Top Circuits Page 132
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Well, I guess every hobbyist some when comes up with ideas of controlling or measuring something with a PC. Of course the idea is tempting, there are so many easy-to-learn program languages available for PCs today that almost everyone can write the software....
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In order to understand how the following circuits are connected to each other you have to read the concept chapter first. Of course it is up to you to take just one or two of these circuits for your own developments. Lets start with the 6 MHz oscillator. The....
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The build makes use of a 10 x 20 grid of RGB LEDs controlled by the myRIO. It`s played by using a web interface on any device, as long as you have WebSockets support. [Sam] had originally built it using an Arduino at the heart, but wanted a stand-alone....
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Atmel`s XMEGA series of microcontrollers are neat little pieces of hardware; with a very fast clock, a ton of IO, USB, and up to 8 UART ports, these neat little chips serve as a nice bridge between AVRs and PICs and the very powerful ARM chips coming out on....
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Just hook this Alarm Phone Dialer up to something you would like to monitor, for example, a high water alarm, low temperature alarm, back window, garage door, etc. When the system is activated it will call a number of programmed numbers to let you know the....
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Piezo buzzers can be found everywhere, next time you throw out an old smoke detector be sure to remove the piezoelectric element from it and stash it in your parts bin. If you want to monitor sound with a piezoelectric element it`s not that easy since the....
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Electronics Nerd shows us how to reverse engineer an IR remote control signal. By understanding what type of signal is being transmitted out of the remote control allows a microcontroller to simulate the code to control the Hampton Bay Air Conditioner. "In....
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Here's the schematic for my Bee Counter test board with the functional units labeled to make them easier to discuss. This test board has the same circuitry as the larger board, but with only 4 gates instead of 44 to save a TON of time and money debugging....
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According to the datasheet, they`ll switch about 160 kW at up to 10 kV (7. 2 kV typical). Sadly this is not enough for the quarter shrinker, but I think I see a miniature ring flipper in my future I`m very excited to be speaking at Ada`s Technical Books on....
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The Altera USB-Blaster is an efficient USB JTAG programmer. Clones sell for US$10 or less. The programmer comes with a comprehensive manual with a pinout diagram for the JTAG device side. [1] That diagram unfortunately shows no orientation. There should be a....
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The goal of this project was to make an interactive baseball game inspired by pinball. There is a solenoid-powered bat and a pitching mechanism that utilizes a motor and lever arm setup. Both of these are controlled by buttons so that two people can play....
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Your task is to use the PIC to log data from an analog input on an EEPROM, and after the data collection is over, to send the data back from the EEPROM to a PC running matlab. Use an interrupt service routine to read an analog input and write the value to an....
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Several milliliters of ferrofluid exhibiting acute normal-field instability due to the magnetic field created by a neodymium iron boron magnet beneath the cup The goal of this project was to create a visually appealing and mathematically interesting art....
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I2C is pronounced "I squared C" and stands for Inter-Integrated Circuit. This protocol was designed by Phillips Semiconductors around 1992 to allow easy communication between components on the same circuit board and can achieve transfer rates of up to 400....
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An external EEPROM can be useful for several different reasons. External EEPROMs allow much more data to be stored than is available on the 18F4520. In addition, EEPROM memory saves state when power is removed. In this project, we interfaced to a Microchip....
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Optoreflector sensors contain a matched infrared transmitter (LED) and infrared receiver (usually a phototransistor ) pair. These devices work by measuring the amount of light that is reflected into the receiver. Because the receiver also responds to ambient....
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The "Programmable Stiffness Joint" is a device which is able to internally modify the rotational stiffness of a simple pivot joint. It is intended to serve as a proof-of-concept for future work in developing a model for determining the respective damping and....
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To control a stepper motor, you have to energize each winding individually in a specific and timed order. The energizing is accomplished by a driver circuit (an amplifier). The timing is performed by an indexer circuit and the objective (go forward, go....
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The Ping Ultrasonic Distance Sensor by Parallax has three pins. These pins are +5V, I/O, and Ground. In order to activate the sensor, a 5 microsecond 5V signal must be sent to the I/O pin. The sensor then waits 750 microseconds before sending an ultrasonic....
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Two detector systems in the Hall-A spectrometers make use of potentially flammable gasses: the Vertical Drift Chambers (VDC) and the Focal Plane Polarimeter (FPP) straw tubes. This document is intended to address the practical need for a users manual for....
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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 is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876.....
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In this post, we shall be covering on how to construct a H-Bridge Motor Driver circuit using simple MOSFET`s and Transistors. The main feature of this H-Bridge is that the motor can be driven in both directions. AnH-bridgeis a circuitthat allows a voltage to....
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A very good example of code for EXTFSK that was called COMFSK. (The name has been changed to ExtFsk106) With the COMFSK plug-in, you can do PTT/FSK through legacy serial port, USB-serial adapter, or legacy parallel port (USB-parallel adapter not supported).....
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This page provides links to software and hardware designs contributed by Handy Board users. If you would like to contribute some work of your own to the Handy Board community, please contact Fred Martin. Thanks! George Musser contributed an adaptation of....
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the timer will generate the basic period (for example 20ms) and with some associated variables will be possible to "fire" an I/O pin to generate the signal. For example, using a 8 bit variable, we can divide the generated frequency in "chunks" of 256 (8 bit....
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A solar panel is, as the name says, a panel which collects solar energy and converts it to electricity. At least that`s my simple view of it. A solar panel consists of a background on which solar cells are "stuck". These cells are interconnected and....
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Usually the project is a variation on the POV toy, which you see around online all of the time as a beginner electronics project. However, we decided to deviate from our traditional path this year and create our own synthesizer kit, with an SPI DAC, Audio....
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This project was deliberately aimed at developing a very low cost cosmic ray detector using common Fluorescent Tubes. It was based on variation of an experiment performed in 2000 by the CERN (European Organization for Nuclear Research) laboratories by Dr.....
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Bluetooth is an open wireless device technology standard for exchanging data over short distances from fixed and mobile devices(using short wavelength radio transmissions), creating personal area networks (PANs) with high levels of security. The Bluetooth....
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This is just my attempt in making the simplest and kinda smallest photovore. Well, it`s not that good-looking though, but it`s a great start for some beginners. It`s also my own version of Dozer photovore. Right here! Woah, it`s been a long time since my....
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Two identical integrated circuits, U1 and U2, known as "hex inverters" are used for the theremin`s primary functions. They are CMOS (Complimentary Symmetry Metal Oxide Semiconductor) devices, typically used in digital circuits to perform a logic function....
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The high-tech credit card has been nicknamed "microcontroller super card" because of all the great improvement ideas. I showed how to first verify the code, and then upload on to the arduino board. I then wrote a code for the counter to go from 0 to 9 using....
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Though the primary target audience of the USB08 Reference Design are Developers of Mikrocontroller Firmware and Hardware, Windows Driver and Application Software issues are also covered by the USB08 Project. USB (Universal Serial Bus) is a standardized bus....
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The expansion board had 6, but I didn`t think that 6 servo ports were worth the price of the expansion. I ended up making a fully reversible modification to my handyboard that gave me 16 servo ports costing a total of about $2, two of the motor ports and a....
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The circuit protects a solid-state relay from overloads. The circuit limits current, automatically discon-nects the load after detecting a short circuit, and develops a fault-condition output signal. In normal operation, the controlling ptP sets the....
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Here is a simple code for reading tags from the id12 RFID reader. It should be quite easy to modify if you know the dataformat your reader is sending out. Here is how to hook it up for serial communications, either using a microcontroller like arduino or....
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With the phasing out of game, serial and parallel ports from modern computers and the ever increasing popularity of USB, it makes sense that hobbyists start getting to grips working with USB. Unfortunately, USB is not a simple protocol and can be daunting to....
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tutorials reviews software airsoft Introduction This project illustrates how to connect a PC to a small FRS radio via a simple RS-232 interface. There are several reasons that you may want to....
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This 6" x 18" clock needs 52 light sources. It may one day allow humans to know the time without glasses. For 25 years we searched for clocks big enough to be see without glasses. No large clock existed commercially so our only resort was to have clocks....
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Modification of the Icom IC-718 Transceiver for ALE, to de-activate the transmit bandpass relays during receive and scanning....
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Interface Information for Computer to Radio using PCALE and other ALE software controllers. HFLINK is the international resource for ALE Automatic Link Establishment High Frequency Communications, HF Digital Messaging, Emergency / Disaster Relief,....
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I bought one CI-22BG tube and one CI-3BG tube for total of 16G. Because I didn`t have anything radioactive to test my Geiger counter, I also ordered a piece of radioactive Fiesta dinnerware from ebay. Red Fiestware used to have uranium oxide in its glaze....
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This is a design schematic Class A power amplifier. This is a close as possible in operating parameter the Under Classes is class B, to aid comparison ; in particular the NFB factor remains 30dB at 20 kHz. The front end is similiar to class B amplifier. This....
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This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV / 0C is exploited for this application to create an accurate electronic thermometer. To display the measured....
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IC TA8210AH By using this you can apply a series of audio power amplifier is the car audio system. In general, all the speakers in the car using a subwoofer speaker, and woofer. Because the car is not big room so the sound is being required is not too high.....
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This amplifier was designed to provide a use for the otherwise useless TO3 power transistors that many hobbyists have in their junk pile. With good construction the module is capable of high quality performance and is rated to 300 watts into a 4 ohm load....
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An infrared remote control tester circuit that can be made without spenting much money. This IR tester build around an infrared reciever module TSOP1738. We can observe the remote control state by listening to the buzzer sound. The circuit is very sensitive....
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Acoustic spectrum is extended by the 20Hz frequency is very low and reaches as high frequency 20000Hz. In the low frequency is lowered sense of direction. This reasoning leads us to attribute to the speaker`s use of very low frequency. Making it to you we....
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digital tachometer & speedometer using seven segment display, but I failed to do it the right way. The circuits I used before were too crowded with ICs & other components. Then I managed to build the LED tachomter. Later, I got a stepper motor & used it as a....
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FM Transmitter Circuit An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier. Circuit Diagram Parts List R1 4K7 R4 150K R7 3K9 (2K7)R2 4K7 R5 220R R8 120R (82R)R3 4K7 R6 4K7A....
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FM302E-I-type FM transmitter exciter is the NEC Corporation, Japan`s HPB with a 1210 motherboard. Direct frequency modulation of the carrier, using phase-locked frequency stabilization and frequency synthesis. The front power amplifier (BLF-177 FET) ....
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an FM modulator that modulate a carrier frequency with the composite signal, and an RF amplifier that provide enough power to be transmitted through antenna. Here is the schematic diagram of theFM transmitter circuit: The core of this stereo FM tra....
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This indicates like LM3914 in dot-mode. It is a drawing i made made to troubleshoot a gadget, around two decades ago. Strangely it had a echo of a design i had made into a 7107 dpm years before that. Now i am scanning all my drawing and notes, useful or not.....
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Modulation is the process of changing some characteristics (e. g. amplitude, frequency or phase) of a carrier wave in accordance with the intensity of the signal is known as modulation. The figure shows the electronics circuit of a simple am modulator. It is....
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This is the circuit diagram of touch activated alarm system which still activated on load shedding. Alarm system will be activated when someone touch the touch plate which is called trigger. In this circuit the most updated part is automatic battery....
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This is the most popular IR Remote control circuit for home appliances like lamp, fan, radio, tv etc to make the appliance turn on/off from a TV, VCD or DVD remote control. It is very simple to build because of few components and simple design. The circuit....
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There`s no substitute for sheer power- low efficiency speakers, outdoor sound systems, or maybe you like the full flavour of the dynamic range of a high power amp. Whatever your requirement-this super power module should fit the bill. How it works: The....
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A 12v battery pack from a PowerWheels(r) car and two planks of wood with several nails punched through each. The nails were each wrapped with a couple turns of speaker wire that ran out to his ignitors, and the other leg came back to a central positive....
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Meteoplug is a client-server. The client application needs minimal storage and computing power, which allows for embedding into "computers" of minimal size and with minimal power demands down to1 watt(depending on efficiency of power supply itcan be 1-2....
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The original scale on my voltmeter was from 0 to 30volts. I made a new scale by removing the old scale from the meter and scanning it into a paint package on my PC. I deleted the old numbers but left the scale in tact. I then just added my new numbers on the....
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A continuity tester is handy for checking that there is a conducting path between two points. The following circuit has the advantage that it is very sensitive and it gives both a visual and audible indication of continuity. An audible tester is handy since....
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A block diagram symbol is used to represent the PCB schematic on block connection diagrams. The following diagram shows the block diagram and the circuit that it represents. Any number of signal blocks can be connected in series. To be able to show all of....
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This circuit controls a Searchlight type signal head and produces solid - RED, YELLOW or GREEN indications. The signals can be connected for NORMAL or APPROACH type lighting of the Green signal. The circuit uses a LM556 - Dual Timer IC in a complimentary....
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For phototransistors a value of 470K ohms will work for most room light situations. If the light is dim, selecting a higher value resistor such as 1 Megohm will give better sensitivity. This High Impedance Test Voltmeter circuit can also be used for testing....
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The circuit on this page is for a visible and infrared light detector circuitboard that has 8 detectors. LM339 voltage comparators are the active element. These detectors can be used as part of other light detector circuits shown on other pages at this site....
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The circuits presented here will prevent turnouts from being thrown while a train is on a switch, ideal where the switch cannot be seen by the operator. They use phototransistor sensors to detect the train and have a short time delay to compensate for gaps....
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The circuits on this page are basic designs for "Diode Matrix" switch machine control systems that can be used to operate "Stall Motor" switch machines in `Ladder` type storage yards or other multiple turnout areas. The principle for these diode matrix....
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This circuit detects spikes in voltage around 18v. It is used to detect when a battery becomes disconnected on a running motorcycle. When that happens, the regulator is unable to maintain a steady voltage so the voltage fluctuates wildly. Even though the....
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An amplifier to go with an antique Meissner AM High Fidelity tuner that I had restored. But by the time the amp was finished it sounded so good that it has become my amp of choice for listening to CDs while working in the shop. The only parts purchased new....
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The basic idea is to turn the motor just a little bit every 15 seconds or so. A monofilament line transmits the motion to the ornament. It gets wound by the motor and slowly unwinds by turning the ornament. The charging path has a 1 megohm resistor in it,....
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The purpose of this project was to be able to monitor the power consumption at my house. In addition to total usage, I wanted to be able to separately monitor & compare usage of major appliances (water heater, heat pump, furnace, etc. ). This would require....
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The controller box is the MegaSquirt EFI Hardware. The MegaSpark was originally designed & tested on v2. 2, but may work on other versions. The software was designed to yield a fully functioning advance controller with no modifications to the MegaSquirt....
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The following circuits are presented in a logical order (unlike the way they were designed) from initial power-up to the frills tacked onto the end of the project. A less organized and more stream of consciousness version of the Mark II design can be found....
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This is a handmade prototype research project, intended to demonstrate what goes into a tracker and to facilitate developing tracker-related magnetic-field models. This is not a product. Functions needed in a product but not needed to explore field model....
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Whether the tuning aid can be trusted on 70 MHz is a bit of a complex matter, but wtih me it seems to provide a suitable loading factor, when used for tuning when the attenuator is activated. This attenuator is actually a frequency dependent network of a....
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The audio bandpass filter described is useful for amplification and filtering weak AM TV video carriers. For example, a DFM (digital frequency audio multimeter) may have insufficient input sensitivity for measuring extremely weak SSB TV video audio signals.....
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The following graph shows the measured temperature rise above ambient for a typical range of power supply voltages. The upper two plot lines are for no heatsink, with the LM4702 mounted above the PCB (as it normally would be) and mounted below the PCB (which....
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One of the simplest ways to show autonomous motion of a robot is to have it follow a line. In fact there are competitions for the fastest or for robots that can follow complex line mazes. Lines are either high contrast black lines on a white background or....
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A dual DC motor controller that utilizes an H-bridge controller chip. As well as the basic features of the H-bridge driver chip including thermal and over-current protection, the circuit presented in this project supports dual 12V/5V regulated power....
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Are you situated in an area where there is significant QRM/QRN noise (QRM: man-made noise and QRN: naturally occurring noise) present on the HF Band making it impossible to receive weak signals Why not try building this noise canceller which nulls out and....
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I have been running it off 12v or so. I find that it works very well. I built it to use with a Ten Tec Eagle, which (somewhat surprisingly) does not have a spot tone or any other kind of zero beat indicator. My only quibble with this indicator thus far is....
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The main system is the user interface and control system. The phone line was chosen as the method of interfacing because it has distinct advantages over other systems in communicating information from a distance. The next image serves as a block diagram for....
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A very simple 10 LED roulette wheel circuit is shown here. pressing the button starts the LEDs in a rotational motion (sequencing) at full swing initially, and gradually slows down, until it stops to a particular, randomly selected LED. The randomness of the....
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