Popular Circuits Page 116
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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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It is a simple circuit regulated power supply, based on the known LM 723, that drive a transistor Q1 [2N3055]. The regulation of voltage, of expense becomes with potentiometer R1 from 0v-30v DC roughly. In order to we achieve 30 V, will should the....
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Dedicated model rail enthusiasts using sophisticated train and points controllers often have the problem that as their layouts get bigger and more complex, the transformer supplying power to the points does not have enough current to switch several points at....
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Here we describe a simple process to `put a voice on a sunbeam` and transmit it over a distance. It is a fascinating example of amplitude modulation of light using sound vibrations. We then describe how the modulated light is detected and demodulated in a....
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Two multivibrators with different frequencies can be built using the NAND gates of a 4011 IC. If the output of IC1. B is positive with respect to IC1. C, LED D1 is on. As the levels of IC1. A and IC1. D are exactly opposite, D2 is always on when D1 is off,....
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The circuit of Figure 1 shows how you can configure a FIFO memory, a static SRAM, and a bus register to generate fast hardware histograms for linearity tests and still allow straight data acquisition for other tests. The main purpose of the FIFO memory is to....
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This launch controller can be used with low voltage battery igniters, which fire rocket engines in model rockets such as the Estes range. These circuits are electrical, only switches and contacts are involved. First the circuit for a single rocket...
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A very simple low cost water level indicator circuit can be designed using this schematic circuit. This water level indicator is based on a simple CMOS IC CD4066 and indicates the amount of water present in the overhead tank and also gives an alarm when the....
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An old RC car but without the transmitter so I built my own Rx/Tx using MCU and 2. 4Ghz transceiver, however, I want to use the car`s original H-Bridge but not sure if I understood how that circuit works...
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AN6884 is a logarithmic scale LED bar display driver. AN6884 accept wide range of supply voltage, ranging from 3.5V to 16V. This VU (voltage unit) bar display...
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More examples to connect your transceivers to the computer for SIMPLEX software operations are described in the pc_tx. bmp file that is included in the simplex. zip file...
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We hold the "first rights" to the presentation of this approach and the best part is: "It's FREE!"
The PIC12C508A is one of the most amazing devices but because it does not come in a low-cost re-programmable form, it has never been presented in a....
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A detailed DIY remote controlled AC Fan regulator with 10 stage speed control. Made with ATmega8, full source code and PCB Layout....
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The schematic here is of the original Music Man Stingray bass guitar preamp. It runs off 9VDC and I have left off the voltage divider part of the....
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A remote control car that can be driven over the internet or with a laptop wirelessly from up to 500m away. It has a live-feed network camera so that it can be driven without line of sight and a horn so that you can honk at people. A while ago I discovered....
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The mine railway connects the national railways and intermediate links of the mining area, it is the important constituent element of the transport network of the railway. Relevant materials statistics show, the Chinese mine railway exceeds 20, 000....
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The circuit shown here is a simple stereo FM transmitter that can transmit signals of high quality with a range of 70 feet. The circuit is based on BH1417 PLL Stereo Transmitter IC semiconductor Rhom. The IC has separate sections of audio processing for the....
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This HD TV UHF wideband amplifier (Ultra High Frequency amplifier ) has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the....
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This is a motor controller circuit that? control the speed? and direction of series-wound Motors. This circuit employs silicon controlled rectifiers (SCR)...
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This circuit enables transistorized items such as radio, cassettes, and other electrical devices to be operated from a car"s electrical supply. The table gives values for resistors and specified diode types fordifferent voltage. Should more than one voltage....
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By adding a small amount of noise to a signal to be digitized (about 0.7 bit): where: n = #..
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As shown, the zero volt switching circuit in the zero crossing of the AC voltage generated trigger pulse. In order to trigger the zero crossing of the 555 limit comparator conn..
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555 Timer Sound Effects Videos 1. This is Make website light theremin with 555 timer. Good spooky Halloween 3. film countdown 4. uHD chessboard timer karo black & 5. I made this tiny noise machine based on Forrest Mims` Engineer`s....
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This portable solar lantern circuit uses 6 volt/5 watt solar panels are now widely available. With the help of such a photo-voltaic panel we can construct....
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The gap between TTL graves and the PC can be perfectly filled with modern microcontrollers. They not only contain the CPU but also program and data memory, EEPROM, I/O ports, timers, some even ADC and UART. With that you have a complete little computer....
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The circuit of Suzuki GSX1300 Hayabusa Charging System composed of generator, regulator/rectifier unit and battery. The AC current generated from the generator is rectified by the rectifier and is turned into DC current, then it charges the battery. While....
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Here is verified circuit of simple, interesting and inexpensive electronics clapper (sound generator) circuit diagram with description of electronics clapper...
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This application note provides valuable PC board layout, bypassing and decoupling guidelines for customers who are implementing high-speed data converters in their designs....
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Circuit designed for 5-mA meter movement uses two-stage voltage ampilfer Q1-Q2 with emitter-follower output Q3 serving as impedance-matching stage AF input for S-9 reading is 25-30mV P-P and forfull scale is 50-60mV P-P Frequency response is 500 Hz to 10....
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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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This article discusses application circuits for Maxim force/sense digital-to-analog converters (DACs). Applications include: selectable fixed-gain DAC, programmable gain DAC, photodiode bias control, amperometric sensor control, digitally programmable....
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This circuit features the ZTX450/ZTX550 transistors in a push-pull output stage. The following readings were taken at maximum volume: Input: 0.4 mV rms, Output: 1.8 V rms, Voltage gain: 4500, Max. output before distortion: 2.25 V rms -supply current ~ 3.5....
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Usually, semiconductor laser diodes are operated from current drives. Unfortunately, The output power is strongly dependent on the device temperature ? a...
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There`s pretty easy to make squarewave inverters` circuits in the internet. But to run most load like fan, TV, etc you need to have a sinewave inverter. Making sinewave or near-sinewave inverter is more complex and costly. But we can also convert squarewave....
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The circuit described below monitors your car`s brake lights, and indicates by a light emiting diode 12V whether they both function correctly. In that sense, it can save you money by preventing your being fined for driving with defective brake lights, and it....
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DHT11 is the most inexpensive sensor currently available in the market that provides calibrated digital outputs for temperature and relative humidity. It is availab....
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When computer peripheral equipment is interfaced, it is convenient to work with logic signal levels. With a nominal 4 V at the output dropping to - 0.6 V on illumination, this circuit reflects the requirements of a high-speed, paper tape optical reader....
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By using the preamplifier with a short length of shielded cable and clip leads, signals that generally could not generate a readout, generate precise and stable readouts on the counter. The DPDT switch is used to bypass the circuit when amplification is....
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Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
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Most analogue multimeters are capable of measuring resistance over quite a wide range of values, but are rather inconvenient in use due to the reverse reading scale which is also non-linear..
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Network with Cadence technologists and peers in the Cadence Community. Stay abreast of technology trends, news and opinion through Blogs, forums, and social networking....
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This siren alarm circuit diagram is based on a specialized IC UM3561, which is a low power CMOS LSI specially designed for this type of applications. The UM3561 contains all needed parts ( oscillator, selector circuits, programmed mask ROM ) to simulate....
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This power supply uses an LM317J adjustable regulator and an MJ2955 pass transistor. Ql and U2 as..
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This is a simple circuit but have a high performance power amplifiers. This power amplifier is available as a PCB, with full list of parts to ....
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300 ~ 1500kW direct distribution of Lightning generator for single capacity 300-1500kW straight with the generator of Lightning FIG. 300 to 1500kW straight with a generator of ..
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Cigar Lighter Plug to USB Power Socket. This circuit is convert 12V DC source from car cigar lighter plug to become USB power sochet with 5V DC output. This circuit can be used to powering 5V electronic devices or recharge the rechargable battery from USB....
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Using an oscillator running at 455 kHz, the metal-detector circuit produces an indication on the meter Ml. When the oscillat..
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This be circuit warn when be become dark, or Light sensitive switch. By use electronics part the base is important , be the transistor 2N2926 and AC128. For...
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P89LPC901, Vacuum Cleaner, Soft start, Harmonic suppression, Low cost A low cost P89LPC901 based vacuum cleaner system is introduced in this application note. Design hardware and software are fully discussed. This system CAN also guide the design of other....
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Here is another little circuit I designed for radiation logging purposes. It is based on an Atmel 168 Microcontroller and a small and precise RTC device called RV3029. I also used an AT45DB41 Dataflash for this Circuit, as I had the sourcecode for....
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The aim of this project was to get a digital camera into a small electric radio controlled (RC) aeroplane and still have it fly. The aeroplane shown, a park flyer, weighs between 400 and 550 grams depending on the size of battery and wing configeration that....
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This simple circuit tells you about the status of phone such as Line OK, Dialing and Call attended. It also has a lock facility to block outgoing calls keeping the incoming calls as usual. This prevents misuse of telephone. The circuit uses only a few....
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The amplifier can be assembled by a reasonably experienced hobbyist in about three hours. The metalwork will take somewhat longer, and this is especially true for the high continuous power variant. Even so, it is simple to build, compact, relatively....
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This circuit determines the cold cranking amps of a battery by first discharging the surface charge, then checking the internal resistance. This gives a more realistic measurement than simply measuring the instantaneous drop in voltage with a load. A....
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Cell phones and PDAs are approaching the limit for small form factors, but their feature sets are growing with new functions such as built-in cameras and even video cameras. The initial in-phone cameras were basic, low resolution devices with little in the....
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This circuit stores a single morse code message as bits in an EPROM chip, the message is sent to a relay which can key a CW transmitter. The keyer can output either a one-shot message such as "CQ DX DE CALLSIGN", or a continuous message. The continuous mode....
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The basic problem for me is that gates on a logic circuit appear to be creating power from nothing, which is impossible. For example imagine two NOT gates connected in sequence: To my uninitiated mind what seems to be happening is that the first NOT gate....
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This board layout was created using the SOIC version of a PIC16F627A without drawing the usual schematic first. Most of the part values are etched on the Layout. The SIP resistor packs I used are 10k ohm, some experimentation with this value may be....
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This Car audio amplifier gives ouput of 40w from 2 ohm speaker. his car amplifier circuit gives an output power 40 watts per channel at 2 ohm load, and 22 Watts on 4 ohms load. Perhaps you are wondering how to get 40 watts of power And answer is : you can....
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Color sensor. Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green and red (primary colours); magenta, yellow...
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THE PRINCIPLE of operation of the RCA Theremin is that of the beat frequency oscillator, The frequency of one oscillator may be varied by the capacity change caused in an associated circuit by the movement of the hand to or from a pitch control rod, Also an....
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Information for the radio broadcast and listening amateur in VERON department Nieuwegein (A29) and surroundings...
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Using a similar circuit to the LF block converter, I`ve made a Schumann Resonance Converter that moves the near-DC signals up to around 2 kHz for an ordinary soundcard. Here`s the maiden run plot: It seems to work! The fuzzy lines below 30 Hz are due to the....
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Beeps 7.5 seconds after a preset time
Adjustable time settings: 15 s. 30 s. 1 min. 2 min. & others This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a....
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A very cheap and simple repellents can be used for rats, mice and other animals may use electronic figure below. Circuit using CMOS integrated circuit type 4047 is connected to..
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The Part of 1996 Ford Windstar Wiring Diagram: power distribution, common, rear, ignition, fuse panel, battery, instrument illumination, radio, left rear speaker, remote headphone module, solid state, right rear..
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This is a design circuit for digital voltmeter with LED display. It`s ideal to use for measuring the output voltage of your DC power supply. It includes a 3. 5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199. 9V....
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Designing A Li Ion Battery Charger with Load Sharing MCP73837 Batteries often serve as the main energy source for portable electronic devices. Although they depend on batteries, portable consumer electronic products, such as GPS devices and multi-media....
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In Broadband networking and high speed computing applications, multiple high current, low voltage power supplies are needed to power FPGAs Flash memory, DSPs and Microprocessors One such example calls for a maximum of 60A of current to power the CPU at 1. 5V....
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This is a 1 watt fm amplifier with a good design that can be used to amplify a rf signal in the 88 108 MHz band. It is very sensitive if you use good rf power amplifier transistors, trimmers and coils. It has a power amplification factor of 9 to 12 dB (9 to....
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What is SMPS? Switched Mode Power Supplies (SMPS) belongs to the category of D.C. to D.C. converters and D.C. to A.C. Converters ..
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H-Bridge
This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first. Using bigger parts could make it more powerful. Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it....
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The Part of 1986 Honda Civic Wiring Diagram: neutral, automatic choke hater, charge warning light, resister, starter motor, sterter solenoid, thermo sw, reguletor, alternator, destributor, igniter, ignition coil, spark plugs, air temperature sensor,..
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A battery is a vital element of any battery-backed system. In many cases the battery is more expensive than the system it is backing up. Hence we need to adopt all practical measures to conserve battery life. As per manufacturer`s data sheets, a 12V....
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My FM Wireless Microphone has been a very popular project with beginners and experienced constructors alike. It has been used inside guitars and as the basis of a remote control system. I do however, receive many requests for a higher powered circuit and....
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The design of the current application of the wider selection of VHDL hardware description language to realize the intersection traffic light system controller hardware circuit description, in the Altera`s MAX PLUS EDA software platform environment through....
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This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is....
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This temperature switch uses a few discrete components to trigger a buzzer when the temperature of the surrounding increases. Suitable for use as a simple fire alarm indicator ..
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Automatic water level controller circuit is a simple engineering project. It can automatically switch ON and OFF the domestic water pump set depending on the tank water level. You can implement this motor driver circuit at your home or college using less....
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This circuit features a timed output and automatic reset. It can be operated manually using a key-switch or a hidden switch. By adding an external relay, it will set itself automatically - and/or immobilize the machine - every time you turn-off the ignition.....
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Many analog ohm meters have non linear scale, so the resolution become worse at higher resistance value. This because they use cheap current source, only a...
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Figure 1 shows the schematic for a universal input, 7. 6 V, 700 mA CV/CC power supply for LED Driver applications, using the LinkSwitch-II product LNK606PG in a‚ flyback con guration. The LNK606PG (U1) combines a power switching device, Oscillator CV/CC....
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Later in the sixties, the first distortion effect boxes were made to simulate the sound of razored cones and overdriven amps. Now, most amps have a distortion control, but distortion effects are still popular. Now we`re going to discuss the methods of....
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Hello i have a 2002 gmc sierra 4wd 1500 series 4.3l. i just replaced the transmission on it along with the neutral safety switch. The problem i am....
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Those who`ve scrutinised my PC-board layout very closely, will see that I`ve changed the design slightly from the circuit which I posted a while back. ....
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The Maya used several calendars simultaneously. One of them called the "long count", is a continuous record of days from a zero date that correlates to Aug. 13, 3114 BC, and is more According to maya`s celender when the both the wheel of the maya celender....
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It uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and emitter and....
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A Simple yet Versatile Dimming-Ballast Solution for Low-Energy Lighting EU-wide legislation promoting use of Compact Fluorescent lamps (CFLs) in place of incandescent bulbs could save as much....
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This circuit functions as a wideband adjustable AGC amplifier. With an effective bandwidth of approximately 10 MHz, it is capable of handling rf input signal frequencies from 3.2 to 10 MHz at levels ranging from 40 mV up to 3 V pk-pk. AGC action is....
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This circuit has been designed to alert the vehicle driver that he/she has reached the maximum fixed speed limit (i.e. in a motorway). It eliminates the necessity of looking at the tachometer and to be distracted from driving. There is a strict relation....