Popular Circuits Page 62
- Page 62
-
-
-
LED 12 Volt Lead Acid Battery Meter Circuit In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage....
-
The circuit on this page is for a simple light detector circuit board that has 8 detectors that can be used with visible or infrared light systems. The detectors use LM339 voltage comparators as the active element.
Phototransistors or CdS photocells can be....
-
You can download the schematic below. Have a look at it since you will need to match the circuit you are building, to this schematic. It is very like....
-
As you are probably familiar, an accelerometer is a device that can measure dynamic acceleration (vibrations) and static acceleration (gravity). Being that it measures this, it can measure tilts, rotations, and movements/lack-of-movements for alarm system....
-
-
-
Build circuit on a 1" square circuit board. Position the variable resister so that it can be adjusted from one of the edges. Attach the CdS cells at the other end but not at the edge. Drill out two pins next to the center of one of the long sides of a Lego....
-
A sequential timer circuit device are used in many applications for initializing conditions during start-up or for activation of test signals in sequences such in test equipment device. The circuit diagram below shows a sequencer circuit with possible....
-
Color light-emitting diodes with different colors of light can indicate the operating electrical equipment status, electrical equipment status indication line as shown in FIG. ..
-
-
The sensor/monitor shown in the diagram wakes up` the host system on detection of infra-red (IR) signals. It draws so little supply current that it can remain on continuously in a notebook computer or PDA device. Its ultra-low current drain (4 µA maximum, 2.....
-
-
The TNT Convertus has been one of my favorite designs. It was probably one of the first DAC DIY projects published in Italy, and attracted a lot of attention (well, given the size of the market, obviously. ). A few changes have been made to the original....
-
This circuit prevents damage to the load due to incorrect phasing. The three power SSR's are only permitted to turn-on for a phase sequence of phase A leading phase B. If phase A lags phase the input currents will cancel, causing the SCR and the inhibit SSR....
-
This fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is....
-
Ahigh voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by electric charging of....
-
A portion of the op amp`s output signal is rectified by the 1N4148 diodes, then filtered and fed to the gate of the FET input shunting circuit. As the output rises, more and more input shunting takes place. That is, more of the input signal is bypassed,....
-
T amplifier circuit schematic section shown in Figure 3-51 Japan Sanyo STK6303 Pina made high-power thick film integrated circuit, the power supply voltage maximum Dashi sov, output current up to about loA Division monolithic circuit powering Guests 36V,..
-
Infrared reflective burglar alarm, infrared detection using reflective components (maximum detection range of up to 12m) to trigger the alarm, when Pirates of the situation is detected, an alarm will sound realistic barking to alert the owner of..
-
Nice small audio amplifier which use only few parts to give good quality sound. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. Although not perfect, this amplifier does have a wide frequency....
-
-
-
The circuit remains in stable state until a triggering signal is applied to its input. After getting the triggering signal the output transit from stable to Quasi-stable state and return back after a time period. So a Single Pulse isgenerated for single....
-
The circuit uses the exceptionally low input current (O.lpA) of the CA3420 BiMOS op amp. With only a single 10 megohm resistor, the circuit covers the range from ±50 pA maximum to a full-scale sensitivity of ±1.5 pA.
..
-
For simplest functions (flashing indicator and/or beeper) you don`t need a printed circuit board, directly weld onto the legs of the PIC, an end of heat-shrinkable sleeve and that is. Go ahead with softness if you do not want to burn the integrated circuit....
-
As the figure 15-24 shows, the controller circuit is composed of the switch type Hall integrated circuit DN838 and the astable multivibrator (composed of the 555), this circuit can be used in wide range of applications such as the automatic door opening,....
-
-
So, as I finally managed to find an empty projector (the one we love extracting Nichia LD`s out of) (also, thanks, Greg!), I tried to find a driver....
-
Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, engine control with injection calculators, airbag activation, or other various functions, called comfort functions. Among them is one which we tend to....
-
The purpose of this circuit is to power a lamp or other appliance for a given time (30 minutes in this case), and then to turn it off. It is useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep.....
-
-
This is 12V Car Battery Charger simple circuit. This circuit is designed to solve some problems that occurs in most car battery chargers. The problem that occur in most car battery chargers is when the charger is not turned off, the battery will overcharge,....
-
Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
-
Encoder and Decoder are circuits which converts the analog signal to digital and digital signal into analog signal. Its input will be in digital form while the output will be a continuous sine wave or analog wave....
-
This phone is loud ringing tone circuit for generating the electricity bell in the old telephone. This circuit is relatively loud. so can use to replacement the same ringer or the original telephone may be lost. We do not need a new phone. The detect ringing....
-
Before Light-Emitting Diodes (LEDs) and Liquid Crystal Displays (LCDs) the electronic industry used cold-cathode tubes for displaying numbers, symbols and even characters. Even though they are called "tubes" they differ from "radio tubes" by having no heater....
-
-
Current-Driven Sallen Key Filter Circuit Diagram he low-pass Sallen-Key filter is staple for designers because it contains few components (A). By redesigning the filter, ..
-
This be Simple high pass Filter perform filter especial tall frequency can change only. By use IC 741 , be the integrated circuit op-amp very the circuit....
-
Speed regulation is accomplished by sensing the motor current with R17 and using it as positive feedback to compensate for motor resistance loss. The gain pot should be set to a point just below the point where the motor speed oscillates. After finding this....
-
Build a library of circuits and service data for old valve and transistor radios. There are many available on the internet, but at a price. I would rather share my circuits and manuals with others than try to make money out of them. Thanks to all those who....
-
Integrated-circuit U1-an LF351 or 741 op amp-is used as a comparator to control the light. Resistors R2 and R3 provide a reference voltage of about 2.5 volts at pin 3 of U1. When daylight falls on light-dependent resistor LDR1, its resistance is low: about....
-
Circuit shown in Figure 3-177. It uses two single-phase voltage regulator and connected to a V-shaped, single-phase regulators when two concentric series of time-linked slippag..
-
It consists of two LM339 comparator and two CD4070 XOR gate thyristors and other components autotransformer exchange regulator, the circuit also has overvoltage and undervoltage protection. Adjust the potentiometer RPi or change the P position, the control....
-
The design shown is a simple unit for QRP operation on all authorized frequencies up to 30 MHz. based on a toroidal transformer Tl. The secondary winding of Tl samples a small amount o1 rf power. both forward and reflected, which is divided by the bridge....
-
-
This simple AVR Programmer will allow you to transfer hex programs to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very short....
-
As shown in FIG display circuit for the tape direction. The rectangular pulse generator circuit, D flip-flop (T077), the decoding circuit, the light emitting diode LED1 ~ LED4 ..
-
The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used over the frequency range of 450 MHz to 2000 MHz and requ....
-
for example i dont get the way the demodulation is done or the modulation itself an so on please is someone able to understand this circuit could you give me a hand..
-
Using the LM3410 constant current LED driver is a monolithic IC we can design, many high efficiency and low cost lights, using just few electronic components. The LM3410 utilizes current-mode control and internal compensation to provide high-performance over....
-
There are only four components required, and the cost for these is around 70p, so it would be a good candidate for a classroom exercise. Even a cheap relay like the Omron G5LA-1 5DC can switch loads of 10A at 240V. A word of caution: don`t tinker with mains....
-
The signal output by the radio control receiver is a form of PWM. This may be useful for driving servos, but is inconvenient for general electronic applications. Therefore, several of the circuits on this site convert this signal into a voltage first. This....
-
The power supply section is the important one. It should deliver constant output regulated power supply for successful working of the project. A 0-12V/500 mA transformer is used for this purpose. The primary of this transformer is connected in to main supply....
-
The circuit is aimed to create a monitoring and surveillance scheme for a remote location to function as a room monitor or baby alarm with the use of an a...
-
This tester can be used to check IC printed circuit boards. Two 4 K resistors and the transistors connected to them prevent current flow through the operational amplifier until the probe circuit is completed..
-
The very simple circuit uses only two CD4001 packages, i.e., eight NOR gates and operates in the following way: Pulse streams are fed to an RS flip flop generating an output waveform wliich has a small or large duty cycle depending on the direction of....
-
Deep discharge can damage a rechargeable battery. By disconnecting the battery from its load, this circuit halts battery discharge at a predetermined level of declining terminal voltage. Transistor Ql acts as the switch...
-
-
The new design of a tutorial board based on the popular PIC16F84A microcontroller. Have a features eight single leds, an LCD display and five push ...
-
Hand and body motions in proximity to the sensing antennas produce frequency changes in a Hartley oscillator operating at approximately 750kHz. The signal from this variable oscillator is mixed with a constant reference frequency in a ring modulator and the....
-
Using TDA7262 integrated circuit manufactured by ST Microelectronics can be designed a very simple stereo audio amplifier electronic project which can provide a maximum output power of 20 watts per channel. TDA7262 is an ( class AB ) dual Hi-Fi Audio power....
-
There is one important low-impedance node in the whole circuit. That`s the frame and the cross in the middle. Let`s call that 0v. The top voltage source is connected to the middle via that 1k resistor, that means the lower voltage source has priority. the....
-
A very simple encoder circuit for a dc motor can be constructed using this circuit diagram. As you can see in the circuit diagram, the system shown consists of the HA-2542, a small 12-Vdc motor, and a position encoder. During operation, the encoder causes a....
-
The ATA5760 ATA5761 is a multi-chip PLL receiver device supplied in an SO20 pack- age. It has been especially developed for the demands of RF low-cost data transmission systems with data rates from 1 kBaud to 10 kBaud in Manchester or Bi-phase code. The....
-
Having good contacts is important not only in your daily life, but also in electronics. In contrast to social contacts, the reliability of electrical co....
-
The gain control element is a Light Dependent Resistor (LDR). These are blessed with a few very useful features for our purposes, one of which is low distortion even at quite high signal levels. Being light activated, all we need is a LED to provide....
-
TMP01 is a temperature sensor that comes with a programmable temperature controller, primarily integrated reference voltage source, a current..
-
-
Microphone problem on Nokia 6630 usually caused by several reason, damaged microphone, broken path or line, and damaged the UEM IC. If the problem caused by the broken path in the microphone circuit, we need the Nokia 6630 schematic diagram to find the....
-
A simple USB FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio by connecting it to an USB port. The circuit use no coils that have to be wound. This USB transmitter can be used to listen to your....
-
After some more time with the circuit, the variable pot certainly brings in more useful results than I expected. Had linked draw to pot position and LED brightness, but not to transistor on-time. It should be obvious and now is, after reading your p..
-
Switch mode circuits can implement the lead acid battery charger with a more efficient. It can be constructed using bq24105 battery charger controller. The....
-
Electronic filter The effect of the capacitor c5 is filtered. Cs fact constitute a composite pipe with an electronic filter, as shown in FIG. Thus the advantage law by using sm..
-
The following circuit is a cheap completely transistorised inverter circuit ideal for driving medium loads with the order of 40 to 60 watts working with battery of 12V, 15 Ah or larger power capacity. Transistors T1 and T2 (BC548) make a 50Hz multivibrator.....
-
As shown for the ISO103 ripple reduction circuit. Circuit at the output plus an RC high-pass filter for filtering output ripple bang, without affecting the current (DC) feature..
-
Sine-wave generator produces Walsh-function approximation of sine function. Frequency of sine wave is set by square-wave input to pin 14 of 7493. Filter com ponents of opamp help smooth staircase wave form generated by summing Walsh-function components as....
-
This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,....
-
-
This is a simple update to Mr. Hareendran`s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3. 3V. While this may function with some 5V relays, it will not function with all. The nature of an emitter follower....
-
-
To build a GaAs FET preamp that has good gain and extremely low noise from readily available components. This preamp is stable with differing source and load situations. The circuit is built dead bug style on a piece of printed circuit board for a good....
-
Use this circuit to keep the fluid level of a liquid between two fixed points. Two modes, for filling or emptying are possible by simple reversing the contact connections of Kl. The loads can be either electric motors or solenoid operated valves, operating....
-
I forced myself to use and learn about programmable logic chips. As I wrote in my older post, I have very small inventory of the chips and was forced to use Lattice isp2032VE110LT144 chip. I received great help reading article from Seattle Robotics Society....
-
CPU NatSemi Geode 200/233/266/300 MHz (default 233 on-board) or and follow Geode link. VGA/LCD Interface NS GX5530, shared memory 2. 5MB, support CRT display and 18-bit TFT LCD, resolution up to 1024x768 @64K colors, with VGA and 50-pin LCD connectors Given....
-
The light of flashlight aims at phototube, then CMOS logic circuit which adopts battery as power supply will occur switch action to turn on/off the motor of model train or other electric toys. To most small motor, the transistor can use 2N2222A; but the....
-
The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance.
The mixer is formed assembling three main modules that can be varied in number and/or disposition to suit everyone needs...
-
In this fast-paced world, there is little time for inconveniences and a greater need for portability and adaptability. The idea for an Audio/Video transmitter stems from this need. There may have been times when you`ve wanted to hook up your VCR from one....
-
The timer interval starts when power is applied to circuit and terminates when voltage is applied to load. 2N2646 is used in oscillator which pulses base 2 of D5K..
-
I use a RealTimeClock Maxim DS1305. The RTC backup power is a supercapacitor (0,22F). I test it for 4 weeks, works fine. For this reason it don't have the capability to change the time, but you can do small-corrections. Once you push the button, the seconds....
-
Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact,....
-
A fairly simple "divide-by-1000" circuit which was first designed by Zeljko Bozic, S52ZB, in a 2006 issue of VHF Communications Magazine. The idea of this project is to extend the range of older (and cheaper) frequency counters. You can often find 100 MHz....
-
The shown three-phase application circuit owns motor controller circuit connection diagram which is driven by full wave six-step.The power switch triode is Darlington PNP type and the lower power switch triode is N groove power MOSFET. Each device contains a....
-
-
As readers will know, there are already several power amplifier projects, two using IC power amps (aka power opamps). Both have been popular, and this project is not designed to replace either of them. However, it is significantly smaller than the others, so....
-
The way that this circuit works is as follows. The AC line voltage is rectified by D1 and D2 which connects to a voltage doubler circuit made up of the two 22uf capacitors. The Flash Freq. Pot and the 10uf capacitor charge up which triggers the Diac and....
-
This is a aerial achievement low babble 500mW amplifier / booster for all low ability FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier dent is an chip ambit absolute assorted transistor stages and all added....
-
Transistor Ql remains off until the magnetic switch connected to Jl closes. When that happens, the 9 Vis connected through Rl to Ql"S base. Ql turns on, thereby charging C2 through relay Kl, which causes Kl "s contacts to close. Since the contacts connect....
-
Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage....
-
Based on CD4017 and logic gates this electronic circuit switches on a relay if you press four keys in the correct sequence, and backs to the start conditio....
-
This circuit will power up a water pump when the water reaches a predetermined level. Then it turns itself off when the..