Popular Circuits Page 100
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The lighting hood of AquaOne AR-320 tank. These small tanks generally come with crappy tubes with low power output and an algae-friendly colour spectrum. There are numerous ways to improve the lighting such as replacing the hood with a metal halide pendant,....
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Figure 4-52 (a) for the two-phase wiring, DC operation; Figure 4r52 (b) for the two-phase current differential wiring, AC operation. ..
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The A2060H is an H-Bridge extension for the Programmable Logic Head ( A2060 ). With the help of an external power supply to provide the motor current, the A2060H provides variable-speed, bi-directional drive to DC motors. The motors can operate at anywhere....
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Burned out some resistors on the circuit board of my Roland KC-300 amp and they are so black that I can`t tell what they are. What kind of resistor is R82, R83, R85, R92, and R93 If R92 and 93 continue to get really hot. you may have something pulling too....
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The unit described here is simple to build, and can be quite small. The picture below shows the prototype, in a box 175mm wide, 210mm deep and 55mm high. The single circuit board is 140 x 90mm, so there's plenty of room inside for another board (a local....
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The ADC12038 families are 12-bit plus sign sampling ADC converters with serial I/O. These devices have configurable Analog multiplexers with 2, 4, or 8 input channels. On re- quest, these A/Ds perform a self calibration routine that minimizes linearity,....
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This Project can be used in home, shops, offices etc. It keeps tracking of both Incoming and Outgoing Calls. It has a built in Caller ID. The incoming and the dialed numbers are displayed on the LCD display. The system will display the numbers over the LCD....
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The capability to determine which part of the tape is empty and which part has a recorded data can help accelerate your work of looking for a certain program. The circuit uses a tone decoder IC 567 and a timer IC 555. The 567 IC decodes the pilot tone of....
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TDA4935 is bipolar stereo amplifier IC that can be wired as a 2X15W stereo amplifier or a 30W mono BTL amplifier. The IC also features built in circuitry for over load protection and over temperature shut down. Here the IC is wired in stereo mode in order to....
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This two-stage design makes use of enhancement-mode pHEMT device technology to serve IEEE 802.11a, HiperLAN2, and HiSWANa local-area-network receivers....
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A simple usb LED lamp circuit using 5 volts power supply from usb port, which can be used to light a desktop or laptop computer during power failure....
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Use the circuit shown we can reverse or flip the switch amplification without inversion. Voltage gain depending on the position of the switch. This may be +1 or -1. Changing circuit has two versions, A and B. I personally prefer B..
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The article on my RGB LED fader has been one of the most-visited articles on this blog. Since posting it, I`ve designed and built another microcontroller-based RGB LED project, this time controlling the colors from the computer over USB. The AVR needs to be....
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I went with electric because it`s quieter, not smelly and I can carry it up a flight of stairs. I chose the conversion kit made by Currie. Factory service is nonexistent, but EVdeals is a good, knowledgeable dealer. The motor delivers more than ½ horsepower....
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The Frequency instability in VFO stage is a common problem. This is usually occurred in VFO`s due to low Q of the tank circuit, capacitors real value, power supply regulation, stray capacitance, lead inductances and over feed back levels etc. Few months....
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This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and....
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Ql and Q2 switch the primary windings of transformer Tl via a square wave at a frequency determined by its magnetic properties. Diodes Dl and D2 provide base return paths for the feedback current of Ql and Q2. The output winding of T1 is connected to a....
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So you`re either revved up about building one of these for yourself or you`re just reading on because you`ve nothing better to do. I can understand that. So let`s begin with a set of schematics: Don`t be confused by this - it`s your basic 555 timer....
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Where there is heat, let us bring cooling: a fan will do the job, but unfortunately fans are usually noisy. In many cases there is no need for the fan to run continuously at full speed, and so it makes sense to control the fan speed in response to the....
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This is a discussion on Trying to build an Ambilight within the Electronics forums, part of the Tech Support Forum category. Hey there, I was recently looking at back lighting lights/LED`s for behind monitors. and I came across a thing called I was recently....
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The emergency driver unit consists of a battery charger and electronic circuitry in one compact case. The batteries. Emergency lighting battery protection from over current and heat. Liquid. Crystal Display. (LCD) screen protection from short circuit and....
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Circuit diagram in the research and design features, are applied on the mobile robot. Therefore the study design systems to take into account small size, low power, easy to mov..
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Shown for the XTR108 three-wire RTD connection circuit. Sensor connection RTD lead resistance may introduce errors. Using the figure ..
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A Very Low Current, High Voltage Spark, that is "Manually Triggered". Although its not easily Measured, the Peak Ouput voltage will be over 5,000 Volts. T1 is a small audio transformer and it steps up the voltage to about 500 Volts at Point "X" on the....
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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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A multivibrator which generates square waves of its own (i. e without any external trigger pulse) is known as astable multivibrator. It is also called free ramming multivibrator. It has no stable state but only two quasi-stable (half-stable) makes....
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Making yourself an alarm is both useful and interesting: but the best part is when you take the remote control out of your pocket, and switch on the alarm while saying to your friends: "I`ve done it in a weekend". Making yourself an alarm gives you maximum....
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The figure is a schematic circuit of UV sensor. When UV sensor is coupled by voltage between the cathode and anode, and the UV radiation gets through the quartz glass tube on the cathode of the optical surface, because of the cathode material coated with....
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Many record players unfortunately exhibit two undesired side effects: rumble (noise caused by the motor and the turntable) and other low-frequency spurious signals. The active high-pass Chebyshev filter presented here was designed to suppress those noises.....
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Conventionally a MOSFET with a voltage rating of 1500V or with a Half-Bridge connection using two MOSFETs of 800-900V, would be used for SMPS applications requiring input voltages higher than 380Vac. However, these methods have the disadvantages of a....
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The transistors form a differential pair with an active current-source tail. This configuration, known technically as a variable-transconductance multiplier, has an output proportional to the product of the two input signals. Multiplication occurs due to the....
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Sustainable satellite 802.11b wireless internetwork and how it was achieved...
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This white-LED driver circuit is ideal for use in a garden light. It automatically turns the LED on at night and runs from a single 1. 2V nicad cell which is recharged by a solar cell during the day. The prototype used the existing casing and solar cell from....
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This is 10.7-MHz IF amplifier circuit. This circuit is used in many application such as cell phone base station receivers (final IF) and FM broadcast receivers..
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The circuit is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified fence generator. T....
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PLL synthesizer oscillator circuit is a feedback loop composed of reference oscillator, phase comparator, loop filter, voltage controlled oscillator, programmable frequency divider and other components. In the circuit, the reference oscillator uses a crystal....
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This circuit is a simple IR detector for testing IR remote controllers. The circuit is based on one phototransistor which receives the IR beam. The NPN transistor works as an amplifier which feeds current to the led. When this circuit detects IR or light,....
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Binu submitted a new resource: Circuit and Program to Interface MT8870 with AT89S51 (version 1.0) - Decoding the DTMF signals from the telephone line ....
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The circuit I used is a very common one. You can do a google search for 555 timer LED blinker and find hundreds of schematis that will fit the bill. Here is the schematic for my particular flavor of LED blinker: The variable resistor (100K) in the....
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If you`re just building a dual stand-alone preamplifier (as for, say, a stereo magnetic phono preamp), your power supply requirements will of course be greatly reduced. Figure 5A shows a simple supply using readily-available 12 volt, 1/2 ampere transformers....
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When entering the power supply 9-volt circuit IC1 number LM386 amplifier IC size is 300-800 mW, Depending on the power supply circuit with, This is from 4-15 volts. Once entered into the input pin 3, The non inverting pin to amplifier non-return phase. C1....
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The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit which can be applied in car radio, TV and audio systems. Loudness compensation to....
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220V AC voltage through a capacitor C] buck, rectifier bridge pile UR were barrier-wave rectifier, filter capacitor Cz, after the Zener diode voltage into DC voltage. Photoresi..
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Hello, everyone, new kid on the block here After some tube amp reparations, fixes and minor upgrades (re-capping, fixing bias problems, various....
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The IC LM338 by TEXAS INSTRUMENTS, is a versatile IC which can be wired in numerous different ways for obtaining high quality power supply circuit configuartions. The first circuit shows the typical wiring format done around the IC. The circuit provides an....
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Mobile phone chargers available in the market are quite expensive. The circuit presented here comes as a low-cost alternative to charge mobile telephones/battery packs with a rating of 7.2 volts....
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A very simple supercapacitor charger electronic project can be designed using the LTC3625 IC designed by Linear technology to charge two supercapacitors in series to a fixed output voltage (4. 8V/5. 3V or 4V/4. 5V selectable) from a 2. 7V to 5. 5V input....
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Because light is at such a high frequency in the electromagnetic spectrum, it`s an even better medium for communications than radio waves. Lasers are perfect instruments for communications links because they emit a powerful, slender beam that`s least....
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With all DHT stages (all tubes from Svetlana 1970-s). OK, the input/splitter are not DHT`s but DHP`s - 4P1L - triode wired. Mullard 3-tube input/splitter topology, cap-coupled to cathode bias 6B4G PP. First stage uses battery bias (no cathode resistor). Only....
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In this tutorial, I will show you how to write a very simple program. I am assuming that you have written ladder logic before, and that you have some basic familiarity with microcontrollers, but that you have never used LDmicro. If you don`t know very much....
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This time delay switch circuit is useful to switch on an AC load such as lamps after the delay of three minutes. This protects the load from inrush current and transients at power on which may be detrimental to the device. The time delay switch is directly....
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The circuit will provide 3 preset currents which will remain constant despite variations of ambient temperature or line voltage. ZDl produces-a temperature stable reference voltage which is applied to the noninverting input of ICl. 100% feedback is applied....
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The electronic darkroom timer is built around a 555 oscillator/timer, a pair of general-purpose transistors, a buzzer, and an LED. The 555 (Ul) is configured as an astable multivibrator (free-running oscillator). The frequency of the oscillator is....
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I have been given the following circuit diagram and have been asked to compute R2 and RC such that, at the Q-point, the circuit will behave as follows: VCE=5V VBE=0.7V IC=2mA β=100(where β=ic/ib)..
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To design a Tube Headphone Amplifier we need a triode with uncommon characteristics: enough voltage gain, low internal resistance and good anodic current. My first test was done with the E182CC (figure 1), but there is the limitation on the usable impedance....
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Is the use of Shenzhen Skywave Semiconductor Co., Ltd. of M] DOOI, five flash integrated circuit fabrication Shen Rd flashing lights controller,..
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This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusuable in....
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The 555 timer produces a rapid series of pulses whenever switch SI is open. These pulses are counted in groups of 16 and converted into binary form by the 7493 and applied to the 74154 (a l-of-16 decoder/demultiplexer) wired so that each of its 16 output....
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An internally compensated operational amplifier is described which has been fabricated using n-channel Al-gate MOS technology. Only enhancement mode devices are used, and the circuit has been designed so that its performance is insensitive to process....
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This audio peak detector allows a pair of stereo channels to be monitored on a single LED. Identical circuitry is used in the left and right channels. Use....
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This low-cost burglar alarm employs a 12V strobe light and a truck reversing horn as the visible and audible alarm outputs while the alarm itself is a 12V horn relay and some pressure mat switches. This simple approach has the benefit that the alarm....
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This LM10 circuit can be used as low voltage low current voltage source or reference. This circuit regulate the voltage from the power supply to give a very....
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This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes....
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This self-biasing configuration is useful any time srnall changes in light level must be detected, for example, when monitoring very low flow rates by counting drops of fluid. In this bias method, the photodarlington is de bias stabilized by feedback from....
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A very interesting schematic of Flip flop LED flashing circuit. The circuit actually is an astable multivibrator which starts blinking LEDs one by one when power is applied. This LED flasher circuit can be operated with any voltage from 6 to 12 volts, you....
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Photovoltaic (PV) is the field of technology and research related to the application of solar cells for energy by converting sunlight directly into electricity. The following Photovoltaic Power System manual is a suggested practices manual examines the....
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When driving MOSPOWER in a totem-pole output configuration, it is necessary to have the gate voltage 10 to 15 V positive with respect to the source in order to handle load currents near the MOSPOWER maximum ratings. The D169 lends itself to....
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Barrier measurement of distance method applied is with measuring strength of bound signal. Reflection wave is catch with an acceptor transducer. Acceptor transducer releases sine signal which the amplitude depended from barrier distance with transducer.....
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Circuit shown in FIG. Circuit by the battery, the controller, with electrical and charging parts. Wherein: Zener diode DWl, resistors R1, R2 composition undervoltage detection ..
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A feast with enough delay lamp circuit is very suitable for use on the bedside table, which is characterized by a button SB, lights; then click the lights off; If the lights do..
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This water level sensor (detector) circuit uses a standard NAND logic gate to produce oscillation and to detect the water level. Oscillation is included inside....
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This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit will....
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Many of today`s designs use low-cost microcontrollers from Freescale and Microchip, but during the last decade, device packages have resorted to ever-smaller footprints featuring as few as eight or even six pins. Although these packages minimize pc-board....
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This is a simple surround sound decoder. Left & right outputs of a stereo tape or CD player can be connected to the circuit inputs and 4 outputs of the circuit can be connected to a surround power amplifier or 2 stereo power amplifier. ..
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This two-transistor white noise generator has a surprising feature about 30dB more noise than the more traditional designs. Q1 and Q2 can be any small-signal transistors with a beta of up to 400. The reverse-biased emitter-base junction of Q1 provides the....
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Hi! I desperately need help concerning the circuits I`ve attached below. Basically, it is an ultrasonic receiver circuit, with two ultrasonic....
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The circuit is an open loop rms voltage regulator that will provide 500 watts of power at 90 V rms with good regulation for an input voltage range of 110-130 V rms. With the input voltage applied, capacitor Cl charges until the firing point of Q3 is reached....
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The Geiger counter is a scientific instrument that can detect ionising radiation such as alpha and beta particles and gamma rays. It`s capable of detecting a single particle and although relatively simple is thus exquisitely sensitive [1]. Radioactivity was....
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Has high input impedance und low output impedance, to reduce droop in output voltage between pulses. Staircase is generated by pump D2-C2, which is boostrapped on output to maintain equal amplitude on each step. Circuit values shown give 10 steps with 12-V....
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This 5 volts Switch Mode Power Supply circuit use the IC from National Semiconductor has been producing and designing ICs for use in switch-mode power supp...
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This is the circuit diagram of a 3A adjustable power supply using IC LM350K. LM350K is a very rugged voltage regulator IC with features like thermal regulation, short circuit protection etc. This circuit is designed as per the application notes in the data....
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Many electronic circuits related to fan speed controlling have been published here and this one is just another approach. The circuit diagram shown here is of 12V DC fan speed controller using the IC LM2941CT which is a low drop out 1A voltage regulator. The....
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Mainly used for single-shot timing shaping and delay and so on. By a monostable trigger circuit 555 of integrated circuits..
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The first power amplifier circuit shown in Figure 5-88. Using the "op amp of the Emperor" NE5: 5 32 5 times for line amplifiers, power amp choice Manifold TDAI5210 TDA1521 fidelity OCL dual power supply, the output of this circuit eliminates ..
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Penetrate the motor phase line with a transformer when the induced voltage is ov. When one phase or two-phase or three-phase serious imbalance, transformer induced voltage rises rapidly, resulting in the transistor base current after rectified immediately..
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I Specifically Designed this circuit to charge 2 Batteries for my Digital Cameras, but it can be modified to charge 3, 4, 5 or more cell. However, It will Not Work with only One Cell as that voltage is too low for even this LDR Discharge Regulator. If you....
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The three major types of current-limit-protection mechanisms are constant, foldback, and hiccup. Hiccup current limit performs the best of the three types; however, the implementation is rather complex. In this scheme, upon detection of an overcurrent event,....