor. LDR will....
The module costs GB38. 00 and the transducer costs a further GB17. 00. In fairness, the Polaroid module does the job it was intended to do, which requires the range, but that job is not to provide the eyes of a small robot. The circuit is designed to be low....
Edge Avoider Robot (EAR) is a mobile device, which senses and avoids the absence of surface below it....
A Mobile Controlled Robot is a mobile device, which provides wide-range of wireless control ability to your robot unless your cell phone gets out of signal....
An obstacle avoiding robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It is developed without micro-controller in order to eliminate critical circuits, difficult programming etc. All you want to do is to just....
Bridges allow your robot to control high current motors. They literally "bridge" between the low-current logic circuitry of your robot`s brain to the high current demanded from the motors. Many, but not all, use the common "H" arrangement of control....
Pictures and a sample schematic (including pinouts) of an AMP hexadecimal (16-position) switch with screw slot actuator....
A light-seeking solar-powered tiny robot based on a BEAM design. Article includes pictures, links, a video, and a schematic....
Do-it-yourself Atmel STK505 replacement board allows programming of ATtiny84 and ATtiny861 (14-pin and 20-pin) AVR microcontrollers with the STK500 development kit. Article also describes an ATtiny 8-pin quick setup connector board....
A schematic that details the connections to the Clare IXDI404PI chip that is both the brains and the brawn of the Back-And-Forth robot that you can make yourself....
Schematic of Big Trak`s motor driver circuit. The toy includes 9112 and 9113 transistors (and sometimes 2N6715) because the 75494 chip can`t supply enough current to run the Big Trak`s motors by itself....
Schematic, breadboard photo, parts list, and results of several transistor variations on the classic bipolar hbridge motor driver circuit....
The real usefulness of the SR latch comes during input switch transitions. Let`s assume the input switch is a break-before-make and the switch starts in the up position. From the prior analysis, the inputs values when the switch is up are low, low, high,....
