Popular Circuits Page 112
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This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
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This window comparator generates an output pulse for each event that occurs within a specified window. That is, each output pulse signifies an input voltage pulse or level change that exceeds VREFLOW. but not VREFHIGH· The monostable multivibrators, IC2A....
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Circuit shown in Figure 3-107. Figure, SBi is running at low speed button, SB2 for the high-speed operation button. ..
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Car Reverse Horn can be used in car as reverse horn circuit diagram using melody generator IC CTC2877 and amplifier IC AN7148.various automobile project with description...
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Q1, Q2 & Q3 form a high impedance super-Darlington that drives the relay, amplifying the 50 or 60Hz alternate mains-supply frequency induced in the sensor by the human body. C1, D2 & D3 ensure a clean switching of the relay. Power supply can be any....
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Motor shields worked well - but they cost around $50 each, more than the Arduino itself. That`s fine for a single one, but I`m teaching an Arduino workshop (this Thursday!) for high school girls, and I needed something I could buy more cheaply so I could get....
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The variable voltage regulator lets you adjust the output voltage of a fixed de power supply between 1.2 and 37 V de, and will supply the output current in excess of 1.5 A. The circuit incorporates an LM117K three-terminal adjustable output positive....
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Magnetic pick-ups in musical instruments have a relatively high output impedance. This can result in a reduction in treble response when connected via a long cable run or to equipment with a low input impedance. This preamplifier provides a high input....
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This part of my site features a stereo decoder circuit suitable for both my pulse counting FM Receivers and other types of FM Tuner, such as the old valve type that incorporates a Foster Seeley or Ratio Detector. This particular stereo decoder IC, MC1310P....
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Stepdown transformer T1 drops the incoming line voltage to approximately 48 Vac which is rectified by diode D1; the resultant de charges capacitor C1-through current limiting resistor Rl-to a voltage level preset by R4. When the voltage on R4"s wiper....
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An alternative approach for this application takes advantage of low-offset op-amp characteristics to design a circuit that works with a wide voltage range and needs no other supply. The V+ and inverting and noninverting terminals of the OP07 op amp need a....
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Cal-(IT)2 is developing several generations of general broad application radio/networking test platforms for wireless research and development. CalRadio I is the first generation. It provides a simple, low-cost platform for 802. 11b development from the MAC....
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Both versions have the schematic attached. However, the resolution of the schematic isn`t that great. I would recommend saving the image above or downloading it from HERE to ensure you can see everything accurately. There isn`t an easy way to shield yourself....
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Capacitive touch sensors are based on the electrical capacitance of the human body. When, for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. This effect can be used for proximity detection and....
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AD2S80A represents a typical application circuit, give a specific peripheral connectivity and device parameters. As illustrated, it is provided 12bit (SCl-0, Sc2 1), to select ..
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As shown for the basic differentiating circuit. The differential operation circuit can input and output, the relationship between the output, between the input: ..
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This circuit is for a simple LED `bar graph` voltmeter. Each op-amp of the 339 quad operational amplifier is used as a comparator for comparing the input voltage Vin against a corresponding voltage level that`s a fixed proportion of the power supply (9V in....
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Circuit works The automatic anti-frost crop controller circuit consists of electric contact mercury thermometer Q, the control circuit and ignition devices and other components..
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The IQ_Mod project illustrates the use of the IQ_Mod_Setup and IQ_Mod_Data components in ADS. These components are part of the ADS behavioral model suite found under the System - Data Models palette. "IQ_mod_ckt. dsn" is a schematic for the modulator of....
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This low-cost operational-amplifier circuit (A) generates four different functions with adjustable periods. For the components shown here, the period of the output waveforms is given by T = 4RC and T = 2RC. With switch SI in position A, VI is a triangular....
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Although analog and digital controllers may appear vastly different, their principles of operation are usually quite similar. Therefore, popular analog tools like Spice can still be used to benefit common digital proportional-integral controllers through....
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Data Collection - Analog to Digital Conversion and Communicating with a PC through the Serial Port Microcontroller Advanced Kit....
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This is a high quality power supply with a continuously variable stabilized output adjustable between 0 and 30VDC. the LM 723 is the heart of the power supply which drives the BD137 and then the 2N3055. The circuit provides short circuit protection. And has....
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R "h sampling circuit limit order _" to reduce the sampling resistor. Plus DC voltage level can be placed between the..
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Some still remember the serial RS232 port or ports, or there is also a call COM PORT because rarely posrt RS232 function has been replaced with a USB port. But I`m sure, to electronics engineering student, or other techniques to learn techniques such as....
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A line follower is an autonomous bot that can follow a specific colored line painted on a surface of different contrast, such as white on black....
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I initially designed these circuits for a friend who had muscle problems and while he says they did work well for him, I "DO NOT" RECOMMEND THE USE OF THESE DEVICES BY ANYONE FOR ANY REASON. I ACCEPT NO RESPONSIBILITY OR LIABILITY FROM THERE ASSEMBLY OR USE....
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This Design Idea came about as a result of my not having access to those wonderful new ICs that sense current. I needed a discrete circuit that I could build easily but that would still be as accurate as the new ICs. This circuit seems to do the job. Q2 is....
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The LT1328, in the MS8 and SO-8 packages, contains all the necessary circuitry to convert current pulses from an external photodiode to a digital TTL output while rejecting unwanted lower frequency interference. The LT1328 plus fi ve external components is....
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The double-limit temperature alarm circuit by the temperature detection control circuit, the temperature indicating circuit and sound the alarm circuit, as shown in FIG. Components Selection R1 ~ R5 use 1 / 4W metal film resistor or a carbon film resistors. ..
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a more complex detector circuit which turns the relay on for an adjustable period of time. When the beam is broken, the LED goes on, your effect is powered, and capacitor C1 begins charging. As C1 is charging, the transistor will be kept on. Once C1 is....
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BE-150 mainframe computer switching power supply circuit The host computer is shown in BE-150-type switching power supply circuit, the oscillation control IC to switch TIA94. A..
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This is a license to use the files to make up to 12 boards. If you want to make more contact me. Please note that you agree to make 12 or fewer in your message when you order. You may not resell the boards. If you want to do that contact me...
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This electronic lighting dimmer circuit is used to control the lamp for arbitrary brightness. This electronic lamp dimmer circuit work for incandescent lamp, not a fluorescent one. The dimmer circuit here work for both 110V and 220V AC. The dimmer circuit is....
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This simple fm radio receiver circuit consists of a regenerative rf stage, TR1, followed by a two of three-stage audio amplifier, TR2 to TR4. In some areas....
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Manufacturers of cordless drills generally recommend a battery charging time of three hours. Once the charging time is up the battery must be disconnected from the charger: if you forget to do this there is a danger of overcharging the battery. This circuit,....
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This circuit takes two separate line-level stereo (L & R) signals and combines them into one stereo (L & R) output, thus avoiding the need to switch between two pairs of input signals. In the author`s application, it is used to feed the stereo audio from a....
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This project is an electronic lock with many combinations that you can easily change and opens only with the correct combination of four consecutive numbers. The big advantage of the electronic lock is that the four numbers must be entered in the correct....
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Here is a dual colour lamp to read the code printed on the Transistors and ICs. The code and number printed on the black coloured body of these components are difficult to read if the room light is low since the printing is in faint colour or as impressions....
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By the addition of one integrated circuit and some passive components, I was able to convert my earlier developed 40-meter direct conversion receiver design into a superhet model. Anyone who has listened to 40 meters during the evening hours on the crowded....
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This project is offered totally Free for those who are interested in it.
I have tried to make this article as complete as possible, but I will Not
assume any lilability for any "Errors or Omissions" in this article.
If Needed, I will attempt to help you....
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At the input of the operational amplifier plus a resistor - diode network can be constructed square-law function conversion circuit. Resistor - diode network and form a voltage..
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hi i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and....
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I`ve built a 555 based oscillator to drive ir led at 38khz. I`ve got the circuit wired up and I`ve used my meter on the duty setting to read that it is indeed generated a 38khz signal. I`ve also wired up a modulated IR receiver, the one from radio shack set....
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Adding two passive components to a standard photodiode amplifier reduces noise. Without the modification, the shunt capacitance of the photodiode reacting with the relatively large feedback resistor of the transimpedance (current-to-voltage) amplifier,....
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This is a simple two transistor lamp flasher circuit, which can be used to flash 6 volt lamp. The circuit is so small and can be easily fitted in a small box. The circuit is using two transistor one is NPN BC549 and the other is PNP BC556. The input voltage....
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FIG. 1 (A) illustrates the circuit diagram of one embodiment of the fluid level detector of the present design. The supply voltage for this circuit is typically provided by a 12-volt automobile battery which is reduced to a 5-volt DC source voltage by means....
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The LM1875 amplifier delivers 20 watts into a 4 © or 8 © load on ±25V supplies. Using an 8 © load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload....
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A band-pass filter is a circuit which is designed to pass signals only in a certain band of frequencies while attenuating all signals outside this band. The parameters of importance in a bandpass filter are the high and low cut-off frequencies (fH and fl),....
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This circuit can be used for multiple cameras with one monitor. The circuit can be operated manually or automatically...
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Just the solution for AVR applications in which I/O is tight, such as the ATtiny12. This should work well on other kids of controllers that have independently controlled I/O direction registers, such as PIC and 6805 controllers. This is a solution was....
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The video switcher described here can display the output of two, three, or four cameras on a single monitor. The number of cameras is set by a DIP switch on the circuit board. That feature avoids blank displays if less than four cameras are used by....
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Fresnel lens a thin disc of glass or plastic carrying a series of concentric stepped rings, each successive step from the central ring having the surface curvature of a much thicker lens Fresnel lens Fresnel Lenses for Rear Projection Systems, Film Fresnel....
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This is a circuit that can be used for detecting sounds and providing an output signal when a sound is detected. This output signal may be fed to another circuit that sets off an alarm when the signal is received. This circuit is therefore useful in security....
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Please help me out to understand *how this H-brigde is working? i tried but i couldn`t make any sense. i mean i know the general working of the circuit but i don`t....
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Adjust the component values in the two RC networks to get exactly the tones you want. 3V low stand-by current. Kit includes 1 x switch, 1Watt 8ohm speaker, 2 x AA batery holder, COB and mother board. COB PCB size: 16mm x 29mm. (CPSSG5)..
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The micropower circuit provides shutdown, power-up, and low-battery lockout functions automatically, without the need for software or operator control....
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This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works on FM radio waves. Car alarms can be used on vehicles that have a 6-12VDC power supp This circuit is a....
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This machine essentially does three things: It controls the process temperature, provides constant agitation of the chemical baths, and performs the timing. The operator must pour in and out the liquids by hand. The heart of the circuit is a Basic Stamp 2p....
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A device designed for measuring time and temperature used in chemistry laboratory. The circuit employs a 89C4051, 20-pin CMOS Microcontroller with built-in 4kB code memory. Temperature was measured by LM35D, National Semiconductor Temperature sensor....
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Rasbian on the Raspberry Pi is great, but the official image is large and includes all sorts of stuff I don`t need (my Pis don`t generally have screens as I use them for playing music, or being GPS NTP time servers, or collecting data on my power usage not....
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One of the most useful gadgets a video enthusiast can have is a low-power TV Transmitter. Such a device can transmit a signal from a VCR to any TV in a home or backyard. Imagine the convenience of being able to sit by the pool watching your favorite movie on....
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This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown dotted) will need to be included. A suitable value would be between 2. 2k and 10kohms.....
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Microcontrollers family AT89C has parallel programming interface of flash memory. In order to write information we need to supply programming voltage 12V and for controlling almost all pins of ports are used. This is why parallel programming is done in....
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The lighting source (i. e. bulb, tube light) glow according to their specified watt rating. If we need more light then we have to use high watt bulb at the same place if we need low light we have to replace high watt bulb with low rating. But What if there....
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The following is Chapter 4, part five of a five part series ""Some thoughts on DC/DC converters"" by the late Jim Williams and Brian Huffman from Linear Technology`s Volume II book entitled, ""Analog Circuit Design-- Immersion in the Black Art of analog....
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Batteries are one of the energy sources available onboard vessels which are used in case of blackout and emergency situations on board a ship. These batteries are used for low voltage dc system like bridge navigational instruments and thus need to be kept....
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If a page name is not selected by pressing the button, the previously selected page name continues to be used. The value is stored in EEPROM and may be changed at any time. When the unit is first powered on, and any time the Position page is displayed, the....
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It requires no doctors, drugs, or medical bills. The procedure involves sterilizing the blood of viruses, bacteria, parasites, fungus, microbes, pathogens, mycotoxins and coexisting foreign life forms and alien invaders and their byproducts by passing a....
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This project involves constructing an energy efficient broad spectrum LED lamp system. The lamp is useful for indoor reflective room lighting. It has a broad color spectrum that more closely approximates the light of the sun when compared to fluorescent....
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While discussing an all-linear automatic night light circuit I mentioned that I was testing an MCU-based ANLC. Well, I`ve been tweaking the firmware since. The other day I installed the sensor outdoors and have connected the circuit to control 220VAC loads.....
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This circuit is the improved hartley oscillator circuit, changing the base current can adjust the frequency in a given range. The output signal amplitude is higher than 6V in 6k? load resistance,and it is suitable for electronic cello circuits....
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The amplifier"s input stage is a dual-gate GaAs FET, which provides low input capacitance and high transconductance. The dual-gate structure accepts the signal on input 1. Input 2 controls the gain of the amplifier. The amplifier has a third input for use....
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Amplifier circuit is very suitable for use in subwoofer speaker, because its strong. This circuit using ic, ic based on STK. to use it can be used on cars that use speakers or a subwoofer system in his car. 30 V supply voltage that has been rectified. Power....
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Sometimes I can find a station and sometimes I can`t find any stations. Probably the main problem when tuning is, as soon as you move your hands or body, let go of the tuning cap or touch the 10k pot, whatever station you had on will either disappear or....
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Enthusiasts know that the headphones directly into the universal headphone jack to listen to VCD, the sound quality is not high and the tape player to listen to reason D headph..
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A 12v battery pack from a PowerWheels(r) car and two planks of wood with several nails punched through each. The nails were each wrapped with a couple turns of speaker wire that ran out to his ignitors, and the other leg came back to a central positive....
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This project was inspired by a series of QST articles by Hayward, W1PH. I based my rig on his April 1962 article, "Have You Tried 160 Lately ". I liked his simple, single band rig. I thought his use of 6V6 tubes, along with regulated voltages, to be a simple....
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This circuit will provide electric power from a backup battery when AC power is cut, always providing a clean 5V power supply for sensitive equipment like microcontrollers and logic circuits. The value of C1 is to be higher than 220 µF. The bigger the....
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Since the speed of the I2C bus can be rather high, it is recommended to use a fast optocoupler. However, this circuit will not work on speeds higher then 10KHz. A 6N139 will do the job in all cases. The two PNP and the two NPN transistors can be any standard....
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A 2-input NAND gate integrated circuit fabrication of digital delay lamp circuit, VD3, vs, after Composed of simple capacitive voltage rectifier buck crossing the half line, th..
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This HD TV UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 ? 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the....
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Compared to other operational amplifier, OP90 significant advantage in low power consumption. With its low power consumption, the power supply voltage adapted to a wide range (..
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IR remote control is a device you can find everywhere where you can find TV, VCR or home theatre. Why not to use one of them for controlling your own devices like light, air conditioning etc. As we know remote control devices uses IR light. This is invisible....
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I`ve now come to see cosmic ray detection as the poor man`s version of particle physics experiments. As the journey of construction, experimentation and interpretation of results, has meant learning a little bit more about the fascinating particles and....
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The motor controller is a custom built box that is a combination of custom printed circuit boards, the Pico Systems Universal Stepper Controller card, gecko G320 motor drives and internal power supply. The motor controller also links to the servos which....
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This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
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This jam circuit can be used in quiz contests wherein any par- ticipant who presses his button (switch) before the other contestants, gets the first chance to answer a question. The circuit given here permits up to eight contestants with each one allotted a....
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This circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio....