Popular Circuits Page 96
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The combination of controller IC LM4651 and LM4652 Class D MOSFET power amplifier IC power amplifier solution provides a high efficiency, suitable for powered speakers, subwoofers and amplifiers car quality. The LM 4651 is a fully integrated conventional....
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This is a circuit of 90-125 MHz Crystal which is very useful for VHF/UHF converters. This circuit provide 5 to 15 mW output. High-quality fifth- or seventh-over-tone crystal type can be used in this circuit. Undesired oscillation never reach above 500 MHz....
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Battery charging circuit, power supply via Q2, Q6, R8, D10 constant current charging the battery. When external power supply, the charging current through R8, D10 to charge the battery, and the charging indicator light D1Figure: Fire emergency light circuit....
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In principle, the square wave oscillator doesn`t have to be a 555 timer, it could be a ring oscillator using inverters as you propose. In practice, using 4000 series CMOS logic for example, the negative output voltage produced would not be able to provide a....
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The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, available on this website since 1999 and built by a lot of hobbyists. Unfortunately, that circuit stops operating when the battery voltage falls....
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The vertical line indicates the instance of the 5th harmonic filter connection Figure 3. Diagram of the power system with the designed group of single-tuned filters for system with DC drive supplied by 6-pulse controlled rectifier:PN = 22kW, UN = 440V, IN =....
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You can use this circuit with any walkman or CD player since it is designed to take a standard 500mv RMS signal. A 15 watt amplifier made using discrete components. Sergio designed this circuit for his Electronics Level II course. This amplifier uses a dual....
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Convert a nice but ordinary chocolate box into a raging LED Blinking Inferno with ATTiny13 AVR chip, Arduino IDE and a handful of electronic components..
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The circuit presented here makes amplitude modulation possible, and it also has the significant advantage that it replaces the somewhat exotic and quite e....
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A very simple audio compressor built with SSM2165 IC. There is no much explication about this compressor circuit schematic, just pay attention at capacitor....
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Before using this or a similar device, their data sheet should be read carefully and any power supply recommendations should be followed to prevent false output pulses.
The receiver module used for this test worked very well under all levels of....
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The 2SK2975 was reportedly been discontinued by the manufacturer and the replacement part was the RD07MVS1 manufactured by Mitsubishi. This device is very similar - but it seems to have slightly higher gain than the `2975 (10 db typ. at 520 MHz versus 8. 4....
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Most thefts happen after midnight hours when people enter the second phase of sleep called ˜paradoxical sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (such as kitchen....
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Laser-receiver circuits must bias their avalanche photo diodes (APD) to achieve optimal gain. Unfortunately, an APD..
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FIG VDI, VD2, Rl and Cl form resistance voltage half-wave rectifier circuit, the output DC voltage 5v supply manifold with electricity. R2 for the manifold provides AC zero-cro..
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C1=1000 Micro Farad aluminum electrolytic capacitor (For loads less than 100mA you can sustitute with 220 microfards capacitor), Voltage rating = 2. 5 times of Output Voltage. C1 = 1000 Micro Farad aluminum electrolytic capacitor(For loads less than 100mA....
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IC Voltage Regulators -Circuit diagram & Block diagram of Linear,Fixed, Adjustable (positive & negative) & Switching voltage regulators....
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The capacitance between the wire and the probe would form a capacitive voltage divider with the probe's input capacitance, and at frequencies significantly higher than the low frequency roll off created by the probe's input capacitance and the probe's....
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This circuit uses a 555 timer which is setup to both runn in an Astable operating mode. This generates a continuous output via Pin 3 in the form of a square wave. When the timer`s output changes to a high state this triggers the a cycle on the 4017 4017....
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This is yet another variation on the "parallel resistor" dummy load. [Go -here- for a discussion on dummy load theory]. This is another one I built during my infatuation with copper pipe. It`s suitable for QRP HF operation of 5-watts or less average power,....
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This is a very simple crystal reciever circuit for short wave band and can be used with headphones...
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The circuit uses the LTC1043 in a variable gain amplifier which features continuously variable gain, gain stability of 20 ppm/°C, and single-ended or differential inputs. The circuit uses two separate LTC1043s. LTC1043B is continuously clocked by a....
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Using MAX1496 an ADC with LED drivers, you can make your own 3 1/2 digit voltmeter with just a handful of components. It even has external/internal Vref, HOLD and PEAK as well as 200mV, 2V rangs....
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Hi All after some though and reviewing feedback, I have adjust my plans to include/remove some functions. This project has already clocked up a few....
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As long as we have a stable voltage reference, a stable voltage source can be produced by amplifying the reference. LM10 provide both the reference and the....
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As shown is a very attractive Christmas lights circuit. When the power is turned on, lights HL will gradually become brighter; when it reaches the brightest, it will automatica..
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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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Digital counter circuit as shown is composed of infrared signal for detection of moving target scan count small device, it is suitable for the production line, to move items on..
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No description available...
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Small (2 to 3 meters) of neon electronic transformer circuit diagram as follows:..
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When a current of air hits tbe piezo element, a small signal is generated and is fed through Cl and Rl to inverting input pin 2 of one section of the LM324. That causes output pin 1 to increase. Resistor R3 is used to adjust the sensitivity of the....
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By the photosensitive resistor television automatic brightness adjustment circuit shown in Figure photoresistor and contrast potentiometer connected to the intermediate head. U..
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TDA 2030 is a widely used 14W audio power amplifier monolithic integrated circuit in Pentawatt [ package, intended for use as a low frequency class AB amplifier. However some home theater prototype came with For low frequency subwoofer amplifier using 2030,....
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An interesting hobby circuit of a crank door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555)....
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This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. When the test button is pressed, the Car battery voltage....
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A Variable DC Power Supply is one of the most useful tools on the electronics hobbyist`s workbench. This circuit is not an absolute novelty, but it`s simple, reliable, "rugged" and short-proof, featuring variable voltage up to 24V and variable current....
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DC current of negative feedback BTL circuit shown in Figure 2, the abolition of the standard BTL circuit C12, C22, the circuit of the DC; resistor R16 and R26 are sampling resi..
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Here`s RF Power Amplifier for QRP with low cost. This circuit is a broadband one from 1. 8 to 30 MHz, so it is "no-tune" and you need only to regulate the quiescent current bias multiturn trimmer of each Mosfets couple. This means also low efficiency (for a....
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So this is a bit of a continuation on my 555 timer based PWM controllers, but now using microcontrollers and MOSFETs instead of 555 ICs and transistors. I made 2 versions, one with switches for speeding up and down and the other with a potentiometer like the....
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When the voltage on the non-inverting input of each comparator exceeds the voltage at its inverting input, the output switches high and illuminates the relevant LED. NOR gate latches are connected to the outputs of the third and fourth comparators. When the....
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A footstepping effort-based locomotion interface is described. Built around an inexpensive and readily-available exercise machine, it provides an effective interface to walk-through VEs....
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Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of the mobile phone battery packs have a rating of 3.6V, 650mAh. For increasing the life of the....
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Well i posted a similar circuit in another topic but a lot has changed in the design. So here is a brief story of what i am doing, actually i am in a project where i have to design a circuit which can be used to trigger solenoid valves for the airbags in the....
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Circuit shown in Figure 6-24. Both ends of the relay coil in parallel with a resistor Rf or auxiliary diode VD, is equivalent to power after a short circuit coil core increase,..
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This circuit is basically simple and easy to build, it uses two transistors as active components and a few passive components like resistors, capacitors and two LEDs.
The circuit makes use of the MPS2222 transistor. You can use any NPN type transistor as....
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Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to....
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This fixed 1-mA current source delivers a fixed current to a load connected between Ql"s collector and ground; the ..
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I managed to program my PIC 16f627 to turn on three LEDs when push button (trigger button) is pressed and start a shut down sequence (basically each LED toggles off one after another with a 5 second delay in between) when another pushbutton is pressed (reset....
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The brake pad warning light is designed to come on when the front brakes wear down to about 25% left on the pads. It is triggered by an insert in the pads that has two wires attached. The wiring and pad is part of a ground loop that starts at the instrument....
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This circuit was designed and manufactured the `80`s. From then it works without problem. It does not present any particular constructional problem, beyond known: the attention in the provided force of power supply - choice suitable heatsink and good....
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This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of the wheel where permanent magnets pass by. The permanent magnets are attached to the wheelspokes and....
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I don`t want to use carbon offsetting, eg planting trees that nominally soak up some agreed amount of carbon/CO2 (for a while), but rather I want to genuinely and measurably reduce consumption and/or (micro)generate some of the energy that I consume, causing....
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12V power inverter circuit using 555 timer circuit electronic project...
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With a magnetic compass ensure that both pickups have a South polarity on the top of the pickup. Verify by reading a North polarity on the bottom of the pickup. You might rarely find both pickups with a North polarity on top. If you find one pickup with....
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We can use boost converter such as TPS61160/1 with a 40V rated integrated switch FET to drive up to LEDs in series. We can use it to reduce output ripple,....
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When the brake pedal is on depressed, battery positive voltage normally applies through the STOP fuse and stop light switch to terminal STP of the ECU, and the ECU turns the cruise control off. A failsafe function is provided so that cancel functions....
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Are you looking for a free schematic and pcb design tool? The gEDA project has produced and continues working on a full GPL`d suite and toolkit of Electronic Design ....
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TA1383AFG integrates an NTSC chroma decoder, multi-point scan sync processor (equivalent to pin D4), and H/V frequency Counter in a 30-pin flat package. The IC is ideal for double scan TVs By Toshiba Semiconductor ..
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The project is a continuation of the 5kW Boost converter project. After a few failed attempts, I realized that I was really after more power, perhaps 10kW or so. I changed the title from 12kW to 8kW. While the converter is designed for 12kW, its very....
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If your amplifier is fitted with two level controls, it actually offers you a balance control and a level control. A draw..
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The schematic has been modified slightly to improve the tone control performance (04 Jan 2002). A new schematic is now on line - the differences are relatively minor, but make the component values for the tone controls a bit cheaper (smaller value caps, and....
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The VLF Converter can be used to pick up signals for the general coverage of shortwave receivers. A number of unusual signals..
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This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! The indicated value of 22 ? for re....
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Everybody likes re-discovering something they did years ago. Here`s a game we all played at school. Possibly under the name of HANG THE BUTCHER. The game is quite simple. One player thinks of a word and writes down the number of letters in that word in the....
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Depending on its design an electric guitar may have anything from one to six pickup elements. Classic (acoustic) guitars could also benefit from one or mo....
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Filament Light Dimmer Circuit This simple triac dimmer can be used to control incandescent filament lamps up to 200W. The circuit operates on....
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Using PC`s parallel port is a convenient way to control a stepper motor. For unipolar stepper motors, up to two motors can be controlled with the 8bit data line. The standard way of connecting a unipolar stepper motor to the parallel port is to use a....
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The potensiometer adjust the trigger on` level. The diode in the circuit diagram shows to be 1N914. This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. Use a 1N4001 (or better) instead. A couple of....
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Included on this page are various small circuits I have created over time. Some are trivial, some are a bit more complex, but hopefully all are useful in a variety of projects. Most include both the schematics as well as the source ( KiCad ) files. This is a....
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Clean the surface to be glued components to the printed circuit. Use a sheet of very fine sandpaper to smooth bumps fortunes. First attach the resistors and diodes. Pay attention to the polarity of the diodes! Then glue the two finished watching the first....
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This circuit came from a need for a quick and dirty network tester that could be operated by one person. All the commercial units I tried required a person at the other end to check the remote LEDs, as the transmitters could not be made to cycle through....
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Two simple arrangementsfor resistive loads are shown in A & B. The circuit in A will provide load power when the actuating contact is closed, and no power when the contact is open. B provides the reverse of this action-power being supplied to the load when....
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An overvoltage protection circuit is a circuit which protects electronics from excess voltage, which could potentially damage or destroy electronic components. In this project, we will build a simple, yet effective, overvoltage protection circuit using a....
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A surprising number of modules still have an interface based on RS232. No wonder, as RS232 is easy implemented on a microcontroller with two I/O pins and a line driver such as the MAX232. In the case where the master is a PC, the serial port is relatively....
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Burr-Brown OPA541 chip is produced by a power amplifier, which can by a maximum of 40V power supply electricity to produce the maximum..
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infrared remote controlled switch is second remote controlled project in this website using 555 ic circuit diagram with description of remote controlled switch...
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The circuit was built on Vero board and tested using a large value electrolytic capacitor instead of a battery. The 500 ohm preset resistor sets the actual output voltage. The 47k preset controls the hysteresis and sets the voltage at which the charger....
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I have a 89 seris RS232 programmer but my computer has no RS232 connector so where i have to connect rs232 cable Is any converter for RS232 to usb....
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Application circuit of the device as shown in principle. In the meter, the voltage and current coil and the coil is connected to the power line, whether or not connected to a l..
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Hi, I`m trying to build a circuit with two key switches, where both key switches need to be closed for the current to go through. I am trying to use a ....
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It should be painfully obvious that the positioning of a coil by a millimeter one way or the other could decide success or failure. and when you`ve got 10s of millimeters as a possible position, the chances for INCORRECT positioning, and thus FAILURE, are....
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Input Amplifier Module: a low noise circuit equipped with a variable voltage-gain (10 - 100) pre-set, primarily intended as high quality microphone input, also suitable for low-level line input. High-quality modular design.
9V Battery powered - Very low....
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If you are interested in model aeroplanes and have the capital, a radio controlled electric park flyer is a must have. An RC aeroplane under 400 grams floats around like the rubber models of my youth and contact with the ground doesn`t seems to involve that....
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A quick circuit showing how to control the speed of a DC motor with a potentiometer with your Arduino board. Also shows how to use a TIP120 transistor to allow the Arduino control a larger power supply...
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A SIM Card also known as Subscriber Identity Module, A SIM is a Smart Card that can store data from a cellular phone. Those data like identity, location and phone number, network authorization data, personal security keys, contact lists and stored text....
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