New Circuits Page 117
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The main features of this powerful MULTIWATT Package (a trademark of SGS-THOMSON Microelectronics), a power amplifier IC chips designed specifically for car radio application, are the high current capability (3. 5A) and the capability to drive a very low....
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A couple of changes on the dead band and Pulse Stretcher resistors, and the Position feedback potentiometer has been hacked around to function as a "zero the speed" or "center your transmitter sticks". The rest is just the addition is a fairly traditional....
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In the old days it was very simple to use the parallel port of a standard PC and program just about any type of AVR microcontroller with it. When you want to do that now, you`re first obliged to buy aprogrammer that communicates with the PC via USB, which....
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This is a design for a door alarm circuit, but in this design using electronic system. This circuit uses a synthesized sound chip from Holtek, the HT-2811. This circuit reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit....
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This circuit is a modified Hartley oscillator with a couple of extra components included. The transformer is a small audio transformer, type LT700. The primary is center tapped with an impedance of 1Kohms at 1KHz. The secondary has an impedance of 8 ohms.....
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Although this design is reproduced directly from the manufacturer`s datasheets, its use in this application is rather novel. Originally intended for high-visibility LED bargraph readouts, here the LM3914 is used as the basis of a 10-step variable brightness....
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When the oscillator starts up, Q2 is conducting; the current comes from the capacitor, charging it until the voltage across it is large enough to get a current across the inductor. As the current across the inductor peaks, the output voltage rises (the....
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The OpenRelief project is building open, modular information solutions for disaster relief , and as part of which they`re developing a range of network-enabled sensors. I offered to help out by prototyping a radiation detector, opting to use an ionisation....
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The number of the pulses of the input can be confirmed by seeing it with the eyes by putting the light-emitting diode to the output of the counter ....
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A wide-range voltmeter circuit. This inverting amplifier has a gain varying from -30 for the 10-mV full-scale range to -0. 003 for the 100-V full-scale range. Diodes D1 and D2 provide com-plete amplifier protection for input overvoltages as high as 500V on....
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This circuit produces a very high voltage and care must be used to prevent getting a nasty shock. The transformer can produce over 1, 000v and the 8-stage multiplier can produce up to 20, 000v..
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Voltage regulator ICs (78xx series) provide a steady output voltage, as against a widely fluctuating input supply, when the common terminal is grounded. A....
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From 230 V AC a DC supply of + 5 V is obtained. The power supply is given to the other blocks. The pulse generator at a particular frequency generates the clock pulses. The clock pulses are counted by a counter and gives output after every 10 pulses. The....
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This is a design circuit for a doorbell. This circuit can produces a sound like bird sound. This circuit controlled by transistor NPN. This is the figure of the circuit. The operation of the circuit is beginning when P1 is of experimental value. Start with....
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This circuit be signal sound expansion from condenser microphone give with small-sized loudspeaker. It compose the importance is part pre mic use transistor just one enlarge sound signal gives the power goes up change come to a part amplifier with the....
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In this version of the oscillator, Rb is a small incandescent lamp. Usually R1 = R2 = R and C1 = C2 = C. In normal operation, Rb self heats to the point where its resistance is Rf/2. A Wien bridge oscillator is a type of electronic oscillator that generates....
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hi everyone! my first post (for quite a while! lol!). i obviously haven`t still got an old enough tricky dicky catalog! in the data section there used ....
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PIC Programmer Circuit diagram Following uJDM PIC programmer circuit is a circuit which suitable to do simple pic16f84, pic16f84A, 16c84,....
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A solar charger for an iPod is no more difficult than making our Solar battery charger. Built in iPod batteries are 3. 7 Volts with the capacity (measured in mAh) dependent on the type of iPod - e. g. 1, 200mAh for a 2nd Gen, 850mAh for a 3rd Gen, 500mAh for....
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Differential temperature sensor is used to measure temperature difference in two different area. Here is the schematic diagram of the circuit: Please note....
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The FlexiForce sensor acts as a force sensing resistor in an electrical circuit. When the force sensor is unloaded, its resistance is very high. When a force is applied to the sensor, this resistance decreases. The resistance can be read by connecting a....
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CMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often require quite a bit of current. We therefore propose this oscillator circuit that has a very low current....
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Here`s the Arduino code for reading incoming packets from the XBee and displaying the received analog sample on the LED display. Parsing an XBee packet is quite complex, unfortunately. But after studying the documentation for a while, it isn`t that hard.....
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An IDE interface board and I`m currently working on the driver software to support reading/writing on a hard drive under my OS-X 2. 0 RTOS. An assembled IDE interface board is shown below. Download pcb. zip which contains the schematic and PCB layout files....
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The battery charger circuit below is very simple to build requiring only a handful of cheap parts and an extra winding on your power tranny (or a separate tranny). Since the charger described is not active during sound reproduction, I have made no criteria....
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Two reasons why LM101 is well suited to comparator applications are it has a large differential input voltage range and the output is easily clamped to make it....
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The hardware within this circuit involved a Picaxe 18M2 IC which is the programmable micro-controller in my design which can be programmed using a PC,....
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If you had time to experiment with the ALF type SE circuit you may have discovered some of its shortcomings with regard to a Power Smart Head adaptation. The problem is that HCMOS gates are power hungry when used as SE voltage comparators when the analog....
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This audio amplifier circuit delivers up to 200 W of top-class quality for loudspeaker from 4 to 16 ohm. Operating voltage is between 24 and 36 V, max 5 A ..
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This Photo Instructable shows how to use two old phones as a cheap intercom between Point A and Point B. Might be useful between the house and the sh....
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A 2m ham radio transceiver that includes all the necessary circuitry, in particular the voltage-controlled oscillator ( VCO ) + phase-locked loop ( PLL ) for frequency synthesis, low noise amplifier ( LNA ) for the receiver front-end, power amplifer (PA) for....
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This 2 meter 144 MHz fox hunt transmitter is used in amateur competitions where a hidden transmitter is to be ""hunted"" using mostly homebrewed receivers an....
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If the unit has been sitting idle for a long period time (dead AAA batteries) and you see only garbage on the display or the unit doesn`t operate, the first item required is probably a new internal lithium battery. Although the unit was exceptional for its....
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In this page we will introduce a great project designed by Toon Beerten. His project named "DIY Led Mood Lamp" can become a very interesting add-on for your room that`s absolutely sure it will impress everyone. As you can see on the photos, we talk about a....
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The sine input is ac coupled by capacitor C; R1 and R2 bias the input midway between Vn and Vp, the input threshold voltages, to provide a square wave at the output. ..
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When the weather is hot with the sun beating down the car won`t start and radio, keyless entry, power windows, power locks, radio, and power seat wont work. After the sun sets everything functions again. Have you checked to see if the headlights function....
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Using technology developed by Dr. Royal Rife, Gary Wade has invented an ultrasound scanning rife device that kills harmful microbes and pathogens with multiple frequencies. Many articles on this site tell how....
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The transmitter is built on a Printed Circuit Board. This board uses track inductor for L1, L2 and part of L3. The section built around Q1 is the oscillator section. Oscillation frequency is determined by L1, C4 & C5 which forms the tank. Actually C5 is the....
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A MOSFET solid state kilowatt amplifierplifier using MOSFET`s. Helge`s work was followed by articles that appeared in QEX and QST by Joel F. Paladino, N6AMG. Since then, very little has been written in amateur radio publications concerning MOSFET`s in....
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Medical and industrial applications often require galvanic isolation of 2500 V ac or higher for the safety of patients and equipment operators. The isolation barrier conveys not only power to the sensing element, but also data to or from that element. Each....
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The sensor/monitor shown in the diagram wakes up` the host system on detection of infra-red (IR) signals. It draws so little supply current that it can remain on continuously in a notebook computer or PDA device. Its ultra-low current drain (4 µA maximum, 2.....
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This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses two identical integrated preamp circuits. The second preamp is used in identical manner for the second....
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I am driving a piezo disk at 100 Hz (or less) and am limited by the output of my signal generator to 10 V. I wish to amplify that to 50 or even 100 Volts. How to do ....
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You can make an LCD show a brief moving message by interfacing it to a microcontroller. Here`s an AVR-based moving-message display that uses a 16G—2 LCD display incorporating HD44780. The 16G—2 LCD can display 16 characters per line and there are two such....
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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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SFH505A made by Siemens combine infrared diode receiver, amplifier, demodulator and a filter band pass for minimizing interferences. This circuit works tog....
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Construction of a radio telephone integrator and created my first radio phone / repeater. I had been playing with electronics and radios since that first receiver I had built back in 1973. With that simple receiver and a random wire antenna I had discovered....
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The current sourcing/sinking capability of the I/O pins on Raspberry Pi is quite limited. According to the Wiki page, the current limit for each I/O block (e. g. GPIO0 through GPIO27 combined) comes at only 26 mA maximum, which is only capable of driving a....
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The following circuit shows about? Remote Control Toy Car Schematic Circuit Diagram. Features: does not impose on the performance of the original ...
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Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, engine control with injection calculators, airbag activation, or other various functions, called comfort functions. Among them is one which we tend to....
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This is Operational an Amplifier (Op-Amp) Oscillator circuit. This circuit has some advantages, they are this circuit can be operated at low frequencies with...
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Ideal to operate 3 to 24V DC existing on-circuit lamps This circuit was designed to provide that continuous light lamps already wired into a circuit, beco....
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Irisys is offering a range of five thermal imaging temperature sensors based on a 16G—16 pixel array offering a choice of temperature range, accuracy and measurement angle. The IRI 1041, IRI 1051 and IRI 1061 are respectively identical to the IRI 1011, IRI....
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This approach can be demonstrated using the rather unusual semiconductor power flip-flop described here. A flip-flop is a toggling circuit with two stable switching states (bistable multivibrator). It maintains its output state even in the absence of an....
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This level liquid sensor electronic circuit diagram is based on a common Ca3410 operational amplifier IC. This level liquid sensor electronic circuit use two plates sensors ( two probes ), one for the high level an one for low level. If the level of the....
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Hello, I`d like to automate some functions in my house, particularly, turn on and off CFL lamps with a triac coupled to the logic via a zero crossing....
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There are currently several nice ICs available that contain a nearly complete receiver. This project is a complete FM receiver circuit with excellent receive and sound qualities. The only disadvantage of using this IC TDA7021T from ST-NXP Wireless, from the....
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The LT5575 is an 800MHz to 2. 7GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for communications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth....
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This AM radio circuit is a low power transmitter working on broadcast band. The simplicity is implemented using a single-transistor amplifier stage, and for....
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Here is the schematic of a water level alarm circuit. The circuit will work as a water level sensor and will give a melodious alarm sound when the two probes in the circuit will detect water. You can use this water level indicator circuit to detect the level....
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By combining a common 78L05 with an integrated audio amplifier of the type TDA2030, an adjustable voltage regulator can be constructed in a very simple manner that works very well. The output voltage is adjustable up to 20 V, with a maximum current of 3 A.....
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The TDA7000 has an FLL (Frequency-Locked-Loop) system with an intermediate frequency of 70 kHz and the selectivity is obtained by active RC filters. The only function which needs calibration is the resonant circuit for the oscillator (for the reception....
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Timelord, one of our top member is working on a great project: a complete apartment air conditioning based on airflow. You can check out his idea here http....
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Based on the SN74LS194 - Bidirectional Universal Shift Register the circuit is designed to drive UNIPOLAR type stepper motors and provides only basic control functions - Forward, Reverse, Stop and Speed adjustment. For the purposes of this page the direction....
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The TDA1519 circuit can deliver 2x6 watts output power. TDA1519 is an integrated class-B dual output amplifier in a 9-lead single in-line (SIL) plastic medium power package is primarily developed for car radio applications...
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Hi all, My 6 year old son and I saw this on youtube I then pressed `print screen` from the video to cobble together this: ....
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The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1 = 1uF 25V C2 = 220uF 25V R1 = 2.2K Ohm Q1 = 2N3904 / 2N2222 D1 = 1N4148 / 1N4001-1N4007 K1 = 12V SPDT Relay / Any approp....
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This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward voltage with temperature necessitates the use of a 350mA, constant-current power source as provided by....
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This simple alarm circuit was designed for use in a combined garage and rumpus room. It can be assembled on Veroboard and uses just one IC plus a handful....
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Infrared transmitter and receiver circuit shown in the schematic diagram below can be used as remote control. The transmitter is basically an oscillator....
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An 8051 program must interact with the outside world using input and output devices that communicate directly with a human being. One of the most common devices attached to an 8051 is an LCD display. Some of the most common LCDs connected to the 8051 are....
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Crystal oscillator circuitis a simple oscillator circuit when we look at the schematic diagram. A crystal oscillator circuit is nothing but a replacement of an ordinary oscillator network, which is a combination of LC. This simplicity is also reflected in....
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ISP is a way to serially program your microcontroller, while it resides in its place, in other words, without removing the chip from your board. Whether you`re just starting in the ATMEL microcontrollers, or you`re familiar with it, ISP (In System....
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The core of any transmitter is usually an oscillator circuit, and in simple transmitters (i. e. , QRSS devices), it`s often a crystal. Frequency adjustment is accomplished by adjusting capacitance to ground on one of the crystal legs. Simple oscillators such....
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A small biped walker made of 2mm plywood. Powered by two RC servos. it is a popular microcontroller, easily available and programmable now as flash microcontroller 16F84. This simple circuit can be used to program the PIC16F84 and similar "flash memory" type....
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simple siren or alarm using MC1458 dual op-amp and audio power amplifier LM380 circuit diagram with descriptions various siren, doorbell, alarm circuit with parts list...
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This is a TV transmitter for transmitting video of various video sources such as video cameras, Satellite receivers, DVD players, game consoles, etc. TV transmitter`s circuit is working on the 470-580 MHz frequency and can be received on UHF channels 21-34.....