Popular Circuits Page 12
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A battery is a low-impedence source of power. It is most efficient and economical when supplying low voltage at high current..
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No description available...
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Build the circuit and measure voltage drops across each component with an AC voltmeter. Measure total (supply) voltage with the same voltmeter. You will discover that the voltage drops do not add up to equal the total voltage. This is due to phase shifts in....
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A very simple but very good amplifier unit, with low distortion. A similar modification was used as a preamplifier HAFLER. The quality however of the reproduced sound in all the symmetrical amplifiers regardless of the cost of the necessary materials,....
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The amplifier provides 10 dB of gain from 10-600 MHz and has a 1-to-l match at 50 ohms. The BFR91 has a 1 dB noise figures at 500 MHz, The circuit requires 13 Vdc at about 13 mA. Keep the leads on the 150 pF emitter bypass capacitor as short as possible. The....
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This simple stereo encoder circuit schematic is build with 2 IC MMC4066E and MMC4047 and one transistor BC547B. On IC1 2 and 3 pins is the audio output whi....
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This circuit uses two balanced modulators to produce a DSB signal and then reinsert the carrier, except t..
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We’d like to be able to use a PC to measure the temperature outside. Ideally this would be a serial connected device with a probe that could easily be placed outside. Google found us some, but there seem to be very complex and cost around $100! ..
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Arduino Event-Driven Universal AV Remote May 1st, 2013 Turn Everything on with Airplay TL;DR - I wanted all of my AV components to turn on and ....
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The Spartan-3an board has eight LED Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
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The PIC 12F629 and 12F675 have a factory set oscillator calibration value written to the last program memory location during manufacture. When programming the PIC the programmer software should read this value out, merge it with the program data being....
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The elements diameter of the antenna may vary between 5...8mm and the dipole diameter may
vary between 8...12mm (12mm recommended) without the need of changing anything to the length or spacing.
All elements except the dipole are electrically connected to....
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TL072 is amplifying an audio signal which is going to speakers & arduino analog input. Amp is powered by a wall wart with 12V 2A output. The same 12V is also regulated to 5V and used to power an AVR. The AVR is being used to PWM, using a power....
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The circuit will come handy when you have to follow the mains wires buried in the wall or even water pipes provided they are not too far away (2-4cm max). It will also detect a conversation on a telephone cable without actually touching it (for testing....
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The 25 watt power audio amplifier circuit powered using tube circuit. The tube TR will amplify the input about 20 watt, dual Trafo should be gain up to 40w watt. You can use wide voltage range 12v 20V to supply the power tube...
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And a transistor in series with C1 can be used to adjust the oscillator output frequency. Frequency may be in the range of 20pF to 0.01 F change, or as the tuning capacitor, th..
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The Sallen-Key realization of a 5.25-MHz, three-pole Butterworth filter has a gain of 2V/V and can drive 75 back-terminated coax with an overall gain of 1 (Figure 1). Used to reconstruct component-video (Y, Pb, Pr) and RGB signals, this filter has an....
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The Metal-Oxide-Semiconductor Field-Effect Transistor, or MOSFET for short, is similar in many ways to the junction FET (JFET). Both are voltage-driven unipolar devices that depend on either electron or hole movement-but not both, as does the bipolar....
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This circuit uses readily available parts to implement a 0-to-200-nA current source. The circuit borrows a PMOS ..
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The HandyBoard drives both pads at the positive supply of the battery. When one of the motor is supposed to turn, the handyboard drives the appropriate pin at 0V. The difference between two pads makes the motor turn. The Transistors are TIP 120 and TIP 125....
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From a SONY double tape decks with model number "SONY TC-W230" I have picked a nice LCD VU-meter. I have decided to add it to my computer tower case. the following steps explain how to do this. this is based on IC lablelled CXD1017 (impossible to find a....
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First step is always to look around on the internet. After some searching, I found out that the QAA75-sensor is actually made by Siemens. This broadened my search a bit. Turns out that Siemens refers to the communication as a “Boiler System Bus (BSB)”. This....
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LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC contains an adjustable voltage reference and an accurate ten-step voltage divider...
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By using a relay, you shorten the distance that you must pull the thick wires (especially through the firewall and under the dash), and you reduce the need for a larger switch. However, having said that, if you plan to connect to any of the stock JK....
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The following circuit shows about CD4017 IC For Automatic Room Lights Sensor Circuit Diagram. Features: has only one light sensor, using two LDRs ....
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The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR.....
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In order to meet the needs of the control loop, often require electromagnetic relay or transistor relay to accelerate or delay action, from action to constitute accelerate or delay circuit...
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A simple half-wave rectifier capacitor step-down regulator circuit VD1, VD2, Cl, C2 composition, after power across capacitor C2 available DC voltage of about 12V, the transist..
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This program is a simple Traffic Light Controller. Between start time and end time the system controls a traffic light with pedestrian self-service. Outside of this time range the yellow caution lamp is blinking. |
" "+ command -+ syntax -+ function -+
" "|....
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The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project. A compact 9-volt PP3 battery can be used with the transmitter.....
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The problem is how to control the speed of the motor. One way is to use the plane, radio, and speed control with the motor in it. That`s no fun! Mount the motor on the bench and just plug the batteryinto the motor. That`s even worse! It`s hard on the motor....
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The RF Combo (A3016) is a combination of three circuits. Its purpose is to provide circuit boards for Stage Four of our subcutaneous transmitter development. The printed circuit board has the same outline as the RF Tester ( A3014 ). The SAW Oscillator....
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This text regards MSC1210 as the cores of measuring, SIGPROC signal processing and communication, has designed the module of acquisition system of high-accuracy temperature. It is easy to expand that this system measures the passway, survey accuracy is high,....
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If the input is coming from, say, a Function Generator`s typical output clipleads, then the "black" lead or "-" or "ground" is connected to the circuit`s ground. From the Pin 3 of a 555 timer. ditto, the timer`s ground must be common with the circuit`s....
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No Description available...
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Precise, adjustable control of beats per minute from a largo of 18 to a frenzied, high presto of 500, These beats are produced acoustically through a speaker. A light flashes at the same rate. When SW1 is closed, CI begins to charge through Rl and R2. Cl....
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This web page describes the radio transmitter unit that flew aboard the Cirrus One rocket in April 2001. The intent of including the transmitter as payload was to: As the Cirrus One rocket was expected to achieve an altitude that would be well out of visual....
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The TX audio cable can be a little more complicated then the RX audio cable. Normally, the TX audio cable must have a circuit to attenuate the voltage leaving the sound card`s LINE OUT jack, otherwise the radio`s transmit circuit will be overdriven. Note:....
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If you are familiar with LED flashers using transistor, you may know the basic one uses two transistor, one capacitor and three resistors. There is other kind of oscillator called "flip-flop". As I'm starting to develop some basic circuits, I need a simple....
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This is a very simple FM receiver which build based on one transistor only. No chip or another active component. The output is connected to earphones, you need an amplifier circuit if you want to listen the radio with a loudspeaker. ..
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This simple AM circuit uses a 561B. There's no inductance/capacitance tuning circuit. The 365 pF capacitor connected between pins 2 and 3 does all the tuning. The circuit needs a good outside antenna and a solid ground. And if you want to further improve....
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A differential amplifier makes an excellent audio clipper and can provide precise, symmetrical clipping. The circuit shown commences clipping at an input of 100 mV. The output commences clipping at ±3 V. Matching Q7 and Q2 is necessary for good symmetrical....
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This is a circuit diagram circuit AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. Designed popular ZN414 IC this receiver covers medium wave band band from....
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Common non-sinusoidal oscillator circuit, waveform and frequency formula - square wave oscillator - self-excited multivibrator ..
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In this article, an RC oscillator is used as a baud rate generator. If you can calibrate the frequency of such a circuit sufficiently accurately (within a few percent) using a frequency meter, it will work very well. However, it may well drift a bit after....
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The linear dual tracking power supply, shown in the schematic, provides 0-15 volts, at 1/4 amp, maximum, using a discrete transistor regulator with op-amp feedback to control the output voltage. The supply was constructed in 1975; the negative ouput voltage....
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The circuit shown in Figure 1 is specifically designed to
control a single 1W CCFL. T1, Q1, Q2 and associated
components form a current fed resonant Royer converter
that produces a high voltage at transformer T1s secondary
winding. The CCFL current is....
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Speaker relay delay controlling circuit for audio amplidier..
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Look at the left side of the circuit (sensing coil and op-amp). When I wired mine the way shown in the schematic, it wouldn`t pick up anything. I didn`t have a 1mH radial inductor handy, so I fashioned my own using 30ga enamel wire and a round core (100....
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The momentary hold relay board and the acc delay module are a couple things I engineered. The momentary hold relay board is to power on the gps unit and the tablet, it replaces the need for you to push a button. The acc delay module is for my older amp. It....
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The following is a copy of an article posted by Wilf Rigter to the original BEAM email list and as such represent an important historical and technical reference The NuStepper is a circuit designed by Wilf Rigter, using a 74AC86 quad X-OR chip to make four....
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This circuit can detect only electrical wires connected to the mains (live wire). It has an LED for visual signalization and a buzzer for audio. As the electrician places the detector closer to the electrical wire the LED will flash at a higher frequency. As....
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Circuit operation principle of the device shown in Fig. Shaped permanent magnet mounted on the door ZT activity, normally closed reed AG mounted on the door frame. Usually ZT c..
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T1 steps down AC voltage from 115VAC (or 220VAC) to about 8VAC and is then rectified via bridge rectifier BR1 to about 11.52Vdc. C1 filters off the AC ripple. If you find the circuit output too noisy add another electrolytic capacitor over the output....
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Both circuits use the GE. SC146B, 200 V, 10 A Triac as load current contacts. These triacs are triggered by normal SBS (2N4992) trigger circuits, which are controlled by the photo-Darlington, acting through the DA806 bridge as an ac photo switch. To operate....
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This is the circuit diagram of a combination lock electronic simple using CI LS7220. This circuit can be used to activate a relay to control (the & off) press any device when a preset combination of 4 digits. The circuit can be operated from 5V to 12V.....
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The tracker is easy to build on a perfboard. I used a basic one-pad-per-hole perfboard and 26-gauge wire, but 30-gauge would probably be better. All the electronic parts are available from Mouser Electronics. Radio Shack sells the perfboard and the 2. 5mm....
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Transmitter FM 45W with valve. TECHNICAL CHARACTERISTICS: Tendency of catering: 220V AC Frequency of emission at FM: 88~108MHz Force of expense: max 45W (without the...
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This could be achieved by monitoring separate points either through the same recorder, or worse still, two separate recorders. In both cases the results need to be artificially summed to get the total current draw. Two problems exist with this, the first....
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The analog to digital converter (ADC) is a commonly required in most of the projects. Analog voltage measurement can be done using the ADC hardware built in together in a PIC. The picture below show a simple setup for measuring the voltage through the....
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A Simple Transistorized one Minute Delay Timer Circuit. It doesn`t include any complex or critical parts. You can use this circuit to generate a time delay of about one minute. That is, When you press the switch (Push button type is preferred) the LED turns....
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With the help of high gain high impedance operational amplifier, we can build a long time delay with resistor-capacitor (RC) circuit since it allow high....
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Constantly changing light and sound analog controller circuit 07 ..
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The SN75604, with input control logic but requiring only one supply rail, can be used in the "lights on" sensor and alarm driver. The device Vqq and enable inputs are connected to a voltage lead from the light switch. The direction control input is connected....
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Thanks for the diagram Zinc! Loooks very interesting - please keep us informed of any results. I`m MrFlathunter on Youtube and you commented on my 12V ....
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The electronic doorbell circuit is composed of the pickup amplifier, monostable trigger circuit, pulse counter circuit, music generating circuit and audio amplifier circuit and other components, and it is shown in Figure 3-113. Pickup amplifier circuit....
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Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery. The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse. To generate the 250V dc, IC1, a switching regulator controller, and T1, a....
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Automatic reclosing PLC control program designed according to the Control of automatic reclosing device and the PLC I/o definition, design ladder -shaped diagram as follows: 1)..
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One of the unusual features of the out-of-production Programmable Drum Set was its use of touch switches for control. Like most touch switches, these detect the difference in the capacitance of a plate when it is being touched by a finger versus the....
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The MiniBoard, a Motorola 68HC11 Robot Controller board designed by Fred G. Martin, also uses this driver. The day after, I then decided to prepare the page describing how to use C-52 EVB as a robot controller board. I asked my student for competition, build....
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Too much of a good thing can confuse you. I started out looking to build a simple 15W triode / 30W Class AB1 pentode PP amplifer. Class AB1 = because....
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The first sensor a robot usually gets fitted with is an obstacle detector. It may take three different forms, depending on the type of obstacle you want t....
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Data signal output, transmission distance when Sm the following circuit configuration may be employed as shown, the main measure is the output terminal of the pull-up resistor at the receiving end of two pull-up and pull down resistors...
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We created an RC Car that can identify a parking space and parallel park by itself. The RC Car drives down a street searching for a parking space to its right using a distance sensor. When the car has identified a space, the car checks to see whether that....
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A low ripple regulated DC power supply designed based on transistors is shown here. Such transistor voltage regulators are suitable for application where high output current is required. Conventional integrated series regulators like 7805 can only deliver up....
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This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876.....
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The following circuit Shows about Simple 100W Inverter Circuit Diagram. This circuit based on the CD4047 IC. Features: low power CMOS ....
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Used 1488kHz master oscillator quartz crystal resonator frequency stabilization, the output from the frequency divider dividing, obtained 4kHz, 12kHz, 124kHz three different square wave signal output. Circuit is shown. Transistor ..
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The following circuit shows a Radio Remote Control Circuit Diagram. This circuit based on the UM91214B IC. Features: use of DTMF (dual-tone ....
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Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method....
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This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost Rs 8 to 15. These LEDs emit a 1000-6000mCd bright white light like....
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Characteristics of the transistor 811A to the right, when this type of pipe work there is gate current generating means, in order to effectively discharge grid current, convent..
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This is one of the simplest circuit for a PC parallel port based DLA. The Circuit is mainly used to protect the port which is fabricated on the motherboard itself..
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Also known as digital amplifier Class-D amplifier with small size, high efficiency characteristics. Here are a circuit made easy with 555 Class D amplifier. It is the use of ci..
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All car batteries have required a 12v battery charger. And this is also true of Marine, RV and Power Sports batteries. The high efficiency lead acid type batteries available today require more efficient charging techniques. The most important factors in the....
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