Popular Circuits Page 213
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The following circuit shows about Liquid Level Sensor Indicator Circuit Using LM1830 IC. Features:Manufactured by National Semiconductors, the ....
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32.FM radio circuit ; FM radio tuning circuit circuit (2) FET circuit in FM radio application tuning circuit is shown in Figure FM radio circuit, which is composed of a high fr..
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I am pulling my hair out since I keep destroying the Murata NMC1215SC DC/DC converters in my CPU controlled H-Bridge design. There is no obvious signs ....
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This transimpedance amplifier employs a current-reuse stage and cascade differential stage to achieve a continuous gain tuning range of 15 dB and low noise figure of 1.061 dB at 2.4 GHz....
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Here is one basic circuit of a simple but accurate 1Hz timebase generator built around a standard Quartz clock circuit board. Just lift the clock PCB from any cheap quartz clock and carefully remove all extra components like the drive coil, buzzer, alarm....
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In operation, the alarm circuit allows a 0-47 second time delay, as determined by the R1/C1 combination, after the switch is armed to allow the vehicle`s motion sensor to settle down. This allows you time to get a bag of groceries out of the trunk and not....
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A very basic introduction to RS232 based serial communication on ATmega32/16 using the USART hardware. But before you start reading, let me warn you this post is a bit lengthy (but contains everything you need as a beginner. so no skipping :P), so bear with....
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I have been able to monitor the power usage of the home with the Power Node. One project I have been meaning to tackle is to monitor the water usage as well. The photo below shows my main water meter. I also have a "sub-meter", which measures the water usage....
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Sometimes electrolytic capacitors that are stored for some time will exhibit high leakage currents..
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The V2. 2 PCB has 4 spare connectors (X11 to X14) these can be used for various inputs and outputs for the following circuits as they are conveniently available on the 37pin DB connector: The V3. 0 PCB has 4 spare connectors (SPR1 to 4) these can be used for....
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DBS-20-type leakage protection circuit ..
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The triac should flip on and the light and it should be at nearly 100% brighness. However, this is not what`s happening. Itstead, the light doesn`t turn on at all. Can anyone explain why this might be If I change the gate to be always triggered (i. e. always....
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For our strong construction with the two 807 we do not need words. We all know the performance of such a machine. In this construction we have the peculiarity of high upward tension and independent coupling. On the output lamps, resulting in the output power....
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NiMH CHARGER Circuit diagram using ADM66A Searches related to CHARGER Circuit, nimh charger circuit, lead acid battery charger circuit, lipo charger circuit, automatic battery charger circuit, simple battery charger circuit, lithium battery charger circuit,....
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The well-known LM386 is an excellent choice for many designs requiring a small audio power amplifier (1-watt) in a single chip. However, the LM386 require....
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The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. I designed this circuit to use 12V computer fans, as these are now very easy to get cheaply. These fans typically draw about 200mA when running, so....
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The Traffic Light Hack is a simple interface for controlling lights inside a traffic light enclosure. No, not a real light out on the street. This one was picked up at a flea market, and it`s hanging in my room. It is designed to be an ambient information....
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The following circuit shows about Flashing LED EGG Timer Circuit Diagram. This circuit using the 2N2646 transistors. Features: MPF112 FET ....
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These novel relay driver circuits have the ability to pick up a relay with a coil voltage rating equal to double Vcc. After pickup, the relay armature is h....
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The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether it be man made interference or static. In this design the RF signal is first met by a resistive....
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For many years, the Q meter has been an essential piece of equipment for laboratories engaged in the testing of radio frequency circuits. In modem laboratories, the Q meter has been largely replaced by more exotic (and more expensive) impedance measuring....
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This is a MOSFET transistor based power amplifier circuit that can be operated between +35V to -35V range. The input voltage is pre filtered and pre amplified before applying to the MOSFET switch. The pre audio amplifier is a differential amplifier section....
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The three port valve is a masterpiece of clever engineering, in that it manages to move to one of three positions using only a cheap non-reversible AC motor, a spring, a couple of micro-switches, a resistor and a diode, and act as a relay for the boiler into....
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Electronics Nerd shows us how to reverse engineer an IR remote control signal. By understanding what type of signal is being transmitted out of the remote control allows a microcontroller to simulate the code to control the Hampton Bay Air Conditioner. "In....
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This must generate an awfull lot of RFI without a choke! The house wiring supplies the di/dt limiting. This is a CHEAP design which exhibits hysterisys at dim settings. Not everything made and sold to the public is top notch...
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The Tiny Audio Amplifier kit is a good choice for battery operation. It is based on LM386 IC. Power supply - 6 - 12 VDC. Output power - 1 W, 8 Ohm. The quiescent power drain is only 24 mW when operating from 6 VDC. Self-centering output quiescent voltage.....
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The character data and command from the microcontroller is transferred serially to a shift register (74HC595), and the parallel output from the shift register is fed to LCD pins. 74HC595 is a high-speed 8-bit serial in, serial or parallel-out shift register....
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Symmetry of the square-wave output is maintained by connecting the right side of R2 through resistor R3 to the output of the third amplifier stage. This changes the charging current to the capacitors in proportion to the setting of frequency-adjusting....
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Back radiation small buffer amplifier It shows an inverse radiation small buffer amplifier. The circuit consists of three series-connected transistors of the buffer amplifier c..
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These frequencies include TV in VHF and UHF and also the radio broadcasting frequencies in the 88 - 108 MHz FM band.. Component: Resistor, IC, ....
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A 1994 Pontiac Transport. the front wipers only work on high. Someone said I need a wiper motor and someone else says I need a wiper pulse module. Where is the wiper pulse module located the pulse module, or sometimes referred to as the control module, is....
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The servo motor have many utilizes in everything from robotics to puppetry to photography and beyond. These tiny motors can position their output shaft to any position on command and hold that position. Most servos possess a range of motion to about 210....
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The ultrasonic atomizer circuit is composed of the power supply circuit, oscillator circuit and the water level control circuit, and the cirucuit is shown in Figure 3-189. Power supply circuit is composed of the power transformer T, rectifier diodes VDl-VD4,....
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This is an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital....
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As of control type delay circuit discharge Discharge delay circuit and a delay circuit rechargeable compared Discharge delay circuit can obtain a longer delay, and the delay is..
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. This is simple class A MOSFET amplifier 2SK1058 used in the circuit. It is easy to do, you should use a 24V supply volt at....
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I describe a simple direct conversion receiver, thinked for QRSS and DFCW communications, as companion of ARGO or SPECTRAN programs. I don`t pretend to beat the performances of professional or commercial ham radio receiver, the scope is to suggest an easy....
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this instructable will show you exactly how to read all those confusing circuit diagrams and then how to assemble the circuits on a breadboard!for all....
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Analyzing the three-phase i [l + Jl search winding its head and tail of many therapies such as the use + hair bundle judge committed two apostrophes. Simple and easy to i safel..
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To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be calibrated for real time clock. The PAUSE SW must have a Switch....
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This one of its kind and hard to find triac control AC voltage stabilizer circuit has been designed specifically just for you. Being solid state in design, the voltage switching transitions are very smooth with minimum wear and tear, resulting in efficient....
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This circuit is easy to recognise by the three equal-value capacitors and two equal-value resistors connected to the base of the transistor. We have already mentioned the signal at the output of a transistor connected in COMMON EMITTER mode is FALLING when....
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You can choose the Transformer on the grounds of maximum voltage and current output needed. Best choices are: 36, 40 or 48V center-tapped and 50, 75, 80 or 100VA. Q4 must be mounted on a good heatsink in order to withstand sustained output short-circuit. In....
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The Advanced Laser Diagnostics Laboratory (ALDL) specializes in the development and application of laser diagnostics for fluid dynamic measurements. Areas of specialization include high-repetition rate flow visualization (up to 1 million frames/sec) and....
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This article tries to get you some idea how to interface IR remote controllers to computer. Possible applications could be controlling your computer your TV`s remote control or controlling your VCR using computer. This circuit was posted to sci. electronics....
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This is two three pole bandpass filters with the HPF Fo about 50Hz and the LPF Fo about 15kHz. This limits the input bandwidth to the phase sequence array, which can produce 90° phase shifts only over a limited bandwidth. The array is driven with a true and....
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A relay sequencer is used in a radio transverter and is use to activate particular stages in order after short delay. This project describes how to build this sequencer. It has the following features. This stage is used to switch the output / input of the....
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Electric water heater temperature control circuit, with water level indication, temperature and anti-dry, leakage power automatic protection function, safe and reliable. (1) Th..
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There is a lot you need to know to completely design an inverter. Unless you can acquire a custom made transformer your circuit design is ruled by th....
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Audio light modulations add to the enjoyment of music during functions organised at home or outdoors. Presented here is one such simple circuit in which light is modulated using a small fraction of the audio output from the speaker terminals of the audio....
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Interfacing the BT139-600 TRIAC with this MOC3051-M Opto-triac. Build a snubber circuit for the TRIAC as shown in the MOC3051M opto-triac`s datasheet @ page 8, figure 12. The load will be a 230V AC, 4A motor. What are the recommended characteristics of the....
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The XLR or Cannon-type connector is clearly a better audio connector than a 6. 5mm jack plug and socket, but tradition makes the 6. 5mm socket mandatory despite its serious connection problems. Inputs range from a single socket connected directly to the grid....
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Using an Atmel ATTiny2313 microcontroller and an HD44780-compatible character LCD display, along with a reed switch and some magnets, I was able to construct a tiny speedometer/trip computer for a soapbox derby cart. It measured the speed of the cart using a....
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As shown it is one for the 10GHz frequency amateur radio waveguide detector. ..
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R2 controls how fast C1 charges, and I know that at a certain point C1 will trigger Q1 and Q2 to release the 9 volts (see 2). This 9 volt burst creates the clicking sound. How does the capacitor discharge I imagine that the capacitor will slowly charge up to....
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The figure shows an easy project / schematic of a metronome. A metronome is a device that is used by musicians. The circuit produces continues beats in the speaker....
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Controlling a small dc motor without speed control sounds like a trivial task; a switch or a relay should suffice. However, several problems accompany this approach. For one, the switch, because of the inductive load and the low starting resistance of the....
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Building your own signal generator is a rite of passage for any analog DIYer, but it`s one I took a long time to get around to. I already have a bench signal generator, but I decided it would be useful to have a small battery powered device that I could....
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It is 8-Bit, Microprocessor-Compatible, A/D Converters. Data Collection Analog to Digital Conversion and Communicating and It uses an ADC0804 chip to convert from analog to digital, an AT89C2051. The ADC0802 families are CMOS 8-Bit, successive-approximation....
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Here is an idea for a simple low-cost adaptor that allows a portable FM radio (or MP3 player with FM tuner) to be connected to an external antenna and to audio equipment such as a hifi system or PC sound card. Portable FM radios and some MP3 players....
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Diagram shows a timed light control switch circuit in Mexico, especially for outdoor advertising light boxes street lamps and power control, it is time saving switch circuit. Now with the door switch to manual control of lights and more, often forget to turn....
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A circuit of low-power switching regulator is shown in the schematic diagram below. This circuit can give output voltage of 5V from 9-V source. The efficiency....
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This circuit provides a unique solution to a common system-level power distribution problem: When the su..
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AC adapter circuit It shows portable digital products AC adapter circuit, the low voltage DC into AC 220V voltage. The circuit configuration of switch power drill with oscillat..
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The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386....
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A PIC16x84 processor may be used to generate a PSK31 or FSK31 signal. This could be used for beacon transmissions (as described here) or they may be used for telemetry, experimental, or even QSOs - the latter being true if you are willing to put up with a....
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The oxygen sensor simulator as built on a protoboard. Note the cigarette lighter plug used for power source. The adjustment knob is at the left, and the switch is on the right. The red indicator LED is in the middle. Only use red, because the voltage drop of....
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This Circuit using only a single cell 1.5V battery.C1 need to be adjusted for peak reading. Then, to use it, turn on the transmitter and meter. ....
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This circuit converts surrounding radio frequency waves to electric power. It can provide 40 Volts at 10 Watts indefinitely. The output power can be improved playing with the antenna. Placing the antenna near large metal objects gives more power. Antenna....
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An inexpensive electronic instrument useful in demonstrating electrostatic phenomena. First, Ahern`s instrument can be employed as an inexpensive and effective substitute for the tonal electrostatic voltmeter. Second, the instrument provides....
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A vacuum fluorescent display (VFD) tube is a type of tube which consists of a hot cathode (filaments), anodes (phosphor) under a high vacuum condition in a glass envelope. This clock uses tube types 8843 or 8894 made by Sylvania in the early seventies. The....
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The circuit is use to regulation dual power supply that provides +12V and -12V from the AC mains. A power supply like this is a very essential tool on the work bench of an electronic hobbyist. This is the figure of the schematic of the circuit. This circuit....
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The Slave Flash Trigger is switched on/off by pressing the push button. When switched on, one to three flickers of the indicator lamp signalizes the programmed mode. One flicker determines that the flash will be fired at each flash. Two flickers indicate....
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This is essentially the simplest circuit with additional indicator LED`s and appropriate resistor values. The dotted line is to indicate that the IR LED is separated by a length of wire (telephone cable in this case) from the rest of the circuit. The linux....
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Modular power supplies enjoy disproportional growth. Personnel limitations of development engineers for discrete solutions increase costs, while readily available modules feature lower prices. Aspects such as higher efficiency, easier certification and the....
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Wisp628 is designed to be used as an in-circuit programmer only, hence no socket is provided for the target chip. `Why use such a limited design`, you might ask, `an ex-circuit programmer with a ZIF socket can do the same things and more!` You are partially....
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A tutorial on setting up RS232 communication to PICAXE with circuit diagram, serial cable configuration, PC communication program setup and configuration and sample code for PICAXE....
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Customs by Ripper - Tech page about basic wiring for any vehicle, but motorcycles in particular....
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The microcontroller is able to make about 7000 complete line-following decisions per second, which is almost 7 decisions per millimeter when the robot is going full speed. By upping the clock, unrolling loops, and removing my wireless debugging and....
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Its an adaptation of the 2X 16 LCD project, by adding a fettite loop antenna, two resistors, and a capacitor. Here the display shows the output of the 10 bit scanning voltmeter with Minimum Mass Wireless Coupler. Both the ferrite loop antenna and the....
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To ensure a full-load start-up, the extra circuitry in this regulated boost converter disconnects the load until the output voltage achieves regulation. Proper operation requires a gate-drive voltage sufficient to provide low on-resistance in the switching....
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Automatic lights using a light twist, it TWH87sl power switch integrated circuit composed of a first input terminal TWH8751 O feet to the positive terminal of the power supply,..
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The performance of the 80 meter CW transceiver using the phase method for side band suppression is very good. Construction was easy with all good obtainable standard electronic components and without the expensive or complex crystal filter. Almost nothing is....
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Light Sensitive Staircase Switch with Triac , Operation of the third circuit is much similar except that it has photo sensitivity. The circuit is shown in Schematic When there is no sufficient l....
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The output assign modules uses a 16V8 GAL for address decoding and enable signal generation. Figure 44 shows the pin assignments for the GAL used in the output assign module. The VHDL code used to generate the GALs is included in the appendices, on page The....
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