Popular Circuits Page 47
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Please find attached your copy of my four foot unampilfied box loop. It will
tune from 525 kHz to about 1710 kHz covering the entire Broadcast Band.
The umbrella stand described in the article is the type you would use for an
outdoor umbrella. I fill....
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The principle of operation is quite simple, a counter measures the VFO frequency, the new
reading is compared with the previously stored value and an adequate correction is applied
consequently. This process has been implemented in the past using several....
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On the initial part of the positive half cycle, the voltage is changing rapidly from zero causing a large current to flow into capacitor C2. The current through C2 flows through R4, D3, and D4 into the gate of the TRIAC Q2 causing it to turn on very close to....
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This Sensor circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm. , D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted....
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This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker Used as a sound effect generator it can be connected to external amplifiers, tape....
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A regulator allows you to power a 7.5-V cassette recorder or other device from a 12-Vdc au..
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A practical realization of a spread-spectrum technique lowers a µP`s clock-related EMI by approximately 4 dB without the drawbacks associated with modulation (Figure 1). The spread-spectrum technique is a popular method to reduce µP-clock-related EMI....
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Here is an interesting circuit for a magnetic proximity switch which can be used in various applications. The magnetic proximity switch circuit, in principle, consists of a reed switch at its heart. When a magnet is brought in the vicinity of the sensor....
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As shown by INA331/332 configured to directly drive the capacitive input A/D converter shown in Fig. Since INA331/332 output is low resistance, and therefore work at high frequ..
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A collection of drawings of different 555 applications. Some are drawings of schematics found on the web and in books, and saved for my own reference. I did not save the web pages that these originated from, so some may not have proper attribution. If you....
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Single Transistor Amplifier Revisited Part 3, Common Base vs Common Emitter Configuration, Update One nagging question that I have long had is this: How do....
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A monolithic 555-type timer is the heart of this simple automobile voltage regulator. When the timer is off so that its output at pin 3 is low, the power Darlington transistor pair is off. If battery voltage becomes too low, less than 14.4 V in this case,....
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The original FLED-based SE uses a flashing LED to drive a type 1 solar engine (you`ll note that it`s just like the Zener-based SE, but with a FLED in the starring role). The good news is that all the parts in this solar engine are relatively easy to find;....
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Our car radio has the annoying habit of forgetting what part of a CD it was playing when you turn it off. On long drives this is a real drag; I`ll leave an audio book playing for my family in the car while I gas up, and when I turn the key from Accessory to....
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Duty Cycle Selector is unique project to select duty cycle in 9 steps up 100% circuit diagram with description of duty cycle selector various digital circuit...
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The original coil that came with the Heathkit project was preassembled at the factory. It had a diameter of around 15cm (6 inch). A larger (30cm, 12inch) coil can be made using the following data:..
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This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn`t add much in....
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This filter is used to reject or block a frequency or band of frequencies. These filters are often designed into audio and instrumentation systems to eliminate a single frequency, such as 60Hz. Commercial grade components with 5%-10% tolerance produce a....
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The antenna amplifier circuit has a part count of about 40, using the following active parts: 2 NPN transistors (BC548`s), 1 MOSFET (BF981), 2 Varicap diodes (KV1235), as well as a 6v2 zener-diode. there is and a 330uH (micro Henry) inductor / coil, which....
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Numitrons are neat display devices similar to Nixie tubes, but they were designed for low voltage use. Numitrons are basically incandescent displays, using filaments for the segments. Basically, a seven-segment readout consists of seven narrow illuminated....
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The 15v zener is fed via the 4K7 resistor from the input. With 0.6v across the base - emitter of the PNP transistor, this establishes a voltage of 14.4 across the 3K3, so there must be a current of nearly 4.4mA through the 3K3. This current is available to....
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A 2002 blazer and I ran the codes on it and it came up po 155 and po 756 which a 02 sensor heater circuit malfunction and ashift solenoid b ckt performance of stuck off. What is that and what will it cause. The blazer has power when it first starts then when....
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Simple construction, reliable operation, very small power consumption, and, most of all, small size. I started with CMOS logic gates, but was soon forced to abandon the concept after a few unsuccessful (and far too complicated) attempts. Then I suddenly....
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rDA2030A TDA2030 is improved product that the original maximum working voltage up to 18V 2ZV, the maximum output power up to 18W. Harmonic distortion is also greatly reduced. Its application circuit is shown..
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Found some more photos of the cutter parts: This shows the conical inserts to the quick change nozzle to reduce contamination of the stream on the cut. The one....
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The code in mikroC PRO for PIC16F887, with 8. 0000 MHz clock for microchip 44 pin Demo board, the routines have been written from microchip in HITECH C, since I am working and have programmer and software from mikroE I am interested to go with that only,....
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IC1, an Intersil ICL7106, contains an a/d converter, a 3 1/2-digit LCD driver, a clock, a voltage refer-ence, seven segment decoders, and display drivers. A similar part, the ICL7107, can be used to drive seven segment LEDs. The probe body is a five-inch....
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The YN-460 is a very low cost manual-mode-only shoe mount flash made by a Chinese company Yongnuo. It has become very popular in the strobist community due mostly to its low cost and good performance. In order to change flash power level, the user is....
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This system is a control system based on one-chip computer, control the system light in remote-operated way. This scheme mainly solves transmission and receiving of the signal, the program manipulation to different signals after the the signal one is dealt....
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The following circuit shows about AD854 IC For load Cell Amplifier Circuit Diagram. Features: 6V Gel Cell Battery Charger, 5V Regulated Solar Cell ....
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The HT70XX series is a set of three-terminal low power Voltage Detectors implemented in CMOS technology. Each Voltage Detector in the series detects a particular fixed voltage ranging from 2. 2V to 7V. The Voltage Detectors consist of a high-precision and....
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The circuit"s input op amp triggers the timer, sets its flip-flop and cuts off its discharge transistor so that capacitor C can charge. When capacitor voltage reaches the timer"s control voltage of 0.33 Vee. the flip-flop resets and the transistor....
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MAX2659 low-noise amplifier (LNA) is designed for GPS, Galileo, and GLONASS applications. Designed in Maxim`s advanced SiGe process, the device achieves a 20. 5dB gain and an ultra-low-noise figure of 0. 8dB while maximizing the input-referred 1dB....
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TR-55 was the first transistor radio produced and sold in Japan. It uses the following transistors: 2T51 (oscillator-mixer), 2 x 2T52 (for IF), 2T53 (AF driver) and 2T12. The very first commercially produced transistor radio was Regency TR-1 from October....
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The heart of the circuit is an IC4822 named as IC1. IC4822 is a programmed ROM, which generates 16 musical tunes when it gets triggered. The main feature of this IC is that it has inbuilt tone generator, rhythm generator, modulator, oscillator, frequency....
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This project is useful if you wish to experiment with absolute phase, or are just interested in the possibilities of a polarity reversal circuit. In the case of absolute phase, many studies have shown that there can be an audible difference between....
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This circuit will allow a multimeter to display the positive or negative peaks of an incoming signal. A 741, JC1, is used in the noninverting mode with R1 defining the input impedance. D1 or D2 will conduct on a positive or negative peak, charging C2 until....
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Up to six lights can be sequentially flashed using this circuit. LED1 through LED6 can be replaced by optocouplers (MOC3010..
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Personal Alarm Circuit Diagram. If you feel threatened or need an urgent support in a crowd, use this alarm to catch the attention of others ..
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LTC6101 op-amp can be used to build High voltage current monitoring/sensing. This circuit can senses current in 500 volts system. Here is the schematic diagram....
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This device has been designed as an example application of an expandable system of modules for building mobile robots following the standards set out in the discussion on the Society Of Robots forum. These modules can be connected to each other using an i2c....
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Two IC rf modulators convert a suitable baseband video and audio signal up to a low VHF modulated carrier-Channel2 through 6 in the U.S., and 1 through 3 in japan-the LM1889 and the LM2889. Both !Cs are identical regarding the rf modulation function,....
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This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....
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In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a....
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We can do a step-up conversion without using transformer. Using this circuit, a 5V DC source can be converted into 15V. Please note that there is no power gain....
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Sensing circuit detects either steady or fluctuating air flows. The heart of the circuit is a Radio Shack piezo buzzer (P/N 273-060) and an LM324 quad op amp. (Red wire from the piezo element connects to capacitor CI, and the black wire to ground) When a....
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Here is countdowntimer24 second circuit. Thistimercircuit build for automatis on or off electronic load. Thetimercircuits uses fast 74LS schottky IC`s. A 24 second countdown starts when S3 is off and S2 is pressed. Switch S3 is used to start/pause the....
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Many low pass filter circuits for subwoofer seem to be given And this is also just Another one. The circuit given here is Depending about the opamp TL062 from one ST Micro electronics. TL062 is really a dual high input impedance J-FET opamp And this has....
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(This circuit first appeared in "The Braille Technical Press", edited by Robert W. Gunderson, in 1955. Gunderson, W2JIO, designed this "gimmick" to read transmitter meters. It appeared many times since over a 20-year period, included even in commercial aids....
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A speaker/microphone/transmit button circuit for the puxing 777 which probably works for all puxing radios. I decided to reverse-engineering an earphone/microphone headset that came with the radio to determine how it worked. I can`t claim that I`m an expert....
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The unijunction transistor (UJT) is made of a bar of N type material with a P type junction (the emitter) near the centre. Base 1 is connected to zero volts and base 2 to the positive supply. The resistance between the two bases (the INTERBASE RESISTANCE) is....
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This pre-amplifier can be drived directly from the DAC. ..
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Circuit works: When the gas sensor MQK-2 surface adsorption or smoke when combustible gas, which inter-electrode resistance BL plummeted, this time by the Rp2, R1 and BL electric poles between resistance partial pressure node C potential drop, when it fell....
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Microchip Technology`s MCP73113, MCP73114 and MCP73213 Lithium-Ion (Li-Ion); and MCP73123, MCP73223 Lithium Iron Phosphate (LiFePO4) Chargers feature Overvoltage Protection (OVP), which prevents overheating and damage to the battery-charger circuit from....
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A mute-switch for the Etherwave that adds a "mute status" light which doubles as a power-on light. Here`s the schematic. Don`t forget to browse the rest of Art`s great site!..
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Five pins RA0 to RA4 are used as inputs. The pins are connected to the 5V average resistance 10K (Pull-up). So when no switch is not depressed all the pins have a high potential (HI +5 V). When one of them is pressed then the foot is connected to get a low....
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The 12 Volt power in my application comes from a small solar power system, it may also be provided by a suitable wall-wart DC power supply. The cistern is located below the toilet tank, the pump moves the water up to the toilet`s tank. The pump is switched....
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Build a logic level shifter (that`s what it`s called) with a few discrete components (transistors and resistors) or you can go for a one-component solution, i. e. an IC. Most ICs won`t accept input voltages as low as 1. 4 V, but I found Fairchild`s FXLP34....
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The FlexiForce sensor acts as a force sensing resistor in an electrical circuit. When the force sensor is unloaded, its resistance is very high. When a force is applied to the sensor, this resistance decreases. The resistance can be read by connecting a....
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This fixed frequency triangular waveform generator driven by a TTL square wave generates typically 16-V p-p triangles at frequencies up to several MHz. It uses only one AND open collector gate, or one open collector inverter as a fast integrator with gain.....
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An ordinary automatic room power control circuit has only one light sensor. So when a person enters the room it gets one pulse and the lights come on. When the person goes out it gets another pulse and the lights go off. But what happens when two persons....
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The selection is made with ceramic filters. This 27 MHz receiver works with an intermediary frequency of 455 kHz...
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This is my conceptual schema to use a PIC12 to control the blinking of 3 LEDs with different blinking patterns. I have a few questions that would like to ask...
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Clap operated Remote Control for Fans in this website is used control ten-step speed of fan circuit diagram and description of Clap operated Remote Control for Fans...
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Hi everyone, I`ve been looking at the ""proper"" voltages for charging, and especially at this....
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Looking for an efficient USB charger that can operate from a 12V car battery? This unit functions at up to 89% efficiency and can charge USB devices at cu....
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The following data and mapping are for the 2-D shift mapping algorithm that the controller will use to determine when and if to shift. The solid lines on the graph represent up-shift boundaries, and the dashed lines represent down-shift boundaries. This data....
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A simple little three-transistor FM wireless microphone / room bug that can really throw-out quite a signal. With a wide tuning range from 80 MHz to 120 MHz, this little device can transmit anywhere within the FM broadcast band (88 to 108 MHz) and can be....
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This project shows how to build a simple LED light string display using seven 24V LED light strings. I built this project for Christmas 2009 in order to decorate my balcony with lights. The light strings used are very common and (at least in Sweden) can be....
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The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2, C3 C4, C5 and inductors L3, L4 forms a UHF band pass filter. The input signal is fed to the emitter....
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A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will....
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A robot that dances to music. G‚ Wouldn`t it be wicked cool to have a cute little robot on your desk dancing to Fatboy Slim Winamp provides a nice API for writing music visualization plug-ins. G‚ I wrote a plug-in that sends signals to the parallelport that....
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A RF spectrum analyzer is one of the most useful tools an experimenter can have. The spectrum analyzer project shown here will be a slight improvement on the " Spectrum Analyzer for the Radio Amateur " ( Part 2 ) project from Wes Hayward (W7ZOI) and Terry....
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Line Follower Robot Project Using 8051 with circuit diagram is explained in this abstract. Download line follower or chaser robot full project report..
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The USB-Servo is a device to control a servo via USB. A servo is a motorized device that is commonly used in remote controlled cars and planes. I built this device to activate a toy puppet. The puppet has a button on its bottom, if you press the button the....
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For the 60W amplifier, a nominal (full load) supply of +/- 35V is required, so a 25-0-25 secondary is ideal - however, see Updates, below. The circuit for the supply is shown below, and uses separate rectifiers, capacitors and fuses for each channel. Only....
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This is a long range stable FM transmitter circuit. The circuit is using a LM2950 5V voltage regulator IC comes in TO 92 transistor package, which will provide a stable 5V to the oscillator till the 9V battery runs down to 5. 5 volts, due to which the....
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This tutorial explains how to read the content of the microcontroller `s flash memory. The source microcontroller reads the content of the memory and displays it on the LED s. The content is nothing but the program written in the memory of microcontroller.....
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Strain-gauge sensors transduce (convert) strain into an electrical signal for use in pressure sensors, weight measurements, force and torque measurements, and materials analysis. A strain gauge is simply a resistor, whose value varies with strain in....
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This circuit is useful in liquids level or proximity detection. It operates detecting the distance from the target by reflection of an infra-red beam. It can safely detect the level of a liquid in a tank without any contact with the liquid itself. The....
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As shown in the following figure is double coil metal detector circuit. The probe by the probe, a transmitter, a receiver, a timer and sound transmitters and other components. ..
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If found myself in need of a 1 KHz signal source for an experiments. My function/sweep generator was needed as a pulse generator for the same experiment, so I went though my junk box, looking for circuits from long ago that might fill the need, but found....
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The battery life and operating cost of an electric vehicle is severely affected by overdischarge of the battery. This circuit provides both warning and shutdown. An electronic switch is placed in series with the propulsion motor contactor coil. Three modes....
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The circuit provides a simple and cost-effective solution to matching resistors and capacitors. Impedances ZR and Zx form a half-bridge, while OSC and OSC excite the bridge differentially. The external op amp is a FET input amplifier (LF356) with very low....
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The 650 MHz Prescaler Probe's input is terminated by resistor Rl and is fed through Cl to the diode limiter composed ofD1 through D4. Those diodes are forward-biased by the +5 volt supply for small-input signals and, in turn, feed the signal to Ul. However,....
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Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may have treasures in your collection that you would like to burn on CDs. First, preserving a CD is....
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Here is a very simple triac tester circuit which can be used for testing of SCRs as well as triacs. The circuit could even be used for checking of pnp and npn transistors. The circuit works on 3V DC, derived using a zener diode in conjunction with a....
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LVDS receiver needs a failsafe function to avoid uncertain output state when it has an improper connection. In this appnote, we examine the circuits and characteristics of three popular failsafe functions: external-biasing, in-path, and parallel....
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Digital visitor counter is a reliable circuit that takes over the task of counting Number of Persons/ Visitors in the Room very Accurately. When somebody enters into the Room then the Counter is Incremented by one and when any one leaves the room then the....
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Arduino Uno has a ATMEGA328P-PU microcontroller, and bunch of other stuff on the board. I`d like to program the chip without the Arduino software, and only the minimum of other components. I want to eventually create things without the cost of Arduino, and I....
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The OPB350 series liquid Sensor is designed to work with 1/16 [1. 6mm] 1/8 [3. 2mm], 3/16 [4. 8 mm] and 1/4 [6. 3 mm] outside diameter clear tubes. When output reference circuitry is added, multiple output states such as fluid present, no fluid present and....
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Powerful for its size and cost, and extemely easy to learn and use. I spend a fair amount of time zipping around townon my scooter, and thought it would be cool to add a voltage monitor to warn when the battery might need recharging. Waiting until the....
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The Infrared IR Receiver circuit is not particularly unique. The main components are the phototransistor, the microcontroler and the amplifier. If you can understand how these three devices transfer data, then you should have no problem getting the circuit....