Popular Circuits Page 207
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Hi I have decided to build this mic preamp and tone control circuit which was posted on a another site. The Eq section is the same one used in the....
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The MAX104 processes analog input bandwidths that exceed 2.2GHz with 8-bit resolution. It sets a new standard for performance in high- frequency, high-bandwidth digital communications receivers, digital oscilloscopes, and high-speed data-acquisition systems.....
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Both circuits are used to control the thyristor contactor KM action to overcome the break phase protection relay prone to malfunction or refuse to move, and enhanced the sensit..
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The Metal detector project is designed for metallic body detection by
sensing variations in high frequency Eddy current losses. Using an
externally-tuned circuit, they act as oscillators. The output signal
level is altered by an approaching metallic....
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The circuit is suitable for inductive loads in general thyristor power unit (three-phase step-down DC motor speed and other exceptions), the output power more than enough to trigger thyristor 100A. Adjustment potentiometer RPz, can change the output pulse....
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I`m way behind. I`ve built all all kinds of modules since my last blog post. With each module I build, I begin to understand how little I really know about electronics. I`m learning a lot and I can now recognizereoccurring themes-especially with Op Amps-but....
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Using a LM1458 dual op amp IC. The circuit takes the audio signal rom the condenser microphone and amplifier it, so you can use the microphone as the input to some device which wouldn`t normally accept microphone level signals. The circuit requires a 6-9....
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The IR to RF transmitter circuit given here can convert the IR signals from your remote to RF signals to long distances. The circuit given here is a good one for extending the range of your IR remote. Also such systems does not need a line of sight since RF....
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Step-by-step instruction to build a AVR based versatile camera trigger with functions like: lightning trigger, sound trigger, interval trigger, slave flash trigger, bulb mode ....
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ET6201 is 1/ 7~ 1/ 8duty cycle of the LED display control drive circuit. By 11, the 6root root segment output gate output, 1root segment / gate output, a 1display memory, the control circuit, key scanning circuit composed of a high reliability of the chip....
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This device acts as a variable speed control for the heater blower in a car. It takes its power directly from the existing wiring and connects with just 2 wires. It will also work for any 12 volt device up to 10 amps. A PIC12F675 provides all of the....
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Build a CD47 Nixie Clock. Power: approx. 100 Watts (some might say "Isn`t it over- engineered", but you`ll see at the end of that project, that it`s ok. Nixies will be switched off when nobody is around- this will keep them alive as long as possible. The....
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I need to make a square-wave with variable frequency, but 50% duty cycle. The 555 timer seemed like a good idea, but with the normal astable multivibrator circuit you see everywhere, changing the frequency always ends up changing the duty cycle a bit.....
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Low-cut and Bass controls, Output power: 40W into 8 Ohm and 60W into 4 Ohm loads This design adopts a well established circuit topology for the power ampl....
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Audiostrobe glasses are used in conjunction with light and sound machines, as well as some brainwave entrainment software. The glasses have LEDs buil....
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A single diffused, wide base transistor like the 2N3740 is recommended because it causes fewer oscillation problems than double diffused, planar devices. In addition, it seems to be less prone to failure under overload conditions; and low cost devices are....
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Here the AM Radio receiver circuit diagram based on old single IC MK484. Components part list: R9, R10_ 6R8 R6_ 100R R3_ 1K R1_ 4K7 R7_ 5K6 R4_ 10K R2_ 100K R5_ 150K R8_ 820K Pot_ 10K log pot Coil & ferrite bar set C7_ 470p ceramic C, C4, C5, C6_ 470nF....
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This is circuit that can be used to strengthen the RF signals from a television antenna work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals The tuned circuit comprising the 15nH inductor....
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Phase Lock Loop (PLL) FM Detector with 565 PLL IC. the circuit diagram and internal structure of PLL IC 565 is shown in the given figures....
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Crap, the sensor on my clone is low resistance and the replacement heater is 45 Ohms. Is there anywhere you can buy the clone heaters or modify the station to accomodate the genuine heater Going home for the holiday week but the circuit inside last I looked....
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A very simple dual 15 volts power supply electronic circuit project can be designed using the LT3512 switching regulator IC manufactured by Linear Technology. This simple 15 volts DC power supply electronic project operates from an input voltage range of 36....
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CMOS switches are used directly to select the entries in the audio circuits, it can introduce unacceptable levels of distortion, but if the switch is included in the feedback network of an op amp, the distortion due to the switch may be virtually eliminated.....
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The multifunction circuit mainly refers to it can be "delayed pull", "time release", "delayed cycle" conversion three operating modes...
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Many antique radios run on batteries. These include tube portables, such as the Zenith model K-401 shown below, and "farm" radios, which were used in rural areas where there was no other source of electrical power. This article gives you some history on....
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the timer will generate the basic period (for example 20ms) and with some associated variables will be possible to "fire" an I/O pin to generate the signal. For example, using a 8 bit variable, we can divide the generated frequency in "chunks" of 256 (8 bit....
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In the absence of radiation, no current is drawn. At normal background radiation levels the power consumption is extremely low. The instrument may be left on for several months without changing batteries. In this way the detector is always ready to indicate....
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Transistor Q1-configured as a source-follower buffer stage, offering a bit under unity voltage gaingives tbe unit a high-impedance input of about 1 MO shunted by about 10 pF, which keeps only minimal loading on tbe equipment being tested. C1 serves as....
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Here is a portable, high-power incandescent electric lamp flasher. It is basically a dual flasher (alternating blinker) that can handle two separate 230V AC loads (bulbs L1 and L2). The circuit is fully transistorised and battery-powered. The free-running....
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As shown, the circuit can get several constant current output to the load resistor RL. Since the first RL floating, rarely used. The second RL is a virtual ground, do not often..
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The crossover network is intended for use when an existing audio installation is to be extended by the addition of a subwoofer. Often, this additional loudspeaker is one that has been lying around for some time. If its frequency response extends down far....
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The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator, RF amplifier circuitry. BA1404 FM transmitter can be operated from 76 to 108MHz and power supply for....
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The afterward diagram is 16W Bridge audio amplifier circuit. The ambit congenital based 2 pieces of ability IC LM383 in arch connection, so this amplifier is an arch amplifier. This is an old amplifier, LM383 is discontinued, so this LM383 ability be....
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Live-line detector is a circuit that detects the presence of a live mains conductor circuit operation: capacitive coupling between the live conductor and the....
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A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector. The metal detector shown here may well represent a new genre. At any rate, after some exposure, it is regarded as such by....
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For some time i wanted some way to measure laser power, without spending a fortune on a power meter. First off, it is not possible to build something....
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The first BC109C transistor is acting as a buffer. It provides the circuit with a high input impedance, around 250k has a voltage gain of slightly less than unity. As the Baxendall tone control circuit is a passive design, all audio frequencies are....
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The following circuit shows about Automatic Room Power Control Circuit Diagram. This circuit based on the NE555 IC. Features: uses two LDRs, use ....
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Values shown for high-stability variable-frequency oscillator give operation in 10-MHz range. Stable supply voltage is essential. Use silver mica capacitors in gate circuit for maximum stability. -E. M. Noll, FET Principles Experiments, and Projects, "....
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This alarm circuit activates when SI through S5 are activated. This lights LED1 and activates Ql via IC1C and IC1D. RY..
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The Digital-Analog-Converter fetches one of 15 parallelly pressed keyboard keys from the digital bus of the synthesizer and converts it into a control voltage (1V/Octave) and a GATE signal. The TUNE-COARSE and TUNE-FINE pots allow pitch adjustment of the....
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Conexants CX24501 is a highly integrated, MPEG-2/H. 264/VC-1, DIRECTV/DVB compliant, back-end decoder IC solution for high-definition digital TV which CAN be deployed in digital satellite, cable, Telco or terrestrial TV networks. By Conexant Systems, Inc. ..
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The signal from a synchro receiver or a variable resistive cam follower (potentiometer) is boosted by operational amplifier U1, whose output swing is limited by back-to-back zeners D3 and D4. The signal is then applied to operational amplifiers U2 and U3,....
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This circuit can be used in telephone lines for speech activity detection purposes. This detection is very useful in the case of half-duplex conversation between two stations-in the case of siroultaneous transmission of voice and data over the same pair of....
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Turn signals work, hazard lights work, stop lights work, head lights work. Tail lights don`t work with the headlights. I looked at the bulbs and they appeared fine. I switched the taillight bulb with the turn signal bulb and it work in the turn signal spot.....
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This circuit enables you to display four signals simultaneously using only one channel of your oscilloscope. Essentially, it switches each of the inputs through to the output in turn, with some signal massaging in between. As shown, it is suitable only for....
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A light-seeking solar-powered tiny robot based on a BEAM design. Article includes pictures, links, a video, and a schematic....
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This circuit shows a method which increases the power capability of a drive system for audio speakers. Two HA-2542s are used to operate on half cycles only, which greatly increases their power handling capability. Bridging the speaker, as shown, makes 200 mA....
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A small ultrasonic cleaning device and it runs 1 x 50W transducer at the moment. I am going to build another that uses two 20W transducers and was just wondering what the best configuration is, to wire them in series or in parallel My circuit designs should....
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A servo motor is a special geared DC motor equipped with an electronic circuit for controlling the direction of rotation, as well as the position, of the motor shaft. Because servo motors allows precise angular positioning of their output shaft, they are....
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In older posts I mentioned, that I resoldered several ATMEL ATMEGA16 processors. So, I decided to build something usefull using this MCU. As this controller has more ROM and RAM, I decided to use only high level programming language- C. All software in these....
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BU8732AKV is a PCM codec IC for digital cellular phones. This includes plenty of Analog input / output functions such as a 14bit precision linear. / A-LAW codec, a Microphone Amplifier with two systems, Amplifiers for speaker and earphone and a Switch....
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This is a very simple circuit to interface a current loop sensor to an input which is designed for a voltage, such as that from a standard potentiometer. This page is technical so that interested persons can build the circuit themselves, but 4QD can also....
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This is an automatic emergency lamp with day light sensing, means it senses darkness/night and turns ON automatically. Similarly it senses day light and turns OFF automatically. A simple emergency lamp which does not require any special equipment; even a....
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This device beeps intermittently for about two seconds when a person in a range of around meters emits a whistle. The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies consistently the signal picked-up by the small....
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Building an LC meter for a while since I do not have a multimeter that is capable of measuring inductance and while the multimeters I have can measure capacitance, they are not able to give accurate readings for small capacitance in the range of several....
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This Project Automatic Room Light Controller with Bidirectional Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately.....
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This circuit responds to RF signals bellow the standard broadcast band to over 500MHz and provides an visual, and audible indication when the rf signal is detected. By adjusting the bias of D2 with the R2 potentiometer the circuit can detect low power or....
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The Miller solar engine uses a 1381* voltage detector (a.k.a., a voltage supervisor) IC to drive a voltage-based (type 1) solar engine. The 1381 is normally used to reset CPUs and Micros when the power supply drops too low for reliable operation. So 1381s....
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The chassis is made of aluminum L-profile (30x30x2 mm) and the candles are made of 13 mm aluminum pipes. The structure is about 35 cm wide and 25 cm high, and assembled with two component glue. The fittings (E10) and bulbs (14V, 3W) are obtained from an old....
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The TS2418 is a monolithic integrated circuit telephone Tone ringer with bridge Diode when coupled with an appropriate transducer, it replaces the electromechanical bell. This device is designed for use with either a piezo transducer or an inexpensive....
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The circuit that has been used is shown in picture 1. Through the experimental part we will explain each of the parts function, but in order to have a notion of the basic idea, let just say, that this circuit besides the 5V power supply, is fed with a pulse....
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The congestion of the ether is becoming so great that efforts are continually being made to extend the channels of communication to higher frequencies. Wavelengths as low as 12 metres are now commonplace, but attempts to work below this are fraught with many....
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Figure 1 shows a simple, cost-effective way of providing these bias voltages. A step-up regulator, IC1, forms the heart of the circuit. This regulator switches at a constant frequency of 1 MHz and a fixed duty cycle of 70%. IC1 steps up the input voltage to....
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Hi! I made an opamp hartley oscillator using a certain electronics simulator and even though simulation takes place I`m unable to get any oscillation....
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This is the schematic diagram of DC motor speed controller circuit. The circuit applies two oscillators/timers which are connected as a Pulse Width Modulator (PWM). The timer chip which applied in this circuit will be an nmos dual timer/osc....
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This circuit will divide the frequency of a TTL compatible square wave signal by a factor from 0 to 999. The circuit comprises three decade counters IC1 to IC3 and a few NAND gates. The three 7490?s are cascaded and count is the input signal. When the....
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Simple variable frequency oscillator. This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer. With values given...
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FM amplifier is used for amplify signal from exciter in broadcast radio station. In this page, RF FM Amplifier uses solid state material with minimum gain 9dB. Input of the FM Amplifier needs 5-10 watt with power output about 100 watt. Whether you want to....
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This is design circuit for converter meter voltage to frequency. Normally we often encountered the frequency meter can be used in speed sensor, tachometer, measurement or signal recurring. This frequency to voltage converter (FVC) can be used to change the....
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You see that the feedback is DC coupled, not through a capacitor, from the plate of the second triode to the cathode of the first. An earlier design used AC coupled feedback. This version was unstable at low frequencies. Bode analysis showed that a 3....
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A very simple circuit, that will find application in the case where you have a lot of telephones installed on a telephone line and would want to know if somebody of them is open. Thus you will not be off any discussion. Simultaneously it can cut the certain....
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Dual power for each load refers to work simultaneously by the two-way power supply and two power supplies, respectively, the burden of electricity load. When at the way in whic..
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Here is a very useful lamp flasher circuit using the famous adjustable voltage regulator IC LM317T. LM317 can source up to 1A of current and so up to 12W lamps can be used with this flasher. Such a circuit finds huge application in automobiles. The frequency....
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This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and....
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The oscillator circuits presented on this page are from expired or non-maintained U. S. Patents. All circuits are presented in "Electronic Workbench 5. 12" or "Multisim 7 circuit simulation formats". A note on spice simulation of electronic oscillator....
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The picture shows the ultrasonic liquid level indicator circuit. This circuit is made up of ultrasonic transmitter circuit and receiver circuit.The ultrasonic transmitter circuit is made up of 555, R1, W1, C1 and ultrasonic transmitter head UCM40T. The....
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A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered. Without using the timer to wait the sensor works as expected. I have a PIR sensor connected to an ATMega328p. The PIR sensor has three pins; VCC, GND and....
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A serial interface and bias supply for the Seiko-Epson G1216N000 using an AT90S2313 because there just aren't enough applications examples for this display on the web. The display is a pretty old transflective gray mode TN LCD design with ok, but not great....
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Here is solar tracking circuit. This circuit is a power generating method from sunlight. This circuit need only maximum sunlight to generate power. This project...
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Here`s a 2x60W LM4780 Power Amplifier. LM3886 is very interested in our project was the first project, and were acclaimed. But the feedback we receive from you, from scratch, we knew we should make a complete device. One reason for that, but hard to find and....
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The digital sine wave generator (oscillator) circuit has the advantage that only few components are needed to generate signals with high amplitude constants and variable within a very wide range of frequencies. The circuit shown here generates a sinewave....
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The circuit does two functions: signal level attenuation and inverse RIAA filtering. The signal attenuation is needed to convert the 500 mV signal to 2. 5 mV signal. The inverse-RIAA filtering is needed to make the frequency response of the system flat (same....
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A simple burglar alarm circuits, sensors pyroelectric sensor IRA-E100SZI. When human movement is detected, the pressure on the electric buzzer alarm whistle. Sensor receives si..
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This is the circuit diagram of Line Follower / Line Tracker robot. The circuit taken from the tutorial documentation. You may download the full tutorial at the end of this article. The line follower robot use 8 pieces of proximity sensor module. The sensor....
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When using a regulated supply to reduce a supply voltage there is always the danger of component failure in the supply and consequent damage to the equipment. A fuse will protect when excess current is drawn, but might be too slow to cope with overvoltage....
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This 5 volt regulated power supply circuit project is designed using the NCP3155 DC DC switching regulator with fully integrated power switches and full fault protection. This 5 volt regulated power supply circuit project require few external electronic....