Popular Circuits Page 166
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When loading a battery during the day from a solar panel it can be partially discharging through the panel after nightfall. This solar panel power switch circuit replaces the diode and connects the panel to battery through a relay contact. When the voltage....
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Below 10 MHz, the realization of engineering models is fairly straightforward and not critically dependent on pc-board layout. At VHF, parasitic circuit elements and spurious coupling can wreak havoc with attempts to achieve performance at low cost without....
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The project consists of 35 LEDs arranged as a 5x7 matrix. This may not seem very impressive but you can display all sorts of effects and treat it like a "window on a large video screen." The project comes with a series of test programs to test the operation....
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This circuit will supply up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance; and it doesn t generate very much heat.The circ....
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With the help of this DC drill speed controller circuit you can control the number of revolutions of your drilling machine. A mini-drill machine is always....
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The objective of this project is to build an Arduino voice shield to empower thousands of voice related applications! All this mostly thanks to an integrated ISD1790PY chip. This particular voice/ TTS feature can be useful to integrate voice messages in....
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The SheevaPlug is reputed to have a marginal power supply. It seems to be more of an issue for the people in the UK running at 240VAC, and it also seems to be a problem to load the USB too heavily, as happens if you want to add an external mechanical disk....
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This instrument is a computer controlled acoustical angklung designed and build in 2000. In 2006 it has undergone a major upgrade of the entire hardware. The anklungs themselves are made of hardened brass and tuned to a western scale covering two octaves.....
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The schematic shown here is a project of a simple temperature sensor circuit or we can also say it a heat sensor circuit, which will activate an LED when receive heat. The circuit is easy to make and using only few components. The two BC547B transistors are....
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Everybody who regularly works with servos will know several instances when such a servo tester will come in handy. The function of a servo tester is to generate a pulsing signal where the width of the positive pulse can be varied between 1 and 2 ms. This....
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This circuit is a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. -In circuit a FET number 2N3819 is main, it is better than a common transistors that a high....
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You wire in some relays and run it in parallel with your key ignition. The wiring schematic is as follows: So do I connect one wire from the 87 terminal (orange) to the red wire, then the blue wire from the next relay to the black wire and so forth I....
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This is a low cost and easy build low powered FM transmitter. The range of the FM transmitter claimed about 300 feets when running at 9V supply. And the range claimed to be increased become about 400 feet when running it at 12V supply. Take....
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This version uses a double sided PCB. Dimensions are approximately the same as the original version.
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Removed the second push button switch and components for the RS232 serial interface.
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Added 22K resistor between MCLR input and Vdd. This....
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This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on hold. The circuit operates as follows: The RED wire from the phone jack is typically positive and the GREEN wire is negative or ground.....
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This is a project that I started back late 2003 when I just starting to learn PIC programming. I wanted to building something that actually did somthing useful. This project is based on a PIC16F84. I actually came up with this idea and then after doing some....
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Miniature vacuum tubes with cathodes of high-field-emitting carbon nanotubes are currently under study at Agere Systems in Murray Hill, NJ. A triode with amplification factor of 4 has been constructed, with an anode-cathode spacing of 220 µm, and a pentode....
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The LM358 series consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also....
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This circuit shows a Car Radio Audio Amplifier Datasheet With TDA2003. This TDA 2003 datasheet has electrical characteristic, schematic wiring ....
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FIG. 3 a king in Figure 5, the circuit OP37 composed of multi-preamplifier o OP37 is a ratio of better performance NE5534 integrated operational amplifier circuit, Table 3-3 li..
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This circuit delivers an initial voltage of 2.5V per cell to rapidly charge a car battery. The charging current decreases as the battery charges and when t....
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In this Tutorial we are using atmega8 with 4 MHZ Crystal and unipolar stepper motors, ULN2003 is Darlington pair driver I.C s used ..
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This device is designed to be a simple, inexpensive ˜comparator, intended for use in a solar cell power supply setup where a quick ˜too low or ˜just right voltage indicator is needed. The circuit consists only of one 5V regulator, two transistors, two LEDs,....
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There are two major types of backlights for LCDs: LEDs, which stands for light emitting diode, or EL, which stands for electroluminescent. EL backlights tend to be more efficient and have more uniform lighting than LED ones, but they require some tricky....
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An issue with CPLD and FPGA devices is that they have so many I/O pins that their schematics become overwhemlingly HUGE very quickly. I tried my best to partition out different sections of the schematic to show the motor control circuit, a-to-d converter....
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My original idea for this project was simply to try and interface the WINTEK WD-C2401P lcd panel to the pic (see my previous post). I figured it would be fun to add a couple of ADC readings to display something useful on the lcd. PORTB on the PIC is used as....
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This a application circuit for calibration. This circuit is called high voltage AC calibrator circuit. In another dimension in sine wave oscillator design is stable control of amplitude. This is the figure of the circuit. In this circuit, not only is the....
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Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently. The major concern is the low input impedance of the detector-amplifier bipolar stage. Nevertheless, it can be easily compensated with positive....
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One of the goals of Movable Party is to provide an interactive experience for audiences/participants. Since power will be generated from a hub motor attached to the rear wheel of each bike (see this post ), the speed of the rear wheel directly translates to....
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This is an application project that uses software W5100 library for network connections, DS1307 for displaying time, software MAX7219 for displaying on 7-segment digits. This project displays a web page where you read the time and change the 7-segment....
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Here is the circuit diagram of an FM remote encoder/decoder using the ICs RF600E and RF600D. These devices are designed to provide a high level of security and operates from anything between 2 to 6. 6V DC. Various electronic circuits like remote control....
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Uses MM5316 alarm-clock IC, originally designed to drive LCD or fluorescent displays, but modified here for LED display Diodes and batteries provide power if AC fails, with blanking of display to extend battery life. Accuracy is poor on batteries but....
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An AM voice transmitter with variable tuning. The antenna circuit is also tuned and transmits via a long wire antenna. Please Note. It is illegal to transmit on the AM wavebands in most countries, as such this circuit is shown for educational purposes only.....
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Circuit is shown. It comprises an infrared sensor head, electronic switches, audible audio circuit, FM radio circuit. Install it in the bank, the Treasury and other chamber or ..
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The inverting input is held low through a 10K resistor when the circuit is powered on but not being used. Whenever a measurement is being made (including calibration measurements where IN is floating), that resistor is disconnected. The circuit is used to....
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A matching Yamaha T-760 tuner. It sounds (and obviously looks) great with the A-760. The cost was 6 euros, plus 16, 20 euros for shipping from Austria. 31-12-2006: Put back an X2 RFI capacitor, cleaned all the switches and pots with De-Oxit, re-checked and....
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This is the schematics of a low cost mic mixer that can be assembled from the components in your junk box. This two channel mike mixer is designed for handling high impedance dynamic microphones. Transistor Q1 can be any general purpose pnp transistor like....
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This logic probe features either high-low (LED) indication or latching operation. When S1 closed, the indication of a pulse is latched and the red LED1 stays on. Piezoelectric buzzer BZ1 used as a beeper to sound that a logic high is preset....
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What you have sounds like something from this type family of sensors. Not really a good choice of sensor for use with a PIC and actually a pretty low end sensor as to accuracy. There is a little more information located here. Personally I don`t see it as a....
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An obstacle avoiding robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It is developed without micro-controller in order to eliminate critical circuits, difficult programming etc. All you want to do is to just....
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A TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting. A 15-V zener, D1, provides the dc reference for operational amplifier U1, whose....
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The circuit is temperature control by fan, this circuit can control temperature and it also indicates the temperature. All the above functions are monitored and...
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This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple heat-sinking,....
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Running Message Display Circuit Diagram. This circuit Based On The CD401IC. Fetures: Light emitting diodes are advantageous, cos smaller size, ....
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The receiver is a tripple superheterodyne receiver with two PLL-guided local oscillators. The first LO (2. 1 GHz) can be set in steps of 500kHz and sets the RX signal down to 188 - 188. 5 MHz. It has a high PLL loop bandwidth of around 20kHz, therefore gives....
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BH-SK-I with the voice of a single bond integrated circuit fabrication touch light switch circuit shown in Figure, the dashed line in Figure 3-40 left section for the general l..
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The Pierce-gate oscillator of Figure 1 is well recognized by most designers, but few understand how to specify the crystal correctly. The crystal used in the topology of
Figure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor....
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BA2181 dimming using ASIC production touch Stepping dimming lights, 4 eup with loud power consumption is low, anti-interference ability, small as stable by bite, make use of se..
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This is the circuit diagram of the simplest single chip AM radio. The circuit is designed around the IC ZN414Z which is a ten transistor tuned radio frequency receiver. The IC has only three leads and is available in the TO92 package. All necessary circuits....
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The most they do is seemingly run the code, but with a few I/Os unfunctional. e.g. half the LEDs it drives work, aseemingly random half. I have tried the Microchip suggested slow power-up circuit without success. Seems like it shouldn`t need it, because the....
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This is a selection of small self-contained alarm circuits. The main features of each alarm are described on the circuit diagram itself. They all have a very low standby current. So they are ideal for battery operation. Each pair of circuits will print out....
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The solenoid requires a certain amount of current to generate its magnetic field. If the solenoid was a perfect inductor, the DC current would rise above all means and would most likely damage other circuit components. However, solenoids inherently have a....
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This is a modified version of the first SSTC I built, the Kaizer SSTC I. It uses the same secondary, topload and driver board. New things is a full bridge of IRFP460 MOSFETs, audio modulation, shielded drivers and a new casing. I took apart a 19 ³ LCD....
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Microcontroller understands only digital language. However, the inputs available from the environment to the microcontroller are mostly analog in nature, i. e. , they vary continuously with time. In order to understand the inputs by the digital processor, a....
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Multiplexed display suitable for LED readouts is provided by circuit using TTL counters to count 60-Hz Iine.When count reaches o`clock, flip-flop M is set on evely cycle. Gate G3 then detects when time goes to 13 o`clock, and clears shift register.Carry....
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6N5P the output impedance of 400 ohms low resistance tube used as a parallel push-pull, the output impedance of a single tube half, and then two-three-plate and pipe used in pa..
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A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in Electronics Now. When the circuit detects that a phone line has been cut, it activates a MOSFET which can be used to....
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Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators....
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BA3822 five-point stereo graphic equalizer integrated circuit has two channels, and the five center frequencies for each channel are independently set using external capacitors. These IC feature a wide operating power supply voltage range (VCC = 3. 5V to....
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This circuit shows a 555 with its trigger and threshold inputs connected together used to energize a relay when the light level on a photoconductive cell falls below a preset value..
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The one-arm bandit circuit is made up of three clock circuits and three counter/readout circuits. A single roll switch, 51, turns on all three clocks at the same time. When S1 is closed, capacitors C4, C5, and C6 are charged through D31, D32, and D33 to....
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This NiCAD battery charger circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. It will fully recharge a dead/unpowered battery in 4 hours and the battery can be left in the charger indefinitely.....
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WB5LUA described GaAsFET preamps for several microwave bands which included an active bias circuit for the GaAsFET. Many devices have come along since then which offer better performance, but require a bias point with different current and voltages. It isn`t....
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Shown for the 2W audio power amplifier. The circuit uses a 14-pin package LM380 as amplifier element, the input signal by the volume control potentiometer..
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Create single, double-sided or multilayer PCBs of your circuits with a single mouse click, using automatically-placed and routed components. All components in TINA are "PCB-ready" and have associated footprints....
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The Microchip PIC 16C84 was one of the first serial in-system programmable microcontroller. I saw PIC serial programmers published in Electronic magazines in 1993. Today, many PIC programmer circuits - for serial and parallel PC ports - are published on the....
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This I2C expansion board for microcontrollers allows you to connect 8 switches or 8 LEDs with only two wires....
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As shown in FIG constituted by RF2103P 915MHz RF amplifier circuit. P1 for the outlet, which P1-1 take power Vcc, P1-2 ground, P1-3 then power down control voltage VB; J1 to th..
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Useful for checking diodes, transistors, triacs, SCRs, resistors, and LEDs, this curve tracer should prove useful in the experimenter`s lab. It displays the volt-ampere characteristic of a two-ter-minal device on an oscilloscope. This is a simple block....
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Controller as shown, including the acoustic-electric conversion and amplification circuit, a clock pulse generator, counting circuit and control circuit. It controls four accom..
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Humidity detector circuit electronic project using common electronic parts..
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Bridge circuits have long been popular for conditioning signals from resistive sensors. These circuits are sensitive to small changes in resistance, and they provide a differential output from a single current or voltage source. But the sensors you connect....
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This is the simple design and sensitivity and selectivity of the receiver are good. This circuit is use a compact three transistor, regenerative receiver with fixed feedback. The circuit is based on transistor as core of the operation. The transistor that is....
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This circuit utilizes the quasi-complementary output stage of the popular LM380 audio power IC. The device is internally biased so that with no input the output is held midway between the supply rails Rl, which should be initially set to mid-travel, is used....
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This is an image Schematic. No Description available...
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This circuit is a dual voltage regulated power supply, +12, -12, 0 volt. It uses the 7812 and 7912 regulators. You need a 18VCT, 1A transformer at input...
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I want to build a voice sound recording circuit that when triggered will play it recorded sound through an amplifier circuit....
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The following circuit shows about Power Amplifier Circuit Diagram. This circuit using 2N3055 Transistor.Features: 500ohm current, 50V optimal ....
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MAX7316`s main technical characteristics are as follow. ? 400kbps, 2-wire Serial Interface, 5.5V voltage tolerance. ? working voltage is 2 ~ 3.6V. ? 8-bit PWM White LED brightness control, global brightness control 16 with additional 16 independent....
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IC5 generates RS-170 NTSC synch. IC1, IC2, and IC3 make up the red, green, and blue video signals that drive the video ..
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Square wave generator with CD4070. with this circuit it can generate square wave up to 2 MHz In this example I use CD4070 CMOS. VDD :...
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This temporary lamp circuit is very helpful in emergency situation or in any application where we don`t have much time to turn off the lamp. Just press the....
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Decided to quench my curiosity and see if a PICAXE-18X chip running at 4Mhz. was capable of this application. I also wanted to have a go at a project from the ground up. Designing the circuit, drawing up the printed circuit board artwork, etching the circuit....
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There are many people who want to listen whats going on in VHF 108 - 132 MHz. This vhf am converter converts a band between 106 and 150 MHz, so you can lis....
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The schematic for this project has been kept super simple with very few parts keeping the total cost very low and assembly time low. The main parts in the schematic are the PIC 18F452, Tilt Sensor and LED Bar. The power regulation circuit is in the lower....
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The following circuit is an improved version of my original Lightning Detector designed to run on a 5 volt supply. The new circuit features a superior RF section with a single resonance near 300kHz and plenty of sensitivity. The potentiometer was eliminated;....
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The circuit here is a A/D converter, that consisting of A2, a flip-flop, some doors and a current sink, is based on a current balancing technique. Again, the stabilized LTC 1052 50 no drift of V input 1 ° C is necessary to eliminate the offset errors of....