Popular Circuits Page 249
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Honda XL100 electrical schematic. Features: shows the connection between Honda parts. Component: Silicon rectifier unit, wiring harness, tail light sub cable, tail/stop light, high beam indicator, m light, speedometer, tachometer, fuse headlight control....
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F232 is USB powered, but you need to have a level translator at the output of F232. Tx of f232 has to be converted to RS232 levels, since the other side has a max. Receive pin can be easily opto-ed. But the transmit pin, need to have a supply in line with....
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The high voltage electrolytic capacitors in valve equipment tend to deteriorate if the equipment is not used for an extended period. This deterioration takes the form of reduced capacitance and greatly increased leakage current. In some cases, the capacitor....
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An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes advantage of the resonant properties of an inductor and a capacitor connected in parallel to receive weak AM stations. The "loop" part of the antenna is the inductor,....
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This radio was purchased on eBay as not working, and obviously missing all tubes and tube shields. I was told that it is a relatively rare set, being a Philco and a 32 volt farm radio. Most 32 volt radios I have seen were made by Delco, Silvertone, Coronado....
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The general (and very basic) principle of operation is shown in Figure 1. The test signal is simply derived from the mains, and is a sinewave at 50 or 60Hz. In most locations, the sinewave will be distorted, but this barely matters. With nothing connected to....
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This circuit can be used for multiple cameras with one monitor. The circuit can be operated manually or automatically. When operated automatically the swi....
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This metal detector schematic circuit is based on a transistor radio as an detector .This metal detector is total different that other metal detectors, because this circuit doesn't have a speaker . With the radio tuned to a weak station you must adjust the....
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The PCB we have made is big and has plenty of space for cutting and adding other bits and pieces. But if we want the final satisfaction of seeing it working, mounting the lot on a real bike, it is a bit too big. Way back in chapter one, we discussed sensors....
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BR Communications (later merged with TCI to become TCI/BR, later bought by Dielectric Inc ) makes a line of chirp sounder transmitters and receivers. See my RCS-5 Chirp Sounder page for more on this. One of the features of the Chirp Sounder system is that a....
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Here is the circuit schematic of a simple audio surveillance system in which the transmitter will pickup sound from one location and the receiver at other location will reproduce it. The receiver and transmitter are connected by only one set of wire. Here....
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A CMOS constituting the spot welding time adjustment circuit b The number of cycles it uses CMOS device composed of a control circuit, optionally in the range of 1 to 99 cycles..
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I had initially planned to do an LCD tutorial a little further down the line, but there was very high demand for it, and I already had a circuit assembled for testing the new LCD that element14 sent me to evaluate. So, this seemed like an appropriate time to....
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The post explains a simple delay ON circuit which allows the connected load at the output to be switched ON with some predetermined delay after power switch ON. The explained circuit can be used for all applications which calls for an initial delay ON....
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This doorbell circuit produces a low tone that will slide up to higher frequency. The equivalent total resistance connected between the base of Q1 and ground (Rbg), and coupling capacitor C1 determines the AF oscillator`s frequency. The resistance (Rbg) is....
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This is the Tesla Coil circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the Tesla Coil circuit and to simulate it online for better understanding..
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One of the more difficult aspects when making a control or security system that uses a PC (a burglar alarm using a PC, for example), is the connection of the sensors to the computer. In addition to typically requiring specialist interface expansion boards,....
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Here is the schematic of a simple flouroscent lamp driver circuit based on two transistors. The circuit uses capacitive ballasting for driving the tube. An 8 W standard flouroscent tube can be efficiently driven using the circuit. The two transistors (2Sc....
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For household or industrial application purpose, we are bound to use fixed ac voltage input. If we try to use this variable ac voltage as input to our regular usage machinery, such as lamps, fans, TV etc. then it would cause severe damage to our instruments.....
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The quartz clocks which have dominated time-keeping for the past 20 years or so have one problem: their errors, although slight, are cumulative. After running for several months the errors can be significant. Sometimes you can correct these if you can....
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The following page outlines detail information on how to step by step design a Simple Heat Sensor Circuit. This circuit design utilized LM741 as the operational amplifier...
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TL072 a low noise JFET input operational amplifier with features such as common-mode input voltage range, high slew rate, operation without latch up, compensated internal frequency, high input impedance at the JFET input stage, low noise, low total harmonic....
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This project demonstrates a computer control interface using a USB Board. (USB INTERFACE PROJECT). This tutorial will show you a simple way to control some device like led, motors and other devices with computer through a USB Board. The traditional way to....
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The usual chargers of battery automotive, are simple and cheap appliances that charge continuously the battery, with a rythm of few amperes, for the time where the appliance is ON. If the holder do not close in time the charger, the battery will overcharge....
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Analog sound KD156 have lingering Ding Dong sound of birds singing and the integrated circuit ..
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I have been working on driving an analog VU meter based on the sound going out the Raspberry Pi`s audio outputs. This now works! The music [1] is playing from a Raspberry Pi, with software running on the Pi digitally sampling the peak output audio level and....
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A low-distortion Meacham-bulb-stabilized Wien-bridge oscillator is used to acquire the FFT of a pure sinusoid of about 5 kHz....
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This application note presents practical design considerations
for battery chargers employing Green Mode FPS
(Fairchild Power Switch). It includes designing the
transformer and output filter, selecting the components and
implementing constant current /....
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It may be easy to find a precision voltage reference for your application; however, a programmable precision reference is another matter. The circuit in Figure 1 yields a precision reference with an LSB of 62.5 µV. The circuit is a 16-bit DAC using three....
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The circuit is that of a multiple feedback bandpass filter. A short click (pulse), makes it ring with a frequency which is its natural resonance frequency. Oscillations die away exponentially and closely resemble many naturally occuring percussive or plucked....
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This is a computer I built for my car, its an MP3 music system but can also do other tasks. Based around a super-small sub-micro ATX motherboard from a computer known as the BookPC BKi810, I have put the motherboard, hard drive, and a 12 volt power supply in....
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A car courtesy light in a standard car without a board computer is often a very simple thing: you open the door, the interior light is switched on, you close the door, the light is switched off. For convenience, it is very nice to have the light switched on....
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Note that the function diagram for either the 5443 and 5444 are identical, assuming a 16-pin dual In-line package. The difference resided in the internal connections as shown in the functional schematic and how the inputs are decoded. That is, the pin-out....
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The Demodulating Receiver (A3017) contains a 902 ’930 MHz 30-dB amplifier, a downshifer, a 60-dB 50-MHz limiting IF amplifier, a frequency discriminator, and an amplitude demodulator. The A301701A circuit board also includes, just for good measure, more....
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Feedback is the same as a conventional op-amp voltage follower which yields 11 unity-gain, noninverting output. This hookup also has a very high input impedance. The only difference between a track-and-hold and a sample-and-hold is the time period....
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This series-feedback series of compounds give a high input impedance and stable, gain wide-band video amplifier for general purpose applications. This is the figure of the circuit;..
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This 6" x 18" clock needs 52 light sources. It may one day allow humans to know the time without glasses. For 25 years we searched for clocks big enough to be see without glasses. No large clock existed commercially so our only resort was to have clocks....
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Light Switch With Relay is a series of electronic switches that are controlled by a series of light received. Light Switch With Relay circuit can be used to control lighting automatically, so the lights can automatically turn on when the room light or the....
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This is simple circuit that illustrates the function of the programmable unijunction transistor. It may be quickly wired on a proto-board. PUT Flasher Spec....
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To produce a modification that provides automated locking of the Scorpios central locking system upon a preset speed threshold. This provides increased security and safety. Various methods are available to calculate the velocity of an object; here we only....
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Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load current of the supply transformer/rectifier section was 4.4A. It tapers off to 4A at 13.5V, 3A at 14.0V,....
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V-USB is a software-only implementation of a low-speed USB device for Atmel`s AVR ® microcontrollers, making it possible to build USB hardware with almost any AVR ® microcontroller, not requiring any additional chip. Supports multiple endpoints: one control....
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Ions are defined as electrically charged atoms. Positively charged ions have a deficiency of electrons, and negatively charged ions have a surplus of electrons. An ion can also be classified as an atom or molecule with an electrostatic charge. Another....
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This circuit is made to be an alarm, both for home and handbags. If it is installed for home it will placed on door or windows, and if it is installed for bags...
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Figure 1 circuit uses a single +V power supply, and a voltage output DAC AD5620. DAC input by an SPI port control. DAC output swing from V to +5 V. Within the DAC chip referenc..
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You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16. 5V. It can deliver a current....
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This a application circuit for calibration. This circuit is called high voltage AC calibrator circuit. In another dimension in sine wave oscillator design is stable control of amplitude. This is the figure of the circuit. In this circuit, not only is the....
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Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the thermistor and 47k resistor makes a cold or frost alarm....
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The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency....
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This area shows the construction and testing of a new half-wave (dual) Tesla coil. This type of coil has two secondaries driven by a single tank circuit. The design shown here is a small and rather in-efficient dual coil constructed from scrap parts for....
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With this circuit, the LED blinks every half second. How long the blink time is, can be adjusted by adjusting the value of capacitor C1. Up to 18 additional LEDs can be attached to this circuit (36 LEDs total)...
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Circuit Description: Under inject mode, the calibration circuit provided in the audio range square wave output, power harmonics can be heard several Hertz. Under Tracking mode,..
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This circuit uses a ring counter made up of Q3, Q4 and Q5. Q2 acts as an oscillator which triggers the SCRs Q3, Q4 and Q5 in sequence. When an SCR fires, a 0. 2 F ca-pacitor provides commutation, shutting off the previous stage. Triacs Q6, Q7 and Q8 control....
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Here the long range/distance Infrared transmitter circuit, give you extra power for your Infrared transmitter. The majority of the IR remotes do the job reliably within a range of 5 metres. The circuit complexity increases in case you desig....
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At times, a µC must read a large number of DIP switches, such as for system identification, bus-address setup, manual configuration, or other purposes. However, the available number of I/O lines is sometimes not enough to assign a switch to each one. You can....
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This circuit can generate voltage 15V. In these circuit LM340 input voltage must remain within the limits specified in the data sheet. If the device is operated above the absolute maximum input voltage rating, two failure modes can occur. With the output....
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As we know its on chip multivibrator means with IC555 one can design astable, monostable, bistable multivibrators. Its main applications are to generate timings, clock waveform, generate synchronizing signals, square wave oscillator and many more. So here we....
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LM3876 based 50 watt audio amplifier circuit. Operates from +/-35V DC. Simple design, low noise,....
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Three devices in a quad Schmitt Trigger and a Flip-Flop make a simple but sensitive proximity sensor..
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Supports LCD Module (16x2 HD44780) Includes AVR Micro ATMEGA168 programmed with demo/test code. Top Quality US made PCB (w/Solder mask, Plated through holes, RoHS compliant) Designed by a long term amateur radio operator(N3ZI) and engineer (BSEE)....
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The low Rds and high peak current capability ofthe DG419 makes it ideal for discharging an·integrator capacitor. A high logic input pulse disconnects the integrator from the analog input and discharges the capacitor. ..
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The Talking Phone Dial Monitor detects the
tones generated when numbers are dialed
on your touch tone telephone and speaks
the numbers that were dialed. This verifies
that you dialed the correct number and is
especially useful when the keypad is not....
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Using a wire connection, use NFA.55 timebase circuit delay type light touch switch, it can directly replace ordinary mechanical switch, without having to change the original interior wiring...
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A unique circuit design sound and light control delay stairs walkway lighting switch, it has a higher voice sensitivity. In the evening, when someone walking on the stairs r, f..
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Figure 9 is a detailed schematic of Figure 8s concept. The
resonance loop is comprised of Q4 and the CMOS inverter
based oscillator. The amplitude loop centers around the
LT1375 switching regulator. Figure 10 shows waveforms.
Traces A and B are Q2 and Q1....
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This meter differs from the norm in that it does not use a D`Arsonval movement or digital display to give a reading of the input frequency. Instead, the measured frequency is read from a hand-cali-brated dial. Any audio signal applied to the circuit is....
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This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. The mixer is shown with two inputs, but you can add as many as you want by just....
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It plugs into the USB port and is just the shot for checking motherboard switch and jumper settings. Many readers will remember a commercial product of a....
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The challenge of this project is to create a model of a capacitive touch screen, including physical modeling of a user`s finger, the touch screen materials, and the touch-detection circuitry. A capacitive touch screen works by measuring the change in....
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A voltage divider consisting of Rl, R2, and R3 is used to set the input reference voltage below which the batteries are to be replaced. That reference voltage, at point A, is varied by Rl. With the voltage divider shown in Fig. 9-7, a range of 2 to 3.5 Vis....
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An interesting circuit of a bicycle horn based on a popular, low cost telecom ringer chip is described here. This circuit can be powered using the bicycle dynamo supply and does not require batteries, which need to be replaced frequently. The section....
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Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the sound quality, this is usually not a problem because there are plenty of SCART to Cinch adapters available....
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The KA2284 are a monolithic integrated circuit disigned for 5-dot LED level meter drives with a built-in rectifying a amplifier, it is suitable for AC/DC level meters such as VU meters or signal meters. Disclaimer All files are found using legitimate search....
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This circuit will charge a 12v battery (10 NiMH cells) @ approx 220mA.
It is a very simple circuit but requires correct setting up.
The circuit is designed around a 12vDC, 500mA plug pack. This type of plug pack delivers about 17.5v to 18.5v DC on....
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Schematic diagram in hard copy relating to the computer CSIRAC. Possible date 1961. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the....
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The circuit M8031 has a built-in RC oscillator and digital envelope circuits that make it to require few external components. The sound generated by the M8031 simulate an mechanical ding-dong sound. The M8031 operates from a low input voltage from 1. 3 to 3.....
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The analog interface is a very simple analog to digital converter which accepts the analog video output of the RF/IF board and puts it into a form that can be read by a PC Games port. The joystick input of the games port essentially converts a resistance in....
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As an integral part of an advanced computer science course in microcomputer systems it was thought that students could benefit from the design of a single board computer system based on a readily available microprocessor. This led to the project that is....
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The wireless fm transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250....
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The circuit was designed based on the operation of Siemens UAA180 as it functions as a LED driver for light band displays for measuring the level of audio signals...
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I have had a lot of queries about getting a low power negative supply in cars, to power Linkwitz transform circuits and the like. There is a switchmode converter, but I must admit that it is overkill for what most people need. Another project describes how....