Popular Circuits Page 210
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using the LM3915 monolithic integrated circuit can be designed a very simple audio power level meter that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display. One pin of the....
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This electronic lie detector circuit project will give two readings: one for difficult questions for the subject and another to show its emotional state in....
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Avoid drilling extra holes and making changes to the chassis and pcbs by all means. This will decrease the value of your amp since you will not be able to restore it to the original state anymore. Make sure to take pictures of the original state of the amp,....
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The output of this circuit is push-pull and consumes less than 3mA (with no signal) but drives the earpiece to a very loud level when audio is detected....
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Using this circuit you will connect to a single parallel port electronic circuits requiring up to 96 digital output, optically insulated lines, 3 to 15V powered. The CD4094B consists of an 8-bit shift register and a 8-bit latch. Data is shifted serially....
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The circuit in Figure 1 is that of a 4-bit asynchronous counter, also known as a `ripple counter`. It consists of 4 J-K flip-flops whose J and K inputs are tied to logic `1`. This connection causes the output of each J-K flip-flop to toggle every time it....
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This is a circuit for an intercom is a is a stand-alone electronic communications system intended for limited or private dialogue. Below schematic shows the application circuit of LM390 on intercom. Gain control can be done by capacitively coupling a....
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The electric fence control circuit is composed of the +6 V power supply circuit, high-voltage output circuit, trigger control circuit, alarm circuit and protection circuit, and it is shown in Figure 4-30. +6 V power supply circuit is composed of the power....
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Circuit shown in Figure 3-10. This is a multi-function input with a preamplifier, including the tuner input, a magnetic tape playback input, magnetic phono input and phono equa..
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IC-1 and the associated circuitry form a stable audio tone generator that feeds a buffer amplifier, Ql and Q2. The tone output is taken from the emitters of the transistor pair to supply a carrier voltage for a balanced modulator made up of four diodes—Dl....
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This is a multifunction RJ45 network cable tester. It is the design of the network cable (RJ45) test, and telephone (RJ11). It is cheap and easy to use. It works for network, telephone, cable with RJ45 half Registered Jack plug immediately indicate whether....
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Circuit is shown. Group 4 analog electronic circuit switch (S1 ~ S4): S1, S2, S3 for parallel delay circuit, when the power is turned on by their R4, VB6 drive Triac VT, VT dir..
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This is a simple LED circuit that takes power from the USB port. I needed this USB light since long time ago but, finally; I was able to build it. The circuit schematic is so simple: Just one resistor and one White LED. I did use a 10,000mcd white LED. It....
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Circuit Description: This circuit uses an astable multivibrator to change the face-up or facing negative circumstances, also uses a flip-flop, flip-flop state that there had be..
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The following circuit shows about Infrared Toy Car Motor Controller Circuit Diagram. This circuit based on the 4017IC. Features: operating at ....
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Adjustable dual voltage power supply lines shown, can be used as a power supply line frequently used experiments. Its current does not exceed 1A, but two voltages are adjustabl..
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This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam headlights when there is oncoming traffic. Simple electronics project with circuit diagram....
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This miniature audio amplifier delivers up to 250mW and can be used like a final stage audio amplifier for radio sets. The schematic is very simple: one BC....
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The PR4403 is an enhanced cousin of the PR4402 40mA LED driver. It has an extra input called LS which can be taken low to turn the LED on. This makes it very easy to build an automatic LED lamp using a rechargeable battery and a solar module. The LS input is....
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Dual channel thermometer is simple PIC ADC based project. It`s a inexpensive thermometer with low cost components. Don`t used any high sensitive or high cost sensor for thermometer. I am using only simple silicon diode. Dual channel means this thermometers....
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This is ultrasonic proximity detector circuit. This circuit consist of micropower opamp and a pair of matched piezo-ceramic tranducers. It uses a 9V battery as....
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In the article you will find a description of the universal PIC programmer, which suggested the involvement of Jens Madsen Dyekjar [ http://www.jdm.homepage.dk/newpic.htm ]. Program allows districts PIC12C5XX, 12C67X, 16C55X, 16C61, 16C62X, 16C71, 16C71X,....
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This low-cost function generator, based on the Maxim MAX038 high-frequency waveform generator, produces sine, triangle, and square waves from under 1 Hz to over 20 MHz..
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In the circuit below, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is....
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This circuit is based around the 555 timer circuit, used as an astable (free running) oscillator. The frequency (pitch) of the tone is set by the resistors and capacitors in the left side of the circuit. The first one is a potentiometer (variable resistor),....
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Initially the neon and xenon lamps are not conducting and act like a very high (almost infinite) resistance. Capacitors Cl and C4 in conjunction with DI and D2 form a voltage doubler circuit, which can charge C2 up to about 300 Vdc after several ac cycles.....
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Most metal detectors work on the fact that metals in a magnetic field change the behaviour of the field. There are two general approaches to detect these changes. In one approach, an alternating current is provided to a transmit coil. A receive coil is used....
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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....
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This simple circuit allows you to use your oscilloscope as a Time Domain Reflectometer (TDR). This is how it works. Send a pulse down a cable and watch for the...
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Schematic diagram in hard copy relating to the computer CSIRAC. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common....
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A 27MHz NBFM transmitter circuit schematic with MC2833 and 2 FET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components and am MPF6660 RF amp, this transmitter delivers up to 3W into a 50 ? antenna. It is capable of....
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Process-control applications often require a monostable multivibrator (one-shot) with a pulse width that c..
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It`s based on a Philips class-H audio amplifier IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply. Our new Mighty Midget Amplifier can really pack a punch - around 36W RMS continuous into a 4-ohm load when using a 13.8V supply. However,....
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FET has high input impedance, high input impedance amplifier can be made. However, FET amplifying device, the distributed capacitance and the Miller effect input capacitance of..
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This LED thermometer is designed for in home use, to read temperatures between about 60 and 78 degrees Fahrenheit. It is based around a precision temperature sensor IC, the LM34DZ. This sensor require no calibration and can measure temperatures of between....
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Digital visitor counter is a reliable circuit that takes over the task of counting Number of Persons/ Visitors in the Room very Accurately. When somebody enters into the Room then the Counter is Incremented by one and when any one leaves the room then the....
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The circuit is so simple that there is little to say about it, but it gives very good results. Tr1 is operated in grounded base mode with input to its emitter to give low impedance input. The values shown give correct operation from 9v. If operating from....
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AC motor control circuit sprinkler If the circuit in the motor is an AC motor can be designed according to the circuit shown in FIG connection, work process and the principle o..
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This circuit allows a 4-to 20-mA current loop to control an isolated SCR drive. IC1A and are one-shots. Q2 detect..
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RMS value of the sinusoidal waveform is meas ured by the average reading voltmeter of which scale is calibrated in terms of rms value. This method is quite simple and less expensive. But sometimes rms value of the non-sinusoidal waveform is required to be....
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The right way to do this is with a small extra pc board to accommodate the new components, firmly secured inside the case, and wired carefully and neatly. Unfortunately, I did none of these things, but it worked reliably and if it ain't broke. I used a pot....
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When a vehicle is driven on the highway at night, it is required that light beam should be of high density and should illuminate the road at a distance suf....
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A wireless hands-free telephone device circuit diagram as follows: ..
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This is a circuit design for PWM Speed DC Motor Rotation circuit. This circuit has two functions, Forward-Reverse and Regenerative Braking function. This circuit is control by MOSFET. This is the figure of the circuit; On this circuit, we can control the....
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What follows below is the schematic of Flashlight Finder circuit diagram using the LM3909, a monolithic oscillator designed to flash Light Emitting Diodes (LEDs)..
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The schematic is shown in figure 10. The circuit can be hardwire onto a breadboard or you can purchase a pc board, see figure 11. The LCD display used is a 2 line by 16 character display. You can use an LCD module with a Hitachi 44780 controller or....
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This circuit is not a novelty, but it proved so useful, simple and cheap that it is worth building.
When the positive (Red) probe is connected to a DC positive voltage and the Black probe to the negative, the Red LED will illuminate.
Reversing polarities....
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The SillOO series circuit input is connected to a capacitive field sensor-possibly a piece of doublesided circuit board. Any induced voltage change on the plate is fed to the input of the peak detector section of the op-amp circuit. The Schmitt trigger....
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The current tracer helps locate a defective IC that is loading down the power supply. The tracer amplifies the small voltage drop caused by current flow along a fraction of an inch of PC wiring and drives an ordinary microammeter. Needle-point test probes....
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The basic die circuit is given. A 555 timer, ICl, is connected as an astable multivibrator. This feeds clock pulses to divide-by-six counter IC2 tbe outputs of which are decoded by gates Nl to N6 to drive an array of LEDs in the familiar die pattern. When....
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AutoZone Repair Guide for your Driveability And Emission Controls Emission Controls Evaporative Emission Controls....
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This simple add-on capacitance meter has been specially designed to help you identify capacitors from 1p to 10u. There has always been a problem identifying capacitors, due to the enormous variety in size, shape and coding. Most of the time it is impossible....
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This metal detector electronic project schematic circuit is designed using a simple 555 timer integrated circuit. As you can see in the schematic circuit, this metal detector electronic project requires few external electronic parts...
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A nice schematic for an lm3915 VU meter. I have attempted to create a band pass filter in order to only input part of the audio frequency spectrum into the VU meter circuit, this is becuase I plan to have 5 of these circuits to make a spectrum analyser or....
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Humans have been using light and sound to achieve altered states of consciousness for thousands of years. Primitive cultures used flickering fires and rythmic drumming to induce these altered states. Today, you can choose from a wide variety of electronic....
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Homemade disinfectant circuit of the present example describes the electrolytic salt solution method to produce sodium hypochlorite (NaCk "disinfectant can be used for students living supplies disinfection...
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Common collector amplifier via a DC and AC (3) common-collector amplifier circuit DC and AC path when common collector amplifier circuit for analysis, can be divided into DC an..
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The i2c-tiny-usb project is an open source/open hardware project. The goal of i2c-tiny-usb is to provide a cheap generic i2c interface to be attached to the usb. It is meant as a replacement for those simple and cheap printer port to i2c adapters. A USB....
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This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV / 0C is exploited for this application to create an accurate electronic thermometer. To display the measured....
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The line-in pin is clearly visible in the pinout of iPod connector shown on the iPod wiki. From then they came a long way through making their first hand soldered mic to now selling neat small mics on their site. They have got their own SIP VoIP servers....
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I have two ICM7555 CMOS 555 timers, and I was wondering if anyone has any good am radio transmitter circuits that incorporate two (or one!) 555 timers....
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You can easily improve on a previous Design Idea to produce a slightly simpler resistor arrangement with better timing balance between switches, using a single resistor value (Reference 1, Figure 1). The use of a single resistor value, RS, in a series chain....
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If you want to make a flasher unit for you motorbike then this circuit is just for you. This simple turn signal flasher circuit can be easily built and installed in any two wheelers for the desired actions. The circuit employs just two 2-pins instead of 3 as....
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To check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. In this circuit is used with a positive signal input, when has negative feedback only. And the inverting....
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Electronics Tutorial about Active High Pass Filter including its High Pass Filter Frequency Response, Op-amp Voltage Gain and Active Filter Construction....
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A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections. This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is....
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This little circuit can be used to dim lights up to about 350 watts. It uses a simple, standard TRIAC circuit that, in my expirience, generates very little heat. Please note that this circuit cannot be used with fluorescent lights...
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Did it ever occur to you that an array of white LEDs can be used as a small lamp for the living room If not, read on. LED lamps are available ready-made, look exactly the same as standard halogen lamps and can be fitted in a standard 230-V light fitting. We....
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The heart of the circuit is IC1, General Instrument`s AY-3-1350 melody-synthesizer IC. IC2 is a TCM1512 telephone ring detector IC that is powered by the telephone line. The circuit`s operation begins when IC2 senses a ring pulse on the telephone line. The....
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If the piclist is an any indication the 16f877 seems to be the new favorite hobby microcontroller, a position that used to be occupied by the 16f84/16c84. Compared to is older brethren the 16f877 has much more to offer at around twice the price. As for all....
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R1_47K 1/4W Resistor R2_4K7 1/4W Resistor R3_22K 1/4W Resistor R4_1K 1/4W Resistor R5, R12, R13_330R 1/4W Resistors R6_1K5 1/4W Resistor R7_15K 1/4W Resistor R8_33K 1/4W Resistor R9_150K 1/4W Resistor R10_500R 1/2W Trimmer Cermet R11_39R 1/4W Resistor R14,....
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The excellent high input impedance, high slew rate, and high voltage qualities of CA3140 op-amp make it suitable for Wien-bridge sine wave oscillator. The basic circuit for Wien-bridge sine wave oscillator is shown in the figure below (the upper part). You....
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This design idea overcomes a significant problem with using photodiodes in fast applications like barcode scanners, CD-ROMs, and DVDs--high output capacitance of the diode. The key part in the circuit is the Analog Devices AD8014..
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Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten....
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For the full bridge inverter circuit i planned to use IRF2807 (75V Vds, 82A Ids) and Two IR2110 for the driver. I never use IR2110 before and failed many time when i want to make a H-Bridge for DC motor last year. My DC input voltage is 34V (2 series solar....
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Using two of the most basic oscillators you can DIY, this particular circuit works great to modulate our main LFSR circuit. It also sounds pretty cool on its own. The main noise generator for our circuit. The basic circuit at play here is a Linear Feedback....
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This schematic diagram shows a ring-around LED flasher circuit. This circuit will turn off two LEDs and turn on the other two until the timing cycle reverses..
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That be On After Delay Circuit. I uses mosfet in the circuit for delay easy more than the transistor. By have the work of the circuit be when press , S1 ,....
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This project is exactly what you need. It is simple to construct and can be connected to almost any analogue multimeter.
The scales are accurate over each range - certainly good enough to provide you with the value of any capacitor between 1p and 10u.
The....
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Up to 10 A continuous output current, or operation with 50 % ESD and 18 A peak current are possible without a fan if sufficient natural air flow is present and the ambient temperature does not exceed 30 °C. A small CPU fan (40 x 40 mm) should be used for....
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Lego rotation sensor is a nice little device that enables RCX to measure rotation of an axle with good resolution: 16 steps per turn. Unfortunately it is plagued with a problem: at low rotation speed value read seems to jump randomly from 1 or two units. So....
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This sawtooth wave generator gives not only the sweep signal at out 1, but also a synchronization output at out 2 when the sawtooth fly back and begin sweeping. The frequency formula of this sawtooth wave signal is: Remember that the real frequency might be....
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It was designed for an application in a welding machine: there are lots of bits of machinery which are cylindrical in shape and which are subjected to heavy surface wear. For instance ore crushers, and the idler and roller wheels off track laying vehicles,....
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The SCR is wired across the trigger circuit of the flash gun. Normally, the SCR is off, so the flash gun is able to cha..
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a circuit diagram showing how the accelerometer is connected to an Arduino board & external power source (not complicated at all, is it)..
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This circuit is a complete application is 2. 1 amp, two satellite speakers for TDA and one for the subwoofer, making the 2. 1 system, widely used in commercial applications as an amplifier for computers, which may give an increased in its audio system with a....
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As shown for the TRIAC dimmer circuit diagram, working principle is: power, 220V lamp VR4 R19 through C23 charge. Because of two-terminal voltage capacitor is not mutated. char..
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