Popular Circuits Page 276
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It`s based on an LM2917 and an SCR, which has the very nice side effect of being impossible to generate any mis-timed sparks, a highly desirable attribute for high output rotary engines. When the limit is reached by accelerating to the rev limit, the....
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Door alarm here with a time recognition, the owner opened the door is normally open the door, open the door to complete the action within the general 30s, so it does not alarm,..
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F to turn a water magnet, the stator coil into 4 groups. 4 stars all set of coils through mediums P pulse signals by the rotor control number, so as to form a rotating magnetic..
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Circuit shown in Figure 3-201. The circuit has two starting resistor, starting resistor controlled by the time relay cut; SA by a master switch to control the motor reversing o..
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This is a two-zone alarm - with automatic exit, entry and siren cut-off timers. It can be triggered by the usual types of normally-closed input devices - such as magnetic reed contacts - foil tape - PIRs etc. I`ve used a 12-volt supply in the diagram - but....
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I am using BQ24020 charger IC to charge 120mAh Li-ion battery. I set the charge current to around 100mA. Attached is the circuit schematic. The problem I am facing is STAT1 and STAT2 signals indicate that battery is fully charged even though battery charge....
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This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. An on/off switch is not....
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The total dollars count for all parts is much smaller that the cost of an heavy duty DPDT foot switch. As seen on the previous page suggested electronic switch circuits can be made easily and I have found that their applications is justified. New mechanical....
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As shown, by connecting the two FETs, and form a CMOS digital inverter. ..
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The circuit uses a total of six, 12 volt lead acid batteries to power the load. 3 batteries are wired in series to create 36 volts. The total discharge current is 30 Amps. 3 batteries are wired in parallel to create 12 volts The total charge current is 10....
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This is a simple design for Voltage Regulator Circuit using pass transistor. The design has built by LM317T. The LM317T output current can be increased by using an additional power transistor to share a portion of the total current. The amount of current....
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This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must....
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It has a strong anti-jamming capability, suitable for demanding applications. Circuit by the phototransistor VTi, Schmitt trigger H005, JK flip-flop H013, power amplifier circuit VTz relay KA and actuators and other components. ..
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I am attempting to build a distortion circuit using 1 12AU7 tube as a diode. I know that the circuit is primitive but really its only to add in the ex....
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Quartz crystals have the property that their amplitude/phase characteristic repeats itself at frequencies that are an uneven multiple of the fundamental f....
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AN79 Linear Technology AN79 modifies methods presented in AN74, permitting verification of 30 nanosecond amplifier settling times to 0. 1% resolution. sampling-based technique used is detailed and results presented. Appendices cover oscilloscope overdrive....
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Figure (a) is the infrared emission circuit that composed of 12 the keyboard and S2559. Figure (b)shows DTMF decoder circuit and channel control circuit composedof the MT8870. Figure (c) is the voltage amplifier circuit composed of two-op ampLM358....
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In order to prevent electric contact pressure thermometer contacts singeing failure, the best way is to work to improve the contacts, as shown in Fig. 11-60...
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This Time Domain Reflectometer (TDR) based on circuit idea published in Electronics Design October 1, 1998 magazine. Time Domain Reflectometer modified version by Tomi Engdahl which you see in this document. The circuit has been tested with wide variety of....
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This beeper circuit will generate an car-splitting 110dB from 9V. The setup uses a single 74C14 (CD40106B) CMOS hex inverting Schmitt-trigger IC, which must be used with a piezoelectric device with a feedback terminal. The feedback terminal is attached to a....
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Just an early post to share some work on remote controlling the PXA-70x Multimedia controllers. Target For my new install, I have been looking at no....
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Low-cost light dimmer using an SBS and triac. Shunting the SBS with two 20K resistors minimizes the flash-on effect, courtesy Motorola Semiconductor Products Inc. ..
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The ZN459/CP used in this circuit is a high-gain low-noise preamplifier designed for audio/video applications at frequencies up to 15MHz. Figures 2-7B and 2-7C show typical PC board layouts for the ZN459 and ZN459CP (DIP), respectively. Figure 2-7D shows....
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Here is an ultra simple automatic light switch circuit for bedrooms. After construction,connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm Clock. When the clock alarm is activated at a....
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The IC has an FLL (frequency-locked-loop) structure. The filtered output of the FM discriminator frequency-modulates the local oscillator to provide negative-feedback modulation. The result is compression of the signal at the output of the mixer. Thus, the....
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This ambit is of an 2x 2, 500W RMS stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof shows a channel, and the ability accumulation that it assists to the two channels. The audio ambit should be duplicated, but the ability....
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This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have....
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The first application has to be a stereo power amp, since that`s what I built using two prototype modules. The reasons for this choice are twofold ... a good high powered stereo amp is always useful, and it was important to be able to assess the sound....
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Right! Now that I have finally solved the issue on the charging here is prototype 1 of the circuit. It uses 2 voltage dividers to give 2.0v to D- and 2.8v to....
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This rf amplifier ensure the power you need to boost a small transmitter. Depending of input rf power, power supply and transistor, this amplifier can boos....
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A better way to make a stepper motor controller is to make a printed circuit board, and then simply drop the components in. After making the PCB, placing the components and soldering them hardly takes any time at all, in contrast to the proto board which....
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This is a TV Remote Control Jammer circuit. Remote control use modulated light to combat eer infrared nvironment/background infrared noise. Your room heater,....
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For those who dont like microcontroller projects, pretend the micro is a dedicated LED driver IC that just happens to have been designed to control 30 LEDs in the shape of a Heart (what a stroke of luck!). And it wont be declared obsolete just after....
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Arduino sketch and other useful information about driving a brushless DC motor, such as DVD drive spindle motor, using Arduino or another MCU..
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This is a games timer circuit diagram. When the games timer is RESET, two things must happen. The 4017 counter must go back to zero and the 4060 ....
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CS6061A integrated circuit fabrication is the use of touch-step dimming lights, it has two state of the female state switching function, and J as reliable, able to adapt to lon..
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This is a circuit for touch switch circuit. This circuit is almost same with touch door alarm. This circuit uses a 555 timer as the bases of the touch switch circuit. This is the figure of the circuit. The operation of this circuit is begin, when the plate....
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This Project REMOTE CONTROLLED SWITCH BOARD is used to switch on/off the Home Appliances by using a standard Remote control. The system is used to switch on/off upto six electrical devices. All the above processes are controlled by the 8 bit Microcontroller....
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This is an IR remote control for Nikon cameras. It is compatible with the Nikon ML-L3 remote control. Supported cameras include: D40, D40X, D50, D60, D70, D70s, D80, Coolpix 8400 8800. This design is based on an idea from The circuit is extremely simple: an....
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There are chips that have AND/OR/NOT gates, but I was wondering if there`s a single one that have all of the ones I need - if not, then what should I use specifically Any reason it has to be those particular gates For example a package with with four NOR....
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This circuit uses a couple of Op-amps to produce an interesting sound effect. The left hand CA741 is wired as a standard astable and produces the timing pulses, controlled by C1, R2 and VR1. The output is fed via C2 to the second op-amp and is also direct....
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This circuit was requested by several correspondents. Its purpose was to obtain more power than the siren circuit already available on this website (One-IC two-tones Siren) and to avoid the use of ICs. A complementary transistor pair (Q2 & Q3) is wired as a....
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A follow up Mk2 version described by EA`s Jim Rowe in the May/June/July 94
issues of EA improved on the original with calibrated time and vertical
scales, and extra triggering features. This design proved even more popular
than the first, proving that....
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When connected to popular Stax Class 1 electrostatic headphones, the design shown in the figures may be on the full audio bandwidth ..
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You will need 512 properly working LEDs in the lattice. They will need to be stable and bright. This step will show you how to separate the faulty ones from the usable ones. Lots of times there are broken LEDs, especially when they come in large packages.....
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This article continues the AT90S4433 Microcontroller series. I suggest you to read the previous articles on Atmel Microcontroller programming with regards to: This time we design a frequency counter which can measure frequencies from 1Hz to 100MHz.....
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Circuit consists of two parts, (1) the power supply circuit via the transformer T, AC 220V down to 33V, full wave rectifier, filter, three-terminal regulator outputs + 24V and ..
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Here is a simple project using very common electronics components for charging mobile battery using AA cells. The main part of the circuit mobile cellphone charger is timer IC NE555, used to charge and monitor the voltage level. IC1 get control voltage to....
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This is a simple and inexpensive clap operated switch, which uses only four transistors and resistor/capacitor network. The name of the project itself suggests its application. It can be used for level control in hydroculture project. Also for kitchen....
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By the dual sound multi-frequency encoding signal, the circuit modulates the emitted carrier frequency, and it composes a DTMF encoding wireless calling system circuit. The circuit uses DTMF encoding circuit UM97085 and decoding circuit YN9101 to form a....
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In this figure S1 can start timing and when the timer starts, turning this switch has no effect.S2 is the OFF switch in the middle and turning this switch can make the timer complete the procedure: charging-open circuit-discharging. Because of charging....
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As shown in the clock signal generating circuit as RC, which applies to most of the TTL system. This circuit requires only a 6-inverter set of circuit SN7401 three inverters. T..
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Mode control of the average current CMC Require it in order to control the total waveform of electric current of rebuild of cycle. This text recommend, choose concrete the intersection of voltage transformer and required some step for you, and how design one....
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This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser....
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Here is a simple but inexpensive inverter for a small soldering iron (25W, 35W, etc) In the absence of mains supply. It uses eight transistors and a few resistors and capacitors. Transistors Q1 and Q2 (each BC547) form an astable multivibrator that produces....
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Every self-respecting DIYer makes his own electronic dice with LEDs as spots. Then you don`t have to throw the dice anymore just push the button. The electronics also ensures that nobody can try to improve his luck by fiddling with the dice. Too bad for sore....
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This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a digital data signal. A digital data signal can be found on the output pin of TSOP-1730 Infrared Receiver, on the Transmit and reveive pins of MAX-232 chip (RS-232),....
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The circuit is a form of the so-called ""Americanized" version of the Baxandall negative-feedback tone control. At very low frequencies, the reactance of the capacitor is large enough that they might be considered open circuits, and the gain is controlled....
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This GAL programmer is controlled via a parallel port, so that any exclusive interface is not requires for the programmer. It is easy to use on the notebook PCs. When program a PIC, a socket converter is needed. After assembly is finished, check if the....
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This is a project for a versatile, digital signal processor (DSP) based generic driver and controller circuit for Solid State Tesla Coils (SSTCs). Support for all new topologies (DRSSTC, OLTC, PLL-SSTC, . ) can be implemented programmatically. The same....
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This is a circuit of negative resistance circuits. All of the preceding circuits rely on RC time constants to achieve resonance. LC combinations can also be used and offer good frequency stability, high Q and fast starting. In the circuit, signal input is....
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A type of output structure used with integrated circuits in which one transistor drives the output high while another transistor connected below it pulls the output low. Many ICs use Totem-Pole Outputs, in fact it`s so common that the output structure isn`t....
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This circuit breaks an input voltage signal down into its components: (1) the absolute value and (2) the polarity or sign` (+ or ). It will handle direct input voltages as well as alternating voltages up to several kHz. With a supply voltage of ±9 V, the....
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I have a Power Factor Correction board that was taken from an old Sun Microsystem Spark450 power supply p/n 300-1359-xx. It has everything I need for a 650 watt inverter. The entire PFC circuit is not detailed in this image. The only part of the circuit I....
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Turn ON or OFF electrical devices using remote control is not a new idea and you can find so many different devices doing that very well. For realization of this type of device, you must make a receiver, a transmitter and understand their way of....
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User Agrement & Disclaimer Disclaimer All files are found using legitimate search engine techniques. This site does not and will not condone hacking into sites to create the links it list. We will and do assume that all links found on the search engines we....
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The simplest method of detecting metal is by beat frequency oscillator. The circuit basically consists of two balanced oscillator. One acts as the detector element, the other provides the reference signal. This oscillator frequency reference is set to fix....
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Here`s video transmitter circuit is working on the UHF channel frequency 470-580 MHz channel 21-34. This video transmitter can radiate as far as 30-100 meters by using a cable 10-20 cm. If you have a plan to amplify this video transmitter`s signal, please....
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All types of transistors including Darlington and power will be tested in this project. Connect the 9v battery around the other way at points A and B to test....
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A capacitor Cl and resistor Ri-R3 consisting negative sequence voltage filtration device. Resistors and capacitors to meet the following requirements: Ri Ra-Rz 5.5/C1 (KN) form..
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This field strength meter consists of a tuned crystal detector producing a dc output voltage from a transmitted signal. The dc voltage is used to shift the frequency of a transmitter of 100-mW power operating at 1650 kHz. The frequency shift is proportional....
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Electronic circuit shown in Figure crying, which consists of voice recording, audio power amplifier and power supply circuit composed of three parts. Wherein ICl to fool type o..
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This circuit switches its dc/dc converter, IC1, off whenever the large filter capacitor, C6, has suffic..
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This circuit is a modification of High & Low voltage cut-off with delay& alarm circuit appeared in Circuits today, which I have tried and found to be quite reliable. You can adopt this circuit with small modification. Use a transformer with secondary 15 0 15....
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Can alkaline batteries charging problem, there are two different versions. Some say you can charge, the effect is very good. Some say absolutely can not charge the battery desc..
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Anti-theft car audio system circuit is shown, which is taken from the car battery 12V DC power supply. When after closing the switch S1. Optocoupler IC1 light emitting diode is..
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1Hz clock signal generator circuit It shows a sophisticated l llz clock signal generating circuit. Can be used for digital clock and timing circuits: The circuit consists of 14..
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Here is a simple and compact flasher circuit that an be used where ever a flashing LED is needed. The circuit finds application in flashing beacons, alarms automobile and more. The circuit is nothing but an astable multivibrator based on IC NE 555 (IC1). The....
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Starting from a 30 volt power supply this high voltage converter circuit can deliver a voltage between 0 to 3 kV (version 1) or from 0 to 10 kV (version 2)....
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....