Popular Circuits Page 73
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I am trying to create two circuits * 1 transmitter * 1 receiver for ultrasounds. I all ready have a pair of 25 kHz transmitter/receiver....
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The human speech apprehend a small area of frequencies, that is extended from 300HZ until 3KHZ. This spectrum is also internationally recognized for the transmission of speech via telecommunications networks. This is also the mainer use of this circuit, one....
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I have 6 injectors from a Suzuki bike with unknown flow rates. Can I flow them myself to see what I have?....
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Small and portable unit, Can be assembled on veroboard Mobile phone chargers available in the market are quite expensive. The circuit presented here comes....
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Crystal radios have been around for over 100 years and exist in many different shapes, sizes and complexities. Some are definitely better than others, but wired correctly and connected to a good Antenna and Ground wire system, this simple little AM radio....
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16G—2 character lcd display is very basic module which is commonly used in electronics devices and projects. It can display 2 lines of 16 characters. Each character is displayed using 5G—7 or 5G—10 pixel matrix. Interfacing 16G—2 LCD with 8051 using Keil C....
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This is an automatic light dimmer circuit. You do not need to dim the lights by yourself. It is so very convenient, because we use the LDR to detect external light. To control the Triac, and the brightness of the lamp next. Suppose low light so there is....
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The water detection time is less than 10 seconds. Since the microcontroller enters a low consumption state between readings to preserve battery life, this state is always 10 seconds long. If water reaches the probes while being in the low power state it will....
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Circuit shown in Figure 3-159. The circuit uses complement each other three times and three relay contacts, followed by the automatic removal of the rotor circuit resistance le..
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This circuit is FM radio receiver that very small size and works well, although the sensitivity is poor. The principle of this circuit is to use the generator....
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The Spartan-6 board has 16 LEDs Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
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This is an Analogue TV Transmitter. Sound modulation is type FM with a 5.5MHz carrier and video transmission is PAL. Frequency is adjustable via C5 and tunes 54 to 216Mhz with components shown. This is suitable for countries using TV systems B and G....
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One can transform an ordinary binary counter, such as a 7493, into an up/down counter with mode control by adding XOR gates 7486 to the counter`s outputs. The circuit counts up when the DN/UP line is low and down when the DN/UP line is high. To use the 7493....
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Light sensitive switch or dark sensitive switch is a special type of switch using op-amp IC LM74 and LDR circuit diagram with description ...
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Figure A is the schematic of the microstrip single stage RF amplifier. The amplifier is based on the M/A-Com LF2810A MOSFET. The transistor is actually a 10 watt, 28 volt part, but provides adequate gain for this application at 12 VDC. The amplifier provides....
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I recently worked with an Audio Technology custom midrange driver. Since not many of us get a chance to work with drivers like this one I thought I post some pic and plots if case anyone found it interesting....
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If the principle of work of the Kapanadze device is the same principle as discovered by Tesla over a hundreds years ago (oscillator-shuttle-circuit) and it is the same principle as described by Bearden thirty years ago (The Secret of Electrical Free Energy)....
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The automatic fan controller circuit shown in the schematic has 2 comparators with different triggering points that are independently adjustable. LM135 or....
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Current negative feedback voltage divider biased circuit diagram: ..
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Have you ever attempted to copy a commercially produced video only to end up with a distorted and jumpy image? If so, then you have run afoul of MacroVision. MacroVision is the most popular copy protection scheme used on the majority of content distributed....
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This dc to dc converter raise a dc voltage at almost a double value and is useful for raising the output voltage of solar batteries up to the required leve....
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This is an implementation of the L298 to drive motors and inductive loads up to 4A continuously. Initially the L298 contains two separate channels, each one capable of driving 2A loads. Connecting them in parallel as in the schematic makes a single 4A....
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Collecting and storing experimental data is a common challenge for hobbyists. A popular approach is to use a device for converting analog data into digital data and storing the information on a computer. These devices are called A/D converters: an....
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The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal batts (i. e. Duralites). Power source can be a 12v Gell....
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This joystick model was presented by IBM together with their first IBM PC computer. The joystick is just a basic analogue joystick with two buttons. The original joystick interface had circuit for connecting two joysticks, but had only one joystick....
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Undervoltage release is long-term work, when the power supply voltage drop in the operating voltage range when the release is released, and directly led to the tripping axle rotation, cut off the breaker. ..
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A Wien bridge oscillator produces sine waves with very low distortion level. The Wien bridge oscillator produces zero phase shift at only one frequency (f = Vx t RC) which will be the oscillation frequency. Stable oscillation can occur only if the loop gain....
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The TDA2004 is a class B dual audio power amplifier in MULTIWATT [package Designed specifically for car radio applications. TDA2004 has low noise, low distortion, and robust. The robustness is supported by its operation safety protection features: very....
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Simple FM stereo decoder circuit using MC1310P IC. 12V operation, 40dB channel seperation. Suitable for stereo FM receivers....
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The following circuit shows about 555 Timer IC For RF Sweeper. Features: used a 1N4004 Diode, JF1OZL uses a pot for a fine frequency control ....
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Robot Beacon is a rotating light. We have called it Robot Beacon as it has been designed as an addition for a robot, but it can be used for many applications.
It can be used as a mast-head beacon on a boat or as an "all-round" warning light on a bike.....
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As shown for the test circuit with feedback factor of 1/83 DA6101Q/6111Q is. f input signal input through a network of R1, C1, C2, C3, R9 enter TDA6101Q composed of 3 feet, 3 f..
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The circuit is based on the PIC 16F877 microcontroller, see schematic in figure 4. The digital display output of the speech recognition circuit connects directly to the pins of the microcontroller. The LED in, provides a trigger that informs the....
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The Spartan-3E board has four LED Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
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Above ” 2 air variable capacitors and a copper clad board screwed onto a piece of wood for my bench musing. Regenerative receivers delight and amaze ” some builders take them very seriously. I respect this, but to me; they should be as simple as possible. I....
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When the infrared receiver tube PH302 receives a signal from the remote control, the CX20106A selected frequency amplifier output..
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Field strength meter is extremely useful when working with RF devices. It can be used to quickly diagnose whether a transmitter circuit is working, and can be used to detect RF signals in the environment. The simplest field strength meter could be built with....
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This circuit was designed for use in a hifi showroom, where a choice of speakers could be connected to a stereo amplifier for comparative purposes. It cou....
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This be Mini Power Inverter , by use SCR be main part electronics , perform Oscillator Generator 400Hz give Output 300V by use Voltage Input 12V Current....
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This power supply was designed for use with the ˜Simple hybrid amp published elsewhere in this issue. It is of course suitable for use in other applications as well. We ve used a cascade generator for the 170 V, a switch mode supply for the 16 V, a series....
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This system will alert you or anyone chosen by automatically dialing a programmed phone number. This is accomplished by monitoring an open- loop or closed-loop sensor switch located in the protected area. Mien the sensor detects a problem (such as a....
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Automatic door control and the market price of finished executing agency generally high, the proposed method will be suitable for homemade use, the components used are easy to ..
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Digital IC, Electronic Lock , Here is an electronic code lock, which can be used as a door latch or key for ignition, etc. Operation is fairly tricky and there lies the beauty of the ci...
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Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficieny white LED modules using the battery power availab....
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Page 1 of 2 - Frog polarisation - any interest from others in a custom PCB? - posted in Electrics (non-DCC): Greetings I am very slowly building a fairly large layout by myself and despite the allegation that DCC makes for only a two-wire wiring requirement....
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The memory system design: the detailed timing waveforms for a static RAM component, and the design of the register and control logic that surrounds the memory subsystem, making it possible to interface the memory to the rest of the digital system. But first,....
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If you`re an effects builder or repairer, you know by now that it`s a good idea to protect the circuitry in the effect from the consequences of a reversed battery. While many older effects can withstand a momentary reversal, some more modern components can....
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The power supply uses two VN4000A 400-V MOSPOWER FETs in a half-bridge power switch configuration. Outputs available are + 5 Vat 20 A and ±15 V (or ±12 V) at 1 A. Since linear three-terminal regulators are used for the low-current outputs, either ±12 V....
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Over-Temperature Alarm Circuit Uses Common, Inexpensive Components | Negative-temperature-coefficient (NTC) thermistor, ICs...
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This circuit is use to 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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Switching regulators work by drawing small amounts of energy from the input source and transferring it step by step to the output. This task is attained by using an electronic switch (operating at a predetermined frequency) which works like a gate between....
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Most operational amplifier circuits require a dual-polarity power supply - one having +V and -V. However, there are times when a DP supply simply isn't conveniently available. Single-polarity modifications to DP designs often acheive their effect by....
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CI capacitor in series with the crystal may be used to adjust the output frequency of the oscillator. The valu..
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The ADUC836 MicroConverter is a fully integrated 16-bit data acquisition system-on-a-chip. Like all of ADI`s MicroConverter products, it features precision A/D & D/A conversion and a Flash Microcontroller on a single chip. The ADUC836 is 100% backward....
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Circuit works The fluorescent lamp electronic ballast circuit by the rectifier filter circuit, high-frequency oscillation circuit and output circuit. Circuit, the rectifier fil..
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Touch operated switches are an attractive project for DIY electronics but they are not so common in commercial products. The reason for this is that, although there are many different ways of implementing a touch switch (leakage, hum pickup, capacitance,....
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Now that we`ve covered the basics in tutorials 1-10 (you have watched them all right! ), it`s time to start pursuing some more complex projects! In this episode, we`ll utilize an SD card shield from cooking-hacks. com to create a datalogger. First, I`ll walk....
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This is a 6m band transmitter RF power amplifier (50 MHz) with 100W output. It used with my FT-736R and drive from 10W for the 6m SSB DX. The Building information comes from Japan CQ Magazine. The Toshiba RF bipolar power transistor is used in it. If you....
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Bass booster of this website is used to boosts the beat frequency without effect the high frequency circuit diagram of bass booster bass booster and different radio circuit...
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This is a continuation of my previous article regarding class d amp using 555 timer chip. Looking back to several schematics on that article, some of you may wonder why I include another 555 as U2 in the drawing. The main purpose of this U2 is to establish....
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I hope that this crystal set is well received by all of you. My #62 radio combines the features of some of my earlier radios. It combines the one piece approach of my #48 set and the dual detector of one of my recent sets. The coil arrangement is a dual....
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Dark Detector with LM555 . This is a dark detector circuit. This circuit will generate sound if no light source and silence when light falling on CdS. CdS : Cadmium sulphide or cadmium...
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Using the 555 timer as an oscillator in the high voltage power supply section. Can the design be changed to use an output from the micro-controller to generate an oscillating signal instead of the 555. The first question is that would such a design work If....
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Simple circuit No ICs required, 12V Battery operation This circuit was requested by several correspondents. Its purpose was to obtain more power than th....
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the AD844 was still used, but this time the feedback loop went all the way from output and back to input. The DC servo was removed and the current source was made faster, using an extra transistor. The local feedback was turned into global feedback, lowering....
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Contact bounce is a critical issue when interfacing switches or relays to a digital control system. The ultimate contact debouncer is an easy-to-use and flexible approach to solve the contact bounce problem for any microcontroller....
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Here is the schematic diagram for the original arcade version of Pong, the first digital video game. Unlike other video games of the time, Pong used an all digital circuit to produce the graphics, sound and game control. There is no software or processor,....
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This little project came about as a result of a design job for a client. One of the items needed was a mic preamp, and the project didn`t warrant a design such as the P66 preamp, since it is intended for basic PA only. Since mic preamps are needed by people....
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Once again my collection of projects creation has been interrupted by another necessity. Patrick and other people have asked me for a circuit of a VHF power amplifier. These circuits are my "standard" building blocks that can be used to amplify RF power....
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As shown in FIG constituted by L4960 + 5 ~ + 40V switching power supply circuit. AC 220V voltage through the step-down transformer, bridge rectifier and filter DC voltage Vi, i..
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The interface depicted below can be used build a serial cable to connect the serial port of the computer to the 16-pin OBD-II connecter found in many cars build in 1996 or later. This interface only supports the ISO 9141-2 / ISO 14230-2 K-line tranfer mode.....
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The construction of this quite complicated circuit will be awarded with the joy of generating almost unlimited sound effects. The circuit can produce different sounds like the heavy chopping of a helicopter s blades up to the fine chirping of a bird. A....
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This generator uses avalanche noise, and is based on a design by Will Ware. Herein are instructions as to how you can use a pic chip to analyze a noise source and output random data serially. I`ve included circuit diagrams as well as links to instructions....
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Exhaust fan is an important component in kitchens. Here is a simple circuit to control kitchen fans by monitoring the ambient temperature. It is built arou....
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Adjustable capacitor C10, and coil L1 form a tank circuit that, in combination with Q1, C2, and R1, oscillates at a frequency on the FM band. The center frequency is set by adjusting C10. An electret microphone, M1, picks up an audio signal that is....
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This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it....
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After the SCR turns on, CI charges up to almost the full supply voltage via R3 and the anode of the SCR. Whe..
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PIC development/testing board Here`s a PCB design for a bare bones PIC16F877 development board. All you need is a 4mhz crystal, two 22pf caps, one 4.7k res....
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This TDA2030 200 watt amp low cost audio power amplifier can deliver high output audio power up to 200 watts on a 2 4 ohms load impedance. This 200 watt amp high power audio amplifier is build around the TDA2030 audio amplifier IC which normally can deliver....
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There have been a lot of transistor tester circuits in recent electronics magazines, but this one is different. It has more features and includes a signal injector so you can test audio sections of radios and the front end of FM transmitters etc. The major....
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A single chip metal detecor with a range of a few inches. This is useful for detecting nails or screws in walls and floors, or for locating buried mains cable. The heart of the metal detector circuit is a single IC the CS209A made by Cherry Semiconductor.....
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Here is the circuit diagram of a simple radio that uses one transistor and few other passive components. The C6 and L1 forms a tank circuit which picks up the signal from your desired radio station. Diode D1, capacitor C2 and resistor R1 does the detection....
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Attached the circuit schematics 12 Volts : from car battery Ground : Car chassis Signal : from the sensor stepper motor The No 5 Pin of LM3914 c....
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Telephone electronic ringer circuit is shown as above,Figure (a) is the electronic ring circuit with an NPN transistor V1 (choose 9014 or 3DG12) as the core, sound devices YD is also feedback devices composed of the feedback pole and the buzzer equipped with....
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so what happens when you flip a switch? When you try to stop the flow of current in 'zero' time its equivalent to trying to stop a freight train instantaneously. you get a huge voltage buildup "dv/dt" = "X/0=infinity This is one example of the use of a....
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This electronic circuit uses a 555 timer as the bases of the touch switch. You can learn more about 555 timers in the Learning section on my site. When the plate is touched the 555 timer is triggered and the output on pin 3 goes high turning on the LED and....