Popular Circuits Page 214
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As friends many take an interest the circuit about IC 555 which be integrated highly popular that circuit. I then lead the circuit sets the time be Basic...
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Circuit diagram is very simple and works as follows: N1 Schmitt trigger works as an oscillator and produce a frequency of about 1 kHz. If in the tank is still enough water, then alternative voltage go from electrode A to electrode C. After rectified of....
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Electronics Tutorial about Active Band Pass Filter including Band Pass Filter Frequency Response, its Resonant Frequency and Second Order Response....
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Fluorescent tubes use far less energy than incandescent lamps and fluorescent tubes last a great deal longer as well. Other advantages are diffuse, glare-free lighting and low heat output. For these reasons, fluorescent lighting is the natural choice in....
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The capacitor charges until the PNP transistor (here shown as a 2N3906, but you could also use a BC327) receives base current through the Zener and turns on. Then the NPN transistor (here shown as a 2N3904, but you could also use a BC337) turns on and....
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This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the....
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The triac is another three-terminal ac switch that is triggered into conduction when a low-energy signal is applied to its gate terminal. Unlike the SCR, the triac conducts in either direction when turned on. The triac also differs from the SCR in that....
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Adopted operation amplifier can obtain constant voltage source with high amplification factor and large load current, when the circuit parameter has great change, the output voltage still have high precision. The output current limit is undertaken by T3, T4....
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The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and....
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The current Milwaukee Guitar design uses an off-board computer (a desktop PC) to control the servomotors. A standard USB number pad is connected to the computer which then provides output signals through a Velleman K8055 USB experiment interface board to the....
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High quality mono audio amplifier circuit. This amplifier is built on the classic symmetrical scheme with output stage operates in class AB and has a pretty good sound, with no complicated setup and scarce components. ..
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Hi all, I just notice that this 12v switching power supply schematic is hot, some people discuss it in top forum like dp.12v Switching Power Supply....
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This circuit enables you to test quartz resonators at the range values from 32kHz to 24MHz. Confirmation of good state of quartz resonator is done by diode signalling LED and acoustic signal. Switch S2 enables change of range...
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If you feel that somebody is tampering with your telephone line you might find this little circuit useful. It detects if there is another telephone connected to the line, if there is a short or an open line. Sound and a flashing light will tell you which is....
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15V active servo power supply circuit ..
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This is some what different concept But here I have used very simple method. Most of people in the world find UFOs by looking at the sky most of time we can see some rich people buy cameras and focus them to the sky. But those unites are so expensive here I....
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A Float Switch is a device which is typically used to measure the depth/level of liquid in a container. As the water rises and reaches the level of the float switch, it begins to float going from the vertical to the horizontal. This closes an internal switch....
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This circuit uses two comparator pairs from an LM339N quad comparator; one pair drives the yellow positive (+)and negative (-)indicators, the other jointly drives the red warn LED3. The circuit draws its power from the unregulated portion of the power....
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Transistor RC phase shift oscillator . RC phase shift oscillator using opamp. RC phase shift network. Theory and working principle. circuit diagram....
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Many TOPSwitch TOP223 flyback power supply applications require two or more outputs to supply a variety of secondary circuits. Typical consumer applications of these multiple output converters include Television and related products such as set- top decoders....
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As shown in FIG adaptive adjustable power supply. The power supply to the LM317 regulator device, adaptive switching circuit automatically switches the input voltage according ..
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U20 is a 556 timer configured as a one shot multivibrator. The output pulse width is determined by the size of R34 and C24. Pulse width = 1. 1 x R34 x C24 =. 5 seconds. The output on pin 9 is "high" active. The output of U8 is "low" active. Reset initializes....
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This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. T...
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This is a schmitt trigger circuit. This circuit produces a simple comparator action. It is `emitter coupled`. This circuit has a distinct hysteresis loop and....
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This is the unexpurgated, pre-edited version of the article "Improved Anode-Circuit Parasitic-Suppression For Modern Amplifier-Tubes" that appeared on page 36 in the October 1988 issue of QST. A more recent treatment of the subject appeared in the September....
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Adding negative feedback to an amplifier, especially a vacuum tube amp is not as easy as it may seem. What is there to it Just connect a resistor from the secondary of the output transformer back to the cathode of the pre phase inverter tube. Right Not so....
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This is a simple single zone home Alarms Systems circuit. Its features include Entry delays, a timed Siren Cut-Off and and automatic Exit. It`s designed to be used with the usual types of normally-closed input devices such as - - foil tape - micro switches -....
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One of the simplest ways to make a battery powered High Voltage power supply is to use a common car ignition coil. Ignition coils are a type of induction transformer based on the Tesla Coil invented by Nikola Tesla in 1891. The voltage rise is not given by....
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If the green LED is on, the slave MCU is enabled. The MAX690 keeps the memory contents during power off. No resouces of the slave MCU are used. Wenn a SAB-C515 is used, it is possible to develop programs for the AT89-family easily by changing simply the port....
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A Wien bridge oscillator produces sine waves with very low distortion level. The Wien bridge oscillator produces zero phase shift at only one frequency (f=1/2 RC) which will be the oscillation frequency. Stable oscillation can occur only if the loop gain....
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The software sample is written in C for a specific application. A general purpose interface is not available at this time but is planned for the future. The information detailed here should provide the basic framework for designing and implementing your I2C....
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If you are looking for a digital light sensor that is able to measure the intensity of light and easy interface with a microcontroller, Intersil ISL29001 is one such device ..
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The frequency of a crystal-controlled oscillator is held constant to a high degree of accuracy by the use of a quartz crystal. The frequency depends almost entirely on the dimensions of the crystal (essentially its thickness); other circuit values have....
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This discussion covers 3 different Xenon flashing circuits from disposable cameras. From them, you will learn circuit tricks that have NEVER been shown in any theory book.The first circuit covers 6 BUILDING BLOCKS.You will need an old disposable Flash Camera....
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A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector....
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This supply is powered by a transformer operating from 120 Vac on the primary and providing approximately 20 Vac on the primary, and providing approximately 20 Vac on the secondary. Four 10-A diodes with a 100 PIV rating are used in a full-wave bridge....
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This is circuit Function Generater,Triangle and Squarewave Generator. Use IC 40106 and Transistor BC547. VR1 For Control frequency Output. S3 to Seclector...
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In some cases of temperature measurements, it is more advantageous to convert the measured value into a frequency than into a voltage. A temperature to frequency converter can be directly connected to a frequency counter or it can be connected to a computer....
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220V mains electricity sent through 0.33 u F (Ci). ] 50kn ohmic drop Sui, Di - D4 bridge circuit composed of rectifier. After 100 u F capacitor filter technology,: [born about ..
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The HllC supplies the de latching relay function and reverse polarity blocking, for currents up to 300 mA, depending on ambient temperature. For de use, the gate cathode resistor can be supplemented by a capacitor to minimize transient and dV/dt....
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This characterization circuit, plus a PC and some software, accurately measures the full discharge cycle for a rechargeable AA cell. Cell capacity and output resistance can easily be determined from the curve resulting from these measurements. Rechargeable....
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The excavator is Mitsubishi MS280. The problem is they are not sure how to excite the pump, I want to put an electronic proportional control valve in the old girl. If your familiar with this era of Mitsubishi`s could you let me know and I will give you as....
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Low-cost microprocessor supervisors reset controllers when power-supply voltages fall below given levels. As added protection, you can also reset the microcontroller when the power supply is too high by combining a low-cost shunt-voltage regulator with a....
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The following circuit shows about Battery Powered Burglar Alarm Sensor Circuit. Features: foil tape and PIRs, such as magnetic-reed contacts, ....
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The SM5021 series are crystal Oscillator module ICs fabricated in NPCs Molybdenum-gate CMOS, that incorporate high-frequency, low current consumption Oscillator and output Buffer circuits. Highly accurate thin-lm feedback resistors and high-frequency....
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This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light...
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Electronic circuits are presented in schematic form. A schematic is really a map showing the path the current takes through the various componenets. Each component is represented by a symbol, usually with either a label or a value (or both). The arangement....
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Lightning Activated Camera Shutter Trigger. This picture was taken using the circuit. This circuit is used to trigger a camera`s electronic shutter circuit when a flash of...
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When a discharged gel cell is connected, the charger goes into a fast charge mode at a fixed rate of 400 ma. After the chip detects the voltage leveling off or when 4 1/2 hours has elapsed. (which ever happens first.) the fast charge will stop. After the....
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The LM317L and resistor act as a current regulator set to 40ma. Current flows from the battery through one pair of LEDs, through the regulator, through the other pair of LEDs, and back to the battery. The capacitor filters out noise on the power supply....
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The persona] message recorder is built around an ISD1016 CMOS voicc messaging system, which does away with the cumbersome and expensive analog-to-digital and digital-to-analog conversion circuits. A functional block diagram of the ISD1016 is shown. The....
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Double r circuit consists of three resistors, three capacitors, substantially symmetrical double insanity single passive attenuation characteristics of the filter element 0 0.2..
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When ever you need to get an alarm or intimation after ten minutes, the circuit shown below can be used. The circuit is nothing but a monostable multivibrator based on IC NE 555. When ever you press the reset push button the green LED D1 glows after 10....
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My particular favourite was the MC145152-2 that could be programmed with DIP switches, a diode matrix, or even a pair of EPROM look-up tables. But sadly, those days are over. The MC145152-2 costs about US$30, if you can find a supplier. Today we need to use....
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After this circuit can compensate for additional LP recorder function defects in image quality. Television signal frequency component reflects details of the screen, as will be..
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I leave it to the reader to supply their own power supply. I am using a supply from an old external SCSI drive. My cutter runs from the five volt supply and 25cm of nichrome wire pulls about 900mA or 4.5 watts. That is actually running a little hot and I....
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This mobile phone repair tutorial, only applicable if after replacing a good LCD replacement or rest assured that the LCD screen is working fine but the display problem still exists. If the LCD connector is seemingly okay and the quickest method is to....
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ICL7135 Typical Application Schematic Diagram appears in the following circuit illustration. This A/D (Analog to Digital) converter with all necessary active devices are contained on a single CMOS IC such multiplexed BCD output and digit drivers..
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A 1999 Pontiac Montana. The information console that shows temperature, MPG, compass, etc. failed off and on for a few days before finally dying. At the same time, the radio display failed. The radio works just fine. The display can be read if you shine a....
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At this point you whistle into the receiver and the Infinity Bug will pick up the line. The high-gain amplifier in the Infinity Bug will pick up the audio at the place where it is located. It can only be assembled on the PC board supplied in the kit as the....
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When power is applied to the circuit, SCRl is off, so there is no bias-current path to ground; thus, L~317 acts as a current regulator. The LM317 is umnected to the battery through steering diode Dl, limiting resistor Rl, and bias resistor R2. The....
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VDI, VD2, C3, C4 compose a simple half-wave rectifier capacitor step-down regulator circuit. After power across C3 can output 12V DC voltage of about, for the time base circuit electricity...
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The 15 w class B audio amplifier circuit shown here is a simple class B audio amplifier based on TL082 op amp, TIP41 and TIP42 transistors. LM833 is a dual amplifier with high scanning speed and low distortion designed specifically for audio applications.....
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This is a FM transmitter circuit diagram. This circuit using 2N2222 Transistor so can be operated with 3V, and also can send signals up to 50m ....
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The resistors in the output lines are included to isolate reflections from unterminated lines. If the line characteristics are known, the resistors can be deleted. To meet NTSC gain-phase requirements, a small-value boost resistor is used. Figures 3-27B and....
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Circuit works The liquid level automatic controller circuit from the power circuit, a level detection circuit and control the implementation of circuit, as shown in FIG. FIG automatic level control ..
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In a basic astable timer, configuration timing periods 11 and 12 are not controlled independently. The lack of control makes it difficult to maintain a constant period, T, if either 11 or 12 is varied. In this circuit, charge RAB and discharge R8 c....
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As shown in FIG constituted by RF2324 1880MHz internal amplifier collector bias application circuit. Radio frequency (RF) signal from the input pin 3, via a preamplifier, after..
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Circuit shown in Figure 3-13. Figure, RC surge absorption circuit is, R, zinc oxide varistors (such as MY31 type, MYH12 type, MYH20 type, etc.), an overvoltage protection devic..
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This circuit shows the adjustable regulator circuit is conjunction with a voltage regulator, but on this circuit using the LM117 regulator of alternative flows in addition to providing a reference, not a diode LM113. Both regulators currently require a....
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This circuit will explain the PLL controller unit for the FM transmitter. It is very important since the transmitter frequency is digitally controlled and thereby very stable. The heart of this unit is a PIC processor called PIC16F870, a 2 x 16 char display....
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For those of us who don t like to get their hands dirty, this simple soil moisture tester quickly checks the state of their plants and how much attention t....
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The ADP1649 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in....
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When SI (sensor) is closed, power is applied to U2, a dual timer. After a time determined by C2, CI is ene..
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Use of IR (infrared) light as a method for wireless communication has become popular
for remote control applications. There are a number of different standards for such
communication. In this application note the widely used RC5 coding scheme from
Philips....
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Clipping is one of the main problems that causes distortion in amplifiers. It causes the amplitude level of a waveform to drop suddenly before it reaches the limit that it was supposed to reach. Well, here is a simple circuit that will help to detect the....
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To take advantage of sunlight shining on the earth can continue to be utilized to serve as a power source so that we can at least save on electricity prices continuing to rise, below is one of a series of simple power plant can be created and used to fill....
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This battery charger circuit can be used to charge one or more batteries with the total nominal voltage of 12 V, meaning ten NiCd battery or six 2 V lead a....
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The foot 13 between valve value 1 and valve value 2 will suck the transistor base current. If relay releases, after recovery time 0.5s, to press key then it will start to switch process again. The timer is composed ofwindow discriminator TCA965 to. After....
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The metal detectors can be classified according to their principle of operation in those three categories: BFO, TR/IB and PI. Each of these methods has advantages as well as disadvantages. The ideal metal detector (do not look for it because it does not....
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Portable electronic devices operating from one or more
alkaline or nickel-metal-hydride cells require a boosted
supply that is both small and efficient. Linear Technologys
new LTC®3401 and LTC3402 are high frequency
micropower synchronous boost....
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Normally home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting. The circuit described here requires no physical contact for operating the appliance. You just need....
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Just ran a +12V switched wire back to the camera wiring and connected it to the same place that the reverse lights connect. That way, either the reverse lights or my switch can enable the camera. The important thing here is the use of diodes! These are used....
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Two pairs of MOSFETs form a bridge that alternately switches current in opposite directions. Two parallel-resonant LC circuits complete the converter. The Ll/C1 combination is resonant at the fundamental frequency; the L2/C2 combination is resonant at the....
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The Colpitts Oscillator is characterised by tapping the mid-point of the capacitive side of the oscillator section. The inductor can be the primary side of a speaker transformer. The feedback comes via the inductor....
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Mechanical contacts have the disadvantage that they wear out. That is why it is practical to use an electronic ‘touch switch in some situations. With suc....
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There was a discussion on synth-diy a while ago about the problems of building a voltage controlled oscillator with a sawtooth wave output whose duty cycle (the ratio of ramp-up time to ramp-down time) is adjustable with a seperate control voltage. [Don:....
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Channell is wired as a conventional integrator, and channel2 as a voltage follower. When channel2 is switched on, the output will follow VJN and C will discharge to maintain 0 V across it. When channel! is then switched on, the output will initially be at....
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The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
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Automatic gain control is a very useful feature in a number of audio amplifier circuits: tape recorders, telephone speaker phones, communication systems and PA systems. This circuit consists of a HA-5144 quad op amp and a FET transistor used as a....
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Quick Key Adapter, 10 Button HID Keyboard This Instructable covers creating a USB connected Human Interface Device Keyboard that has 10 button inputs which....
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This article is the result of the very positive feedback on the hardware articles that I have written so far. You LinuxFocus readers are really a great audience! Some of you wanted to know how to interface the USB bus. So here is a nice solution. We use the....