Top Circuits Page 160
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Design and Dimensioning of Aktive Low-Pass and High-Pass Filters. Sallen-Key and Multiple Feedback Topologies, Spice Netlist Generator....
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The square wave is generated by a 7555 timer operating with a supply of 10V and thus generating exactly this voltage as output voltage. With the single quadrant multiplier (RC4200, Fairchild, obsolete) the two quadrant square root circuit is formed. 10V of....
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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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A place to share and discover articles and documents. Upload what you know, share with others, or just find some articles by searching from our database....
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These require power to work. Sometimes, that`s a battery you put into the mic. Sometimes it`s a separate dedicated power supply with a special multi-pin cable. But most often these microphones use phantom power. This is power deliveredby a mixer or console,....
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A voltage regulator is designed to provide a fixed voltage to any load. Inherently this means it must provide any current through that load to satisfy Ohm`s Law of I = V/R. As R approaches zero, for example when the output is shorted to ground, for a fixed V....
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Boost circuits are an awesome way to power microcontrollers. Instead of 4AA batteries or a 9V (usually regulated down to 5V or 3. 3V), you just boost one or two AA`s up to your desired voltage. The only problems are that boost ICs (like these two ) are a....
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Software, Applications and Programming Resources. Amateur Radio and Travel. Stereogram Art....
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The camera and shutter control are completely self contained and can be used in any situation where you would like to take a number of photos automatically at a set interval in time. In this case it is for Kite Aerial Photography, but I have used this camera....
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One PIC to act as a keypad driver though plus some primitive stuff to tie them together (when the time runs out disable the keypad and beep, when the correct button is pressed increment the score counter and regenerate). The random number generator is really....
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That HID headlights + small slim line plates REDUCE the distance a police car can ambush you (lock in with laser/LIDAR) to get....
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Trying to figure out why I`m getting hard shifts on low throttle positions. I have a couple questions as I found some components not holding vacuum. I`....
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As I often drive on motorways, I always and frequently use the direction indicators in order to show the lane change. I normally did this by holding a ....
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My `89 2.6 outside thermometer (Celsius) has blacked out and I was lucky by finding a good e-bayer who has one.. I bought it but appartently it was....
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A simple schematic detailing a 15Hz zapper with correct component values....
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An advanced radionics schematic to increase the power output of your tuning circuit....
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The 1812 Overture by Tchaikovsky lasts for 14 minutes and 40 seconds. It is scored for a philharmonic orchestra having up to eighty musicians, playing a wide variety of instruments. The instruments include strings: violins, cellos, basses, brass: trumpets,....
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How to make a binary clock using a PIC microcontroller using multiplexing to drive an LED matrix....
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For the other components you should have most of the stuff lying around if you have doneany type of electronics except for the programmer, RS232 chip and PIC. For getting information out of the project and into the PC a USB to RS232 is needed and this can....
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FIG. 1 (A) illustrates the circuit diagram of one embodiment of the fluid level detector of the present design. The supply voltage for this circuit is typically provided by a 12-volt automobile battery which is reduced to a 5-volt DC source voltage by means....
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Coin detector and counter : How to detect different types of coins from their effect on an oscillating magnetic field....
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This PIC microcontroller EEPROM project saves the temperature from an LM35DZ IC to the PIC`s internal long term data storage area. The project follows on from the last project using the virtually the same hardware. It stores temperature readings internally....
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Electromagnetic flow meter : How to measure fluid flow using a magnatic field....
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and C code for a frequency counter circuit operating up to about 50MHz using a multiplexed seven segment display and uses timer 1 to count edges of the input signal....
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This system includes a processor which may have been a microcontroller but it did not have alarge memory and so an obvious improvment to this system is to use the internal RAM and ROM in a modern microcontroller. Note There are lots of circuit elements here....
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You can use any PIC microcontroller that has an ADC and enough memory to hold the program. The LED is pulsed after every ADC acquisition to indicate that the processor is alive - so you can tell if the software is active. You can recompile the lcd volt....
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Led brightness control circuit : How to use a simple circuit to control the brightness level of an LED display....
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How to drive an dot matrix led display. This project shows you how to drive one with 64 LEDs (8 rows by 8 columns) or less e.g. 35 LEDs (7 rows by 5 columns)....
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Multiple unit radio control : How to make a multi-iunit radio control system....
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This motor overload circuit does not simply disallow overloading since it is permissible to overdrive a system but only if it is done for a short time (typically dependent on heat buildup). An overload detection circuit protects a motor against currents....
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and C code for a PIC frequency counter operating up to about 50MHz. The project uses an HD47880 LCD for the display and uses timer 1 to count edges of the input signal....
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With the connections made in this order on the connector it will not matter if the connector is placed the wrong way round as GND and VCC are then applied to clock and data. If VCC and GND had been at opposite ends of the connector then there would be a....
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A pic programmer circuit that works using long cables from PC to programmer....
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For the PIC sonar range finding project a PIC microcontroller is ideal. It has a capture timer that can accurately measure the ultrasonic echo time so the distance from the object can be calculated....
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A PIC16F84 introduction with ICSP programmer connection and circuit example....
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PIC RTC: A Real Time Clock IC using the DS1307 and a PIC micro. This PIC project uses an I2C Real Time Clock chip and display to create a four digit standard desk clock....
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The circuit simply consists of a PIC micro, ICSP interface, an RS232 level translator and an HD44780 LCD. Initially a scrolling message is displayed using show_intro. When a serial input is detected the main program starts. All keys are now either text....
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A servo controller for controlling a servo motor from the serial port using a PIC Microcontroller. Project includes source code description and schematics....
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How to generate the signal for contolling a standard (RC) servo motor using a PIC microcontroller....
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A sound origin direction indicator comprising a flat square-shaped form having four sound transducer/amplifier units mounted at its four corners, four rows of solid state lamps radiating from its center to the corners and an electronics system attached to....
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Ultrasonic atomizer circuit : How to generate an atomized water mist using ultrasonic sound waves....
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Ultrasonic Rat Repellent circuit and Notes on ultrasonic experiments on rats....
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Here is information on how to build a diy time lapse circuit which will allows a camera to automaticly take photos between a certain time interval. Those photos then can be then to create time lapse film. It is used in this circuit a 2, 5 to 3, 5 stereo....
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The American Electrician gives a description of one wherein a glass battery jar, six inches by eight inches, is wound with 60 to 80 turns of American wire gauge No. 18 B & S magnet wire. Into this is slipped a primary consisting of eight to ten turns of AWG....
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Filter Regulators, solenoid valves, Quick Exhaust Valves, Flowline Pilots - Welcome to Bifold Fluidpower Ltd....
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The Nizo S156 is a really excellent compact camera with a great range of features. This thing is so small you can slip it into a coat pocket, yet it will give truly superb results. Put it on a long boom, car bonnet or stick it on a helmet for the ultimate P.....
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To invoke the Spectrum +3 diagnostic routines, first reset the machine while holding the BREAK key down. This will go into the test card dispray. Now hold down the QAZMLP keys for a few seconds unti the diagnostic title is displayed. Now follow the on screen....
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I built the LM386 amplifier section, and it pretty much works. I purchased a five-conductor headphone jack, which passes the left and right channels through to the mono amplifier section when nothing is plugged in, but disconnects the amplifier section when....
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This is the first circuit I created. Working principles are described in the "Basic Info" page. The transistor connected to the led isn`t really necessary, but I prefer using it to get maximum power. The Pushbutton SW1 is placed between the battery and the....
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The Kill A Watt is an awesome product; it measures volts, amps and power factor of an individual appliance which can be used to calculate power, cost to run, etc. It`s also quite hackable. But I wanted something that would give me the same data for my whole....
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I was particularly enamored over the mechanics of the Quantized Random Voltage function. The thought occurred to me that, instead of having fixed quantization steps for each output of of the 4006 shift register, it might be fun to actually make the....
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The DC Brushless Fan is the best solution for now, but some predictions are that computers will soon be at 70dBA or the same noise level of freeway traffic. In the future we all may be liquid cooling but the heat has to go somewhere. Since the DC Brushless....
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Building a computer-controlled LED lamp with an ATMEL microcontroller....
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This project has an impossible requirement or uses parts that are no longer available. It is here for reference or inspiration only. Consider it unsupported . This project displays telephone numbers decoded from tones. Specifically, telephone touchtones.....
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The 8051 became widely popular after Intel allowed other manufacturers to make and market any flavors of the 8051 they please with the condition that they remain code-compatible with the 8051...
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This is a simplified schematic diagram for a home-made scanning backlight driven by an Arduino, an open-source electronics prototyping platform. The Arduino monitors the VSYNC signal (input-lag compensated) and executes a backlight scanning sequence, using....
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Hi everyone, I`ve been looking at the ""proper"" voltages for charging, and especially at this....
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This sign I designed uses no microprocessor. It has an eprom and multiple counters. As in most electric signs, the LEDs are matrixed, and strobed very quickly to make it possible for all 70 LEDs to appear lit. This sign is strobed horizontally, unlike most....
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The oxygen sensor simulator as built on a protoboard. Note the cigarette lighter plug used for power source. The adjustment knob is at the left, and the switch is on the right. The red indicator LED is in the middle. Only use red, because the voltage drop of....
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This single IC circuit which is based on the Wien Bridge Oscillator, produces low distortion sine waves in the range of 15 Hz up to 22KHz in two ranges. The two output voltage ranges are from about 0-250mV and 0-2. 5Vrms. The image to the right shows an....
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Simple 7805 charging circuit to recharge smart phones like the Incredible. Similar in design to the Minty Boost....
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A Tremolo is an effect unit that modulates the amplitude of the guitar signal, usually in a triangular waveform. This version uses a square waveform, for a more switching, choppingkind of effect. This kind of effect can be heard in the beginning of Plant....
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It`s a slight redesign of a board I did before last year`s AVC. What`s it for Not telling yet. :) I can say this. It`s an Arduino clone that will speak serial on one set of pins via NewSoftSerial and I2C on the standard set of pins. It has an FTDI header for....
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This tutorial is in continuation with previous tutorials on 8051 Assembly Programming. Now we will learn how to give input and output instructions to 8051 microcontroller(s) using assembly programming language. The microcontroller has total forty pins in....
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The most commonly used LCDs found in the market today are 1 Line, 2 Line or 4 Line LCDs which have only one controller and support at most 80 characters, whereas LCDs supporting more than 80 characters make use of 2 HD44780 controllers. Apart from displaying....
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A line follower is an autonomous bot that can follow a specific colored line painted on a surface of different contrast, such as white on black....
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The easiest solution would be to take a cheap wireless toy car take out its receiver module along with its remote and use them in your robot. The other way round is this to make your own RF remote We will be using ASK (Amplitude Shift Keying) based Tx/Rx....
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A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately....
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Microcontrollers are just silicon wafers until we tell them what to do, program them according to our requirement.Read More....
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The ULN2003 internally employs high voltage, high current darlington arrays each containing seven open collector darlington pairs with common emitters.Read More....
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Thesis by Rafael Bräg at the University of Canterbury, New Zealand in cooperation with the Universität Karlsruhe, Institut Elektrotechnik und Hochspannungstechnik....
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The circuit I used is a very common one. You can do a google search for 555 timer LED blinker and find hundreds of schematis that will fit the bill. Here is the schematic for my particular flavor of LED blinker: The variable resistor (100K) in the....
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Following the 4th Apple iPad charger failing and not wanting to spent even more money with Apple to replace them we decided to try to make 12v powered chargers to make use of the excess PV power we now have during the daytime to charge the iPads and other....
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Choosing the right DC motor is critical when building mobile robots. Testing DC motors is an easy process and can be done by building a simple DC motor circuit. All that is required to build this circuit is a DC motor, a battery power source of at least 3 V,....
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This low cost water level controller circuit when built and installed will very efficiently control the level of water inside any water tank to which it s attached. Thus it can help in saving electricity and water, as well as relieving you from the headache....
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Did you know you can build your own home intercom? Read our instructions and find a circuit of a versatile home intercom system. The unit is able to communicate to as many as ten different locations or rooms discretely and incorporates a single change over....
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Certain circumstances and areas demand detection and securing of the entrances paths through alarm systems, so that the whenever an individual opens the entrance door the situation is instantly tracked by ringing an alarm. Battery operated window and door....
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A very simple to build smoke detector circuit has been discussed here through a schematic diagram, which can be easily built and installed over an area for the necessary detection purposes. The circuit incorporates the versatile FIGARO TGS 813 gas sensor as....
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