New Circuits Page 58
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An illustration of the electronic impedances of a solid-state nanopore chip. (b) Simplified circuit schematic of the voltage-clamp current preamplifier. (c) Circuit design of the low-noise current source that substitutes for a feedback resistance (RF). (d)....
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To make LED works, you need a voltage source that is higher than the LED`s forward bias voltage, and it`s higher that 1.5V (around 2V for red LEDs)....
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This sensitive touch potentiometer is based on IC1 (CA3130), one operational amplifier with a high input impedance. When the finger touches Se1 sensor, C2....
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Using the UPC1651 FM monolithic circuit can be designed a very simple low cost FM transmitter electronic project. This UPC1651 FM transmitter circuit is specially designed as a wide band amplifier covering the HF band trough UHF band. Audio signal from the....
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Current handling capability of a power supply system often needed to be checked. Finding high power rated variable resistor to provide variable load testing...
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The last installment in this series ( LEDs 102 - Use On Board Trains ) ended with a few thoughts about turning battery powered LEDs on and off. In this article I would like to explore several options for turning LEDs, and other things on your railroad, on....
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This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves (adjusting A0 and A1 pins see datasheet on if you want other....
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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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I have been getting a lot of emails about this project. Most of them are because of the bad source code listing at the end of the author`s notes. I have seen this problem all over the web and I too have ran into the same problem when compiling the code. I am....
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An oscillator-only transmitter sounds like the simplest possible means of getting on the radio air ”until you consider the challenges it presents as part of the system that is a transmitting and receiving station: The problem of an adequate....
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This is an application project that uses software W5100 library for network connections, DS1307 for displaying time, software MAX7219 for displaying on 7-segment digits. This project displays a web page where you read the time and change the 7-segment....
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A Practical Application for Cyclone V FPGA Power Requirements The integration of multiple power modules on a single power board allows for specific load requirements to be....
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Jim took the original EMT 140 design and improved it by using a plate material with a brighter sound, adding modern electronics and higher gain pickups, and providing a substantial discount on the inflated price that plagued the German EMT units. After....
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Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
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Amblone stands for AmbiLight Clone, and it is a Do It Yourself solution for imitating the Philips AmbiLight system...
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This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and property. Essentially, when the beam gets interrupted by a person, animal or object, the resistance of a photodiode will....
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U1 is a 3817 integrated circuit, which is produced by Fairchild Corp. It can directly drive the display, and it can display for 12h or 24h, It can generate the clock sound and turn on the radios on time. The display is a FND500 LED, the input frequency can....
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A two-circuit tuner, as the loose coupler, is one of the only ways selectivity can be accomplished without sacrificing sensitivity. Let`s look at the circuit, see figure #8: The signal is introduced to the primary antenna section via SW-1 arrangement, in....
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You can start to set your Square Wave Generator up using 555 timer IC through the circuit shown above. Find it match with the pinout of 555 timer IC. The osciloscope is then connected to the output of 555 timer IC in order to view the square wave. From the....
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I have designed the attached circuit for detecting how long an ultrasonic pulse need to to travel a distance. the input signal is going to be from a 40 k ultrasonic receiver. First stage is 40k Band pass - 1k pass band - differential MFB filter with a gain....
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A control program usually requires more than turning outputs on and off. They switch on and off because an event has happened. This event is then connected to the input of the microcontroller to "tell" it what to do next. The input could be derived from a....
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Description: designed to the provide information regarding the vehicles wiring content the Toyota Tercel 1996. Component: intake air temperature sensor, ....
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An inexpensive electronic instrument useful in demonstrating electrostatic phenomena. First, Ahern`s instrument can be employed as an inexpensive and effective substitute for the tonal electrostatic voltmeter. Second, the instrument provides....
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The hall effect sensor we will use in this circuit is an A1302 hall effect sensor manufactured by Allegro. This IC can detect magnetic fields. We will then connect this IC to an arduino, so that we the arduino can read the voltage output by the A1302 and we....
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VOX is a voice controlled switch, used often for microphones replacing the classic switching button. The actuating threshold is set thru the volume potenti....
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This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I`ve added a timed Siren cut-off and automatic Reset. I`ve also replaced the LED with an entry Buzzer. These enhancements....
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The magnetic field built up in the ballast collapses quickly, producing a high voltage across the tube and causing the internal gas to conduct. It`s a bit like slowly blowing up a balloon and sticking a pin in it...
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This is a circuit of FETVM-FET Volmeter. The function of the VTVM is replaced by the FTEVM while at the same time ridding the usual line cord instrument. This....
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A PIC16x84 processor may be used to generate a PSK31 or FSK31 signal. This could be used for beacon transmissions (as described here) or they may be used for telemetry, experimental, or even QSOs - the latter being true if you are willing to put up with a....
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The supply voltage is 5V and I am seeking to increase it to 12V with a load current of 1A, or an output power of 12W. I selected a switching frequency of 20kHz. By my math, I need a duty cycle of 0. 583 to do this, so the on time should be 29. 15 µs.....
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Before you begin a project like this remember: mains voltage is dangerous so if you are not 100% sure of what you ’re doing consult a friend who has the skills or, don ’t do it at all ! If you own a motorcycle, a motor home, a caravan, a lawn mover, a day....
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The article "Creating a Line Follower Robot with AVR [Censorship]" is a continuation of Line Follower Robot article with a new AVR ATMega8535 samapai phase Li..
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This circuitry zooms in magnification of 1200000 times, the bandwidth is 0.5~14 Mhzs, the input impedance is 700 ?, the output impedance is 35 ?(to measure in the 5 MHZ), the output level of noise is 0.6~0.8 V. In the chart, T1 and T2 are direct coupling....
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Electric guitars use coils (guitarists call them pickups or elements) to convert the vibrations of the strings into an electrical signal. Usually, a guitar has more than one element builtin, so that the musician can select with a switch which element or....
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The circuit in Figure 1 is that of a 4-bit asynchronous counter, also known as a `ripple counter`. It consists of 4 J-K flip-flops whose J and K inputs are tied to logic `1`. This connection causes the output of each J-K flip-flop to toggle every time it....
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DTMF Based Robo Car Design using 8051 Microcontroller Project. This project presents a method to control a domestic system using the DTMF tone generated by transmitting telephone instrument when the user pushes the keypad buttons of the mobile phone....
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LM 386 Audio Amplifier LM386 is one of the earliest audio ICs but is still going strong. It works with a few external components and is indispensable for general hobby circui....
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It`s a very useful circuit which when installed on your car gives the voltage of you car battery in a LED dot display form. The meter circuit is based on four comparators made of quad op amp LM324. The inverting inputs of IC are kept at at reference voltages....
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This dice digital circuit would be a favorite of everyone, by using it to display the numbers. When I turn off the spin switch, it will be converted to a binary input with a diode matrix D1-D9 (1N4148 or number 1N914) and then changed to a 7 segment display....
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An Astable Circuit has no stable state - hence the name "astable". The output continually switches state between high and low without without any intervention from the user, called a `square` wave. This type of circuit could be used to give a mechanism....
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Using TDA2003 audio amplifier integrated circuit can be designed a very simple 10 watts power audio amplifier on a 2 ohms load or 4 watts on a 4 ohms load. The TDA2003 device provides a high output current capability (up to 3. 5A) very low harmonic and....
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A line follower robot, or a LFR in short, is a simple autonomous robot that optically tracks a line made on the surface of the floor. That means you have an arbitrary line drawn on the floor and the robot tracks it by moving right along it! The line is....
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The following alarm circuit is designed with features which maybe suited for residential and commercial alarm system applications. It has 12V and 1. 5A regulated power supply. Furthermore, this residential alarm circuit also features such delay circuit,....
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Here is the LM383 schematic for an 8 watt audio amplifier. Very easy to build a mini-audio power amplifier. Part Total Qty. Substitutions C1 1 10uf Electrolytic Capacitor C2 1 470uf Electrolytic Capacitor C3 1 0.1uF Disc Capacit....
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Generate the 10-Hz waveform that modulates the 3-kHz tone that is generated by U1C and D, Ql drives the transducer through a 8-Q:l-kS2 transformer. R4 might require slight changes (G‚ ±1 KOhm) to optimize sound intensity. Warning: Could cause hearing loss if....
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Below we will provide you with useful article information to produce your own specific oscillator or pulse generator from integrated circuits (ICs), resistors, and capacitors using no matter the version of the 555 IC..
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As suggested before, it is beneficial to be able to adjust the gain of the amplifier circuit without having to change more than one resistor value, as is necessary with the previous design of differential amplifier. The so-called instrumentation builds on....
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PARTS LIST C1 0. 22 µF (224) C2 22nF (223) C3 10nF (103) C4 27pF C5 22pF C6 3. 3nF (332) C7 180pF (181) C8 330pF (331) C9 3. 3nF (332) C10 150pF (151) C11 82pF C12 68pF C13 220pF (221) C14 100nF (104) C15 330pF (331) C16 220pF (221) C17 1. 5nF (152) C18....
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The circuit is designed to run off a 100k volume pot, and be either a line stage or a headphone amplifier. It is a standard non-inverting gain stage (A=15dB) followed by discrete copy of the old LH0002 buffer IC. The basic idea is that the four transistors....
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Audiostrobe glasses are used in conjunction with light and sound machines, as well as some brainwave entrainment software. The glasses have LEDs buil....
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Circuit LA3600 5 Band equalizer Circuit schematics Circuit Electronics, One type of regulator of tone / tone controls are the audio Graphic Equalizer. audio Graphic equalizer have 2 kinds in my opinion. Namely audio Graphic equalizer Bar a....
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This circuit is a complete application is 2. 1 amp, two satellite speakers for TDA and one for the subwoofer, making the 2. 1 system, widely used in commercial applications as an amplifier for computers, which may give an increased in its audio system with a....
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L200 Power Supply Regulator There are applications in which it is important for the supply voltage to be largely independent of the level of the....
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Consider a simplified circuit of a typical relay as shown in the Fig. 1 usually the relay circuit is a three phase circuit and the contact circuit of relays is very much complicated. The Fig. 1 shows a single phase simplified circuit to explain the basic....
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Another cause of voltage drift is the input current of IC1, which slowly charges capacitor C1, this can especially be seen when the output voltage is about 0 Volt...
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This bi-stable circuit uses an op-amp, acts similar with RS flip-flop. Bi-stable circuit is a circuit with two stable states, low and remain low until set is....
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This circuit is design, in order to is heard the voice above the music. Useful for DJ, for small radio stations, for statements above the music, in shops etc. Also we can him use in applications that we want to handle some unit with our voice. As it has the....
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This line provides ground to that relay and is N-O when CU is OFF, and is N-C for all other control functions. The Off switch on the CU is "sticky" as I mentioned before. Several questions: 1) Can I substitute AC Delco CU p/n 15-71886 or p/n 15-71932 for p/n....
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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 expl...
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This transmitter is basic but allows transmission of audio to an AM radio. It consists of an RF oscillator operating in the AM broadcast band, together with a modulator stage, which mixes the incoming audio and the RF ..
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A speed closed loop control of DC motor using back emf sensing. Running a DC motor in one direction, just replace the LED with DC motor and remove the current limit resistor. Please note that motordirection reversal is not possible with this configuration.....
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you could apply a step sequence that only triggers every other step, then, make the steps that do trigger, rise with each activation. From there you could apply that LFO to other parameters of the plugin to spice up the sound. (I. e. you could apply it to....
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This circuit uses12V DC instead od mains AC. This is very good idea if you don`t want to mess with direct mains voltage connected circuit or you want to run the stroboscope from batteries. Flash Slave Trigger : Flash slaves are used when you need to....
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The schematic diagram shown in Figure 1 have the ability to synthesize a sinusoidal waveform with a frequency of 0. 01 Hz to 1 MHz. The clock signal feeds to the input of the binary counter IC1, this clock frequency is 32 times more than the output....
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Build a small battery powered device containing a servo. I would like to be able to turn off the servo to save battery life. I have read previously that MOSFETs can be used to do this, but I am having trouble finding example circuits that are detailed enough....
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This touch sensor switch can is designed using inverters (N1, N2)and some common electronic components. In standby state at the entrances of N1 there is a signal produced by oscillator N3/N4. At the touch sensor hand capacity forms a bridge to the ground for....
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Flashes a LED when detecting an incoming call, Powered by one 1.5V cell This circuit was designed to detect when a call is incoming in a cellular phone (e....
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The current task is to design the schematic layout, design the PCB layout, and generate the. contractor with RF schematic design and PCB layout experience Please review the block diagram in the attached. antenna will be connected to the RFOUT coax and an RF....
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This little project arose from a desire to experiment with some of the more "traditional" methods of radioconstruction which enjoyed popularity some 70 years ago. I wanted to find out for myself what kind of performance could be achieved using simple....
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Diode, D13, provides different timings for the forward sweep, and the retrace which can be faster than the forward sweep. Outputs are generated to tell the blanking circuit when to blank the CRT and when to unblank the CRT. The sync trigger input provides....
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IC1 is a 555 timer in astable mode, sending approx. 10 ms pulses to decade counter IC2. IC2 is continually reset through R3, until pin 15 is taken low through the "Fire" button. IC2 then sequences through outputs Q1 to Q7, to feed power transistors TR1 to....
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The mixer features two stereo phono inputs and two stereo line-level inputs and has one stereo mixing channel. A microphone input and a stereo main output with adjustable gain are also provided. General Circuit diagram : all passive circuitry (controls,....
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The TDA7021T integrated radio Receiver circuit is for portable radios, stereo as well as mono, where a minimum of periphery is important in terms of small dimensions and low cost. It is fully compatib....
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This Instructible is entered in the Category: 13 - 18 of the National Robotics Week Robot Contest...
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Converting periodic waveforms to square waves is an integral part of extracting a clock signal from data, creating waveform generators, and making timing-pulse generators. Any square-wave-conversion circuit is more valuable when the square wave`s duty cycle....
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the circuit diagram of an AM transmitter circuit based on three transistors. With correct tuning and a matching antenna, the transmitter can ....
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The analog to digital sketches have been covered a million ways from Sunday with every conceivable part but in order for us to move on to more complex circuits and concepts I need to be sure you know these simpler ones. This tutorial wont be quite as in....
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A very simple 16 volt switching power supply electronic circuit can be constructed using this circuit diagram that is based on the MAX668 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controller that is designed for a wide range of....
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The following circuit shows about Honda CB750 Electrical Circuit Diagram. Features: turn signal relay, oil pressure switch, neutral switch, ....
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The opamp Wien-bridge oscillator provides a nice view into classic oscillator design using feedback analysis. Feedback analysis reveals if your circuit is stable (well behaved) or unstable (may oscillate). When designing amplifiers (especially high-speed....
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None of those devices is very suitable. The drivers aren`t specified to operate with 3.3V gate signals, and although the typical graph shows that a....
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Using circuit depicted in the schematic diagram below, the direction and shaft rotation of stepper motor can be seen on the LED display. Alternative to digital rotation encoder as a digital encoder input, this circuit uses a stepper motor. Here is the....
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This first DRSSTC of mine evolved from the ISSTC work I had been doing at the time. Talking with Jimmy Hynes, who built the first DRSSTC, I decided I would give it a try, though with some changes from his design. Jimmy`s DRSSTC used an oscillator to generate....
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For proper operation, circuit ground must be connected via a small value, high voltage-rating capacitor to one side of the mains supply socket. The "Live" side is the right one. The purpose of this circuit is to animate shop-windows by means of a capacitive....
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Although a simple crystal oscillator may be built from one comparator of an LT1720/LT1721, this will suffer from a number of inherent shortcomings and design problems. Although the LT1720/LT1721 will give the correct logic output when one input is outside....