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The car alarm here is a simple circuit with basic characteristics that cover all entrances at the car that has switches (doors etc).With one switch (arm-switch) the circuit waits for the sensor-switches to open and to activate it. So the horn with 1 sec....
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Fast charging circuit (TEA1102) Shown is a chemical for a variety of battery fast charging circuit, which is based on fast charge controller TEA1102 nuclear charging circuit of..
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Basic reference transistor bias circuit - Mixed Negative feedback ..
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Because of the power restrictions, our design options for the flippers were limited. Normally, pinball machines use linear solenoids, which at 12 V and 3 A are pathetic. On the other hand, DC, servo or stepper motors would be challenging to use. In order to....
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Hi, can anyone explain what the four transistors on the right hand side of each of McBride`s schematics are doing?....
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This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec., e.g. when accessing some dark place, without the necessity of coming back to switch-off the lights...
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It illustrates a simple boost circuit, which is supplied by an oscillating signal generated NE555 via VT transistor to drive booster transformer , a step-up transformer to increase the oscillation signal is then rectified DC high voltage can be obtained...
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As shown for the photoelectric receiver amplifier. Photo receiver amplifier for amplifying circuit amplifies the electrical signal photodiode or phototransistor optoelectronic ..
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A constant off-time control which provide a high efficiency over a wide range of output current can be used by the LT3463A dual micropower DC/DC converters with internal Schottky Diodes, as described in the following circuit diagram and the datasheet..
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LM3900 [ PDF ] OP consist of four independent and internally compensated amplifiers in DIL14 package that are designed for wide single power supply voltage. ..
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The 555 Timer shown below is configured as an 555 Astable Multivibrator previously discussed. However additional components have been added to enhance the operation of the circuit. As soon as the circuit is powered up the 555 will begin producing a square....
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Bridge rectifier circuit in the electronic ballast application circuit ..
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Circuit This circuit diagram of UPS is designed to use with a cordless telephones that cannot be operated during power failure. Since the ups is only meant for telephone, it`s output power is limiter to 1. 5W. This ups circuit is economical and can be....
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In a CCD (charge-coupled device), packets of charges shift across the array. The transistor array, also called a bucket-brigade shift register, receives drive from a dual-phase clock signal. Dual-phase clock signals comprise two synchronized clock signals....
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The length of time the circuit stays on for depends on how long it takes for the stored electrical current to leak back into the circuit, keeping the transistor (and thus the entire circuit) energized. We have a resistor that is limiting the rate at which....
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All components that used in Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F. Main component in this circuit is IC NE555, Led IR, Phototransistor L14F and IC LM1458. Moving sensor / detector schematic diagram divided into....
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If you have a digital voltmeter, or any voltmeter with millivolt resolution and high input impedance, then you can use this temperature-to-voltage adapter...
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You will find later some applications such as Basic Circuit Description, Block Diagram of the MF10, Programmable Dual Clock Generator, Butterworth Lowpass filter, MF10 as an Input Filter and Sample/Hold, Generating Quadrature Sine Waves, and the....
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This video shows you the basics of op amps and has an example circuit where you build an amplifier to take a tiny microphone signal and amplify it to be audible on earbuds. The circuit is based on the LM324 quad op amp IC...
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Circuit has a 1 Hz-to-30 MHz output, 150-dB dynamic range, for a 0 to 5 V input. It maintains 0.08% linearity over its entire 71/3 decade range with a full-scale drift of about 20 ppm/°C. To get the additional bandwidth, the fast )FET buffer drives the....
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An exclusive-OR gate, IClD, turns a simple CMOS oscillator into an FSK generator. When the data input increases, IClD inverts, and negative feedback through R2 lowers the circuit"s output frequency. A low input results in positive feedback and a higher....
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This is a UHF oscillator circuit I designed to make use of the Mini-Circuits POS-400+ voltage controlled oscillator chip. By giving it a voltage from 0 to 12V on pin 8 it gives out a sine wave ranging from 200MHz to 380MHz on pin 2, though my testing with a....
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This circuit will generate siren sound when S1 pressed and increate sound frequency becuase capacitor C1 charged when switch S1 released the frequency will decreated(C1 discharged)...
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This circuit operates a relay each time a sound of sufficient intensity is made, thus one clap of the hands will switch it one way, a second clap will revert the circuit to the original condition. Q2 and Q3 form a Schmitt trigger. The JK flip-flop isoised as....
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This the Good Quality FM transmitter for your stereo or any other amplifier gives you a pretty good signal strength up to a range of 500 metres having a power output of about 200 mW. This circuit can be operated with a 9V battery. The audio-frequency....
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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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It works perfectly on the breadboard, where I can see the LED blinking at 2 Hz. However, when I try to solder it on the perfboard, it blinks much faster. I don`t have a way to measure, but I`d say something like 10 Hz. I tried to mount three times on the....
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This circuit employs an adjustable resonant tank circuit which insures operation at the desired crystal overtone. Cl and LI form the resonant tank circuit, which with the values specified as a resonant frequency adjustable from approximately 50 MHz to 100....
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Every driver knows that a high intensity light striking one`s eyes can have dangerous consequencies. Cars have a dimmer switch to lower the light intensity but unfortunately, some auto headlamps are just too bright even if they are dimmed. The dimmer circuit....
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Model railway running under computer control using the laptop to send commands over the USB port to the Arduino, which then does PWM to control the speed of the train. There were a few hiccups along the way not least of which the Arduino crashed repeatedly....
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This circuit produces oscillating frequency around 1kHz, and able to be converted by changing the value of resistor R1. The speaker will produce a long beep sound with 1kHz frequency. Here is the schematic :..
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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As shown for the LM4910 minimum output noise/reduce the output power circuit. Reduce output noise measures are: between the output terminal of a resistor in series with the loa..
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This circuit detects spikes in voltage around 18v. It is used to detect when a battery becomes disconnected on a running motorcycle. When that happens, the regulator is unable to maintain a steady voltage so the voltage fluctuates wildly. Even though the....
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The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here. Resonators/filters of other frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may also be used. Use of different frequency filters/resonators will involve....
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Solar energy has now become a popular alternative for the production of electricity. Here is a green energy project for school students on how to make solar lamps for your home. The main component of this simple solar lamp circuit is a small solar panel and....
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
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This post shares a proximity detector circuit comprising mainly NE555 IC. This circuit can be used for burglar alarms based on beam interruption, with the added advantage that the transmitter and receiver are housed in the same enclosure, avoiding any wiring....
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A high quality stereo amplifier circuit of 44 Watts (22 Watts per channel) using TDA 1554 IC. This is a powerful audio amplifier circuit for 2 channels....
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On the primary winding of the first IF transformer there is no capacitor. Does that mean it has only one tuned circuit, and the primary coil is just an inductive coupling The routing of the twisted pair couldn`t be done exactly the same every time. Was it....
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There is little to be said about this circuit. All the work is done by the regulator. The 78S09 can deliver up to 2 amps continuous output whilst maintaining a low noise and very well regulated supply. The circuit will work without the extra components, but....
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As shown for the general multi-function alarm and timing circuitry. The timing of the circuit can range from 5 minutes to 3 hours. Timing components C2, VD1 and VT1 composition..
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This TDA7056 power audio amplifier electronic circuit diagram project will provide a maximum output power of 1 watt into a 8 ohms load using a 6 volts power supply, or a maximum output power of 3 watts into a 16 ohms load using a 11 volts power supply. As....
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Hello, this is my first post here. I built several versions of JFET static charge detectors and I`m seeing some differences I can`t explain so I`m....
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As we know, traditional soldering irons uses mains ac supply to get heated but this will be annoying when we want to use it in the absence of mains supply. Here is a simple inexpensive circuit which we can call it as a inverter for normal soldering iron....
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Based on NE555 this circuit turns on and off the IC output by a momentary switch. In other words it works as a mechanical latching relay, but the circuit backs to the start condition when you switch off the power supply. This feature is often required in....
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This is the version with 3 6N11 tubes. And as far as I can see identical to the Phenix. It looks and feels very well made. The separate power supply is a bit bulky but works well and keeps the size of the main box small and cute. The on/off switch is....
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PID-Control with 68HC11. STEPPER CONTROL. 68HC11 read encoder. High accuracy RPM-measurement with 68HC11..
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A project with two distance sensors that signal an Arduino to operate a servo motor when an object comes into range. This currently works well, except that the sensors are outputting a relatively high voltage all the time, so I have to set a very high cutoff....
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Resistor between pin 10 and 11 is a 100K Ohm one, the other a 2K. Fixed capacitor was by trial and error, to get crystal on the exact frequency, somewhere near 39pF and the variable one a little more: 39+20var, see 4060 datasheet. The output circuit on the....
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Perfect pitch, which is based on the 8751 microprocessor, is an inexpensive and easy-to-build instrument tuner/frequency counter with a built-in headphone amplifier and a visual metronome. Perfect pitch converts the audio signal from your instrument to a....
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The basic clock circuit (top schematic below) is similar to the binary clock (on another page) and uses 7 ICs to produce the 20 digital bits for 12 hour time, plus AM and PM. A standard watch crystal oscillator (32,768) is used as the time base and is....
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Over 90% energy saving than incandescent or halogen bulbs Lifespan is over 50,000 hours. No flickering. Good for human eyes. No RF interference or UV radiation. Special design for excellent thermal management Input Voltage: AC85-265V Output Voltage:....
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AB generated at both ends of the voltage is adjusted to take after being rectified by supplying the motor armature windings, thereby adjusting 15W Lan achieve speed purposes. I..
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A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds The circuit comprises two timer....
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This portable am fm radio circuit is designed using the LA1800 IC and some other external components. As you can see in this circuit diagram the LA1800 manufactured by Sanyo Semiconductors, require few additional components. Also the output signal is driven....
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This document describes a basic circuit that can be used to power high impedance, high voltage, low current devices such as EL backlights and fluorescent tubes. This project got its genesis when I needed a simple, yet flexible inverter circuit for an EL....
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A resistor R8, capacitors Cd and thyristor V AC switch delay composition. Lamp lighting delay time is determined by Rs, C4. Press the component parameters as shown in Figure 2-..
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Because the CS5501 16-bit-delta-sigma analog-to-digital converter lacks a start convert command, it converts continuously, outputting conversion words to its output register every 1024 cycles of its master clock. However, by incorporating a standard dual....
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Doorbell for the Deaf. Circuit : Andy Collinson Email: [email protected] This circuit provides a delayed visual indication when a door bell switch is...
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This timer circuit uses a 555 IC timer and three 74LS193 counters to drive an LED display. SI is activated by one person, who turns on piezo buzzer BZ1 via Ql and also starts the clock; SI is activated by the other person being timed. ..
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There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The....
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This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine decorate the time. When see the circuit uses digital IC number CD4093 make good easy. And use transistor....
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This circuit provides interferenced rejection for the CW operator. The 567 phase-locked loop is configured to respond to tones from 500 to 1100 Hz. The Schmitt trigger reduces the weighting effect caused by the output of the PLL remaining low after removal....
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Charging current is about 100+mA, which is the internally-limited maximum current of the LP2951. For those wondering, this is compatible with just about any single-cell li-ion battery since li-ion can generally accept a charging current of up to about 1c....
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A 5v power supply to act just like a switch. I will be controlling it with an Arduino like described here: You won`t be able to drive it directly from the Arduino pin, as most general purpose relays require at least 150mW to switch which is >30mA @ 5V. You....
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Compact Fluorescent Lamps [CFL] are low in price, plentiful and easy to find. Unfortunately, the current crop of these lamps seldom lasts as long as their warranty. Usually only the electronics fail and the lamp part of the bulb assembly are still very....
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Here is the circuit of 20W audio amplifier using LM1875 IC. LM1875 is a very high quality low distortion 20 Watt audio amplifer IC available in TO-220 package. This IC has many built in features like thermal shutdown, current limiter, high gain, high current....
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Didn`t measure my resisitors exactly and since they are +/-5% and Vref has a range of 1. 2 to 1. 3 volts you can easily end up over 6 volts. Here is a worst case example: The reason that I disagree with that statement is that they clearly work well in....
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This is a simple home telephone ringtone generator circuit which is built with applying only several electronic components / parts. It generates simulated telephone ringtone and requires only DC supply with 4. 5V DC to 12V DC voltage. One may possibly use....
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Incredible Shruthi-1 hardware synth with its excellent SMR-4 MkII filter board, both of which I built about a month ago and which I love to bits for exploring new sounds. However, as a sound designer I`ve always been interested in pushing the boundaries, so....
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Completely self-supporting garden lamps using solar cells as their energy source are gradually becoming more and more common. How do they actually work We took one apart to ¬nd out. From environmental and technical considerations, buying such a solar-cell....
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Analog to Digital Converters - Successive Approximation Type Analog to Digital Converter, working,circuit diagram....
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The range of this FM transmitter is around 100 meters at 9V DC supply. The circuit comprises three stages. The first stage is a microphone preamplifier bu....
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A very popular circuit for driving DC motors (ordinary or gearhead) is called an H-bridge. It`s called that because it looks like the capital letter `H` on classic schematics. The great ability of an H-bridge circuit is that the motor can be driven forward....
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Understanding how quartz-crystal resonators operate can lead to designing crystal oscillators with improved stability and better noise performance....
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Three audio circuits are combined in the circuit shown. Each input is coupled to its own level potentiometer (Rl, R2, or R3) an..
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Use a pair of Maxim"s 5V-powered MAX231 RS-232C transmitters as drivers to obtain a 2-color LED. The transmitters require only a singleended, 5-V input to generate ± 10 V internally. Their outputs are short-circuit-proof and can supply as much as 10....
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MOSFETs cannot always just be connected to the drive signal and be expected to work properly. Due to the construction of the MOSFET, driving it is not the simplest of tasks, especially for beginners. There are many users who regularly ask for help on MOSFET....
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A portable USB hard drive is a great way to back up data but what if your USB ports are unable to supply enough juice to power the drive A modified version of the Silicon Chip Usb Power Injector is the answer. For some time now, the author has used a....
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This is a circuit of Low-Light Level Drop Detector. This circuit utilize self-biasing configuration to detect small changes in light level. This circuit....
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As a result of the power switch integrated circuit A, it has a simple circuit, the sensitivity is high, working and reliable. It belongs to the people filling liquid level auto..
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In the case where analog signals are being used as the logic control, hysteresis from a Schmitt-trigger input can be used to prevent haH-wave power output. The circuit operation is as follows: at low input voltages, Q1 is biased in the off state. Q2....
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This page describes the hardware and software design of a printer power switch controlled over USB from my Linksys NSLU2, aka Slug. The unit can, however, be controlled from any Linux box, and can switch anything, not just printers. My NSLU2 acts mostly as a....
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There are a number of npn transistors that will oscillate in the audio range when reverse biased. Minimum supply voltage is 7V for low power transistors such as BC109, BC238 and 2N2222A, it becomes 12V for medium power transistors such as BD139 and is 16V....
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Ql is a fixed oscillator operating at 455 kHz. Ul is a mixer, with its own internal oscillator running at 45..
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The temperature of a quartz crystal for oscillator should to be kept constant to operate at very stable frequency. This oven temperature controller is suitable...
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Details of rigging an Evinrude E-TEC engine, particularly with ICON gauges and ICON controls, and with a special emphasis of NMEA-2000 details and TRIM circuit details...
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This fluid level sensor circuit is designed for using an ac sensing signal to eliminate electrolytic corrosion on the probes. The ac signal rectified is used to drive T1 transistor that drives a 12 volt relay, that can activate or stop some device. R2....
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The following graph shows the measured temperature rise above ambient for a typical range of power supply voltages. The upper two plot lines are for no heatsink, with the LM4702 mounted above the PCB (as it normally would be) and mounted below the PCB (which....
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At89s51 microcontroller will be the main component controlling the process, and display different digits on display. The seven segment display is found in many electronic devices. It is just 7 LEDs that have been combined into one case to make a convenient....
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This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and....
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Bridge crane control PLC ladder design Detection retract mechanism ladder hide programming manual and automatic operation of two run automatically follows Runtime: 1) When the ..
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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 ap....