Popular Circuits Page 223
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This text-to-speech converter is built around the SP0256-AL2 speech processor and the Cf6256AL2 text-to-speech converter chips~manufactured by General Instruments. The circuit is set up to receive standard ASCII code from virtually any microcomputer or....
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Many of you will have an old mobile phone gathering dust. The circuit shown in this article gives the old mobile a new lease of life, enabling it to switch an electrical appliance on and off in or around the home. The circuit will even talk to you on in....
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A Variable DC Power Supply is one of the most useful tools on the electronics hobbyist`s workbench. This circuit is not an absolute novelty, but it is simple, reliable, "rugged" and short-proof, featuring variable voltage up to 24V and variable current....
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It`s a relatively straightforward design, and will probably not be the best way of doing this. However, it works fairly well, and is relatively inexpensive to build. Six independent microphone amplifiers with up to 60dB gain (theoretical, not tested). Each....
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Building VFOs in 2011 might seem an irrelevant exercise given the move to and evolution of digital signal generators laden with bells and whistles like memories and audio or video frequency displays. A successful L-C VFO requires skill, patience and some....
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The LEDs are OSSV53E1A from OptoSupply and they have an 140° angle. This means that the first plane with uniform density can be obtained at a shorter distance from the LED, for a given spacing between LEDs which means smaller height for the board. Their peak....
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The 24 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and....
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If sine wave is very essential it can be derived from the square wave. One of the most popular IC used to generate clock from Maxim Integrated Products is MAX9471. Please refer this circuit below to design a clock generator out of this device. This device....
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This multi-tone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio....
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i have a tandberg 74b that i just received second hand - everything on the inside is original, excluding previously replaced tubes. when it first....
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Here s how to build a pendulum-controlled clock which can be made really accurate. Retro? yes, but an interesting project all the same. You ll need a sp....
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Each step will result in a self functional unit. In the end of this journey, you will be able to link the steps together into a very powerful FM transmitter. This part will explain the main controlling unit for the FM transmitter. This part is very important....
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This 8V DC power supply was designed for use with an expensive piece of electronic equipment. It features full over-voltage protection as a precaution against regulator failure, either in the supply itself or inside the equipment it is powering. The circuit....
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There are two main types: the most common is the Wein Bridge oscillator variety, which has low distortion, but offers only sinewave output and can suffer from amplitude bounce as you change frequency. The type which offers greater versatility of waveform and....
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Evolution FM transmitter with 2n2218 with audio amplification step using LM741 op amp with audio input for MP3, MP4, mobile, computer and other audio sources, beyond the traditional electret microphone. With great sensitivity to the input signal. Using fewer....
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The SLA7062/67 chip is a unipolar driver and can provide up to 3amps. The chip is hard to find and will cost about $10. each. Using Google, I found the three that I needed for my prototypes. Newark (Farnell) sells them but has no stock. The pcb`s can be....
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Simple low voltage/current power supply that can accept wide range of input voltages, up to the hundreds. Let`s say, the input is 20 to 160V DC and output has to be 10V with 20ma maximum current. Since it has to be simple, I decided that it should be some....
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Square-wave generator with LC circuit can get a better frequency stability, it`s as shown in the chart. This three-terminal oscillator of capacitor can be used to generate a square wave, but an operational amplifier is used as the active component....
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One of the most interesting shield that you can mount on the Arduino platform is certainly the ethernet shield, because enable numerous networking applications such as remote control of systems and users, web access and publication of data, and more yet, the....
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As shown in FIG grounds MAX4100/4101 using a capacitive load drive circuit isolation resistor Rs constituted. MAX4100/4101 allows the maximum capacitive load, respectively 5pF ..
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The circuit below illustrates how to build your own daq_lite - also shown is a photo of a completed PCB board. Note that the 80mA fuse shown in the photo and the protection diode close to it are recommended but not necessary. Once you`ve built the circuit....
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This project has two advantages over previous dice circuits. It produces a realistic readout as well as a `slow-down` feature.
These combine to make it one of our most popular games projects.
As can been seen in the photo, the 7 LEDs are positioned on the....
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Yes, it does charge the inductor again. Diodes are a good that they will not charge the inductor back but of course dissipate fair amount of instantaneous power due to the forward voltage drop. One way would be to monitor the current and stop driving those....
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When the input signal is logic 1, the display shows `H` and the loudspeaker emits a note which is an octave higher than the `low` tone. Operation of the circuit can be seen from the circuit diagram in figure 1 and the truth table in figure 2. When the input....
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need often arises for a sensitive sound pick-up device, whether it is to be used as a simple microphone or a more exotic device as a sound operated alarm, a bugging device or a sound operated flash (for stop action photography) the list is quite unending.....
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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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Easy to build, this high voltage generator is capable of generating up to 50KV but the breakdown voltage of the coil limits the voltage to a value somewhat lower. T2 is the ignition coil of a car and also the 0.5µF capacitor comes from the same place:....
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The circuit described here uses an IRF840 MOSFET which is rated at a maximum DSV value of 500V. The avalanche voltage is calculated as 36501. max DSA VV V. This means that up to about 600V of inductive kickback voltage may develop in the switched coil.....
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It`s a classic designing of final amplifier 35 W, with two EL34 in push-pull, from the Siemens and Halske, with year of designing 24/3/1953 and code SV410/1. The amplifier it worked from 1954 until 1989, whenever it came also out except operation, with mean....
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For convenient reading, the display of this tachometer circuit show inthe reading in hertz directly.? The conversion time will be equal to the gating time,...
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LM1801 Water Level Sensor Circuit Diagram. Features: reference voltage is overshot and the IC drives the ceramic transducer to beep, low power ....
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In this project, we will build a relay driver for both DC and AC relays. Since DC and AC voltages operate differently, to build relay drivers for them requires slightly different setup. We will also go over a generic relay driver which can operate from....
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285 is indiscriminately using a battery-powered fluorescent lamp circuit, towns during a power outage use it as a temporary emergency according to the invention. Transistor V 7..
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I got this from a dosing pump control circuit. we use cool IC is no. lm317 circuit, It can uses with power supply source 24VDC and adjust voltage output 1.25V....
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The regen is basically an oscillator circuit with a gain control that allows the user to adjust the feedback to a point just below oscillation or, quite often, just above the critical level such that a small oscillation is present. The typical regen uses a....
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These two simple circuits provide zero voltage switching. They can be used with full wave bridges or in antiparallel to provide full wave control and are normally used to trigger power thyristors. If an input signal is present during the time the ac voltage....
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Those wanting private listening to their music program should add this Headphone Amplifier to the Modular Preamplifier chain. The circuit was kept as simple as possible compatibly with a High Quality performance. This goal was achieved by using two NE5532....
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Here is the circuit diagram of a guitar preamplifier that would accept any standard guitar pickup. It is also versatile in that it has two signal outputs. A typical example of using a pick-up attached to a guitar headstock is shown in Fig. 1. The pickup....
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Okay, I ve decided that I want Daytime Driving lights for my Elise. Also I don t want to keep pressing the button on and off each time I....
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Adjustable DC power supply circuit Shows an adjustable DC power supply circuit, which is composed of step-down transformer T, rectifier bridge pile (VD1 ~ VD4) and other parts ..
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The so-called charge amplifier means for amplifying the signal charge from the piezoelectric device amplifying circuit . Such high internal impedance ..
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Planning on basing a QRP transmitter off of this instructables project, seeing as I have a veritable plethora of 555 ics in my shack toolbox. The problem is, this transmitter is designed to operate a bit below the commerical AM band. How is the general....
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The frequency measurement is one of the most important things in radio construction. Without it you will be unable to set desired frequency in your receiver (and in transmitter too!), without it you will be unable to monitor frequency drifts etc. Sometimes,....
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This be Water Sensor Alarm Circuit for warn the water level , by when sensor point touch the water or the rain. The circuit have a voice loud warn hear....
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The FM modulator circuit (frequency modulation) is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209 are used to frequency modulate the oscillator. The 5000 © potentiometer is used to bias the varactors for the best linearity. The....
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Many areas of scientific research and industrial production require vacuum conditions - where most (or as much as possible) of the air has been removed leaving little or nothing behind. While written specifically for the needs of home-built gas lasers, much....
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The method goes by the switching method. Making it be possible to see four kinds of the input signals at the same time by switching them at the short period. In addition to the way of introducing here, there is a method which changes the input every period.....
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The circuit presented this month is a basic configuration of the very versatile 4017 IC Chip. In the most common use of the IC, it will turn on 10 separate outputs sequentially. Typically, the circuit is used to turn on a LED for certain time cycle. In the....
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This article describes a 2-Digit Counter using a Microchip PIC12F629.
It shows what can be done with an 8-pin chip having just 5 output lines and one input line.
The chip drives two7-segment displays and this would normally require 7 lines to drive the....
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An N-channel MOSFET and P-channel points, with two complementary symmetry circuit composed of CMOS complementary output short circuit, as shown in the schematic for it. When th..
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Picured in Figure 1 is a miniature magnetic gun. When optimally tuned, it will propel a small slug about 1.5 metres high, or 2.5 metres horizontally.
IC1 is a 555 timer in astable mode, sending approx. 10 ms pulses to decade counter IC2. IC2 is....
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Ultrasonic sensor circuit is a sensor that consists of transmitter and receiver. This circuit is useful for remote control. The frequency of sound produced by a series of Ultrasonic Sensor is above 20 KHz which is between 40 KHz 50 KHz. Used power supply....
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Here is the schematic of a simple DIY solar cell phone or USB charger circuit. This solar USB battery charger circuit can be used to charge any device, which can be charge from computer USB port. For example MP3 players, cell phone, iphone etc. The circuit....
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The block diagram explaining the device and operation of the sonic depth finder, is shown on fig. 1. The clock G1 generator operates interaction of knots of the device and provides its work in an automatic mode. Generated by it short (0, 1 c) rectangular....
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15 Watt switching power supply schematic diagram. Pulse transformer T1 is performed on the ferrite core M2500NMS-2 or M2000NM9 Sh5h5 size (cross-section of the magnetic coils at the location of 5G—5 mm with a gap in the center). Winding wire is made brand....
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The doorbell sound circuit was two-tone sound. With the switch S1. working of the circuit, IC1 is a frequency division circuit, and a sound frequency generator came out. by C1, R1 is the frequency generator. This audio signal from pin 7 and pin 4 to pin 1....
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This inverter circuit can provide up to 800mA of 12V power from a 6V supply. For example, you could run 12V car accessories in a 6V (British?) car. The circuit is simple, about 75% efficient and quite useful. By changing just a few components, you can also....
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i have this project which requires us to make a digital speedometer and odometer and used AT89S52. I have tried it on Proteus (ISIS) simulator and is actually working ..
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The aim of this circuit is to keep the permanent magnet dc motor running at a constant speed, set externally. To do this, the current through, and the voltage across, the brushes of the motor are monitored..
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If you go to most supermarkets today you will see plug in mains powered digital programmable timers. These are designed to be used to automatically turn lights on and off, to turn washing machines on when you are out and so on. Prices start from as little as....
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Designing a simple current limiter, which charges a large (4. 7mF) capacitor with a charge current of (roughly) 500mA from a supply voltage from about 10-20V - see the below circuit. My dilemma is that I already have a bunch of MMBT2222A and it would be nice....
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Much of the focus around residential gateways designs has focused on distributing communication connectivity within a home or residence. But, in order to distribute content, gateways must first have an effective WAN interface that provides access to cable....
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This design was developed by request of a correspondent having made a sort of LED candle and needing to switch off the LED with a puff.
This simple, easy to build gadget can be useful as a prop for Halloween and Christmas season, shows and the like...
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This page will be updated as Material becomes available. This New System will essentially replace the original BCD Design originally designed by WB6IGP and N6IZW and appeared in ARRL UHF/Microwave Project Manual. Their efforts were later revised by WA6CGR.....
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THE GAS SENSOR is mainly composed of tin dioxide on a ceramic base; the resistance of the sensor varies depending on the concentration of reducing gases in the air. The circuit shown is useful for the detection of dangerous levels of combustible fumes or....
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The loads (2 or more solenoids in parallel) share a 12V supply and are individually switched to ground through the car`s ECU. I need to detect when any one of the circuits close (only one closes at any one time), using a single PIC digital in (or comparator....
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The RF signal is passed from the antenna through CI to the tuned circuit made up of LI and C2. One end of L2 feeds th..
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This article describes how to implement a simple, but robust, optical wheel encoder system on a robot that uses hobby servos for two-wheel differential drive. In my case I am using the TJ-PROTM robot platform from MekatronixTM, and some aspects of this....
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On my mountain bike I always used to have one of those well-known flashing LED lights from the high street shop. These often gave me trouble with flat batteries and lights that fell off. As an electronics student I thought: this can be done better . First I....
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To make a battery operated LED lamp, it may better to use a cluster of low power discrete LED array rather than a single high power LED. The light produced will be scattered and It considerably reduces irritation or damages to a naked eye, if accidentally....
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Designed around an LM3900 quad op amp, this mixer combines 2-line and 2-mike inputs and sums them at the output terminal. R7 through R10 can be changed to vary the gain (around +23 dB). ..
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This circuit furnishes an initial voltage of 2.5 V per cell at 25° C to rapidly charge a battery. The charging current decreases as the battery charges, and when the current drops to 180 mA, the charging circuit reduces the output voltage to 2.35 V per....
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This circuit is designed in response to a request made by Mr Vignesh. What he requested was a circuit for recording and playing voice. I think this circuit is enough for the purpose. This circuit is based on the IC ISD1020A from ISD. The ISD1020A is a CMOS....
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Make a very cheap, relatively easy to construct robot which will wake up any time you shine a desk lamp on it. There are no sensors on it, although I....
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This converter enables a receiver that tunes 28 to 32 MHz to receive the 144- to 148-MHz amateur band. A BF981 dual-gate ..
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cable LAN tester circuit can also to test cable on telephone, coaxial cable, Lan cable and other. this circuit using led for main indicator device..
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This is a design circuit for the FSK demodulator, that is the electronics device that converts the FSK signal to serial digital signal. To transmit digital serial data we use FSK modulation and to get back the digital data at the receiver, we need to....
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Originally, the tank cost around Php400 but then it was sold at around a hundred less. Without thinking twice I know I had a great offer so I decided to buy the toy. Opening the toy was quite a bit tricky. The track belt needs to be removed first and the....
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The EEprom programmer software supports the following devices 28C16 28C256 28C17 29C256 28C64. Diode D1 and resistor R1 provide the VDD isolation when programming the 24 pin devices. The jumper J3 must be shorted for 24 pin devices, and open circuit for 28....
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Difficult to observe in order to solve the leaning phase in adjusting the electric transmission line manually, record and difficult and normalizing three major difficult problems this difficultly. This design passes the design of the software and hardware,....
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For a project such as a robot or car, we need an ELECTRONIC circuit - one that is controlled by a "CONTROL CIRCUIT". The Control Circuit outputs a signal (or a number of signals) to control an H-Bridge. Here is a circuit of a Hex Bug. The Control Circuit....
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This FM transmitter has a number of features, with a volume control to adjust the input level and a small, neat box to make it easier to attach to a guitar. The volume control is positioned at the end and when turned up fully, the transmitter provides fuzz....
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Its a high quality FM receiver circuit based on IC CXA1019. CXA1019 is a monolithic silicon bipolar radio FM / AM receiver IC for Sony. Built in circuitry within the CXA1019 includes RF amplifier, mixer, oscillator, amplifier, quadrature detection circuit,....
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Circuit The following schematic shows the design of a Parallel Port Interface Circuit Diagram using 74HCT373. The 74HC/HCT373 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). This parallel port interface circuit....
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Feeling chirpy? Attract new friends with this modified hartley oscillator. You could also use it as a replacement doorbell....
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Keyboard is a basic and essential element of an embedded or microcontroller system. For small and hobby projects a 4x4 (hex) matrix keyboard is sufficient. The keys in the matrix keyboard are arranged in a matrix arrangement in order to utilize the port pins....