Popular Circuits Page 29
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A 30 to 50 cm whip antenna provides reception from 10 MHz to over 220 MHz. T1 BF981, a dual-gate MOSFET, provides low noise, high-input impedance and high....
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These Intersil RS-485/RS-422 devices are BiCMOS 3. 3V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil family is specified for 10% tolerance supplies (3V to 3.....
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Using two gates from a CMOS 4011 NAND chip, a simple aquarewave oscillator can br made. Alternatively a CMOS 4001 chip can also be used, or a TTL equivalent. In this circuit the mark space ratio can also be independantly controlled by varying the value of....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. a 32. 768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second....
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LPG gas is supplied in pressurized steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement. This can cause fire or suffocation if not dealt with. Here is a....
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Assemble the circuit on a perfboard or pcb except the inductor. Attach two long wires at the place of the inductor. Use a long rod and place the induc....
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The 555 Timer IC worked in three operating modes: monostable, astable and bistable/scmitt trigger. Here we will provide you with article of its astable mode...
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This simple circuit will produce an alarm whenever the temperature falls below zero degree. A thermistor is used here to sense temperature. The op-amp LM7215 is used to compare the reference voltage and voltage from the thermistor network. Reference voltage....
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One interface that is missing in the Lego MindStorms system is an electronic ear. We don`t mean that the RCX should respond to spoken commands (which requires a large amount of electronics and software), but it would be handy if it could respond to basic....
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An amplifier built to drive my Sennheiser HD-600 headphones. Because of the relatively high impedance of these phones, I wanted plenty of voltage available to drive them. Because of the large dynamic range possible with these phones the system had to be very....
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Any power supply and distribution sector should phase sequence detection Huan Jj means to ensure stable power supply phase sequence unchanged. Any irreversible electromechanica..
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This converter allows reception of signals below 500 kHz on a 3.5 ? 4 MHz HF receiver. It should therefore be useful for those with receivers that do not receive the lower frequencies. Again the converter uses the popular NE602 mixer/oscillator chip. A cheap....
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Here is 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....
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There are many circuits for low voltage regulators. For higher voltages, such as supplies for valve circuits, the situation is different. That s why we de....
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Shows the use of the MP3 player memory chip ACU7505 clamor circuit, in order to meet total machine CPU and MP3 decoder core..
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Water is a precious resource in many parts of the world, and many people rely on water tanks to supplement their water supply by storing collected rainwater or water pumped from a well or bore. But how do you measure how full a tank is Tanks are constructed....
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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply Oscillator an electronic ci....
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Digital Electronics Tutorial about the Logic NOT Gate also called an Inverter and the Logic NOT Gate Truth Table used in TTL and CMOS Logic Gate circuits....
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This converter enables reception of 800 to 1000 MHz on any scanner covering the 400 to 500-MHz range. The converter can be set up to cover either 800 to 900 MHz or by readjustment 900 to 1000 MHz. Sensitivity is very high because of the GASFET front end. ..
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T-121 temperature sensor electronic thermometer circuit diagram shown below..
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Circuit diagram is a simple but effective circuit intercom circuit is based entirely on transistors. Circuit diagram is based on three stages plus RC amplifier. When the pushbutton S2 is pressed, the amplifier cord around T1 ...
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This simple DC motor control or PWM circuit using 555 IC can be used to control the speed of a DC motor. The circuit is very simple and can be built in very short time if all parts are available with you....
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This the circuit AC dimmer low voltage For lamp 6V. While this friends may don`t see the advantage of this circuit. But I thinks first step advantage be something get learn the work of Triac. And have tall safety, because of use AC Low Voltage. Which the....
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This project started from seeing pages describing arcstarters that could be constructed for practically no cost from stuff just laying around in the typical tinker`s shop. It has been a fun project, but I have a basement crammed full of stuff and I still had....
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If a linear feedback amplifier contains reactive elements, and at some frequency the loop gain Ab = -1, sinusoidal oscillations will be obtained. The sine wave oscillators investigated in this experiment consist essentially of two separate but connected....
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This 2 Watt FM transmitter will provide 10km range in good weather conditions. Use dipole antenna for maximum range. Transmitter can be tuned between 88-108 MHz with c5. BB204 could be replaced with conventional led (big) with reverse bias (no light given in....
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I built one of these with the RS-232 option many decades ago. It a three channel HF receiver (5, 10 & 15 MHz) that receives either the U. S. or Hawaii WWVH time and frequency broadcasts and displays the time to a tenth of a second. It also has a discipline....
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The circuit requires neither a battery nor an ac supply to make it work. Set the recorder to the record position and ..
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As shown in Fig range is a frequency of 400 ~ 850MHz UHF amplifying circuit. Printed circuit For best performance and results, the circuit should be used by the silver tin processing...
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This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games....
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Happened to have in my NIXIE collection a single beautiful giant ZM1042 (for the record, I got it from Jim Oostveen). For me it was obvious that a single digit NIXIE clock built around this tube would be just the thing for Geert. Some time ago, while....
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This circuit operates two LED strips in pulsing mode, i. e. one LED strip goes from off state, lights up gradually, then dims gradually, etc. while the other LED strip does the contrary. Each strip can be made up from 2 to 5 LEDs at 9V supply. The two....
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The following diagram is the schematic diagram of 4 transistors FM transmitter circuit designed by Paul K. Sherby. Components List: R1, R2, R8 = 1K R3 = 100K R4 = 150K R5, R7 = 10K R6 = 220 ohm R9 = 10 ohm P1 = 5K trimpot D1 = 1N4002 Q1, Q2 = 2N3904 Q3, Q4 =....
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This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for buried coins discovery that is not sensitive enough but you can detect pirates treasures! The metal....
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Because power MOSFETs offer high power gain at both audio and radio frequencies, they are useful in many areas of radio-circuit design. For rf applications, a MOSFET"s large safe operating area, V0 s vs ! 0, protects it against damage from reflected rf....
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The HV732 is a complete, high-speed, high voltage ultra- sound transmitter pulser. This high performance CMOS in- tegrated circuit (IC) is in a single 7x7x0. 9mm 44-lead, multi- die, QFN package. The HV732 CAN deliver up to a ±2A source and sink cur- rent to....
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The XC61H series is a highly accurate, low power consumption CMOS voltage detector with a delay circuit. Detect voltage is accurate with minimal temperature drift. Output configurations are available in both CMOS and N-channel open drain. Since the full....
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The Comtech has become the de facto standard now for those entering the Amateur TV scene. Sadly the production may be coming to an end with the lower demand for analog tuners and the ICs used becoming obsolete. With the demise of the G1MFG website there is....
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The Antenna Combiner (A3021) is an active combiner for four 50- © coaxial antenna connections. The output is a combination of the four inputs with net gain of roughly +11 dB. The A3021 is intended for use with four Loop Antennas ( A3015B ), each of which is....
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A resistor-capacitor circuit spark blowout. It is the coil magnetic energy is converted to electrical energy capacitance C, so as to eliminate fire took aim, eliminating the sp..
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It allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. Component: 555IC, Transistor, Resistor, Relay, Polarised Capacitor...
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This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC`s and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a "system....
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There are applications where a particular band, or spread, or frequencies need to be filtered from a wider range of mixed signals. Filter circuits can be designed to accomplish this task by combining the properties of low-pass and high-pass into a single....
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Radio FM radio chip circuits use different, it works slightly different, as shown in the use of DA-101 chip FM Figure radio circuit. ..
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This circuit was submitted and design by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range....
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The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors are off. When the push button switch is pressed to 10u capacitor will charge via the 22k resistor. This....
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An AC triggered Multitone, polyphonic doorbell. It gives eight melodious tunes for 2 minutes. On each press it will give a new tone which will continue till the melody is over. The circuit is too simple and battery operated It uses the popular melody....
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In operation, the TL3019 device will activate, or become low, when a south pole of a magnet comes near the chip face of the device. The example shows five doors. Each door has a magnet embedded in its edge with the south pole facing the outer surface. At....
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This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply.....
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Three CD4007 A IC packages perform the switch function using a 10-V logic level. A single 15-V supply provides a positive bus for the follower amplifier and feeds the CA3085 voltage regulator. The scale adjust function is provided by the regulator output....
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Those of you who frequently use devices that work on battery or you need a negative trend at the moment you have a single positive, will definitely look for a converter like the one described below. Constructing it, you can convert a positive voltage of a....
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A 741 op amp is employed as a voltage comparator. The noninverting input is connected to zener reference source. Reference voltage is 5V. R2 is adjusted so that the voltage at the inverting input is half the supply voltage. When supply is higher than 10V,....
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High speed 0.2 to 18 GHz frequency range 80 dB isolation Non-reflective Low VSWR and insertion loss Small size, light weight...
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What is a circuit breaker? When do I need an ac power line filter or a phone line filter; How do I design a noise filter; Can I build a homemade surge protection? The following circuit protection can provide several protections you can experiment yourself at....
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Protect your valuable laptop against theft using this miniature alarm generator. Fixed in-side the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm....
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Unlike other alarm circuit that provide normally-open only or normally-closed only configuration, this alarm circuit work for both configurations. The....
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Photos, detailed descriptions and schematic diagrams of W2DTC`s homebrew 3CX3000F7 triode HF linear RF amplifier....
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The circuit diagram of an Automatic Street Light Controller Circuit is explained in this post....
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It`s a single integrated circuit with EEPROM, Ram, Analog to Digital converter, a lot of digital input and output lines, timers, UART for RS 232 communication and many other things. The best is however that a complete programming environment is available....
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Infrared light is electromagnetic radiation with longer wavelengths than those of visible light. Infrared light is used in industrial, scientific, and medical applications. Most of the remote controllers use IR light to send information. This protocol was....
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This simple combination lock accommodates codes from 1-9 digits long, with the only restriction being that the same digit cannot be used twice. The circuit shows strapping for a 4-digit code, in this case "2057". Any unused switches are strapped to ground.....
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Circuit shown in Figure 3-138. The line is also using the principle of energy storage capacitors discharge achieve braking. Capacitance C and resistance R parameters from the m..
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This circuit design was used to switch on device via a LED photocell arrangement (optocoupler) using components R1, C1, D1 and Q1. It produces a delay on powering up to ensure correct sequencing of certain equipment. A very simple delay timer using a....
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The use of electrically excited gas discharges significantly predates the invention of the incandescent lamp. Physics labs of yesteryear as well as today have use of a variety of gas filled tubes used for numerous purposes involving light generation....
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Metal detectors are usually very complicated and it may be consist of very costly components and metal detector DIY circuits are rare. However this metal detector hobby circuit can be constructed by only a few components such as BC548 and an ordinary AM....
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Following the same idea as the Chipstein and Cornell designs, the circuit uses an instrumentation amplifier (the AD620) to take the voltage difference between two spots on the body. A second amplifier (the CA3140) amplifies this differential signal. A....
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The photo above clearly illustrates phase angle control: output voltage controlled by the gate drive signal applied to a thyristor. What is phase angle control That is what I`m going to talk about in this article. Phase angle control is a method of PWM....
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The mentioned shunt-feedback configuration also allows the easy addition of frequency dependent networks in order to obtain an useful, unobtrusive, switchable Tilt control (optional). When SW1 is set in the first position a gentle, shelving bass lift and....
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ISP programmer with circuit diagram for AVR Atmega32 micro controller.This ISP burner circuit is an adaptation of Pony programmer and uses ponyprog software....
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This is a collection of phono (black vinyl for the youngsters) preamps and equalisation circuits, one of which is sure to meet your requirements. These are not my circuits, but were contributed by a reader (see above), so I am not really in a position to....
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Automatic door control circuit diagram. Human motion detection using the new pyroelectric infrared detection module HN911. VT used as a delay control by adjusting potentiometer..
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The circuit can be used to simulate large capacitances using small value components. With the values shown and C - 10 µ¥, an effective capacitance of 10,000 µF was obtained. The Q available is limited by the effective series resistance.
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This circuit can control a small DC motor, like the one in a tape recorder. When both the points A & B are "HIGH" Q1 and Q2 are in saturation. Hence the bases of Q3 to Q6 are grounded. Hence Q3,Q5 are OFF and Q4,Q6 are ON . The voltages at both the motor....
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The biggest struggle with flashing DVD drives on Xbox 360s has been the price tag of the probe to extract keys on some drives. The probe and kit is required to extract the DVD key, which is needed to perform a drive repair, flash, or backup of any kind. Who....
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With 4 batteries (as for instance in the flashlight) it is possible to produce per hour hydrogen and oxygen in a quantity which corresponds to regular grade fuel in approximately 42 litres. Until the batteries are exhausted, they produced for calorific....
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My coolant level alarm has been working for the last 6 years, the alarm started to go off fairly regularly, although every time I checked the expansion tank, there was no problem with the level of coolant. Even with a cold engine, and using a screwdriver to....
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The circuit of active shortwave antenna presented here boosts weak shortwave signals so that these can be heard with enhanced clarity over a shortwave receiver. Further, the receiver doesn`t require any physical connection as its placement in the vicinity....
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This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly....
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This page documents instructions for use of the Innovatia Renesas M3850A microcontroller programmer. The following design uses a DB-25 type parallel-port cable, and requires MS-DOS 6. 22 or earlier. This is because Microsoft Windows restricts access to the....
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A very simple and efficiency Lithium battery charger and monitoring system, can be designed using the LTM8061 integrated circuit, designed by Linear Technology. The LTM8061 IC is a high efficiency 32V, 2A Module standalone Lithium battery charger optimized....
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Article explains how to layout a standard MAX16922 automotive PMIC (power-management IC) to maximize performance and minimize emissions....
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Digitally controlled potentiometers are useful for generating analog control voltages under the control of a microcontroller. In some applications, manual pushbutton switches could replace a microcontroller and simplify product design. Mechanical switches....
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By using diodes in place of pull up resistors, and by isolating the DC load from the trigger circuit via junction drops and the 10nF capacitor. If there is too much power comming from the solar cell then the motor might run too often or even continuously.....
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The same equations can also be applied to D2, R5 and R6 which forms the negative non-linearity of the circuit, although all the signs should be inverted for the threshold voltage equation. Between the positive and negative threshold voltages, only the....
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This is transistor inverter circuit diagram 100watt it sizes are easy circuit. Because of use the all transistor, have no the integrated circuit. It performs to modify from battery 12V be 220V 50Hz signal square wave. By the circuit works with transistor....
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The computer needs at least 180 millivolts peak-to-peak and the condenser microphone in my headset produces about 20 millivolts peak-to-peak into a 2.2k load with normal speech levels. There are USB ports on the machines, so I can use that for +5 volts.....
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This circuit was built to stabilize a radio frequency VFO (Variable Frequency Oscillator) for ham radio applications. The circuit has also been used to lower the drift of a Ramsey FM10a micropower FM transmitter...
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Here is a simple LED night light circuit which can be used as a room night lamp. The circuit is simple and can be built with few components. The circuit is using four LEDs to perform as a night lamp. You can use blue or white colour LEDs or any other colour....
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Introduction The ignition Timing lights in common use range from simple neon to complex units. Neon Timing lights have a drawback that due to their low light output, the user is forced to operate them in subdued lighting. This becomes a safety hazard as one....