Popular Circuits Page 120
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I managed to break my laptop, by reversing the polarity of a universal power supply. The repair shop diagnosed the problem as a failed motherboard, and asked for ‚¬659 to replace it. I found the price preposterous and the notion of throwing away a....
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Intended for extreme temperature, radiation-hardened environments, this linear supply is capable of supplying 28 Vdc at 125 A from an ac-driven power unit. In operation, power supply output voltage is sensed by the voltage divider consisting of R24 to R28....
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Is slowing Once a primary driver for growth, the adoption of high definition and digital cable service is starting to slow as the numbers of applications on PCs (Skype, magicJack) and smartphones. Even the increased adoption rates of MSO voice. e…§e® Is....
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The circuit is built around an LM339 quad comparator, Ul, which forms the basis of a Schmitt trigger, timer circuit, and a window comparator. One comparator within the LM339 (pins 1, 7, 6), plus LDR1, R4, R5, R6 and R8, is used as a Schmitt trigger. The....
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This variation on my Digital Setting Circles project was created by Craig Combes. He provided the following content so others could recreate his version. Thanks, Craig! Many people use Dave`s serial DSC board with a serial to Bluetooth adapter and that can....
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The following circuit shows about RF amplifier for FM 88-108 MHz with no tune (broadband) Circuit Diagram. This circuit using the BLV10 & ....
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This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
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AT89C51-12PI is a sub package of AT89C51, If you need see the description, please click AT89C51. If you need AT89C51-12PI`s datasheet, please download it from below. By ATMEL Corporation ..
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The intended use of the 24 volts is to power an amplifier that will supply wave forms of up to a couple hundred Hz to bias a varactor or pair of varactors in an RF circuit. This meant that the current requirements would be low - probably a little over a....
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What is the effect of crosstalk from the digital data signals into the clock signal of a data-conversion system? This is a more obscure problem than crosstalk from digital bits into the analog signal path, which was the subject discussed in the previous....
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This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrated LM3909 but has a minor variation of the components used. Naturally the circuit will not be as....
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Works but the windows go slow, you hook 12 volts directly to the motors and they zip up fine. I saw a post from several years ago where someone was trying to use the common 5 pin ice cube relay. never saw anything that said it worked. Anybody know the power....
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The peak detector tracks and holds, using the charge-storing ability of a capacitor, the highest output voltage from a transducer. Initially, the voltage on the inverting input of the comparator is at ground level. As a small voltage (0-5 V) is captured by....
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This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a digital data signal. A digital data signal can be found on the output pin of TSOP-1730 Infrared Receiver, on the Transmit and receive pins of MAX-232 chip (RS-232),....
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10V High-Stability Voltage Source Model power supply. Go to that page to read the explanation about above power supply related circuit diagram...
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The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7 terminals will NOT do. The Alarm is set by pressing a single key. Choose the key you want to use and....
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As shown in FIG inverting gain circuit from the MAX4107 configured as ADC input buffers. Amplifier gain is determined by the ratio of RF and RG, resistors set the gain figure o..
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Although you may well be the proud owner of the very latest NiCd battery charger, you may still come across the odd `incompatible` battery, for example, one having a rare voltage or requiring a much higher charging current than can be supplied by your....
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Control a small DC motor through this H-bridge with an Arduino Uno, but I have never programmed one of these controllers before. I need the motor to rotate in different directions when I press left and right on a keyboard. So far I have this code: // Right....
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We can connect a output of pin 5 on the UM3511-IC to drive a transistor output to emit loud sound out to the speakers directly. For the variable resistor-VR1 act as determine a frequency of the oscillator circuit. When we created successfully. Should be....
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There is only one circuit breaker (no fuses) for the system. If you can follow the schematic, it shows that the switches are used to supply Power (12 volts) and Groundto the window motors in opposite polarities to make the windows go up and down. So we will....
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Inverting mode amplifier is needed by precision accelerometers because that usually charge output device. This amplifier is used to convert charge into voltage....
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This is a simple 12VDC to 220AC inverter circuit that can be used produces an AC output at line frequency and 220AC or different voltage by selecting transformer T1. The 555 IC is configured as a low-frequency oscillator, tunable over the frequency range of....
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This adaptor circuit is essentially a 100mA constant current source. It is applied across a low-value resistor of unknown value (ie, the resistance to be measured) and the resulting voltage drop can then be measured by a digital multimeter (DMM). Setting....
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Voltmeter by the measuring mechanism in a given circle and moving coil in series to configure certain additional resistance. Nl is constant circle, N2 for the moving coil, R., Rz is additional resistance, U1, U2 to limit the amount of voltage...
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Audio metering is present in almost any equipment that plays or records audio from cell phones displaying bar graphs of audio output levels, to home stereos with flashing LEDS, to live broadcasting. There are multiple standards for audio metering that deal....
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When the current is less than the value set, the bias current provided by R1 leads the P3 to be saturated to conduct. And it can not afford to control the current. When the current is greater than or equal to the set value, the pressure drop on R would....
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The LDR`s were hand-picked. Got two packages of them from Radio Shack, looking for at least two pairs of similar parts. Then added wire-wrap pin sockets, to the circuit, so that the LDR`s could be plugged in. Currently, the 0.33UF cap is not being used on my....
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Here is a simple RF bug detector that will help you detect spy bugs and can operate up to 2 GHz. Below are some essential things required for this circuit:....
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A fast electronic fuse designed to operate on 230V AC with an adjustable trip current. When the current through the load exceeds a level determined by the position of the wiper on the 1k wire-wound pot, this circuit cuts off the load immediately. If S1 is....
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This is a simple audio sound level LED display circuit diagram. The circuit is completely based on a single ic LM3915 from National Semiconductor. The LM3915 is a monolithic integrated circuit. It displays the audio sound level in terms of 10 LEDs and....
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This circuit controls very accurately a fan of any size. Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you're all set. The above circuit diagram is for a small 12 volt fan, the size and type....
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The minimum number of supporting components required to build a circuit using AT91SAM7S microcontrollers. This example uses the AT91SAM7S256 ARM7 microcontroller....
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My `89 2.6 outside thermometer (Celsius) has blacked out and I was lucky by finding a good e-bayer who has one.. I bought it but appartently it was....
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The ZN414 is a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti. Receiver CircuitThe TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum. Take....
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The Circuit is the diagram of a simple three band graphic equalizer circuit. An IC called LF 351 IC is used here...
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The input transistor Q2 is an N-channel JFET. Each particular JFET sets a particular output bias voltage, so the JFET must be selected from among multiple devices for the desired bias value. Fortunately, due to the low current involved, desirable devices can....
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This broadband amplifier covers the 225-400 MHz military communications band producing 10 watt RF output power and operating from a 28 volt supply. The amplifier can be used as a driver for higher power devices such as 2N6439 and MRF327. The circuit is....
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Development and production of special touch dimmer integrated circuit, it has a dark, medium, light, take along a touch against the four side light function for zero trigger, h..
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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When connection to PC speaker is plugged in and Telephone connection(bottom-left) is plugged in, I hear humming in the headphones. When only one is plugged in I hear it without distortion. Sound files showing humming. If you criticise my circuitry, add....
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This voltage controlled frequency divider circuit (see figure in text) produces pulses of lower frequency that depends on the control voltage, and front edges of input and output pulses are synchronous. Actually, in this type of frequency dividers are used a....
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The following file contains detail info about design of Clock Oscillator Basic Circuit Diagram. Included in this file information about: selecting the....
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This is Adjustable Constant Current Regulator circuit. This circuit can be used in a bench power supply to prevent the circuit that are tested from being...
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Designed to simulate by electronic means thetossing of a coin, the circuit is based upon a 4049 hex inverter IC, two of which are used. IC1a andIC1b are wired as an astable oscillator, which causes two LEDs D1 and D2 ‰ to alternate rapidly, at a frequency....
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With the recent events at the Fukushima Dai-ichi nuclear power plant, I thought it would be pretty cool to build a Geiger Counter and hook it up to my NerdKit for interfacing with my computer. I`ve found this article which explains the building process....
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As shown in FIG Multiport W723 is being integrated adjustable constant current regulator composition application switching regulator circuit, the output current of 1A. Illustra..
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Mods for JCM900-4100 Note: there are many versions of the schematic for this amp, proceed with caution!! VERIFY which version of the board you have by matching part numbers with the schematics posted...
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The amplifier is based on an integrated circuit TDA2822M. With this circuit can be built amplifier with up to 2 1 W. This much power circuit is able to supply only at peak times, the continuous excitation would not be able uchladit. Involvement of the....
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I use the lm10 IC because it has a reference voltage and that?s useful for dc power supply. With two ICs can take different output voltage and amperage. This circuit is protected from short circuit.P2 is for controlling the current at the range of 0-2A.....
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A roulette wheel electronic circuit can be designed using a 4046 PLL containing a voltage controlled oscillator or VCO, two phase comparators, a source follower, and a Zener diode that is used to produce a low-frequency, pulsed output of about 40 Hz. The....
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This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively i....
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Unfortunately I don`t have a breadboard to try this out on but can modify the PCB. I`ve removed the 1K pot till I can get the strobe working and than....
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This is the latest version of the Improved Infrared Receiver with Status LED which can control any desktop PC with an ordinary remote control. The project comes along with a small PCB in order to save space. It connects to the serial port as stated in the....
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There are two switches: a memory disable switch and a pulse polarity switch. Memory disable is a push-button that resets the memory to the low state when depressed. Pulse polarity is a toggle switch that selects whether the probe responds to a high-level or....
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The 555 Stepper Pulse Generator kit will help you with the pulse required to drive your favorite DC Servo Motor application..
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The world`s first practical crystal amplifying device, in 1948, and the dawn of the commercially available Transistor Radio in Britain. If I had been an average radio enthusiast or constructor at that time then I would have been coming to terms with the new....
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This simple circuit makes it posible to monitor the charging process to a higher level. If you need more information then check out the LM3914 Datasheet. Final adjustsments are simple and the only thing needed is a digital voltmeter for the necessary....
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A quad comparator forms the basis of a frequency detector that is faster and less expensive than more complex versions designed around frequency-to-voltage converter chips. Positive feedback through a 5MO resistor allows the circuit to resolve changes as....
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Structure and working principle c brushless motor windings Structure and working principle of the triangular coils As shown, through the switch, you can make the stator coil ..
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In the presence of smoke or gas, the ac output voltage increases and becomes rectified, filtered and zener-diode coupled (D2 for thresholding) to sensitivity control R3. Under no gas condition, the output equals approximately 0 V (high). When gas is....
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A voltage-controlled oscillator using NE555 The circuit is usually known as a voltage-to-frequency converter as a result of the output frequency will be modified by changing the input voltage. As mentioned in previous blog posts, pin 5 terminal is voltage....
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LEDs provide a convenient way to electronically display information. Although the seven-segment LED display, arranged in the form of the digit 8, is commo....
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The design in Figure 1 is a visible optical link for those who need to see the transmitted data. An isolation figure of more than 5000V is a bonus. Tests of the system used the COM input of a data-acquisition system, as well as a standard PC`s COM port. The....
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A band-width limited amplifies shapes the waveform sampled by the 40 MHz high speed, pipeline Analog to Digital Converter (fast ADC, or fADC). It is well known that the shaping time is twice the time constant (peaking time), per pole of the filter network.....
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Depending on local regulations and the telephone company you happen to be connected to, the voltage on a free telephone line can be anything between 42 and 60 volts. As it happens, that`s sufficient to make a diac conduct and act like a kind of zener diode....
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An 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain, whilst providing a low impedance input to match the speaker. Self DC bias is used allowing for variations in....
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A series capacitor worked best for low impedance loads while a parallel capacitor was used to feed into high impedance loads. Today`s norm is a 50 ohm antenna antenna/coax system requiring a series capacitor. loading adjustment. With SW3 I can switch out the....
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Any stepper motor can be used as a generator. In contrast to other generators, a stepper motor produces a large induced voltage even at low rotational speeds. The type used here, with a DC resistance of 2G—60 per winding, can generate more than 20 V when....
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The design is based on the TubeHobby and is the power supply used in their NC2. I built this very kit as my first nixie tube project, and you can find a review of this excellent kit in the reviews section of my blog. The circuit is a switch-mode power supply....
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This page describes my modifications to the RIG RX-2 receiver which enable it to be controlled remotely from a computer, using an RS-232 serial interface. The modifications are in two parts: some simple additional hardware, and a new firmware program for the....
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The purpose of this prototype unit does away with the need for an oscillator. It offers a mains-derived and fully variable 50 hz AC volts down to millivolts for comparison and to check accuracy, of two or more parallel connected multimeters. Sometimes older....
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2SC2,987,2SA1227 is uPC1342V and two-channel hi-power 80W 2 tubes of the discharge circuit o The circuit uses the same multi-function protection circuit t {PC1237 circuit for f..
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This circuit needs a a Faraday shield, which is connected to 0V.To make this one wrap a tin foil around the coil.and connect to 0v.Then you can use this circuit for find metal.Tune your mw radio until whistle sound comes...
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Take precautions against the coefficient is low, the safety is bad, the applicable space is smaller and smaller. With the development of science and technology, people develop already the intersection of door and magnetic, touch-type, the intersection of....
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This dc voltage doubler circuit produces a voltage that is twice its voltage supply. This is useful when a higher voltage level is needed out of a single lower voltage power supply. Since the current consumption levels are low in such cases, the circuit can....
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1kHz square wave signal source circuit Illustrated is a use CD4060 composed of standard square wave signal source circuit. CD4060 ? foot, foot crystal rr external and compensat..
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PCB is an interactive printed circuit board editor for the X11 window system. PCB includes a rats nest feature, design rule checking, and can provide industry standard RS-274-X (Gerber), NC drill, and centroid data (X-Y data) output for use in the board....
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The Pulsed Multiple Gas (PMG) laser described in this chapter is very similar in many ways to the Home-Built Pulsed Argon and/or Krypton (Ar/Kr) Ion Laser from Scientific American. However, the developers of the PMG laser have also used it with xenon (Xe)....
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This Adjustable Strobe Light is the bigger brother of the plain old strobe light. This one uses a much more powerful "horse shoe" Xenon tube which produces more light. You can also control the flash rate up to about 20Hz. Do not look directly at the flash....
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Avramenko is a Russian scientist and invented the plug shown in Fig. 1 to transmit electrical energy over a single wire. It’s a simple circuit consisting of two diodes, one capacitor, and a flash tube. The high-voltage (HV) terminal is connected to the HV....
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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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Here is my home-made kit of ATmega32 microcontroller interfacing. The ATmega32 controller is rich with features like onboard 32kB in-System programmable flash, 1 KB EEPROM, 2KB SRAM, 10bit ADC (8 channel), SPI bus inteface, TWI (compatible with I2C bus)....
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I need someone to look at this. I designed this H-Bridge to run a 12VDC, 6 Amp motor. It worked great on the breadboard at 7.2 VDC running a small DC....
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The dimmer circuit in Figure 1 can change the intensity of the light from zero to maximum. The dimmer operates at approximately 12V, unlike the usual ones that function by adjusting the firing angle of the 110 or 220V mains supply.
The dimmer works to....
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Simple few transistors generator and transformer A transforms 1. 5V battery voltage to few hundred of volts. This is quite high voltage. Then this high-voltage current passes through a diode, which rectifies current to DC. This DC current is stored in quite....
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Electronics Tutorial about Combinational Logic Circuits that use Logic Gates to make Multiplexers, Encoders and Solid State Switches....