Popular Circuits Page 242
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This circuit will be particularly useful to those hobbyists who use a breadboard` to try out ideas and who also use a simple home-made` DC power supply consisting of a transformer, rectifier, smoothing capacitor and protective fuse, that is, one without over....
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This device just sends data about the state of our office to Twitter (mainly because it`s just slightly more relevant than sending the same information about my house). It does however have potential relevance to more biodiversity themed activities,....
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This is the schematic of a simple jfet buffer from the Basic Buffers article in the AMZ Lab Notebook, with the addition of pulldown resistors at the input and output. The circuit has a high input impedance and a low output impedance suitable for driving long....
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Circuit as shown, with a touch of a finger when the metal sheet S, N neon tube light, since N and photoresistor RG constitute optocouplers make RG resistance becomes smaller, s..
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The piezo effect works both ways: if you apply a voltage the piezo stretches, but also if it stretches it creates a voltage. This principle is used to create a feedback signal which drives the oscillator. The advantage of the self drive is that it will....
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The antenna used for either receiving or transmitting is a vital element in the communication link. In most cases the antenna has a great deal to do with how well the receiver or transmitter works. Antennas are reciprocal, meaning that an antenna designed....
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Using LM231/331 chip, we can build a low-cost voltage-to-frequency converter, ideal for analog-to-digital conversion, frequency-to-voltage conversion, long-term...
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The sensors are a thin strip of piezoelectric material with a rivet in the end acting as a weight. When there is a vibration, the weight moves, stressing the piezo material that produces a spike in voltage. This voltage that is created may be up to 90V. We....
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This circuit use the CA3306 a family of CMOS parallel (flash) analogue to digital converters designed for low power, high speed applications. The CA3306CE operates at sampling rates up to 10 million samples per second and the CA3306E up to 15 million samples....
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The automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to an overhead tank (refer Fig. 1). It automatically switches on the pump when the water level in the tank falls....
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Amplifier circuit shown in Figure 2-25. It has the following features: (1) promote the use of a class 6N11 tube for parallel push-pull amplification entire term, high-frequency..
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Vinyl equalisation (EQ) has been with us in a stable and predictable form for quite a long time, but for those who are interested in the old 78 rpm records there are a great many problems to overcome. One of these is obtaining a turntable that runs at 78....
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Total electric current drawing of the circuit, recommended measured by inserting the probes of an multimeter across the positive output with the power supply and also the positive rail input with the amplifier, should be 700mA. Adjust R8 to obtain this value....
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As shown, the OPA277 constitute inverting amplifier, inverting amplifier use high input impedance characteristics can be reduced and the loop thermocouple offset drift. 50 pote..
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These accessories are low cost, aerial speed, bifold JFET ascribe operational amplifiers with an internally akin ascribe account voltage (BI-FET II technology). They crave low accumulation accepted yet advance a ample accretion bandage amplitude artefact and....
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This is a power amplifier circuit which built using a TDA2002 power amplifier IC module. These are replacements for the original LM383 which is no longer available. It is easy to build and has a minimum of external components. The module has both short....
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Application Notes, Resolvers as Velocity and Position Encoding Devices, Potentiometer, Incremental encoder, Absolute encoder, Resolver, Inductosyn...
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This circuit gives sound handful that modifies interestedly, occurrence sound rate cricket Fixed. By R3 should experience change the value C1,R5 and C2....
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My modification, i have two trigger coils , two power coils, one reed switch. The wheel is 4 north pole magnet, it generates 9 radiant pulses per....
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This is Electronic Siren circuit diagram. The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is presse....
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The circuit shown here can be used to control the speed and direction of rotation of a series-wound dc motor. Silicon controlled rectifiers Q1-Q4, which are connected in a bridge arrangement, are triggered in diagonal pairs. Which pair is turned on is....
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Circuit principle : the oxygen sensor circuit by the OS-12, DC amplifier IC1, A/D converter IC4, a liquid crystal display F2100-34PI, the voltage comparator IC2, the positive a..
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A high-frequency audio signal (15 to 25 kHz) generated by Ul is fed to buffer Ql and SPKR1. A portion is f..
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Any mode (e. g. CW, AM, SSB, FSK) which is initiated in the HF transmitter or transceiver can be regenerated at LF (100 to 200 kHz) using this simple converter. The output at LF can be used to drive an LF Power Amplifier. The February, 2000 issue of Amateur....
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As we all know, if the elevator power suddenly fails, the distance distribution room duty officer is not immediately found, this time, the crew was on the elevator might panic...
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The circuit can drive the companys Dialight 745-0005 monitor, which is a word composed of 64 alphanumeric display, generating 0 seconds and 1 second input lines A1-A6 on the phase response of the desired characters. 7 transverse matrix continuous scanning..
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This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short `fruity` pulses. The type of sound produced is very easy to hear and to determine the precise direction it....
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Usually when the car door is closed, the dome light just goes OFF. With this circuit, you can have our dome light fade slowly in brightness and finally go OFF. Electronic Transformer Dims halogen Lamp : 05/11/00 EDN-Design Ideas / (several circuits in PDF)....
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Listen and share your music wherever you go With the mini speaker system project, you can listen to music whenever you want: your dorm, your cubicle, or at the beach. This is a great introduction to circuit systems, featuring an introductory amplifier....
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The following circuit shows about AD8531 IC For LCD Panel Backlight Automatic Control Circuit. Features: can compensate for aging effects and the ....
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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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Detailing the design and build of a 60khz time code receiver and clock. From PIC programmer to LED clock display....
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This simple circuit tests speakers, microphones, transformers and voltage. It`s basically a very low frequency oscillator that produces extremely short `fruity` pulses. The type of sound produced is very easy to hear and to determine the precise direction it....
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This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few centimeters from the cellular phone, so its sensor coil L1....
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I got oscillation issueon THS4271. The circuit schematic is as attached. The input is differential sine wave on positive and negative terminals with 10k differential resistor. The output oscillates at 300Mhz or mixed frequency as attached. Once turn off the....
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The electronic circuit birds under different lighting, especially in the vagaries of the neon light irradiation, can be issued fluctuated, changing tone sound of birds, the sound is constantly changing. Its circuit is shown...
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This is an IR transmitting circuit which can be used in many projects (I designed this to try to make my 3D glasses wireless). This IR transmitter sends 40 kHz (frequency can be adjusted using R2) carrier under computer control (computer can turn the IR....
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12V Battery Charge Nominal Discharge (Low) Indicator Circuit This circuit monitors car battery voltage. It provides an indication of nominal....
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A single pulse signal generating circuit Shown as a single pulse signal generating circuit, switch contacts such as the use of such a digital signal reset signal or the stop si..
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This article is for complete beginners with servo motors. It teaches you the servo motor basic theory and gives detailed steps to use them with AVR Microcontrollers like ATmega32....
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Fluorescent Tube Light Circuit of an inverter that uses a single transistor and a single transformer. This type inverter can be made in various....
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A very nice universal window based software designed to work with any serial programmers for PIC16F84, i. e. , WPicProg16 V1. 20. Build this programmer before start constructing the coming many interesting F84 projects. Some PIC programmers can be used for....
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This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
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These two projects , Wah and Fuzz, are the results of a modification to a Morley dual channel volume control pedal that one of my sons suggested I undertake as He had no use for the volume unit but thought I could modify the pedal into a Wah unit. I decided....
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Many educational haptic feedback devices use kinesthetic force feedback devices such as the Novint Falcon and the Phantom Omni. Although these devices are relatively cheap compared to other high end haptic feedback devices, they are still expensive for....
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There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect the Lilypad Arduino using the FTDI at the same time. The....
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Many fire alarm circuits are presented here, but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight forward so that, it can be easily implemented. The thermistor offers a low resistance at high....
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FM302E-I-type FM transmitter exciter is used in Japan NECs HPB a 1210 motherboard. Direct carrier frequency modulation, phase-locked frequency stabilization and frequency synth..
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All ATL-3 loop windings are centre tapped and balanced w. r. t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields, e. g. televisions and the electric meter box, or....
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The Clarinet preamplifier is agile, detailed, and warm without being euphonic. It has excellent soundstaging, tonal balance, presence, and palpability. It is far better than any of the other kit preamplifiers I have heard to date, and is worth your serious....
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A small transmitter board interfaces to a microcontroller and conductivity probe to measure liquid conductance and conductivity. Precise equations and measurements are provided for this microcontroller controlled conductivity meter....
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An ultralow dropout current source maintains accurate LED current at very low ILED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. The....
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Figure 3173 is a mechanical braking, dynamic braking, reverse braking function wound rotor induction motor speed can be positive and negative control circuit. Figure, KI, to st..
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Function: used to give balanced little distortion amplification and level shifting to wide bandwidth differential signals. Component: LMH6552 IC, Resistor, ....
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Figure 2-32 (a) shows the time control diagram, and the motor is operated by the switch S1. When Sl is turned to 1, the power driver circuit provides current to the motor for running; When S1 is turned to 2, the drive current is cut off, and the electric....
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This application note describes techniques of using a PC based Digital I/O Board to characterize analog-to-digital converters (ADCs). It will look at static DC parameters such as integral nonlinearity (INL), differential nonlinearity (DNL), gain, and offset....
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Moisture deposited on a surface bridges across a grid of wires or circuit board traces. A circuit measures the AC ohms resistance through the grid. - Warm wet weather promotes fungus and insect pests of plants. - Quick detection of rain can be used in....
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This circuit of power supply, are very simple in the manufacture, the finding of his materials , is very easy and cost, small. The output voltage is stabilised and is regulated in the region from 0V until + 15V dc, with biggest provided current 1 A. The....
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The IRPLCFL5E reference design is an electronic ballast for driving 26W compact fluorescent
lamps from 220VAC. The circuit provides all of the necessary functions for preheat, ignition and onstate
operation of the lamp and also includes the EMI filter and....
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The main requirement for efficient de restoration is to provide a short time-constant during the clamp period, with a long time-constantlluring the active line time. The switch within the Harris HI201HS has an on resistance of 30 0 and the PM! buffer,....
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LT1206 is suitable for driving multiple video cables since it has 60MHz bandwidth, 250mA output current capability, and low output impedance. Please keep in...
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Many tools can be used with a musical instrument to produce various sound effects and the simplest form is the repetition of tone or a method often called echo . Such equipment to create one more turn on the music that you hear. Circuit diagram is for....
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This timer is based on a simple Monostable Circuit. The length of time the relay remains energized - the ON period - is controlled by the values of R3 & C2. And the length of time the relay remains de-energized - the OFF period - is controlled by the values....
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Circuits that latch one-of-N switches usually use a digital approach. Such circuits are often useful in human-interface situations, such as audio-mixing consoles, video-feed selection, or current-loop-control redundancy systems. In high-precision analog....
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Circuit shown in Figure 3-157. The circuit can be used motor capacity of not more than llkW and require precise stopping of the occasion. Shutdown, contact KMi release, Mi and M2 motor stator winding is formed of three rectifier circuit and three short road....
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This is PWM Speed DC motor Rotation circuit. It can Forard-Reverse and Regenerative Braking function. By this circuit use a signal PWM control the speed of DC 12V motor with Power mosfet IRF150. The relay RY1 use control Reverse with the digital alarm,....
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Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparently also scares away intruders. The only problem is that free-running dogs and cats in the....
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Synchronous switching is turning on only at the instant the ac supply voltage passes through zero, and turning off only when current passes through zero. This circuit provides this function in response to either a mechanical switch or a variable resistance....
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Metal detector schematic circuit using CS209A and few electronic components..
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This display uses ten LED`s to display a voltage range from 10. 5 to 15 volts. Each LED represents a 0. 5-volt step in voltage. The heart of the circuit is the LM-3914 dot/bar display driver. Trimmer potentiometer R5 is adjusted so that 7. 5 volts is applied....
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Oscillation frequency 10Hz ~ 20MHz, 6 ranges. Analog output Sine, triangle, square wave (0 ~ 4Vp-p, Zo = 50?). TTL Output Clock (Duty: 50% fixed) positive negative pulse (variable pulse width). Operating system Show: oscillation frequency and operating mode....
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Here is a schematic of a very sensitive microphone preamp circuit, which can be used to increase gain of microphone or boost the audio signals coming from microphone. The circuit is very simple contains only few components and can be assembled in few minutes....
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The prototype of Keypad Switch No. 2 was built using only the Stripboard Layout as a guide. So - if you have faithfully reproduced that layout - you will have a working circuit. Once you`re satisfied that your layout is correct - and you have made a careful....
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The circuit disconnects the battery from the load when output voltage falls below a preset level. Cl charges through R1 and turns on Q2. Collector current flows through R2 turning Ql on and battery is connected to the load..
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AC contactor DC transformer circuit has run a variety of types, Transformer AC contactor DC operation circuit b ..
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EZRoute2000, from Bill Jenkins, is the completely re-written 32-bit version of EZRoute Pro, for all Windows platforms. Includes schematic capture, interactive symbol editor, libraries, pc board editor, 1000 shape pad table, gerber output and viewer. Free....
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Hobby Servo`s Turn DMX signals into mechanical motion. Generally hobby servo`s require a pulse having a variable width from 1 to 2 milli seconds, with 1. 5mSec as the center position. The schematic below is a simple voltage to pulse width circuit. This is a....
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The schematic diagram of 100 watt audio amplifier with MOSFET. The huge collection of electronic circuit diagrams are provided here 100W RMS Amplifier · 0-30V Stabilized Variable Power Supply with Current Control..
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Using this circuit, you can change the speed of the fan from your couch or bed. Infrared receiver module TSOP1738 is used to receive the infrared signal t....
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If your scope probes are not isolated then it's still no problem because you can connect the grounding leads of your probes to point A and the tips of your probes to points B and C. Yes, the resulting current traces will be inverted, but only if you don't....
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This Circuit have output voltage 14 volt with current maximum 4A. Can be use on nicad battery and accu, wet and dry. But the accu must be 12 Volt and have current 4A or higher. The current fillter voltage build of IC CA3140 or LM324. You can which two IC.....
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Generate sound or output analog voltages with an Arduino. This Instructable will show you how to set up a really basic digital to analog converter so....
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Many blind and deaf-blind persons use portable electronic devices to assist their everyday lives but it is difficult for them to test the batteries used in this equipment. Talking voltmeters are available but there is no equivalent usable by deaf-blind....
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Figure 4-11 is a feedback attenuator consisting of transistors tone control circuit. The circuit in addition to a conventional high, bass control system, balance control, volum..