Popular Circuits Page 63
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Figure 1 shows the block diagram for the NTE789. The input signal form the detector is amplified by a lowdistortion
preamplifier and simultaneously applied to both signal, generated by a local voltagecontrolled oscillator
(VCO), is counted down by two....
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Adding an unity-gain buffer to your analog circuit can increase its precision. For example, by itself, the op a..
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Programming the GPS Disciplined Oscillator (GPSDO) with the QP state machine framework -, which I badly need to write up - has led to the conclusion that I`ve run out of SRAM on the the Arduino Mega 2560 system. Not surprising given that there`s only(!) 8 kB....
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A bar column of LEDs is arranged so that as the audio signal level increases, more LEDs in the column light up. The LEDs are arranged vertically in 6 dB steps. A fast response time and a one second decay time give an accurate response to transients and a low....
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This device was designed on request and allows sequential operation of four Leds either to left or right direction, obtained by means of a 7555 CMos timer IC (IC1) wired as an astable multivibrator driving a Decade counter (IC2). This IC is set to count a....
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A nice circuit for using with audio preamplifiers, or any other circuit that use potentiometer and you need to control it from distance. The circuit includes Infrared transmitter and reciever with motor controller chip BA6418N...
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The circuit is pretty simple. The data lines on the LCD match up well with the data lines of the parallel port, and extra parallel port I/O lines can be used to simulate the RS, R/W, and E signals on the LCD. The LCD module is pretty low-lower (with the....
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The output of this modulator consists of two 6AQ5 lamps in a PUSH-PULL arrangement with a maximum output of 15W. 6C4 is used as a reversing lamp. The pre-amplifier role is played by the double-stage ESC83. The potentiometer R1 performs voice volume adjusters....
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In the circuit shown, the special launch tube T2 and its peripheral parts form a high-frequency oscillator with frequency in the range of 88 ~ 108MHz. The electret microphone picks up the audio signal, then the signal is amplified by T1, then the amplified....
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A simple light activated switch circuit with diagram and schematic using IC LM 311-wired as a voltage comparator and an LDR that acts as light sensor...
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For Check battery in car, It use IC CA3140 and Transistor, Easy circuit. For electricity pressure of automobile battery is important many factor. If be high....
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Hello, i want to make a simple active mixer to place in front of the power amp. I read some documents about active op-amp mixer.And they said : Any....
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Frequency signal tracking circuit is the phase-locked loop circuit, which is one of the basic application circuit of CD4046. The circuit shown as the chart and composed of CD4046 is a PLL circuit, and it can capture and track the input signal with the input....
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Cook in advance to open the door with a coal stove, before using the fire to be strong. Here's an automatic door opening device,..
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This neat little circuit can play 8 note tunes at any speed you want. You select the notes with 8 trim pots. The speed in selected through a ninth pot. The circuit draws very little power and can be powered by a 9 volt battery, with the addition of a 7805....
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Originally posted by Justinasia What is the likely cost of the Aleph Ono, all the parts I mean? Anyone know? If it is the same as the Pearl but better ....
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This is true subwoofer circuit. This circuit is used for 15- to 18-inch woofers and will not work with 8- or 6- inch subwoofers. It has bass-reflex, a....
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Automatic Headlight Brightness Switch Circuit Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your hea....
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Sound detected by electret microphone MIC1 is fed to IC1"s input through resistor R2, and capacitors Cl and C2. Resistors R2 and R5 determine the overall stage gain, while C2 partially determines the amplifier"s frequency response. To ensure proper....
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BTS412B as two high-side power MOSFET switch and two BU271L 50v for the low-side switch, can be composed of bi-directional H-bridge DC motor drive circuit shown in Figure 11-1l. The circuit is an electrical automatic doors design, continuous current up to 6A...
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This circuit is the sound generator super siren, for use be alarm signal get by live frequency generator circuit that use, op-amp circuit. The principle works to are while still no press switch S1 will still have no the loud sound comes out from a....
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This is a simple Electronic thermometer circuit. This is a inexpensive circuit because probe or sensor that is used in this circuit is 2N2222 silicon ...
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The system regards DSP56F826 chip as the key control module, uses the sensory chip of CMOS digital image, reachable 640* 480 picture element of definition that the picture is gathered. When needing the vision which carries on the high-resolution to be....
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Here`s a very simple, but practical circuit, which is used to check the type of LAN cables (straight or cross) as well as possible faults. So we use a unit that has 8 outputs, each one of which produces a pulse successivly. Only one output can be high at any....
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This USB to Serial RS232 adapter is very useful in many situations we need to connect a device with RS232 to a computer without RS232 port, but with USB port. Using FT232BM chip manufactured by Future Technology Devices International we can make a very....
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For a dark photocell, high resistance, the vohage across the diac rises rapidly with the line voltage due to the current through C 1, triggering the diac early in the cycle. ..
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This circuit amplifies the output of a regular electret condensor microphone quite nicely.. adjust sensitivity by turning R1..
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This document presents the contents of the TRF4903 demonstration and development tool kit. The user manual provides information on how to operate the MSP-TRF4903-DEMO kit and describes its hardware and software. Users should understand the MSP430F449 TRF6903....
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As shown in FIG, AD7520 is a CMOS type integrated circuit DAC over 10 channel, may be provided with l0 N-bit digital output proportional to the input current Io1, it offers the..
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BA2101 dimming using ASIC to produce a barrel of light touch stepping, Its a non- constant lamp suitable heir light. ~ Times each touch electrode sheet M, E lamp brightness can..
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The following circuit shows about Wii “Sensor†Bar Project Circuit Diagram. Features: bunch of infrared LEDs on the both ends of a bar, IR ....
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The first timer IC555 creates a negative trigger signal of approximately 45Hz (a trigger impulse every 22ms, DO NOT exceed 50Hz for proper servo function). The second timer IC555 modulates a positive square signal from 0. 9ms to 2. 1ms every 22ms, a method....
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A resistive voltage divider is used to establish a bias voltage for the input (pins 2 and 3). The demodulated (multiplex) FM signal is fed to the input through a two-stage high-pass filter, both to effect capacitive coupling and to attenuate the strong....
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The circuit as shown gives the bandpass operation the transfer function calculated from FBP(s) = where = 1 + s/Qo>0 + s2/w02. The cut-off frequency, 0, and the Q-factor are given by 0 = g/C and Q = gR/2 where g is the transconductance at room temperature.....
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Using the LTC3810-5 synchronous step-down switching regulator controller can be designed a very easy and simple 12 volt switching power supply electronic project using few external electronic parts. LTC3810-5 synchronous step-down switching regulator....
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In the precision circuit, an operational amplifier provides a buffered output and also acts as a 2-pole filter. The ripple will beless than 5 mV peak for all frequencies above 1 kHz, and the response time will be much quicker than in Part 1. However, for....
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Here is a remote tester circuit or remote checker circuit which can be used to test TV and other remote controls. The circuit is very simple using only few components. The infrared sensor used in the circuit is TSOP1738. When the IR waves received by the....
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Control pulses transmitted in blanking interval by tv network transmitter are decoded by receiver circuits shown and translated into six different switching actions used to introduce special program matter such as commercials, weather reports, and local film....
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15 Watts Class B Audio amplifier circuit. This 15W amplifier circuit is designed using a dual op-amp LM833. Diagram and Schematics are shown. Potentiometer enables volume control....
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The reason i was asking more so than just the power consumption was the fact that some stepper motors seem to have more wires than the four that i have and other stepper motors are called bipolar...
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As shown in Fig having a 50 input/output impedance of broadband video amplifier. In order to achieve a match signal transmission, reducing the reflected signal, often require i..
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There are some digital and analog that can be used for compensating a PT100 RTD nonlinearity. We can implemented the digital linearization by implementing the...
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This is a new design of a tutorial board based on the popular PIC16F84A microcontroller. It features eight single leds, a 7-segment display, an LCD display and five push buttons. It is an ideal solution for the beginner to take his/her first programming....
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Here is a easy circuit of a DC to DC converter using LM317T IC. LM317 is a very famous IC comes in TO 220 package. This high performance IC has a lot of good features like input supporting voltage from 3 to 40 volt DC and delivers regulated output from 1. 25....
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This 900 MHz Amplifier Circuit is built with BFG480W which has a good linearity performance. Therefore the BFG480W is well suited for LNAs with high linear....
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As a result of high quality materials and advanced technology, the machine output transformer frequency response can reach 10Hz (a 0.8dB) ~ 50Hz (a ldB), to improve the overall..
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Used in multiplier that acts with one of operational amplifiers of analog computer. Double-triode V1 here provides pulse-amplitude modulation, for use with separate pulse-width modulator to form desired product of two input variables.-A. J. Ferraro,....
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Nice small audio amplifier which use only few parts to give good quality sound. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. Although not perfect, this amplifier does have a wide frequency....
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Composite pipe circuit limits bulb cold current of the circuit b When the input signal is weak, the use of composite pipe circuit protection circuit shown in Figure 1 ..
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An op amp is used as a comparator and a sink for LED current. The output voltage of the amplifier changes about 1.4 V depending on the direction of the current. Only one transistor is on at any time. Maximum LED current is limited to 25 mA by overcurrent....
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This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of the wheel where permanent magnets pass by. The permanent magnets are attached to the wheelspokes and....
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Just connect 22k fixed resistors across each transistor base and ground and then you may connect the 50K Dual pot leads across these resistors, that should imitate a 10k pot variations quite closely. Hi Swagatam, so just to be clear, you want me to remove....
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A telephone uses an electric current to convey sound information from your home to that of a friend. When the two of you are talking on the telephone, the telephone company is sending a steady electric current through your telephones. The two telephones,....
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A radio that was stored for years on a dusty shelf must be awakened gently to return to its reliable operation and provide us with warm and pleasant sounds for years to come. Here are few generic notes on how a radio can be easily returned to life. Of....
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One of the simplest ways to get a motor to turn in both directions is by using a double-pole, double-throw (DPDT) relay. Along with the relay, this hookup requires two transistors and two Stamp pins, one for on/off control and the other for direction....
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Transistors Ql and Q2, with feedback provided via Cl from the collector of Ql to the base of Q2, forms a voltage-controlled oscillator (VCO). De- pending on the voltage applied to Q2 "s base, the VCO frequency ranges from around 60 Hz to 7.5 kHz. The....
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Below is a block diagram of a modern automated systems incorporate closed-loop feedback for motion control. They typically include a servo system that consist...
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I was lucky to use an HP33290A wave generator for my radio building projects, a fantastic instrument for generating all kind of signals up to 15MHz. Since I could not always rely on it and buying one would by far exceed my yearly hobby budget, I decided to....
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This circuit bellow shows an electrical circuit apply for Audi A4 Quattro 2004 model years. Component: Transmission, Anti-lock Brakes Circuit ....
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after it sets for awhile it runs for a couple seconds you can see injectors pulse then shuts off and no injector pulse does have fire and feul pressure have rebuilt distributor and replaced eec. You need to verify you are getting spark when you loose....
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A partial solution to quietening noisy PCs can be to reduce the speed of internal cooling fans. Low-cost fan speed controllers are available, but they often employ inefficient, heat-generating linear regulators and contain no temperature feedback mechanism.....
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Processor based systems usually require a voltage supervisor chip to produce a clean reset pulse to the processor whenever a brown-out` condition of the power supply is detected. More complex designs employing multiple power supplies can be unreliable if....
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The multiplication operation that is required to generate a signal of a frequency equal to the difference of the input frequencies, can be implemented in several ways. Actually a multiplied signal generally also appears when two signals are added and....
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Direct-reading" SWR meters that automatically compute the ratio of Forward and Reverse powers (i. e. you don`t have to adjust any sensitivity controls). Several years ago I built one to a design by G3WPO that was sold as a kit by Cirkit. It worked quite....
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This frequency/voltage converter enables calibrations of cassette-deck speed. It records a steady 1-kHz ton..
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This controller is essentially 3 pairs of LED sensors in a 3G -bridge configuration. The driver is capable of operating 3 actuators. The motors are connected in a Delta configuration. The apexes of the delta are connected to the center connection of each....
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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 headphones. In place of a pair of wires, it uses invisible infrared light to transmit audio signals from TV to....
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The solar cell is connected across the input of the FET (field-effect transistor), Ql, so that it will produce positive dc voltage to the gate when activated by light shining through the open shutter, decreasing the negative gate-source bias already....
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Programmable Timer in this website is very simple made from only 2 iC of wide range circuit and description of programmable timer various timer project...
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A bit of a newbie to creating circuits I have a 12V battery regulated to 2mA with an LM334Z current regulator. Here are the docs for the current regulator: ....
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Marx Generators are often used in pulsed power and high voltage applications to generate a high peak voltage pulse. The simplified theory behind them is that a number of capacitors are charged in parallel and then switches are closed to connect them in....
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My friend bought a digital camera that can take pictures and videos as well. But he tell that it have restrictions is available not long the battery runs out ..
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Hello all, I ran across this schematic for a watch timer in a hobby electronics book. Anyone built something like this before? My knowledge of electronics is somewhat limited. Here is the description: ""This circuit adapts a frequency counter to measure....
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This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
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Function: to trigerred device or freerunning. Component: Battery, Charger, Battery Connector, Capacitor, IC, Resistor VR1-10K, Resistor R1-1K, Resistor R2 ....
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Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts. The main advantage of this circuit is that it works with a voltage as low as 6V DC and consumes less than 8 mA current. The circuit can be fitted....
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This project couldn't be any simpler if it tried. Using the PC's internal 12V supply to operate a relay, it is 100% reliable. If the PC is on, the peripherals are on and vice versa - it can't be otherwise (unless the relay fails). Other solutions have been....
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LCD comes in various configurations and the most popular one is 16x2 matrix display. This article shows the interfacing of ATmega16 with LCD by displaying a simple character on the LCD. In this project LCD is working in 8-bit mode i. e. , the data....
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Have your already set up a Christmas tree in your house and decorated it with traditional lights? Build a couple of these led lights to enhance the Christm....
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Can someone help me find a schematic and codes about a digital thermometer using a LM35 and 7 segment display(0 - 150.5 degree celcius)..the code must ....
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To avoid grief when using 12-V power supplies with mobile transceivers, especially when there is a short -circuit failure of the series pass transistor, crowbar circuits provide protection by clamping the power line and blowing the fuse within microseconds....
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A short note describing how to replace crystal and ceramic resonator clock circuits with silicon oscillators and highlighting some of the technical advantages offered by these devices in microcontroller clock applications....
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Figure 1 shows a method for driving all the LEDs with a single driver IC from Catalyst Semiconductor (www.catsemi.com), the CAT32. Power comes from a single lithium-ion battery cell. A FET switch can independently turn off the group of six LEDs. The shutdown....
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As shown in the three-phase motor with broken bars of inspection circuit: ..
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The RA17C18 is modified version of the RA17C12, having a delay compensated IF amplifier and an additional IF output. It is a North American version of the RA17, ie. , it uses all BNC and SO239 connectors, all fasteners have unified threads, and the harmonic....
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