Popular Circuits Page 181
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This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz - 5000KHz. The loop is of a size....
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A FET impedance converter for use with the Fishman pickup on my Kay orchestra bass. As shown in the schematic below, the circuit is divided into two sections, so that the input section can be mounted inside the head shell of a 1/4" plug. This puts the active....
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This circuit is presented as an alternative to the IR beam break detector featured in the June 2009 issue (Silicon Chip). In order to make it relatively insensitive to ambient light, it uses a standard IR receiver IC such as the Jaycar ZD-1942. This has a....
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Circuit Description: The maximum gain circuit 741 to 20000, but the design of the circuit while filling a gain of 2.7 million, and then causes the output distortion. This disto..
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build an interface board to connect some scientific equipment (for me, a pair of photovoltaic tubes) to a personal computer to acquire measurements results. Signal properties were following: two channels with a common ground, 1 second of acquisition time,....
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This is a schematic of a IR transmitter circuit using IC. The IC used in this circuit is a famous timer IC NE555 which is working as an astable multivibrator in this circuit and producing a 38KHz frequency signal. The circuit starts to produce the signal....
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The V.U. meter that works with the integrated amplifier circuit.The signal will sound, the audio amplifier circuit into VU meter circuit.And will show the level....
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This is a chronological account of a project I am working on: to design and build my own digital clock. I was inspired by the KABtronics Transisitor Clock. That one is made completely from discrete components, but I wanted to do something less ambitious. I....
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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Today, most telephone equipment use a DTMF receiver IC. One common DTMF receiver IC is the Motorola MT8870 that is widely used in electronic communications circuits. The MT8870 is an 18-pin IC. It is used in telephones and a variety of other applications.....
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In the example above a low voltage (12Vdc) is used to turn on a relay to switch on a 240V ac main circuit. Please note that there is no electrical connection inside the relay between the two circuits, the link is only magnetic and mechanical. If there is....
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This simple Mock Flasher LED simulates the indicator of a sophisticated Alarm system. It can be placed in doors, gates and vehicles to confuse intruders. T....
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Small inductance changes on the order of 0. 01% can easily be sensed over a wide range with a simple circuit connected to a serial port ( see the figure ). Using a classic Colpitts oscillator interfaced to an eight-pin Atmel ATtiny12-8 microprocessor, the....
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The CAMD CM8888 8888-2 is a fully integrated DTMF Transceiver, featuring adjustable guard time, Automatic Tone burst mode, call progress mode, and a fully compatible 8051 8086/8 Microprocessor Interface The CM8888 8888-2 is manufactured using....
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This circuit was purposely designed as a funny Halloween gadget. It should be placed to the rear of a badge or pin bearing a typical Halloween character image, e. g. a pumpkin, skull, black cat, witch, ghost etc. Two LEDs are fixed in place of the eyes of....
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This is an AM demodulator which is not affected by phase errors in the demodulated signal. Phase error is a type of error commonly found in simple diode/low pass filter demodulators. At the input stage is an AC amplifier which is adjustable through P1. A1....
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With simplicity being the goal, brain-wave goggles can be constructed from suitable eyewear, such as safety glasses, and an array of LED`s (Light Emitting Diodes). I`m using the PC`s parallel port to control the flashrate of the LED`s. Audio stimulation can....
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As shown for the simple adjustment of the high input impedance double wave linear detector circuit. The operational amplifier circuit by the negative feedback loop to compensat..
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This circuit substitutes two white Luxeon 1W Star LEDs for the inverter and fluorescent tube in a standard battery-backed illuminated exit sign, as used in commercial premises. While the Luxeons have less light output than a standard small fluorescent tube,....
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In the production of LCD projector, the main factors of the threatening life of LCD screen is the temperature of halogen. The multi-function controller made by this circuit is very effective for the protection of liquid crystal projector. The LCD projector....
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Its basic function is frequency and cycle of the measuring signal, the application of the frequency counter is in a very large range, it is not merely applied to general simple instrument measurement, and apply to other fields such as teaching, scientific....
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A power supply project without using a power supply. This can save the expense of buying a transformer, but presents potentially lethal voltages at the output terminals. Under no circumstances should a beginner attempt to build such a project. Electric Shock....
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The circuit uses approximately 150 µA of current, allowing the circuit to steal its power from the bus via the Schottky diode, D1. Because the circuit is sensing water that is part of the electrical circuit, you should use an ac-coupled signal to avoid....
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This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding..
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Developers of human-computer interface technologies have recently been focusing on the use of bio-electrical signals (eye movement, electrical activity of muscles and brain) as inputs to control devices in order to increase the capacity of signal processing....
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This is a single channel (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz. (This is a very common remote handset frequency). Any "button" of any remote control may be used to work this universal switch. The button....
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An Intergrated ircuit is just that. an intergrated circuit. These small packages combine many individual components to perform a specific function. They vary in shape and size depending on their complexity. They are categorised into functions like Audio,....
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This is a simplest circuit for 100 watt inverter for generating 220vAC from 12vDC. I say simplest because here in this inverter circuit a minimum number of components are used to design the schematic, which is quite difficult to make a circuit like this with....
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An interesting circuit of a true-portable and cute solid-state bright light built with LT1932. The light can be operated from two AA size dry/rechargeable pen-light cells. There is no housing included so that you can use your own imagination as to what you....
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As shown circuit 555 is at the core of the flash circuit, when their normal work, the light emitting diode and VD2 will VDl alternating flashing circuit principle summarized as..
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The figure below shows a schematic diagram of a simple FM receiver. This receiver made with four transistors. The signal from the antenna through the trimmer capacitor C1 goes to the input of the first stage. This stage is a super-regenerative detector based....
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A high brightness LED evaluation board has been developed using the Fairchild Semiconductor FAN7554D PWM controller..
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A very simple and high quality TV transmitter circuit based on IC MC374 is shown in this article. MC1374 is an integrated TV modulator circuit that can be used in various TV transmitter applications. The MC1374 includes all necessary circuitries required for....
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This is a linear FM detector circuit. This circuit usually is used in telemetry applications and wide range of analog communications. The main part of this....
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The Thermistor, or NTC (Negative Temperature Coefficient) of 10K, is a standard type. Most types will work. The one in the diagram is a 10K model made by Fenwal (#197-103LAG-A01). The resistance lowers as the surrounding temperature increases which affects....
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22Watt x 2 audio amplifier circuit diagram. This circuit uses IC TDA 1558 from Philips. TDA1558 is a monolithic integrated class-B Output power amplifier in 17-lead single-in-line (SIL) plastic package. The amplifier based on the class H from Philips audio....
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It is very convenient to light a lamp in our absense in the eving when it gets dark. This automatic night lamp circuit can be used to light staircase light, porch light etc automatically using domestic powersupply. It is very in expensive in construction and....
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This circuit have a function for digital cameras. It`s known the digital cameras have considerable power consumption. For example my camera ....
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If you ever thought of experimenting with pulse-width modulation, this circuit should get you started nicely. We`ve kept simplicity in mind and used a dual 555 timer, making the circuit a piece of cake. We have even designed a small PCB for this, so building....
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It uses body heat to locate and track its human master. At heart of this heat seeking capability is the Devantech TPA81 Thermal Sensor Array. The TPA81 consists of an array of eight detectors mounted horizontally. Each of the detectors is capable of....
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BISS0001 is a sensor signal processing with higher performance integrated circuits, which together with the pyroelectric infrared sensors and a small amount of external components constitute passive pyroelectric infrared switch. It can automatically..
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This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductor`s application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a....
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Amplifer with IC number TDA7293 for process sound system. This amplifer was have the input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition....
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Triac temperature-sensitive heater control. This circuit can be modified as shown to control a motor with a constant load. As shown the circuit is for heating applications but can be used for cooling by interchanging RT and R2 (courtesy Motorola....
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RS-232C serial port lines are quite prone to be damaged by overvoltages. The damaged to computer serial ports have become more and more expensive to replace because of higher intergaration: usually you have to buy new motherboard if one serial port in it....
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The meter will indicate the frequency from a power generator. Incoming sine waves are converted to square waves by the 100K resistor and the 6,8 V zener. The square wave is differentiated by the capacitor and the current is averaged by the diodes. The....
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Commercial FM demodulation is done at the IF frequency of 10. 7MHz. With a frequency deviation of ±75kHz, the deviation of the IF carrier is ±0. 7%. With this deviation, it is possible to convert the FM to AM or PM and AM using passive RLC circuits. The....
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Normally, digital speedometers are found only in luxury cars and high-end motorbikes. Even if your motorbike has a mechanical speedometer, what will you do when it gets damaged? First, It is a digital Speedometer which shows the speed and Kilometers in....
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As shown in figure, D187 is an UART, it`sRX / TX signalconnectedonoptocoupler N21, N22 and N29, so that put the RS-485communication interface receiver / transmitter D28and microprocessor D211 completely optoelectronicisolated. D197 is a generator, the....
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An Inverter is a device that converts 12 volts d.c to 120 volts a.c. , which is what we use in our homes. This project will handle about 300 watts, which is perfect for lights, small T.V.`s and radio equipment.
This Inverter takes 12 volt d.c and steps....
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This circuit uses an oscillator (2N2222) and a diode Dl as a nonlinear mixer. The frequency is set by a slug in Ll. RFCl, Cl, and RFC2 form a low-pass filter to pass video and block rffrom the video source..
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The automatic door handle alarm circuit gives a audible alarm and glows a LED when somebody touches the handle of the door. The circuit is latching type and continues to produce sound until it is switched off. The transistor Q1 is wired as an astable....
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The purpose of this page and its sub pages about members of Z80 family (and close relatives) is to collect and share information and good ideas. I know there are lots of people out there, who have developed some good utilities and hardware solutions. Now we....
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This circuit`s frequency of oscillation increases directly with light intensity. The greater the light intensity, the higher the frequency of the oscillator. The 555 timer operates in the astable oscillator mode where frequency and duty cycle are controlled....
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This is a replacement power source for 1.3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer...
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This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing. In addition if the probe input is neither hi or low (the high impedance state of tri-output logic ic`s) then no LED`s will light. Power from the logic probe is....
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It`s based on a Philips class-H audio amplifier IC and can deliver 36W RMS OR 70W music power, all from a 13.8V supply. Our new Mighty Midget Amplifier can really pack a punch - around 36W RMS continuous into a 4-ohm load when using a 13.8V supply. However,....
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The following circuit shows about 9V Power Supply For Garage Shed Alarm Circuit Diagram. Features:single-zone burglar alarm circuit, used with the ....
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This current-limiting circuit, shown in this example as part of a small bench power supply, could in principle be used in conjunction with any dual-rail current source. The part of the circuit to the left of the diagram limits the current at the input to the....
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Light emitted by Xenon flash tube is transmitted to phototransistor MRD300 through optical fiber. Sensitive current is amplified to triggering a string of thyristors simultaneously. Therefore, high voltage of 6000V is set on loader R. This optical trigger....
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Fig application circuit is a three-phase full-wave six-step driving an open loop motor controller circuit connection diagram. Wherein the power switching transistor Darlington ..
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The following circuit works as a toggle switch. The circuit has two stable states, ON and OFF. Once it is ON, it remains ON till you press the switch again. The project has been derived from buildcircuit. com. In all MINIBREAD projects, we have used the....
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This wireless headphones transmitter assures a quality reception over 2 meters. The oscillator frequency is between 1750KHz and 3500KHz and for antenna we....
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The JarLight is a small flashlight based on a white light emitting diode (LED). It is powered by a single battery cell. This combination enables a very compact case at a very high light power and long-life. Not only of the battery but also of the LED. To....
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This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself. This LC Meter allows to measure incredibly small inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to....
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About a year ago I threw a magnetic swipe card reader into a larger Digikey order. I didn`t have any specific plans for it at the time; mostly I was just curious to learn about swipe cards and what kind of hidden information I was carrying around in my....
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The electronic circuit described below can switch the clock signal of a Z80 CPU between 2 different sources. This can be used to make a turbo circuit in a Z80-based system. It was originally designed for use in MSX computers, but is probably suited for use....
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Designed for communications use, this equalizer circuit uses a Mitsubishi M5226P audio equalizer IC to adjust frequency response. It runs from a 9 to 20 V supply. C6 through C16 are polyester film capacitors of +- 5% tolerance. (QST, ..
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This circuit uses a low-cost feedback scheme in which the dc voltage developed from the primary-side control winding is sensed by the UC1842 error amplifier. Load regulation is therefore dependent on the jcoupling between secondary and control windings, and....
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The LT®1316, a
micropower step-up DC/DC converter with peak switch
current control, meets these needs. The device draws 33mA
quiescent current and contains a 0.6W, 30V switch that can
be programmed for a maximum peak current between
30mA and 600mA with....
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The ac line power is brought back into the circuit through Fl, a protective 5-A fuse. One side of the ac line is connected to one side of each ac outlet. The other side of the ac line is connected to each SGR or silicon-controlled rectifier. Each SCR is, in....
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A phase-locked-loop (PLL) is a servo system, or, in other words, a feedback loop that operates with frequencies and phases. PLL`s are well known to be quite useful (powerful, in fact) in communications systems, where they can pluck tiny signals out of large....
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The programmable power supply is the association of one of the integrated test system of guided missile, are used for offering and testing various required direct-flow stabilized voltage supply of guided missile, in addition have functions such as....
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Here is a simple circuit that can be used as a tachometer. The circuit is basically a frequency to current converter which converts the incoming signal into a proportional current to drive the meter. The deflection on the ammeter will be proportional to the....
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I have created an H-bridge PC with 4x floating gate drivers and 4x IGBTs (see attached schematic showing half of h-bridge). It works very nicely but I ....
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Emphasis on the high bands (902 thru 10 GHz) had been a priority here at ARS KMGT for the last few years. The low bands were in pretty good shape, so not much other than standard maintenance was needed there. However, improvements to the microwave station....
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In the absence of any other force, a mass m experiences a force mg due to Earth’s gravitational field. Since matter is composed of atoms or molecules, it is possible to generate a polarizing electrostatic force between + and – matter. Let’s refer to these....
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This device is a 2 line Audio EMI Filter array designed for speaker applications. It offers greater than 35 dB attenuation at frequencies from 800 MHz to 3. 0 GHz. This device also offers ESD protectionclamping transients from static discharges and ESD....
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Circuit using an ordinary digital quartz electronic watch, the lower its crystal welding, as shown by the connected circuit constitutes a digital frequency meter. The test sign..
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spring reverb It sounds really clean and natural almost too good to be a spring reverb. But when you whack the reverb springs - *POW* - you get dub explosions....
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Chipmunk BASIC has lots off useful functions. So I wrote a small BASIC file to read the serial port and then plot the value on screen (Avaliable upon request FREE). The desktop 386SX PC has a 1. 44 FD and a 40M HD, a VGA with 256k of VRAM. BIOS was configure....
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For many application there's no substitute for sheer power- low efficiency speakers, outdoor sound systems, or maybe you like the full flavour of the dynamic range of a high power amp. Whatever your requirement-this super power module should fit the bill.....
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A very simple metal detector electronic project can be designed using a simple 555 timer integrated circuit . As you can see in the schematic circuit , this electronic project requires few external electronic parts .
This circuit detects metal and also....
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The thermometer meter slinger circuit is composed of power supply circuit and meter slinger timing control circuit, it is shown in the figure 9-135. The power supply circuit is made of fuse FU, power supply button S(Sa, Sb), resistors R1, R2, capacitors C1,....
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This circuit determines whether more than one input in a group of digital inputs is active. It provides a digital measure of the number of active inputs, and it allows you to establish a threshold for majority-decision applications. That is, whether the....
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Circuit shown in Figure 3-137. This eliminates the need for a step-down transformer line, using the principle of energy storage capacitor discharge realization brake, it can be..
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Dimmer Switch - Dimmer Switch Working, Installation, Circuits and Explanation....
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Here`s something that might intrigue you Crystal Radio builders out there: A one-transistor (Silicon, yet!) AM broadcast receiver that derives its power from ambient AC hum and `spherics [static crashes]! Gotta give credit when I can: The germ of the....
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This design was born of frustration with the mic preamp in my Sony R91. It clips at ridiculously low levels, basically it has 28mV of headroom to deal with an input that could be as high as 1800mV (depending on mic & volume), so this design attempts to cure....