Popular Circuits Page 190
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Introduction The MIC2290 is an internally compensated standard step- up Switching Regulator with an integrated power Switch and Schottky Diode The attribute of an internal power Switch and Schottky Diode makes the MIC2290 the most optimized solution for 48V....
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Integrated circuit U1 (an NE602 double-balanced mixer) is a combination oscillator and frequency mixer. Signals from the antenna input (at J1) are fed through dc-blocking capacitor C1 to the RF-gain control, R1, and fed to the input of U1 at pins 1 and 2.The....
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Using inexpensive components, you can fit a simple probe circuit into a pencil-sized enclosure. When both LEDs are on, the probe indicates the presence of an ac voltage; either LED alone indicates the presence and polarity of a de voltage. The....
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To get the best from an NBTV signal it is important to use the full dynamic range of the signal with no crushing at black level or peak white. To check the linearity of a video path it is usual to use either a staircase or sawtooth test signal. The circuit....
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An audio amplifier connected to the output will emit loud click sound for each lightning strike detected. When severe storms are approaching, this receiver will go crazy - producing hundreds of clicks per minute. This is a direct detection amplified....
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Our DTMF decoder can be powered from a 9V battery or from your parallel printer port. It can detect and display all 16 DTMF digits on your computer screen in real-time. The Window`s program can be placed in the minimize mode and still detect tones while you....
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The interval between rings can be lengthened or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring voltage is produced from the 120 volt side of a small 12. 6 VAC power transformer (Radio Shack 273-1365). Both capacitors connected....
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Let me tell you a tale. 8 months and 18 days ago, on March 25, I was sent an email requesting a commissioned piece of electronic clothing similar to my DJ jacket for a musical performer to wear on stage. I mulled it over for a bit, and came up with the idea....
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Audio Power Amplifier is an important part in the reproduction of sound in a sound system. Audio Power Amplifier LM 3886 with power IC Audio Power Amplifier is a highly capable and able to produce 68 Watts with power rata2 4Ohm load and capable of producing....
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Here is a 100 Watt inverter circuit using minimum number of components. Here we use CD 4047 IC from Texas Instruments for generating the 100 Hz pulses and four 2N3055 transistors for driving the load. The IC1 Cd4047 wired as an astable multivibrator produces....
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Microphone can`t be directly connected to a power amplifier because the signal is too weak. Standard audio power amplifier accept about 1 Vrms to give a full...
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Build your very own burning laser. Unlike other popular ways of building your own burning laser I will show you how to do it properly to ensure a long and healthy life for your new laser. There are several reasons for building a burning laser this way....
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radar n. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency....
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This circuit will record commentary and/ or music on one track of a tape and put the beeps that change the slides on another track. Gate U2a is used to trigger U1, which is configured as a timer when a pulse is received from either the tape input or via....
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The following circuit shows about Infrared Proximity Sensor Circuit Diagram. This circuit based on the MAX4230 IC. Features: 10kHz oscillator ....
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The circuit makes excellent use of the high slew rate, wide bandwidth, high input impedance, and high-output voltage capability of the CA3140 BiMOS op amp. The wideband gain of this circuit is equal to the ultimate boost or cut plus one, in this case a gain....
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Most timer circuits. Often used with electrical transformers containing low as 9V and 12V, and use of electrical control relays.but the 1-15 minute timer....
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The diac is a common component used to trigger triacs. The construction of a diac is similar to that with a transistor, but with both junctions doped to similar levels so that the two junctions' revers break down characteristics are similar. This is a fun....
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This circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when the tank is full. The circuit uses the widely available CD4066, bilateral switch CMOS IC to indicate the water level through LEDs. When the water is....
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This touch controlled musical bell circuit circuit produces a musical tone whenever someone touches the touch point designated as TP in the circuit. The circuit works from two AA cells and produces enough sound. The circuit uses IC UM 3481 commonly used in....
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This circuit can be used as a small beacon or marker light, amd toys or novelty items. R1 is an LDR that has‰¥10 k © dark-resistance, or a CDS photocell. C1 determines the flash rate. ..
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The impedance of these current generators is essentially infinite for small currents and they are accurate so long as VIN is much greater than VOS and IO is much greater than I bias. The source use an FET to drive a bipolar output transistor. It is possible....
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The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms. Lazar has adapted the sound card to use a common....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply....
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Monitoring a flame and directly switching a 120-V load is easily accomplished using the Ll4G1 for point sources of light. For light sources which subtend over 10° of arc, the L14C1 should be used and the illumination levels raised by a factor of 5. ..
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Imagine that is morning , you barely anticipate the bus for work and you can`t find your keys. If you suffer from this situation frequently, this circuit is ideal for you. A fizzle is the only thing you have to do. The overall circuit is small enough to....
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Compilation dial phone numbers with 15 commonly used libraries (plus number dialed) are stored in a standard CMOS RAM, one button keypad makes typing a phone number can be dial..
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The timing components are Rl, R2, and C,. Cl is a bypass capacitor used to reduce the effects of noise. At start-up, the voltage across C, is less than the trigger level voltage (1/3 Vnn). causing the timer to be triggered via pin 2. The output of the....
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When the comparator`s output changes its state from low to high, the rising edge of the output pulse, differentiated by the Cl/Rl chain, opens Ql. This blocks comparator via its strobing input and sustains its output in the state for a period of time,....
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Here is simple LED-power audio amplifier ambit with MOSFET amplifier TL071C and 2 may be up to 45 W into 8 ohms. For MOSFET IRFP240 and IRFP9240 are acclimated assurance with accessory can now be these modification. The arrangement is at the appeal SILICONIX....
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White Light is an interactive sound and light installation. It is part sculpture, part musical instrument and part social exercise. White Light invites viewers to become part of a complex sound and light display by manipulating the controls on one of 3....
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As shown for the driver circuit high pressure natural gas shut-off valve, the device 01 for the solid state relays. When the engine is in dual-fuel mode of operation, the opera..
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Used to delay beginning of crt sweep for expanded display. Provides three ranges: 0 to 5, 60, and 200 miles. Circuit is basically cathode-coupled phantastron, with additional coupling by returning suppressor and screen to same divider. Cathode follower....
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It`s one of the simplest circuits to get working but one of the more tricky to understand. This simple two-transistor oscillator has a technical name of astable multivibrator and provides a squarewave (of sorts) output in and out of phase. First up, keep....
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This is a simple servo tester which will comprehensively test the capabilities of almost any modern servo. It has two pushbuttons, CENTRE and SWEEP and a potentiometer which works as follows:..
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An oscillator can be built using LC (inductor-capacitor) tank circuit. When we vary the capacity of the capacitor in LC tank circuit then the frequency of the....
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S2 is used to initiate timing. A light-to-dark or dark-to-light transition stops this timer, depending on the setting of ..
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this LM4702 has found a new home in a Crown DC150 -- for some reason the driver board in the crown was fried but the power supply in good shape:....
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Clinical thermometer is only used by doctor because it is difficult to read. Here is a circuit of electronics thermometer used to measure vast range of temperature from -200C to 1250C. This single circuit electronics thermometer can be used to measure....
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I found some relatively cheap ex-army radiation detectors at an army-dump shop. One of them appeared to be suitable to even detect the (usually low) background radiation levels: A Frieseke & Hoepfner FH40T Geiger counter (fitted with a FHZ76V....
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This simple circuit produces a loud trilling noise, if no valid transmitter signal is received. This frequency must correspond with the resonant frequency of the piezo element, otherwise the sound level will be very low...
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Despite the popularity of digital devices, real world signals are typically represented by analog signals. Digital control systems process real world analog signals by using an analog-to-digital converter (ADC) to convert analog signals to digital.....
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The JFET-bipolar cascode circuit will provide full video output for the CRT cathode drive. Gain is about 90. The cascode configura-tioneliminates Miller capacitance problems with the 2N4091 JFET, thus allowing direct drive from the video detector..
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A bike with 35 watt HS1 bulb and I want to upgrade brightness of headlight so I decided to put H4 60/65 watt xenon bulb. An expert on this forum suggested me to use relays as the new bulb requires more power. I did some google to understand relays and how to....
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This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves (adjusting A0 and A1 pins see datasheet on if you want other....
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Automotive engine pulse points or other sensors to be filtered in the transmission device 3130 CMOS op amp, the op amp is used as a comparator to complete the input conditions...
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if you are not getting anything at 66 RED then that is a problem. You could have your dash light dimmer turned to the "OFF" position. Or the corrosion on the wiper for the rheostat could be so bad it can`t make contact...
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This circuit will produce sine, square, and triangle waves from 0. 1 Hz to 1 MHz and has a counter which will read the frequency of the function generator or an external signal of a few volts peak-to-peak that will drive the CMOS counter. ..
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Atmel described a simple programmer based on the AT90S1200 (NOT the AT90S1200A) controller in their application note, AVR910 (a modification to use the AT90S2313 is also given below).The circuit is so small and simple, I was able to put two of them together....
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Most circuits that provide an electrical stimulus for research subjects are constant-voltage designs; this circuit is a constant-current design. Stimulator circuits must be isolated for two reasons: to ensure safety and to minimize interference. Isolated....
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This is a very simple -5V supply using one 555, useful for analog blocks using FET Opamps using low power. This circuit came up when i had to design limited by inventory. It worked well for its need. It converts Positive Five Volts to Negative Five Volts to....
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Low-cost CW superhet receiver with a 4. 00 MHz Intermediate frequency. There is no AGC or RF gain control, however this receiver has good large signal handling capability. This receiver uses just 6 bipolar transistors and an op amp for reasonable volume into....
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These are modulator circuits for modulation of video signals on a VHF/UHF carrier. The circuits require a 5 V power supply and few external components for the negative modulation mode. For positive modulation an external clamp circuit is required...
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The operation of the circuit starts up and transport the stereo surround sound signal quality information on the master volume circuit. This will drive the left channel connected to LCH Model TL072 IC1A IC1B and attached to the right channel Rch. The outputs....
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hello everyone..im need some helps i`ve construct the PWM and PPM circuit the output going smoothly but i`ve some problem im not very....
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2003 Chevy Silverado K1500 Ext Cab 5. 3l V8 DTC codes P0740, P0753, P0758, P0785, P1860. I have 11. 73v at IGN 0. I have replaced the Ignition. I have removed an aftermarket Prolock security system. I have disconnected the wireing harness from the pass side....
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Figure shows the bean sprouts automatic watering control circuit. The controller consists of step-down rectifier circuit, power outage told implement (IC3), timing control circuit (IC1), temperature control circuit(IC2) and so on. The step-down rectifier....
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This switching circuit acts like a bank of interlocked mechanical switches; pushing one of the buttons latches its corres..
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The DC output at Pin 1 vanes linearly with the RMS input at Pin 4. 2 CT is tweaked until the svnc signal is in phase with the AC signal. An ac voltmeter may be easily constructed. Simplicity of the circuit and low component count make it particularly....
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A Solid State Relay is in reality not a relay after all. There`s no `relay` found, just the electronics circuit which does the switching. It operates a similar way as a relay; it is possible to use a low voltage to switch a higher voltage or better than....
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Electronic Design has a smart battery charger schematic using only a single transistor. This is interesting as similar circuits now contain simple integrated circuits. When the battery`s charge falls below a threshold voltage, it is automatically recharged....
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is a crystal radio circuit that is simple in design but ineffective in tuning to the medium wave AM broadcast band. Component: Antenna, ....
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In Capacitor Power Supplies we use a Voltage Dropping Capacitor in series with the phase line. An ordinary capacitor should not be used in these applications because Mains Spikes may create holes in dielectric of ordinary capacitors and the capacitor will....
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The circuit of the unit is fairly simple, but is a bit irksome to set up. The reason is that obtaining matched FETs is not easy, so I had to make sure that the circuit would work with off-the-shelf FETs. The phase shifter is a standard opamp circuit, and has....
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I`ve had an interest in building a simple VXO transmitter for many years, but was unsure that the limited tuning range usually associated with VXOs would be useful on the busy HF bands. However, the ability to switch a number of crystals, and cover a number....
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35W switching power supply circuit having a set-top box output is shown in Figure 5. The five-way voltage respectively: Uo1 (+ 30V, 100mA), Uo2 (+ 18V, 550mA), Uo3 (+ 5V, 2.5A)..
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Here is a project Device switching using password by innovative group Dreamlover technology, lets the user to lock their device with password. The block diagram of device switching using password is shown in figure 1. As the circuit device switching using....
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The working and circuit diagram of a low cost amplifier using transistors BC107, and BC148 is explained in detail....
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The shift pulse turns off the conducting scs by reverse biasing the cathode gate. The charge stored on the coupling capacitor then triggers the next stage. An excessively long shift pulse charges up all the capacitors, turning off all stages.
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The Laser1 RoboBrick is a module that is designed to allow the use of a slightly modified laser pointer to detect passive refector beacons at a distance of approximately 10 meters (or about 32 feet for the metrically impaired. ) It is meant to be used in....
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Here is a circuit for simulating breathing / pulsing LED with the 555 timer chip. It became very popular and i received many comments and emails with people that made this circuit and worked fine, as well as comments with people that had troubles converting....
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When the door is opened, SW1 closes, the circuit is powered and the lamp is on. C1 starts charging slowly through R1 and when a voltage of 2/3 the supply is reached at pins #2 and #6 of IC1, the internal comparator changes the state of the flip-flop, the....
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The following circuit shows about Fire alarm circuit diagram With NE555 IC. Features: works as the heat sensor, 10 kilo-ohms resistance of the ....
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Here the simple and low cost FM transmitter circuit. The frequency range of this FM transmitter should be about 89MHz 109MHz. Output power is about 9mW at 9V. R1, R6_12K R2, R4_100K R3_22K R5_1K R7_100R Q1_BC338 Q2_BC548B Microphone JinIn ECM-60P B1....
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These have two coils and are controlled by changing the direction of the current flow through the coils in the proper sequence. These motors have only four wires and cannot be connected to this kit. See our Kit 1406 for a Bipolar Stepper driver Kit. 2.....
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Constructing a robot or should i say a vehicle dat uses 2 motors. I managed to get sum referance regarding d schematics for the circuit design but the current schematics uses a smaller motor. which draws less power and uses a much less power supply. the....
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The following circuit shows about Wiring Diagram and Electrical Circuit Troubleshooting Of 1997 Chevrolet Blazer. Features: powered by a 4. 3-liter Vortec V-6 engine, AM-FM stereo radio with CD, rear wheels moved through a four-speed automatic gearbox, air....
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The laser diode·pulser is a simple drive circuit capable of driving the laser diode with 10-A, 20-ns pulses. For a 0.1 % duty cycle, the repetition rate will be 50 kHz. A complementary emitter follower is used as a driver. Switching speed is determined by....
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When 12V DC from the car battery is applied to the gadget (as indicated byLED1) through switch S1, the circuit goesinto standby mode. LED insideoptocoupler IC1 is lit as its cathode terminalis grounded via the car audio (amplifier)body. As a result, the....
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This is the sequence timer diagram composed by NE555. The timer can set time any time when the power is connected, break and control the external system to work. In the circuit, K1-K3 are relays used to control the corresponding system to work, adjust the....
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A schematic diagram for the remote analyzer is shown. The circuit is powered from a simple 5-V supply, consisting of PL1, 51, T1, abridge rectifier (comprised of Dl through D4), capacitor C1, and a common 5-V regulator, UI. Switch 51 is the on/off control....
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In order to take a high speed photograph one must either have a very fast shutter or light source. We followed the latter course and first examined an commercial flash unit to determine its light profile. This was accomplished by exposing a phototransistor....
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For relatively small (less number of pins than ATmega328) projects, ATtiny series, ATtiny45 or Attiny85 are good choice in terms of its physical size....
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Figure shows a simplified representation of the Earth`s dipole field, it resembles the field due to a bar magnet. The field lines originate at the south magnetic pole and terminate at the north magnetic pole. The angle that this field makes when it....
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In all the houses exist the bells in the door. All want, they have the possibility of being possible to change the intensity, the tone of sound. With this circuit we have this possibility. With the materials round the gates, we can change the sound. For the....