Popular Circuits Page 7
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Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transistor based design. Home made Tilt sensor for this circuit is an ordinary little glass/plastic bottle....
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Circuit as shown by the l2kHz the intermediate frequency oscillator, an alarm circuit. It uses variable feedback oscillation circuit, the oscillation frequency is mainly determ..
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This gauge uses a sensor in conjunction with R1 to develop a dc voltage proportional to oil pressure. IC1 and IC..
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A constant-current/constant-voltage linear charger for single-cell lithium-ion (li-ion) can be constructed using only a tiny battery charger controller chip EUP8054 and a few passive components. This tiny integrated circuit chip is suitable for various....
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The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
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6-lOkV bus segment at the circuit breaker should be installed, but when any of the following circumstances, can be equipped with isolating switch or load switch or isolating co..
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Drying the motor winding circuit current imbalance Below is a circuit diagram of the motor winding current imbalance drying: ..
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An attempt at an Arduino guitar pedal. The guitar signal feeds through a PT2399 delay circuit, modified to include a JFET preamp phase. The delay circuit has Echo and Delay knobs. From there, it feeds into an optoisolated-Arduino-5V preamp, and out to the....
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Propclocks are really pretty complex devices, utilizing a PIC microcomputer that performs instructions at 10mhz. The PIC is the brain of the device and does most of the work involved in making the LEDs light up at just the right time so that it appears there....
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This discussion continues on from the audio tone control topic, which introduced both passive and active tone controls. The follow on topics might be a 2-Band Active Tone Control, or the 3-Band Active Tone Control. An audio equalizer is used to adjust the....
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The following circuit shows about UHF Indicator Wavemeter Circuit Diagram. This circuit using dual BF494 Transistor. Features: oscillator is ....
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Circuit, the comparator Al, A2 is a single trigger timing device. When the light is interrupted, photodiode VD of current changes. Al output trigger A2, A2 output goes low and ..
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DC current (Battery) is needed by the carbon transmitter to make the phone work. The way the telephone company does things is to feed battery to a telephone line using a device that allows the DC (Direct Current) to flow but does not short out the AC....
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The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC`s are easily damaged by short voltage spikes. A fuse will blow when its current rating is exceeded, but....
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The following diagram is for the main circuit of the motor driver.
A testing version is shown near the end of this page. It is laid out differently and shows the SN7474 in logic block form and LED`s are used to indicate the motor coils being switched...
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Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is MK484 AM radio IC. It is a high sensitivity and high quality IC, it has only three leads and comes in TO92 package and require only few external parts because all....
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A “Cell Jammer†is just way of saying “Dirty Transmitter†which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better. T....
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The electronic diagram of the monophonic FM receiver made with TDA7088T is shown on Pic.4.12. If built with SMD components it can be placed in a matchbox, altogether with two button-type batteries. The operating principle of this device is given in the....
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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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With bass boost compensation for the practical power amplifier circuit. Follow the instructions on the subject of the amplifier circuit element parameters, when the switch Sl, S2 are disconnected,..
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The ADI Company one ADM1066 is it monitor one piece powers many kinds of of configurated /sequence device, and last 12 ADC and 6 8 DAC of voltage output, all voltage is superior to 0. 5% in the precision of 25 degrees of C, is mainly used in the office....
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This circuit uses a 555 timer that is setup to each runn in associate Astable operative mode. This generates a nonstop output via Pin three within the type of a sq. wave. once the timer`s output changes to a high state this triggers the a cycle the 4017 4017....
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Here's the schematic for my Bee Counter test board with the functional units labeled to make them easier to discuss. This test board has the same circuitry as the larger board, but with only 4 gates instead of 44 to save a TON of time and money debugging....
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The following circuit shows about Electrical CIrcuit Diagram For 1976 Dodge Aspen . Features: The value of the current register of IC DS2760 ....
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Light-emitting diodes can be used DC, AC and pulse and other drivers, resistance typical buck LED display circuit as shown in Figure 13-1...
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This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to drive the piezo transducer. R5 sets the switching....
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Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-....
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Crystal oscillators are those in which a specially-cut crystal controls the frequency. CRYSTAL-CONTROLLED OSCILLATORS are the standard means used for maintaining the frequency of radio transmitting stations within their assigned frequency limits. A....
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For one thing the Krohn-Hite 5100A VCO takes Zero to -17 VDC to drive the VCO output frequency. But the O-Scope X-axis wants 0 to +5. 7 volts to have the X-axis represent increasing frequency to the right. So, the O-Scope frame had to float to get -Volts....
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The DC Brushless Fan is the best solution for now, but some predictions are that computers will soon be at 70dBA or the same noise level of freeway traffic. In the future we all may be liquid cooling but the heat has to go somewhere. Since the DC Brushless....
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Circuit shown in Figure 3-141. The line autotransformer voltage starting, dynamic braking. Figure, SBi buck start button, SBz the stop button. Buck start-up time by the time re..
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Automatic AC voltage regulator circuit TXD1742 continuous adjustment ..
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The gate drive that phase controls the four parallel SCRs is accomplished with complementary MOS hex gate MC14572 and two bipolar transistors. This adjustable line-synchronized driver pennits SCR conduction from near zero to 180 degrees. A Schmitt trigger....
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This circuit is a monostable multivibrator, or one-shot, made with a 555 timer chip. Click the logic input on the left (the "H"), and the output goes high for a short time, and then it goes low again. A timing interval starts when the trigger input ("tr") is....
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This Design Idea describes a versatile test circuit for zener diodes after yet another misread zener diode had infiltrated the ranks of 1N4148 diodes assembled on a pc board. As a bonus, the circuit can serve as a moderate-voltage, power-limited adjustable....
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This circuit is built around two chips: the MC1458 dual op amp, configured as a preamplifier, and the LM378 dual4-watt amplifier. The gain of the preamp is given by R3/R1 for one side and R4/R2 for the other side, which is about 100. That gain can be....
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To drive relay you need more than 20mA the current can one pin drive. This is why you cannot connect relay directly to microcontrollers pin. To drive relay you need to connect simple amplifier made of one transistor. This circuit is more general as instead....
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The PWM control dimming halogen lamp circuit is as shown. Rated voltage of the halogen lamp is 12V, the nominal power is 20W, the dimmer circuit can adjust the intensity of halogen lamp from zero to maximum. Lighting halogen lamp always transforms the....
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This smart doorbell system is designed for use in industrial environments. It is microcontroller based and controls a horn and a flash light....
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An automobile permanent magnet alternator failure, the phenomenon of cars at night driving, headlights suddenly increase in brightness, then goes out. Analyzing the generator v..
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As shown in Figure 3-109/connection of two-speed motor stator winding lead wire connected coils, ..
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The post discuses how to modify an ordinary square wave inverter using IC 4047 into a modified sine wave inverter through PWM technology. The idea was requested by Mr. Philip I am a Nigerian living in Nigeria and I have been an avid follower of your blog and....
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The Radio Hat was a portable radio built into a pith helmet that would bring in stations within a 20 mile (32km) radius. It was introduced in early 1949 for $7. 95 as the "Man-from-Mars Radio Hat. " [1] Thanks to a successful publicity campaign, the Radio....
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Diploma Final Year Project represents the culmination of our learning process, where it is a must to put into use from previously learned engineering and personal skills. The assessment has a major influence on decisions regarding readiness to graduate. This....
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We can also take output from collector terminals of the transistors, such circuit is show below. To know the working of below circuit you must read How transistor acts as a switch ..
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In the typical dynamo charging circuit, B+ and B- are the battery connections. D+ and D- go to the dynamo brushes, while DF is the field connection, with its other end returned to D+ inside the dynamo. Please note that not all dynamos return the field....
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Programming is very straight-forward when this programmer is used in conjunction with the easy to use DOS-compatible software. No requied power supply...
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The circuit consists of four stages of active bandpass filtering provided by two type-µ integrated-circuit dual op amps and includes a simple threshold detector (diodes Dl and D2) between stages 2 and 3 to reduce low-level background noise. Each of the four....
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When you want to build the lead-acid battery charger project for 6V battery or 12V. Although there are many methods to choose from. I like using IC LM317....
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Take the voltage output from a 3. 5mm audio jack and have it light up an LED according to it`s voltage. I was going to attach the left audio cable to the base of a 2222n transistor which would act as my amplifier to trigger the LED to light. Unfortunately,....
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a miniature version of the classic PONG game. The PONG game was invented back in 1966 by Ralph Baer [1, 2]. In the seventies the game became very popular and I remember that as a child I was completely fascinated by it. We had a later version at home, and on....
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Core multi-resonant circuit 40 L06 collapse is 1C.. Auxiliary electric f below its low threshold, open Icl. Output (2 feet) for the business l NIE., CI by D1 and Ri fast chargi..
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For a transistor to conduct, it requires a voltage of about 0.6 between its base and emitter. This voltage is applied from the wiper of the 47K pot. Now if the pot is at minimum, this voltage is across the 22K, so the 47K will have about 1.28v across it - or....
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Figure 16-29 (a) of the trigger output via a resistor R2; FIG 16J29 (b) for the introduction of programmable single-junction transistor PUT trigger circuit. Adjustment potentio..
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A 4017 decade counter/divider driven from a low-frequency oscillator (Ul-a and Ul-b) is used to drive transistor switches to sequence the windings, as is needed. MOT1 is a 12-V stepper motor. R9 and RIO are selected for the motor`s current rating. A 3.3-Hz....
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Discrete components ultrasonic transmitter circuit T/R-40-16 can emit a series of ultrasonic signal of 40kHz. This circuit voltage of 9V, operating current of 25mA, control dis..
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Using this 555 timer DC motor control electronic project you can control speed of a 6 volts DC motor, by simply rotate left or right the 50 k potentiometer...
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Optically isolated phone automatic recording interface circuit, IC3 voice module...
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This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set to any desired value....
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This is not very critical and any other device (such as tape player with message recorded on an endess tape) which does not overload the circuit or the telephone line, may be used. The incoming line is protected by metal-oxide varistor (MOV) RDN 130/14....
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The objective of this project is to use inexpensive PIR sensor to detect if a human has moved. To build this project I use a PIC18F25K20 microcontroller to detect if the sensor had change state and it will emit a sound from the speaker or piezo, the MCU also....
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This is a common control voltage in industrial and telecommunications equipment, so the relays are common in surplus equipment. Many will actuate equally well on AC or DC, which makes them an easy solution when the control voltage is switched mechancially,....
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a magnetic pickup from an old record player can make a great pressure, and vibration sensor. replace the needle with a plate of thin metal (copper off a pcb is good, ) and you`ve got an incredible touch sensor. use this circuit to amplify the circuit before....
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The linear charging ramp is most useful where linear control of voltage is required. Some possible applications are a long period voltage controlled timer, a voltage to pulse width converter, or a linear pulse width modulator. Ql is the current source....
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AM radio receiver circuit employing FM IC chip as the main component. This AM radio receiver circuit uses hand-wounded coils to tune the frequency at AM bandwidth..
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Electronic Project Eprom Emulator This EPROM Emulator was designed to compliment the EPROM Programmer (Mark 2)....
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This circuit will generate a smaller DC output voltage from a larger DC input voltage.It is quick and simple to make and by changing the value of the zener diode, the circuit can be universally adapted to provide other output voltages.The circuit and all....
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Positive output step-up and step-down de-de converters have a common limitation in that neither can handle input voltages that are both greater than or less than the output. For example, when converting a 12-V sealed lead/acid battery to a regulated +12 V....
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Circuit T as principle: In this circuit, a laser diode LED, as a light hair emitter, in addition to other properties may also be used similar light emitter laser diode substitu..
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The power controller module used in the system takes input directly from a momentary switch and uses that to toggle a relay that passes mains power to the system’s transformers. The controller circuit operates at 12V and as I understand was chosen to allow a....
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Software-defined radios (SDRs) are used in all areas of communications including ham radio and SWL..
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This is a simple SCR based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. It`s designed to be used with the usual types of normally-closed input devices such as - magnetic-reed....
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In this article, we will connect a stepper motor to our computer`s parallel port, and then we will write some code to control it with the scroll wheel on a mouse ( video ). If you have never worked with stepper motors, you will surely have a lot of fun with....
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Direct Digital Synthesis (DDS) frequency generation has been around for quite a while, but most of the homebrew DDS projects are rather complex and use expensive chipsets. Murray ’s exciter has only 3 inexpensive IC ’s,and the whole thing can be built for....
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The T7024 is a single supply front-end IC especially designed for applications in the 2. 4 GHz to 2. 5 GHz frequency band. The front end consists of a Power Amplifier (PA), a Low-Noise Amplifier (LNA) and a Switch driver for a PIN Diode Antenna Switch The....
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To change the frequency of the output by the dividing ratio of the comparison frequency in the 10KHz unit, the dividing ratio is fixing on 1024 at the circuit this time. Because the 144-MHz bandwidth of the amateur radio is 2MHz(144. 0MHz to 146. 0MHz) in....
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This page describes a cheap and simple yet flexible HDMI to parallel 3.3v interface. This allows to connect most LCDs frames to the beagleboard without any further interface required. I am using this myself with some 7inch 800x480 displays which i am using....
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Industrial, automotive and telecom applications pose
tough design challenges due to harsh operating environments
and large voltage transients on already high (12V
to 48V) rails. Some switching power supplies are robust
enough to provide localized low....
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A common emitter amplifier (1) Total pole amplification circuit structure and key emitting device common emitter amplifier circuit refers to the emitter (e) of the input signal..
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The CGS89 is a sequencer designed for delivering pulsed or gated events, for rhythm and percussion, triggering other sequencers, or selecting stages in Programmers such as the Serge R15 PRG. It can be used as a replacement for the first generation Serge R10....
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Error processing segment is converted to a pulse width modulated (PWM) signal output from 3 feet (MC signal). Also calculate the differential position error, which represents t..
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As shown for the portable hearing aid circuitry, which is the input coupling capacitor C1. C2 for the filter capacitor, to prevent internal bias signal input circuit caused by ..
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The GS4882 and GS4982 are precision sync separators for
extracting timing information from NTSC, PAL, and SECAM
video signals. The GS4882 generates noise immune and
temperature stable composite sync, vertical sync, back porch
and odd/even field signals.....
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The medical treat ventilator controller circuit is composed of astable oscillator, control circuit and power supply circuit, it is shown in the figure 9-155. The astable oscillator circuit is made of resistors R1, R2, potentiometer RP, capacitors C1, C2 and....
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As shown by W317 is being integrated three-terminal adjustable voltage regulator circuit consisting of a battery charging applications. FIG. (A) given constant pressure limitin..
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This is a simple 1. 5V powered LED Flasher circuit diagram. This circuit can flash 1. 7V or 2. 3V LED (depend on the color) using 1. 5Vdc input. The LED will turn on when the 100u capacitor jacked up by the collector of BC557. The circuit is a charge-pump....