New Circuits Page 80
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A tube commonly used as a tuning indicator in old radios. I had to try them out in my amps. So I plopped together a quick video to see the dramatic and cool visual effect. I will probably tweak some values but overall I am very happy with the visual effect.....
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Reverse the DC power connections on such a motor and its shaft will rotate in the opposite direction. One way to control direction is to use switches arranged in the following manner: This configuration is called an H-Bridge due to its shape. Let`s say that....
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The core infrared theory for getting this tutorial working was already described in the Infrared Receiver tutorial, so I`ll run through an abridged version here. First I`ll describe as an overview what infrared is and how it relates to our lives, then I`ll....
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A pair of multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is, that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the....
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A 2004 Chevy Tahoe that totally lost power. I was driving at 60 mph and watched my tachometer drop to nothing. It has been in the shop for three days now, and they are having trouble figuring out what is wrong. They have tried a couple things but the engine....
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MINIATURE ISOLATED AC/DC POWER SUPPLY. This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately...
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This diagram comes from the Progressive Communications Receiver that is in most of the latest ARRL Handbooks. This amplifier is used anywhere an IF amplifier is needed. W6BKY has a receiver article at Hamradio-online that shows how to build this circuit on a....
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This circuit in below uses two quad voltage comparator using IC LM339 to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first....
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I have finally finished my first prototype PCB but I am a bit worried about the amount of heat generated when using the BMSat max power in myapplication (ultralight hybrid electric vehicle). At 30A cont/50A burstI have almost 20Wloss. It seems to me that it....
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Free-space optical (FSO) communication uses light as a medium to transmit data. We did communication between two computers using laser(without help of any existing means of communication). We sent texts from one PC to other(Laser Chat Messenger) just like....
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This simple alarm timer circuit is made with 4060 which has an integrated oscillator with a good stability with a relatively wide frequency range. In the c...
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The feedback resistor determines the bias of the oscillation circuit. Generally, C-MOS IC uses 100k ohms to 10M ohms (normally, 1M ohms) feedback resistance, while TTL IC uses 1k ohms to 10k ohms (normally, 4. 7k ohms) feedback resistance because of low I/O....
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Two Simple Relay Based Motorcycle Alarms Circuit These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`....
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Provide zero crossing detection to my controller. Using the schematic below, I managed to generate square wave signal, representing positive v/s negative half-period. The problem is that the resistor needs to be quite large : Quite the heater. Also, voltage....
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You should notice that the opto-isolator LEDs are connected to three wires labeled "FWD", "REV", and "ENA*. " These wires deserve a bit of explanation. The FWD, REV, and ENA* lines are the interface between the bridge and the microprocessor. You will notice....
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The above circuit is recommended for use in SSTV applications with use of the sound card with a computer. This is the JVComm style of interface. This circuit may also be used for RTTY and PSK31 applications. Many users modify the above circuit to include 1:1....
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This is a circuit of Frequency Doubler using 4011. This circuit uses one CMOS quad, two input NAND gate package type 4011. This circuit consist of two...
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Back panel terminal connectors: Audio out, Trigger In, Clock In, Clock out CV out; plus the chord of the power supply which is internal, note that there`s no button to switch it ON/OFF: just plug and play. SEQUENCER steps mode with 8 levers from lower to....
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The TDA4661 is an integrated baseband delay line circuit with one line delay. It is suitable for decoders with colour-difference signal outputs (R-Y) and (B-Y)..
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Using two gates from a CMOS 4011 NAND chip, a simple Squarewave oscillator can br made. Alternatively a CMOS 4001 chip can also be used, or a TTL equivalent. In this circuit the mark space ratio can also be independently controlled by varying the value of....
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The MAX3420 is a USB peripheral controller chip with an SPI bus. This page hopefully contains enough information to help you easily make use of the device in your projects. The MAX3420 provides a very simple approach to adding a USB interface to a circuit.....
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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 tutorial explores a common digital concept using the NI Multisim software environment. It examines a four-bit counter that uses a 555 timer IC to generate the clock signal. This tutorial takes less than 30 minutes to complete and consists of 37 steps to....
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This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will accommodate all the usual types of normally-closed input devices - such as magnetic reed contacts, foil tape, PIRs etc. But it`s easy to add a normally-open trigger.....
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An astable multivibrator, often called a free running multivibrator, is a rectangular wave generating circuit. The circuit doesnt need any triggering. The timing of the circuit is determined by the resistors and the capacitors used in it. The details of the....
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General purpose circuit of the simple pressure sensor alarm is built around a couple of readily available cheap components. Working of this circuit is str....
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This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip....
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A timing and counting circuit using integrated circuit chips with seven-segment LED displays is used to display current lap time, the previous lap time, and also the total number of laps completed on an assembled 1/64th-scale slot car racetrack. A switch....
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Unique applications of 567 tone/frequency decoder IC? Here is one of them: pulse generator with 25% duty cycle (active factor). This signal generator produce....
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This sound wattmeter uses a row of colored LEDs as a scale to show the relative power output of your amplifier in watts. It is easy to be inserted into the speaker box. All you need is to hook a supply voltage to it. The value of R1 depends upon the....
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Modern acid batteries and lead plates, are embodiment of simplicity in use. Unlike NiCd batteries, they must be recharged by connecting to a constant volta....
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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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The main part of this doorbell circuit are two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1...
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The CS4328 is a complete stereo digital-to-analog out- put system. In addition to the traditional D/A function, the CS4328 includes an 8 digital interpolation Filter fol- lowed by a 64 oversampled delta-sigma Modulator The Modulator output controls the....
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The disk magnets are in attraction on each end of the power coil. The coil is pulse charged, forcing the permenent magnet field to push away from the center of the coil. When the electromagntic field collapses in the coil, the permanent field reforms in the....
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When the power supply input to IC1 is the output pin 3 at a frequency of 1 kHz. The frequency is Q1 and Q2, which will continue to use push pool work interchangeably. If this is the positive output signal Q1 Q2 will run the delete function this reason, C2....
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A few people have requested some clarification about calculating resistor values for the triac circuit. If I`m doing this correctly it might prove helpful in adapting the Sous Vader for custom builds. If I`m wrong, hopefully somebody will point out my....
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I needed to test some crystals for a project I was working on. I found lots of testers on the internet, but they all where lacking in one thing or another. I decided to take one of them and add the features that I wanted to it. This is the result. I also....
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A band-width limited amplifies shapes the waveform sampled by the 40 MHz high speed, pipeline Analog to Digital Converter (fast ADC, or fADC). It is well known that the shaping time is twice the time constant (peaking time), per pole of the filter network.....
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The design is based on the previous analysis of calculating the game in a circular shift register. While designing, it occurred to me that small extensions to the design would enable additional game play features, such as replay and manual input. The final....
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The circuits incorporate two FM Demodulator TDA2555 systems to perform the Demodulator functions required in a dual sound Carrier TV system for demodulating the sound Carriers The difference between TDA2555 and TDA2557 is the number of stages of the Limiting....
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In order to keep the speed of the motor constant when loads are applied, a control application circuit is needed to apply the purpose. The H-Bridge circuit may control the speed and direction of the motor. The below diagram shows H-Bridge with 4 inputs and....
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This design can be used for charging high current lead acid batteries in the order of 100 to 200 AH, the design is perfectly automatic and switches of the power to the battery and also itself, once the battery gets fully charged. A filter capacitor after the....
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A bridge rectifier "pack" is highly recommended over constructing a bridge rectifier circuit from individual diodes, because such "packs" are made to bolt onto a metal heat sink. A metal box is recommended over a plastic box for its ability to function as a....
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Uses three transislor stages und Foster-Seeley discriminotor to give audio output of 1 v peak to peak. -D. Bray, Solid State Makes Debut in Big Screen Color Tv, Electronics, 39:8, p 99-105. ..
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To protect downstream circuits from overvoltage conditions that show up during load-dump events or transients, we can use the MAX6495MAX6499/MAX6397/MAX6398....
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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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Lots of consumer electronic equipment like TV sets, VCRs, CD and DVD players employs infrared remote control. In some cases, it is desirable to extend the range of the available control and this circuit fits the bill, receiving the IR signal from your remote....
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This is a handmade prototype research project, intended to demonstrate what goes into a tracker and to facilitate developing tracker-related magnetic-field models. This is not a product. Functions needed in a product but not needed to explore field model....
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Light emitted by Xenon flash tube is transmitted to phototransistor MRD300 through optical fiber. Sensitive current is amplified to triggering a string of thyristors simultaneously. Therefore, high voltage of 6000V is set on loader R. This optical trigger....
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How to build a voltmeter for DC voltage measurements without using multimeter testing This is a simple digital voltmeter circuit that can measure voltages from 0V to 9V. The main part of this circuit is a dot bar display driver IC LM3914. Input voltage....
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This project is a wonderful idea of saving electric bill when you are using a heavy wattage bulbs. With miniature components and extreme care you can build a low power lamp dimmer right into the socket. Instead of a relativity expensive trigger diode, an....
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After an LCD workout you`ll find LED segments pretty easy to drive, so don`t worry too much about the programming! That 20M circuit shown above has code => & schematic => Tec- excuse these boring Q`s, but they`ll help us to better appreciate your quest. This....
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It is best to remove the glass from the regulator so that you can move the regulator freely then attach the glass after you install the motor. Once you have the motor installed operate the regulator with the motor to position the glass attachment points....
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The 555 timer IC is a very versatile and useful component and can be used for many things, from giving clock pulses to switch debouncing and as an output transducer. The basic 555 IC is housed in an 8-pin carrier, and these come in DIL and SOIC formats. They....
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A gas leak detector circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is used to convert 9V into 5V DC to drive the gas sensor module. The gas leakage....
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Direct-coupled Single-Ended (SE) 6V6 and 6V6GT Tube Amplifier Schematic with ECC83 Driver Stage. From the book Build your own Audio Valve Amplifier by Rainer zur Linde...
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Imagine devices that can disable and destroy microorganisms-viruses, bacteria and fungi - by means of a pulsed, intense, magnetic field! They are not devices for the distant future. They are for today! Already several different pulsed magnetic field....
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Thyristor is a switching device based on internal regenerative feedback of 2 transistors. One of the most popular type is called silicon controlled rectifier(SCR). They are basically a PNPN structure. They are very reliable and have current ratings up to a....
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Before fitting this or any other engine cut-out to your vehicle - carefully consider both the safety implications of its possible failure - and the legal consequences of installing a device that could cause an accident. If you decide to proceed - you will....
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This circuit is a circuit diagram mini amplifer. This amplifier circuit has a power of 10 watts. This amplifier circuit is very suitable to apply to your car audio. This amplifier using IC TDA2009A, as amplifeir power. To avoid excessive heat in the IC using....
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This is a very simple ring modulator circuit which will allow you to make interesting analogue sound effects using two audio sources and some kind of amplifier or recording device. Almost everyone has access to a couple of mp3 players and some powered....
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The vehicle acts in any way at this point electronically - for example, by its metal (change frequency of an oscillator) or by its components (eg RFID) Depending on the method used different grades of security and error tolerance can be acheived. Even....
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Field strength meter is extremely useful when working with RF devices. It can be used to quickly diagnose whether a transmitter circuit is working, and can be used to detect RF signals in the environment. The simplest field strength meter could be built with....
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The battery capacity is the important index of weighing battery quality. There are many methods in the volume test of the rechargeable battery. Can be according to the discharge curve of the battery, carry on short time and discharge, thus so rough as to the....
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Oscillating circuit (coil) are made on a ferrite bar. If you wish to listen long waves winding "1-2" has 135 turns and 3-4 has 20 turns. If you wish to receive medium wave winding "1-2" has 75 turns, and "3-4" has 7 turns (wire used must be CuEm 0. 15mm). In....
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Dans ce site, vous pouvez trouver des contributions dans des domaines qui m`intG©ressent particuliG¨rement. D`ailleurs, vous pouvez me suivre sur Twitter: @davbucci. Le site est composG© par des contributions plutG t hG©tG©rogG¨nes. Vous pouvez y accG©der en....
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CMOS Pocketable Timekeeper is pocket size time circuit circuit diagram of CMOS Pocketable Timekeeper and various other timer project advanced timer and electronics project...
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This low cost automatic emergency lighting circuit turns on a lamp during power failures. It is powered by a NiCad battery that is being charged by the mai...
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A couple of USB DACs but no one have I2S output. Some people doesn`t need S/PDIF input and they want only USB. With these requirements is unnecessary to convert signal first from USB to S/PDIF and next to I2S for DAC. This board have analog headphone output,....
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A simple and easy to build Hi Fi audio power amplifier circuit is shown here. This 6 watt hi Fi audio amplifier circuit uses TDA2613 IC....
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Sensitive low-current relay coils often operate at much lower voltages than their typical ratings. This can be undesirable in some applications, where low supply voltages can result in erratic system behaviour. In some instances, this problem could be....
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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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Those who`ve scrutinised my PC-board layout very closely, will see that I`ve changed the design slightly from the circuit which I posted a while back. ....
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This circuit is inexpensive, easy and quite simple. This is general audio amplifier which can be used for computer, CD player or other devices which have headphone output. The circuit was deliberately designed using no ICs and in a rather o....
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This solid state relay circuit uses 120 volts household mains and should only be attempted by someone that has the knowledge and skills to safely construct such a project. Otherwise personal injury and or property damage could result...
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This circuit is not an absolute novelty, but it is simple, reliable, "rugged" and short-proof, featuring variable voltage up to 24V and variable current limiting up to 2A. You can adapt it to your own requirements as explained in the notes below....
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A schematic representation of the SASS 2400 is shown in Figure 2 below. The cyclone has four main sections: a cyclonic cup, stripping column, cistern, and water feedback loop. A high-efficiency, brushless centrifugal blower at the cyclone exit pulls air into....
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This is where truthfully you need to migrate to pic micro and possibly look at compilers such as offered by proton Smart which incorporate Sony IR in and Phillips RC5 codec`s But it is the safest particularly if you intend to use this for Security aware....
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Because switching power supply energy-conservation also brings the huge economic benefits, cause the attention of the various circles of society to be popularized rapidly. With the technical development at full speed of power, high frequency, becoming the....
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Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and Loud Speaker. In place of a pair of wires, it uses invisible infra-red light to transmit audio signals from TV to Loud....
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You can`t expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your transmitter is capable of....
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To convert the MaCom 10GHz "White Box" (or "Whitebox" for the search engines) unit for ham radio use. Since we`re following in the path of others who`ve already modified these units, there isn`t much new here in the way of modification instructions, but I`ve....
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The circuit just required 2 transistors to drive the relay the the relay act as a switch to activate the buzzer. Any number of normally-open switches may possibly be applied. Fit the mercury switches to ensure that they close when the steering is. The....
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The usual procedure for the production of sustained oscillations in tuned L-C networks is to overcome circuit losses through the use of designed-in positive feedback or regeneration. Then, during the circuits on-transient oscillations will build up triggered....
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A distribution substation, is characterized by the apparent power of the transformer and whether it is aerial, terrestrial or underground..
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This is a simple and inexpensive clap operated switch, which uses only four transistors and resistor/capacitor network. The name of the project itself suggests its application. It can be used for level control in hydroculture project. Also for kitchen....
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This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated. When a call is coming to the mobile phone, the....