New Circuits Page 177
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This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen. When power supply is restored,....
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Advantages and disadvantages of different power supply technologies as well as the design considerations involved in choosing and evaluating a mains transformer. The pros and cons of external supplies, inrush current control, RF emissions from bridge....
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and C code for a PIC frequency counter operating up to about 50MHz. The project uses an HD47880 LCD for the display and uses timer 1 to count edges of the input signal....
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Schematic diagram and description of 2 watt audio amplifier circuit using TDA7052 amplifier IC. This is a super simple audio amplifier circuit. ....
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In this tutorial we can get information related to sensor amplifier, schematic, and noise. This tutorial presents discussion around sensor, output, and....
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As time goes by, microcontrollers become more powerful, cheaper, and smaller. A typical micro of the past could have had 40 pins and no internal memory. On the contrary, modern J-series PICs are made with 96K program memory and 28 pins. We can drive a lot of....
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When you are using LCD in 4 bit mode you have to send data two times where in 8 bit mode you only have to write once, this ultimately keeps your microcontroller more busy with LCD. If you are doing only a few things with your microcontroller then its ok you....
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Tone controls are something of a no-no in high-price audio. But what is a high-price audio cable but a high-price tone control? Now, you can buy or....
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The ISL62381, ISL62382, ISL62383, ISL62381C, ISL62382C and ISL62383C family of controllers generate supply voltages for battery-powered systems. These controllers include two pulse-width modulation (PWM) controllers, adjustable from 0. 6V to 5. 5V, and two....
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This topic covers a resonant equalizer which is a different style circuit than the common audio equalizer, although both produce the same result. The difference here is that the frequency response of both the high and low frequency equalizer covered on the....
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Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This litt...
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This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit. This is a circuit that I`ve build a few years ago for a friend, who....
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If you`re a biker or scooter rider you`ll know how easy it is to forget to cancel your flashing indicators after turning without an audible reminder. Constantly glancing at indicator lamps is hardly an option; your eyes should be on the road ahead! The....
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SUMMARY This circuit is one of the most basic and popular sensor modules. In electronics, this sensor is analogous to human s visionary senses which can be used....
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The power controller module used in the system takes input directly from a momentary switch and uses that to toggle a relay that passes mains power to the system’s transformers. The controller circuit operates at 12V and as I understand was chosen to allow a....
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Some relays will become warm if they remain energized for some time. The circuit shown here will actuate the relay as before but then reduce the hold` current through the relay coil current by about 50%, thus considerably reducing the amount of heat....
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I am using this Class A Amplifier with a 12AU7 based valve preamp. It produces the most purest sound. I have no idea of distortion levels etc. but it has a very fine grain and delicately textured quality. With only one watt of output efficient speakers must....
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The advantage of synchronous reception of AM signals is widely known. It includes high selectivity, linearity of detection and a low noise level at the output compared to other ways of reception. The circuit diagram is shown in figure 1. The operation of the....
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This is ultrasonic proximity detector circuit. This circuit consist of micropower opamp and a pair of matched piezo-ceramic tranducers. It uses a 9V battery as....
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In the generalused switching stabilized voltage supply, it can use theresonantswitch to replace the step-down convertor`s shape, and that is the resonant converter circuit. The diagram shows the example of changing step-down convertor to resonant converter:....
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This car alarm circuit features Exit and Entry delays, an instant alarm zone, an intermittent siren output and automatic Reset. By adding external relays you can immobilize the vehicle and flash the lights....
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Hartley oscillator are inductively coupled, variable frequency oscillators where the oscillator may be series or shunt fed. Hartley oscillators have the advantage of having one centre tapped inductor and one tuning capacitor. This arrangement simplifies the....
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This circuit delivers either 4. 8 or 7. 2 V regulated at 15 mA with a 3-V input from a bank of photocells. Rl should be 453 kQ for a 7. 2-V output and 274 for a 4. 8-Vdc output. Regulator efficiency is around 70%. This should be considered when selecting....
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The goal of the project is to develop a system, which uses Mobile technology that keeps control of the various units of the home appliances, which executes with respect to the signal sent by the mobile. For utilization of appliances the new concept has been....
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This Circuit needs a adapted 10V-DC advanced end able of bartering 2 Amps. Starts the allegation aeon at 240mA and at abounding allegation switches automatically to a float action (trickle charge) of 12mA. The capacitors are the bowl 50V (or better) type.....
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The modem off indicator is intended especially for serious Internet surfers. It will be seen that the circuit of the indicator cannot be much simpler, or....
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A DC to DC converter is needed for a board that only has +5V supply but have to provide dual-polarity supplies for few device such as op-amp or some DAC. Using....
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Every innovations starts from a simple day to day life problem like you watching IPL in TV and suddenly the current shuts off, fortunately you will find another way to watch the match via mobile network. Similarly, I too had faced a problem of frequent....
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UPS Schematic Circuit Diagram for 3000 Watts UPS It can also work for 1000 VA with minor modifications...
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Attached the circuit schematics 12 Volts : from car battery Ground : Car chassis Signal : from the sensor stepper motor The No 5 Pin of LM3914 c....
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1995 Nissan Altima Brake And Tail Light Wiring Diagram...
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wireless FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an..
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This is the standard configuration on how to Interface a uC like 8051 to PC RS232 with MAX232A. The UART or Serial port was not present in 8049/8749 chips which were the ancestors of 8051/8031. Pages of code were needed to make a software UART in MCS-48. The....
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This article describes the proposed solution for a 200 W Power Supply using the FSFR2100 Fairchild Power Switch (FPS). The input voltage range is 90 265 VRMS and there are six outputs with...
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Ever Imagined controlling your home appliances using your cell phone. You can find a lot of circuits for this application. But they make use of Telephone. I modified the circuit and redesigned it to make it compatible with normal cell phone headphone. Just....
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A Light Dependent Resistor (aka LDR, photoconductor, photoresistor, or photocell) is a component used commonly in electronics which has a resistance which decreases as the intensity of the light hitting its surface increases and visa versa. A typical light....
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This is very stable, harmonic free, long range fm transmitter circuit which can be used for fm frequencies between 88 and 108 MHz. This can cover 5km range....
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A number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it....
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This is a simple NiCd battery charger powered by solar cells. A solar cell panel or an array of solar cells can charge a battery at more than 80 % efficiency provided the available voltage exceeds the fully charged` battery voltage by the drop across one....
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The sustain pedal is also known as the Damper Pedal. When operated it sends out a controller value of CC64. When the pedal is pressed ON the unit outputs a value of 127, when released OFF the unit outputs a value of 0. Tone-generators without the....
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This is a discussion on Headlamp dimmer controlled foglamps within the Ford Raptor Lighting Modifications Forum forums, part of the Ford Raptor Forums - Modifications category! For those of you wanting to install fog lamps and would like to have them....
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TMS320C6678 DSP is a section of DSP based on KeyStone framework that TI released newly, have 8 kernel, the intersection of operating speed and until the the intersection of product and of various fields performance index increase reachable 10 GHz. while....
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With two light barriers closely positioned one after the other it is possible to establish in which direction they have been crossed. If, for example, you place it at the entrance of the toilet then you can use it to control the lights: on when entering and....
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The LTC3722-1/LTC3722-2 phase-shift PWM controllers provide all of the control and protection functions necessary to implement a high efficiency, zero voltage switched (ZVS), full bridge power converter. Adaptive ZVS circuitry delays the turn-on signals for....
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The purpose of this circuit is that of power a lamp or other apparatus for a given time (30 minutes in this case), and then to turn it off. It`s useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep.....
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An inductance meter could be a valuable test instrument for a hobbyist to own. However few people own them because of the high price tags found on such instruments. That`s about to change. The Inductance Meter Adapter described in this articleis a circuit....
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The inputs of the gate must be connected, either to LOW or to HIGH, and must not be left open circuit. This is the function of the input switches with their pull-down resistors. To avoid loading the output of the gate, a transistor switch indicator circuit....
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A Mobile Controlled Robot is a mobile device, which provides wide-range of wireless control ability to your robot unless your cell phone gets out of signal....
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The following is one of the most rare and special documents here at the DigiBarn, the only known copy of the complete schematic specification of the 512K Macintosh Logic Board. Daniel Kottke co-authored this design which served as the basis for the 64K....
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This 3 volts Car Adapter circuit is based on a standard LT1074CT switching regulator IC. The schematic shows the LT1074CT used as a positive step-down or ‘....
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This circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio....
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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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70/40 Watts Hi-Fi amplifier is most advanced, and best Hi-Fi amplifier having almost 0% distortion circuit diagram and description of hi-fi amplifier.hi-fi amplifier...
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Here`s a circuit diagram of automatic muting for audio systems using IC LB1403. The signal from pre-amplifier such as LA3160, LA3161 or HA1032 is connected to the base of the amplifier transistor BC548 (T1). Variable resistor VR1 is used to control the gain....
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Have you ever wanted to run a TV, stereo or other appliance while on the road or camping? Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC....
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Bass booster of this website is used to boosts the beat frequency without effect the high frequency circuit diagram of bass booster bass booster and different radio circuit...
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If the sensor system need an active supply, we can use only a single pair of cable to carry both the power supply and the output signal. Not only simplify the...
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The standard Class AB audio power amplifier allows for direct coupling of the output of the amplifier to speakers. This is very good in that no capacitors or transformers get in the way of the sound quality coming out. The speakers are connected directly....
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This is circuit Variable Regulator power supply, Output voltage 0-30V and Current 5A max. Use IC LM723 is a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA I so use Transistor....
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A basic digital voltmeter circuit using the Harris Semiconductor ICL7107 is shown. It has a 2-V range. Calibration consists of applying a known voltage of 1.2 V to the input and adjusting R3 for a correct reading on the display. Supply is ±5 V, and S1....
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This circuit canbeused for detecting infrared light, for example, it is used for detecting infrared band light signal in spectrophotometer. Amplifier output voltage Vo=Is·Rd·Rf/Ri wherein : Is-signal current; Rd-optical detector essential resistance Dector....
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When you want the counter circuit since 0 arrive at 99. I thinks this circuit may on the same wave length you certainly. it uses IC LM4017 decade....
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This is a low cost 150 watt amplifier circuit with diagram and schematic design using two darlington power transistors tip 142 and tip 147. this amplifier circuit can This is a low cost 150 Watt amplifier circuit with diagram and schematic design using two....
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Automatic Headlight Brightness Switch Circuit Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your hea....
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A full foot long arc and get to more then 1million volts eventually. I have finally built a REAL Tesla coil that operates via an arc and capacitor combination. Not just a flyback or transformer setup in series. It was not as difficult as I thought it might....
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This is the original Circuit Cellar ImageWise Transmitter that I started with. I disassembled the code and made it grab two half size images. This allowed me to get an image from the odd field and even field. I then wrote code to subtract the two fields....
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An interesting circuit of a bicycle horn based on a popular, low cost telecom ringer chip is described here. This circuit can be powered using the bicycle dynamo supply and does not require batteries, which need to be replaced frequently. The section....
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Ensure that the 12V(yellow) wire is connected to the right of the D-connector(as seen from behind, i. e the connector holes away from you with the curved portion of the connector upwards) Disclaimer: All the information present on this site are for personal....
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With the storm season recently upon us, it`s not uncommon to switch car headlights on during the daytime. Unfortunately, it`s easy to forget to turn them off again when parking, with the result being a flat battery. This circuit will sound an alarm if the....
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A Polaris Jet Ski Model SLTX 1050 3 cylinder, 1998 year. Unit was running when it blew piston. I removed engine and rebuilt and put back together only now it will not start - can not get it to spark. ` I followed the manual` on disassembly and re-assembly, I....
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A MAX620 connected to form a complete stepper-motor drive. TTL/CMOS signals from the logic network are translated to high-side levels that drive four N-channel power MOSFETs, supplying current to each of four stepper-motor phases. The diodes provide a....
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Automatic headlight dimmer circuit diagram for your car`s headlight, keep you safe with maximum bright for farthest visibility, but will automatically switch....
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The PIC/Generation 1 electronics do not have any form of current limitting. They rely on the stepper motors resistance to keep the current below 2 Amps at 12 Volts. Unfortunatly the more commonly available Steppers of the size used in RepRap have much lower....
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This project describes a light effect that is similar to the one of the car in the TV series `Knight Rider`....
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Direct Digital Synthesis (DDS) frequency generation has been around for quite a while, but most of the homebrew DDS projects are rather complex and use expensive chipsets. Murray ’s exciter has only 3 inexpensive IC ’s,and the whole thing can be built for....
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Each step will result in a self functional unit. In the end of this journey, you will be able to link the steps together into a very powerful FM transmitter. This part will explain the main controlling unit for the FM transmitter. This part is very important....
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This is a HiFi pre-amplifiercircuit diagramwith low noise output. Very wide range frequency from about 10Hz until up to 100Khz will be gained by this preamplifier for maximumaudioperformance...
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The schematics on this page are provided strictly for educational purposes. If anyone intends to use these designs for profit, they are required by law to obtain permission from the legal owner(s) of the design and comply with any and all laws pertaining to....
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A relay is essentially an electrically operated switch it has a coil that uses magnetism to close the contacts on the switch. In automotive terms 12V running through the coil will allow 12V to run through the switch contacts. So why is a relay useful You can....
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The strategy is to get the circuit going in stages, testing each part as you go. Once everything is wired correctly and can be either controlled or read by the computer correctly, then you can write the main program with confidence that all the pieces are....
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This site is primarily for me to collect together things that I find useful that I don`t want to forget but occasionally I may put together some pages that others may find interesting. Please have a browse and see what you can find. I tried to make the....
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The circuit consists of power circuit, infrared controlling circuit, temperature examining circuit and temperature unusual warning circuit (It is showed in picture 9-42.). When the temperature is lower than the reset temperature the semiconductor....
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The quadrature-grid signal is excited by a reference from the transmitter. This may be a sample of the unmodulated master oscillator providing a phase reference for the detector...
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The circuit is able to charge 2. 4V, 4. 8V, and 9. 6V NiCd batteries. The LM317T IC showed in this NiCd battery charger schematic is use to regulate the voltage to battery charge the NiCd batteries as you know that the LM317T IC is a very popular IC from....
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USB car charger adapter circuit design using LM317 regulator circuit..
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If you have a servo and you wan`t to test it and you do not have a remote control to do that, or want a tester to test it you can try making the following schematic of servo tester. You can se is based on a 555 timer. The circuit is very simple and cheap to....
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This is a simple single-zone burglar alarm. The basic design includes automatic Exit and Entry delays. It doesn`t include a siren cut-off timer. But with A Small Modification - you can add one to the circuit. The alarm will accept the usual types of....
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The AD7781 is a complete low power front-end solution for bridge sensor products, including weigh scales, strain gages, and pressure sensors. It contains a precision low power 20-bit sigma-delta (?-?) ADC, an on-chip, low noise programmable gain amplifier....
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Replacing the front-end with a circuit that down-converts VHF signals in the 2m, 4m or 6m bands to HF signals that can be received in the RX`s "back-end" (which is essentially the Ensemble II RX). The parts provided in this kit permit the builder to select....