Popular Circuits Page 6
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I used input frequency 10Hz to output 1Hz.This is a 10 divider circuit. When we need a standard digital clock 1 Hz. but we have the input signal is square wave....
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This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. It is connected permanently to the 12-volt supply and its....
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Using a standard PLL circuit, such as the CMOS 4046B with some passive components, is a well-known way to design a clock multiplier. Unfortunately, using a PLL in a digital circuit has two disadvantages: It takes a long time for the circuit to reach a stable....
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A low-current flyback converter is used here to generate ±15 volts at 20 mA from a +5 volt regulated line. The reference generator in the SG1524 is unused with the input voltage providing the reference..
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This switch will suit the Modular Burglar Alarm circuit. However, it also has other applications. The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7....
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The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here....
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This one-valve (ECL82) CW Transmitter occupies a very special place in my amateur radio history. I was first licensed in 1994 but did not operate on air. I committed to only ever operate equipment which I had made myself. I had no time for radio construction....
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Birds singing analog signal generator circuit Shown is an analog chirp signal generator circuit. The inverter circuit consists of six CD4069 composed of three oscillators, two ..
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How to connect and program the Arduino/Atmega168 microcontroller to LCD display and DS1307 RTC....
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The simplest stereo balance meter circuit schematic available on the internet! When Left and Right signals are equal, no output is present from U1 and pin....
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When developing a battery charger, using a real battery might be inconvenient. The battery simulator circuit described here is an alternative. The battery input positive and negative terminals should be connected in place of the battery in the charger....
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This is Hot Water Level Indicator circuit. This circuit can be used to monitor level of hot water in a tank. This circuit is simple and inexpensive. this....
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This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature. The Headphone Buffer circuit board is small enough (1.2" X 1.4") to squeeze into even the smallest spaces and power requirements are so low that existing....
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LM13700 VCAs are used in a configuration identical to that shown in the Nat Semi data sheet that produces minimal distortion. It is not perfect but then VCAs never are. Two VCAs are used in inverse polarity for each of the X and Y multiplier sections to....
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Inductors can be mimicked quite easily using operational amplifiers. The circuit shown here was developed to have an inductance of 1000 H (say, one thousand Henry) with good damping. Using this design you can build a resonant circuit with a center frequency....
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When your application requires no PWM (pulse-width-modulated) dimming or controlled frequency operation, your primary concern may be that too much current could damage or destroy your LEDs. In this case, you can make a simple LED-current limiter from a....
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The capability to support multiple satellite positioning systems is increasingly a requirement for automotive navigation systems. The UMSZ2 Series GNSS module from ALPS Electric meets these requirements at a very compact form factor ..
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This simple and slightly odd circuit can clearly show the level of the supply voltage (in a larger device): as long as the indicator has good 12 volts at its input, LED1 gives steady, uninterrupted (for the naked eye) yellow light. If the input voltage falls....
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The Nixies I`m using have 10 cathodes (shaped like numerals) and a screen-like anode. These are old Russian IN-12A`s that I obtained from an excellent Ukrainian shop on eBay. Other Nixies might have more cathodes for a decimal point or other symbols (like....
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One of the drawbacks for some of us is that Linux support for PICs is not very well known. The information is out there, but no one has laid out the process of going from writing C code to programming a chip. Written for Linux users that are familiar with....
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The TBA120U is an i. f. Amplifier with a symmetrical FM Demodulator and an a. f. Amplifier with adjustable output voltage. The a. f. Amplifier is also provided with an output for Volume Control and an input for VCR operation. The input and output of the....
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Timer for Charger Circuit Diagram. This timer circuit helps to keep the battery in top condition through automatic charging for 5 to 6 hours daily so that the instrument can be left unattended ..
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By ISO120 and INA105 instrumentation amplifier as shown, multiplexer constituted 600V battery system battery monitoring circuit. This circuit 50 in series 12V battery (ie, the ..
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Here i-St@r comes with thesimplest mini audio amplifier circuitschematicusing LM386 low voltage audio power amplifier IC. This circuit is applicable to power medium sized speakers from a music player that can only drive earphones (lm386 headphone). The LM386....
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This schematic illustrates a real circuit, but it isn`t called a "two-input inverter. " Through analysis we will discover what this circuit`s logic function is and correspondingly what it should be designated as. Just as in the case of the inverter and....
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Here is vu meter analog circuit. The circuit is left connected to the line terminals of the amplifier. The VU meter is quite simple. T1 and T2 signal increase..
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Color sensing with camera and sufficiently powered processor running image histogram logic (or other such algorithms) can determine presence of certain colours fairly reliably. However, are there other, significantly more cost-effective mechanisms to....
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This Spy Pen FM Transmitter Circuit Can Be Built In A Ballpoint Pen. Crystal Controlled....
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Description: This circuit shows about 6-12 Chanel TV Transmitter-Coupling Circuit Diagram. Features: used to stabilize the 10 P to work in the 6-12 channel ....
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This new stereo FM Micromitter is capable of broadcasting good quality signals over a range of about 20 metres. It`s ideal for broadcasting music from a CD player or from any other source so that it can be picked up in another location. For example, if you....
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The classic Wien-Bridge oscillator, with incandescent lamp nonlinear stabilization, provides a low distortion sine wave source. A thorough and clear discussion of the Wien-Bridge oscillator is provided in Malvino`s Electronic Principles. Using an inexpensive....
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This Is a capacitor power supply. This is a very small currents of energy-effective, because it has very little loss, much smaller than the miniature transformer. Capacitor impedance is inversely proportional to frequency. This is a great disadvantage when....
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Hydrophone is a tool like microphone, but this tool is used in the underwater environment. When used to pick up a sound on the air then this tool becomes less....
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Distance markers and iff signals are inserted at separate grids on one tube, while radar video from input 3 is impressed on control grid of other pentode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. l, Electron Tube....
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Notch filter is a filter that remove a certain B. Ideally a notch filter will remove only single point of frequency component, but practically it will remove....
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The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to five LEDs each, at 9V supply. IC1A amplifies about 100 times....
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I have an 01 Civic EX. A/c blew very cold. On a hot day ran into a store, came out to start the car and it blew hot air. Checked the fuses and all seemed fine, but just hot air. Took it to two mechaniscs, both said the compressor was fine and coolant was....
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A notch for a narrow frequency band of a few per cent or even less normally requires close-tolerance components. At least, that`s what we thought until we came across a special opamp IC from Maxim. In filters with steep slopes, the component tolerances will....
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No Description available...
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This amplifier designed for TV transposers and transmitters, it incorporates microstrip technology and discrete linear push-pull transistors with gold metalization and diffused emitter ballast resistors to enhance ruggedness and reliability. Fully assembled....
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This circuit has been designed to alert the vehicle driver that he has reached the maximum fixed speed limit (i. e. in a motorway). It eliminates the necessity of looking at the tachometer and to be distracted from driving. There is a strict relation between....
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Voltage driving type pulse width modulator 1. feature and function of TL494 TL494 is produced by the United States IR company. It is voltage driving type pulse width modulator, which can be used as switching power circuit in display, computer and other....
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This is a low-cost and simple intercom circuit design. Some intercom circuits is build by applying integrated circuits. The circuit described right here utilizes 3 certainly transistors which easy to find on the electronic store. Even a new....
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This amp uses the basic circuitry of the 60W power amp (see Index), but modified for true Class-A operation - it should be pretty nice! This amp has been built by several readers, and the reports I have received have been very positive...
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These two amplifiers are of very good quality, simple and economical in their manufacture. They have two inputs for a 4mV (500KΩ) sensitivity microphone and an input for any 200mV (1MΩ) sound source, that is, the first input is for speech and the second one....
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Alarm system designs often require circuitry that can detect whether a phone line is active or broken. With this type of design, the primary difficulty is drawing less than 5 µA from the phone line over a line-voltage range of 24 to 58 V as the standard....
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Many designers opinionate that NFB loop controlled amplifiers are inferior because they degrade the sound, and yet I wonder what it is that these individuals think they actually listen to ? The fact is that most vinyl waveforms and CD pits, as pressed into....
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This text describes preliminary plans for a frequency meter for a bat detector. It measures the frequency of the local oscillator in a heterodyne type bat detector. This provides a valuable tool to help identifying the bat. The frequency is displayed on four....
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A 12V portable and mobile power supply circuit design which can be built quite inexpensively and needs only a minimum of circuitry. This circuit will give output current of 1 amp, well stabilized and smoothed..
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The ADV7390/ADV7391/ADV7392/ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V 10-bit video DACs provide support for composite (CVBS), S-Video (YC), or component (YPrPb/RGB) analog outputs in....
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It shows an automatic unattended burglar alarm circuit, mainly for family night, warehouses and other occasions automatic unattended. The circuit consists of pyroelectric infrared sensor light control circuit..
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This is a very simple circuit to build, just take note of the control pins on each IC, since both have enable inputs for counting or output, but once set you don't need to worry about them. From left to right, the first IC is a binary counter, 74ls163, that....
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This is a Mini MW (Medium Wave) Transmitter circuit. This circuit consist of combination of transistors SA103 and SA101. Those transistors is used as oscillator...
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In applications involving strain gauges, accelerometers, and thermal sensors, a bridge transducer is often used. Frequently, the sensor elements are high resistance units requiring equally high bridge resistance for good sensitivity. This type of circuit....
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If you need a wide-range, resistor-programmable monostable multivibrator, you can program tbe circuit for pulse widths from 1 JlS to 10s-107:1 range. A high-to-low transition at tbe input causes IC1"s output to switch low, thereby turning off Q1 and Q2.....
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This circuit a simple analog multiplier, the circuit operation may be understood by considering A2 as a controlled gain amplifier, amplifying V2, whose gain is dependent on the ratio of the resistance of PC2 to R5 and by considering A1 as a control amplifier....
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Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, engine control with injection calculators, airbag activation, or other various functions, called comfort functions. Among them is one which we tend to....
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A sample robot, using parts from VCRs and bought only the minimum necessary to make the simplest robot I could think of. At the time I was using the Nemesis microcontroller, produced by Kronos Robotics, however this was not a good choice for Romania, because....
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The circuit uses a 4011 CMOS NAND gate, a pair of diodes and an NPN power transistor to provide a variable duty-cycle dc source. Adjusting the speed control varies the average voltage applied to the motor. The peak voltage, however, is not changed. This....
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This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I`ve used a SPCO/SPDT relay - but you can use a multi-pole relay if....
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This project is a combined temperature and humiditymeter. It is an improvement on my PIC-based humidity meter and my PIC and AVR thermometers. I use an ATmega164, which as lots of I/O and memory. The humidity sensor is a HS1101, made by Parallax (p/n 27920)....
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To my new bestest pals: Anyone with experience on the old Uni`s? Model 1221. Looking to switch her to el34`s from 6l6`s. Not the savviest in the tuber....
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This is basically how the Scorpion jammers work except that instead of sending back a shifted doppler corresponding to a certain speed, they send back a constantly varying doppler shift where some units won`t display a reading while others display constantly....
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The two parts` component parameters and models of the circuit are corresponding to simultaneously obtain a rectangular wave with duty ratio of 1:1, its frequency f = 0.7/RB ¢ C. RB is Rb1 or Rb2 in the figure, and its upper limit value Rb1 < 0.5?RC1 ; Rb2 <....
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Circuit shown in Figure 3-79. It consists of two delay circuits, respectively. RPi adjustment potentiometer and RP2, respectively, can be changed and stop the motor running the..
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In the first installment of this two-part article on paralleling eGaN FETs, five basic designs, utilizing four EPC2001 (100 V, 25 A) paralleled devices per switch in a half bridge configuration were presented with experimental validation. In this second....
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Fires the slave flash exactly when the main flash occurs. Some flash settings on digital SLR`s are not compatible. Long battery life, 300 hours of use or more. If not turned OFF after use, the unit will shut down after 15 minutes of inactivity. Battery life,....
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The circuit in Figure 1 is a dual, grounded-lamp backlight
inverter that operates from an input of 9V to 24V, delivers
current from 0mA to 9mA per CCFL and has a dimming
ratio greater than 100:1. The LT1768 in the circuit is a
350kHz fixed frequency,....
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The CMX867A is a multi-standard modem for use in telephone based information and telemetry systems. Control of the device is via a simple high speed serial bus, compatible with most types of C serial Interface The data transmitted and received by the modem....
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Bass player with a stereo control as shown by LM1877 amplifier circuit configured. Cermet stereo microphone pickup stereo turntable on the left and right channel audio signals ..
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The LT®3465/LT3465A are step-up DC/DC converters designed to drive up to six LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. These devices integrate the Schottky....
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The figure for the feedback voltage Vf, it is taken from the output voltage Vo by EQ network. Input voltage Vf..
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Shown for the 300kHz signal generator. It consists VT1, T1, VD4 composition VCO and associated components. VCO using LC tuned collector, VTl the oscillating tube, varactor diode VD4, T1 1-3 inductive winding capacitance C3 ~ C6 and variable tuning circuit..
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This circuit is a phaser circuit, as used in guitar foot-pedal effects. It used 11 sections of op-amp such as LM324 but others will do. The whole circuit works of a dual rail supply: +/- 9v. The 0v rail is indicated by a chassis sign. Make sure these....
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This version of the familiar current loop offers a simplified and somewhat novel implementation in which optocouplers serve triple duty as level converters, isolation/protection devices, and bus interfaces. Galvanic isolation avoids ground loops, increases....
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A switched timer with equal make and equal space periods timing adjustable from over 6 minutes to 38 minutes. This timer circuit is similar to the 5 to 30 minute timer except that when switch S1 is closed, the on/off action of the circuit will continue....
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From this LM386 circuits we modify is this simple Doophone intercom. you can build them. read below. In this doorphone circuit,an 8 ohm speaker is used both as....
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A simple ultrasonic range finder using 8051 microcontroller is presented in this article. This ultrasonic rangefinder can measure distances up to 2. 5 meters at an accuracy of 1 centi meter. AT89s51 microcontroller and the ultrasonic transducer module....
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The circuit of AM transmitter is designed to transmit (amplitude modulated) DSB (double side band) signals. A modulated AM signal consists of a carrier and two symetrically spaced side bands. The two side bands have the same amplitude and carry the same....
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The 60Watt RF (Radio Frequency) Amplifier is simple all solid accompaniment ambit application ability mosfet IRF840. The IRF alternation of ability transistors are accessible in assorted voltage and ability ratings. A distinct IRF840 can handle best ability....
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A star-delta Bolt switching a starting circuit. Often used in Figure I-5 (a) of the knife; wiring. Therapy, but there are security risks in this method, that is, when KM; Jie b..
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Making your own circuit boards can be a daunting challenge. You have to design a schematic, test it on a breadboard, design the board layout, and then after all of that, you still have to print and etch a board! Luckily, we have Fritzing. Fritzing is a free....
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A single chip circuit for Echo & Delay. If you can modify a mic mixer circuit, you can easyly use this circuit with your microphone. PT2399 is an echo audio processor IC utilizing CMOS Technology which is equipped with ADC and DAC, high sampling frequency....
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Shown in forward and reverse dual interlock control circuit, on the basis of the..
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This stabilized voltage-to-frequency converter features 1 Hz -1.25 MHz operation, 0.05% linearity, and a temperature coefficient of typically 20 ppm/°C. This circuit runs from a single 5-V supply. The converter uses a charge feedback scheme to allow the....
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This is a basic single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays - and an optional Siren Cut-Off timer. It has an extremely small standby current. This makes it ideal for battery-powered operation. Use it in your....
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The Clock Controller was designed to be an exemplary of using `C` language to control timer0 interrupt, 7-segment LED and keypad scanning. It provides 1-bit sink current driving output, for driving a relay, opto-triac, say. Many projects requiring 7-segment....
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NJM2274AR is a sub package of NJM2274A, If you need see the description, please click NJM2274A. If you need NJM2274AR`s datasheet, please download it from below. By New Japan Radio Co. , Ltd ..
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The circuit illustrates the use of 3 frequencies to produce a graphic equalizer that will be used for acoustic signals. Equalizer a passive or an active....
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Charging the battery using a slow manner (charging current, long time) is the most economical and safest way. Design the trickle charger should grasp two points: First, the use..