Popular Circuits Page 67
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The LM1830 fluid detector IC from National Semiconduc tor is designed to be able to detect the presence of fluids using a probe. This chip requires a relatively high supply voltage and is not the most frugal power consumer. It is also quite specialised so....
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The AM Tuned Radio Frequency (TRF) receiver, has a sensitivity of about 1 m V at tbe input for an audio output of "iz W. Capacitor C22 couples audio signals from the power line to the PC board-it must be rated at 600 Vdc. R8 will cause F1 to blow, if C22....
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The LM117 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 1.5A over a
1.2V to 37V output range. They are exceptionally easy to use
and require only two external resistors to set the output voltage. Further,....
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CodeLock AVR electronic combination lock is realised with Atmel AVR microcontroller AT90S2313 or ATtiny2313. Program in hex code is 2 kB long. User code is consisted of 1 to 4 digits. If you buy the chip than user code is consisted of 1 to 8 digits. If the....
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1995 Nissan Altima Brake And Tail Light Wiring Diagram...
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A 0th-level attack at designing a direct conversion AM radio receiver. "Direct conversion" means we use a mixer (which just multiplies two signals) to downshift the radio frequency signal to baseband (audio) frequencies. I still don`t really know how to....
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Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
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In normal we used to control the industrial equipments by manual operation. Hence it is to be updated step by step manually. It is overcome by a new mode of communication which is used to control all those equipments through a single message from anywhere.....
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As numerous or as few channels as are needed may be added to the mixer. Do this by just duplicating the input "sections" that are shown on the schematic design. An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals....
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M1 is a stepper taken from an old disk drive. There are five pins, i. e. , common, coil 1, 2, 3 and 4. Resistance measured between common pin and each coil is about 75 Ohms. Driving current for each coil is then needed about 60mA at +5V supply. A Darlington....
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You need to find a reliable full bridge driver to drive your flyback transformer? Well, This is your final stop. There are many flyback drivers schematics out there,
but most of them will not last for long. It is common known that famous ZVS invented by....
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The figures below illustrate using opamps as active 2nd order filters. Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the....
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This circuit operates as an oscillator and a timer. The 2N6028 is normally on due to excess holding current through the 100 k resistor. When the switch is momentarily closed, the 10 µ¥ capacitor is charged to a full 15 volts and 2N2926 starts oscillating....
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current during under-voltage lockout (UVLO). When VCC exceeds the UVLO+ threshold, the IR2156 BR>begins to oscillate and the Charge Pump circuit (CCP, DCP1, and DCP2) supplies the current to VCC ..
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In this article I will offer driver circuit for 12 V/5Watt fluorescent lamp, this circuit used a normal 220 to 10V stepdown transformer in reverse to step 12V...
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Here is the 1963 Mercury V8 Monterey wiring diagram. This is the right side of the wiring diagrams, earlier, we have shown the Mercury V8 Monterey 1963 Wiring Diagram Left Side Part. This wiring diagram is very clear, and it shows a complete components and....
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BFP640 used for 1575 MHz Global Positioning Satellite (GPS) Applications BFP640 is investigated for use as an LNA for 1575 MHz GPs Design Goals: Gain = 16 dB min, Noise Figure -14. 8 dBm min Printed Circuit Board used is Infineon Part..
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The IRPLLNR2 is a high efficiency, high power factor, fixed output
electronic ballast designed for driving rapid start fluorescent lamp types. The design contains an EMI
filter, active power factor correction and a ballast control circuit using the....
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I marked the approximate center of the base and drilled a hole large enough to screw the setscrew for the servo armature in. I then hot glued the armature to the underside of the base making sure not to get glue in the hole i drilled. I used 3 light sensors....
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The heart of an average reading, rms calibrated AC voltmeter is shown in figure below. It`s a rectifier and averaging filter. We can remove the averaging function and provide a precision full-wave rectifier by deleting C2 and provide an absolute value....
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While traveling, charging of the mobile phone, cellphone battery is a big problem as power supply source is not generally accessible. Battery will go flat....
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Because many amateur receivers are fitted with an S meter that functions far from logarithmically, the proposed circuit should be a welcome extension of such receivers. Although ICs such as the CA3089 or the CA3189 are not in common use anymore, they serve....
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This led series will Blinking alternately, The way it works is determined by IC NE555 and transistors are used as reinforcement for each section (20 upper, 20 lower) work optimally. 555 circuit below is a flashing bicycle light powered with four C, D or AA....
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Good information about USB Cellphone Charger Circuit You can learn and download USB Cellphone Charger Circuit online here....
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The size of the photoflash charger circuit is greatly simplified and reduced by Texas Instrument (TI) TPS65552A. A photoflash capacitor charger based on this....
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The circuit, consisting of an infrared transmitter-receiver pair, utilizes IR beam transmission to switch the toy car on` or off`, yeah. it will be only switching on and switching off, you may modify this circuit to make the toy car to turn left or right. To....
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If I use the internal 1. 1V reference for the ADC, and my Analog input exceeds 1. 1V, lets say 2. 5V, is that harmful to my microcontroller Or will ADC value simply clip (to 0x3FF) at 1. 1V Speaking from experience alone, not from datasheet references, so be....
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A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer. A single pole double throw sitch is used to switch between inject and trace modes. The....
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12V Vehicle Electrical Wiring Tester Circuit This little tester is useful for checking vehicle electrical circuits. Two LEDs indicate whether....
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The UBA is limited to discharging up to 2. 5A per channel. This discharge rate is adequate for testing 99% of the batteries on the market. It is not sufficient to properly test batteries that are rapidly discharged in normal use (for example, some medical....
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The output devices are MJL4281A (NPN) and MJL4302A (PNP), and feature high bandwidth, excellent SOA (safe operating area), high linearity and high gain. Driver transistors are MJE15034 (NPN) and MJE15035 (PNP). All devices are rated at 350V, with the power....
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Set R5 to read 1V RMS on an Audio Millivoltmeter connected to the output with R7 rotated fully clockwise, or to view a sinewave of 2. 828V Peak-to-Peak amplitude on the oscilloscope. An audio amplifier is an electronic amplifier that amplifies low-power....
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Train Horn Circuit Diagram based IC NE556. The circuit is quite simple and easy to built, also it is inexpensive. With this circuit design, it will not give high output power, so you need to add audio amplifier to make this train horn circuit louder. Imagine....
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This is a portable oscilloscope adapter that it can be held in breast pocket. Its operation is only sampling and sending to host PC. The most of functions of the oscilloscope are processed by host PC. Therefore, oscilloscope adapter can be simplified. This....
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This is simple 3-digits digital volt meter.PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply similar principles to measure DC current with parallel R shunt..
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This is a simple, but very useful circuit that can be used to transmit telephone conversations. When the telephone receiver is on hook the voltage across the lines will be about 48 volts. The preset R7 is so adjusted to obtain a 24. 7 V across between the....
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The purpose of this project is to develop a self sufficient Mailbox (real one) that will be powered only by the sun and that will display the number of the house, but only in accordance with the battery level. The system must work autonomously when there is....
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This cable tv amplifier circuit is a rf amplifier designed to be quickly installed between two coaxial cables. Both input and output impedances are compatible with 75 © cables. The main amplifier si T1 transistor, T2 is working as an emitter follower. The....
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This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value. The LED starts flashing when the photo resistor is scarcely illuminated. The onset of flashing can be set....
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I have since constructed a programming "jig" to avoid keeping the circuit on the breadboard. More detail, and photographs can be found on the Learning About the AVR Parallel Programmer page. ..
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We have a Subaru Brumby which has been with us for some time. Our mechanic says that the engine is ....
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When controlling motors with a microcontroller (like shown), the snubber is really pretty important. I haven`t seen this configuration, though, and typically the snubber is placed across the motor itself. The general idea is that there is charge that builds....
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As shown by simple smart temperature sensors based on I2C bus interface configured as shown thermostat controller circuit. LM75 through 2N3904 transistor to drive the relay coi..
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As shown for the level control circuit. The control circuit consists of step-down rectifier circuit, trigger circuit 555 (IC1, IC2), relay control circuit. Where the buck recti..
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For the input and output voltage without isolation but only with a working switch and L, D, C composed of an inverter circuit, its most basic form,..
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Do not trigger circuit thyristor AC switch circuit, due to its simple, economical, non-contact, so widely used. Circuit shown in Figure 16-43. It is a single-phase thyristor sw..
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The audio amplifier shown here is based on the TDA7240 IC from ST Microelectronics. The TDA 7240 is an integrated audio amplifier IC that can deliver 20 watts of audio output power into a 4ohm load. The IC has minimum external parts count and is available in....
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This again the one circuit that can is dc regulator the many voltage get simplely. Or Simple step down dc converter multi voltage. By have R1 be formed fix the....
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A few months ago Milardo starting to study the 8051 Microcontroller. From his research Miardo has designed a new circuit and called it 3-Digit Display Scoreboard with 4x4 Keypad Matrix....
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The circuit consists of N-MOSFET voltage follower T1 (common Drain) and current source T2 (NPN Darlington). Current source is set to 2. 2 Amps. With 40V of supply voltage the circuit is able to deliver about 17W into 8 Ohm loudspeaker. But takes 88W from....
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In personal electronics and computer audio system, the SSM2167 is a complete and flexible solution for conditioning microphone inputs. It is also very good for....
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A small electronic switch that connects a battery to the equipment for a certain amount of time when a push-button is momentarily pressed. And we have also taken the ambient light level into account; when it is dark you won`t be able to read the display so....
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This is a low cost fm antenna booster that can be used to listen to programmes from distant FM stations clearly. The antenna fm booster circuit comprises a....
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The microphone preamplifier circuit design presented in this schematic use SSM2015 produced by Precision Monolithics Inc. (PMI) which offers a high amplification and low noise ( 1. 3nV/ f). Has been designed to work with differential input signals and can....
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According to this Russian forum, the SR193 involves warming of the ferrite cores. See Electrical Parameters of Ferrites Source: Next Energy Forum,....
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Each power supply, whether linear or switcher, uses at least two operating modes that characterize its operation: constant voltage (CV) and constant current (CC). The power supply can work in either one, while the other is usually a protective mode, both for....
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Car and Motorcycle Battery Tester Circuit Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power....
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This mini audio amplifier will test the audio stages in amplifiers such as the front end of FM bugs. You can also use it on lots of our other projects as well as the output stages of radios. It is a very handy piece of test equipment and will make a perfect....
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Excellent clock generator to drive 4017 type cmos circuits. R1 = 10K to 10M, C1 = 100pF to 47uF. Fo is ±1Kz when R1=100K and C1=10nF. Input voltage can be from 5 to 15V...
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The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where you can plug-in your 120V AC appliance and control....
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The circuit on this page is for a visible and infrared light detector circuitboard that has 8 detectors. LM339 voltage comparators are the active element. These detectors can be used as part of other light detector circuits shown on other pages at this site....
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I have finally worked out this schematic as an exercise to learn about amps. There are a number of things i am not so sure about and would appreciate....
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The extension port has an important role. Depending on the application several extension boards can be put in the socket. Extension boards for LCD and domestic (relays, temperatur and light sensors, opto decoupled inputs) are under development. Sheet 1 shows....
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Vacuum tube tesla coils operate in a continuous wave mode of operation, continuously providing energy to the tesla coil secondary. As a result, the output is primarily determined by how much power the vacuum tube can process. The spark discharge and....
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FM24C256 as shown 27-54 slave interface circuit I2C bus, the address format shown in Table 27-3. A2, Al, AO is set to low (when extended storage capacity, the need to change A2..
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CAT3606 is a high efficiency white LED drivers, this adjustable charge pump is suitable for general-purpose, large-panel, flicker-free white LED backlight and dual-display syst..
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A real analog synthesizer to build using easy to get components, capable of a wide range of sounds. The two oscillators can be detuned for that classic synth sound. Dual oscillator mono synth. Really easy to build using just 1 custom programmed PIC chip, 4....
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The human eye is amazingly adept at tracking moving objects. The process is so natural to humans that it happens without any conscious effort. While this remarkable ability depends in part on the human brain`s immense processing power, the fast response of....
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Having found an u664b prescaler chip (Telefunken) from an old tv-tuner , I decided to build a valid frequency counter using pic16f84 , the prescaler I use is able to divide by 64 every frequency from 30 to 1300 MHZ. The original project is from Peter....
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Sensing unit consists of infrared emitter OP295 to produce the infrared beam, & two detectors in front of the emitter to detect the infrared beam OP598. Since the main idea in this device is to know person direction; and so, to get this approach, we have to....
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Mobile robots need simple and lightweight dc-motor-speed-control hardware that can work with low-power batteries. Flip-flop type navigation systems allow only one motor to operate at a time while the other motor remains off. Navigation direction changes....
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The design philosophy for this circuit was centered on replacing all of the op-amp circuitry found in the earlier circuits with discrete transistors and LC filters. The previous circuits had many (high quality) op-amps in series, this resulted in audible....
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The following circuit shows about Plant Moisture Meter Circuit Diagram. This circuit based on the LM741 IC. Features: meter indicate whether it is ....
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CRV-59AAE is 20" long by 9" wide by 10"high. It weighs a mere 33 pounds. It is at least 60 years old and in excellent condition. It represents some of the finest in miniaturized technology for its time. It uses an iconoscope tube as the imager. It contains....
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The power drain is approximately 150 mA. IC1 provides a regulated 5-volt supply for the filament heater of the sensor. The gas sensitive element is connected as one arm of a resistance bridge consisting of R4, R7, R8 and the meter Ml with its associated....
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AD170 basic electrical parameters are as follows: temperature coefficient of 25ppm/C, temperature measurement accuracy of l, the maximum temperature in the range of a 200 ~ + I..
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When the output of our multivibrator is low, Q1 (because it is NPN transistor) will be OFF and Q2(because it is PNP transistor) will be ON. So the negative terminal of capacitor C3 will be connected to ground. It will charge from the power supply and through....
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The circuit is based on a simple inductor-capacitor filter circuit, and needs only a pot and a small light bulb to set and stabilise the oscillation. The frequency is fixed, and with a good inductor should be capable of very low distortion. This circuit is....
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Circuit from the MAX1494 and thermocouple temperature measurement system as shown, MAX1494 termination of 1N GND 5-32. The use of an external temperature sensor (for example, DS75) and SCM can be done carry junction temperature compensation work. MAX1494....
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If your ear is good, you can use this IR-pulse-to-audio converter to troubleshoot infrared remote-controls. It is also a good project for detecting infrared-light sources. A photo cell module (Radio Shack P/N 276-137) detects IR radiation and drives audio....
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The concept behind the light dimmer is to control the voltage to the light lamp or any source. Light dimmers regulate the voltage to the source they are connected to. This regulation of voltage increases or decreases the light intensity. Light dimmers first....
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Make sure to double-check your connections using the circuit diagram and breadboard schematic (download from these links). You can use this while you....
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The CAN Interface is a Balanced (differential) 2-wire interface running over either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable. Each node uses a Male 9-pin D connector. The Bit Encoding used is: Non Return to Zero (NRZ)....
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The point being if it connects it`s good if it don`t it don`t, there`s no inbetween. If you got a solder joint it`s going to connect or it`s not going to connect, that`s it. 0. 25 to 4ohms come on really. Do they even make resistors that small to set it with....
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Circuit principle: After turning on the switch SA1,220V transformer transformer, bridge rectifier into DC, the computer control panel power supply. Root According to the barbecue food, the computer control panel set high or low temperatures. At the same time....
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Tl and T2 are 600 to 8 ohm transformers (any transistor radio output transformers with 500 to 4 ohm impedance may be used). Ql is a 2N2222 npn transistor, and Q2 is a 2N2907 pnp transistor. Dl and D2 1N270 signal diodes (HEP 134 or 135). Two transistors,....