Popular Circuits Page 66
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This light sensor switch circuit allows the automatic connection of a lamp when the light is low (at nightfall) and will maintain the lamp ON for a certain period of time. From the moment that T4 and T5 are opened, relay`s LED start to light and powers the....
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This is a 2 MHz crystal circuit using CMOS pair. This circuit is ideal for uses in digital watches and clock because this circuit has low power drain. The....
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The sunset lamp comes on at full brightness and then slowly fades out over 1.5 hours time and stays off until power is recycled...
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Nowadays it has become necessary to own a car battery charger at home. By keeping one at home, we can avoid car starting trouble due to battery complaints. Buying one battery charger will cost you huge amounts while the components used in the car battery....
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Aim of this project is to present a way to store a large quantity of data into microSD card in files with FAT32 format. Here, ATmega32 is used for data collection and microSD interface. The data is received from in-build 8-channel ADC of ATmega32. One....
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This receptor is born of our annoyance against the irritating problem of Quartz: With the RX21, completed research of cut crystal for your personal rating, you have with him, access to ALL band frequencies, in steps of 5 kHz ! Desiring to make this universal....
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A very simple high efficiency switching mode buckboost power supply circuit can be designed using the LTM4609 switching regulator IC. This switching power supply circuit will provide an fixed output voltage of 12 volt. As you can see in the schematic....
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This electronic organ circuit is very simple to construct and is basically an emitter-coupled oscillator composed of T2 and T3. An squarewave voltage can be sampled from the collector of T3 (X2). This signal gives a clarinet character to the tone. An....
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The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five meters or so, the light is usually not powerful enough to take a satisfactory picture. Unfortunately most such cameras do not include a....
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The simplest one transistor audio mixer circuit diagram on the net. It has only one transistor and can support as many audio signal as you can afford. BC10....
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This circuit was developed since a number of visitors of this website requested a timer capable of emitting a beep after one, two, three minutes and so on, for jogging purposes.
As shown in the Circuit diagram, SW1 is a 1 pole 9 ways Rotary Switch. Setting....
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It shows an FM modulator of a strong, weak signal switching circuit. The circuit ring 3-14 (a) shown in mechanical switches, one for the workers selector switch to choose based on the signal strength. Figure 3-14 (b) shows the use of diode switching control...
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This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body. ) Input coil L1....
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This is the circuit diagram of lamp flasher operated from mains. By this you can flash up to 200 Watt lamps at rates determined by you. IC NE555 is wired as an astable multivibrator for producing the pulses for flashing the lamp. The flashing rate can be set....
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This two transistor AM radio circuit is also called ""mini-radio"". It uses only 2 transistors and few passive components which makes is very easy to be cons....
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As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
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CMOS and PMOS cross interface circuit b PMOS integrated circuit high input impedance, input current can be ignored. CMOS and PMOS interface circuit shown in Figure ..
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Chapter The Gruner Schematic of Philip Hoyland`s Beam Ray Laboratory Rife Machine, There is another feature that the Beam Ray Laboratory Rife Machine had....
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In the video system of Figs. A and R, a single coaxial cable carries power to the remote location, selects one of eight video channels, and returns the selected signal. The system can choose one of several remote surveillance-camera signals, for example, and....
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circuit multiprogs 1 BOS tx con 0 `pin serial to BOS processor 0 BOSrx con 1 `pin serial from BOS processor 4 epower con 2 `pin high turns on power to electronics 2 BOShalt con 3 `pin high halts current BOS move 3 BOSbusy var in4 `pin BOS processor busy =>....
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This circuit reads and stores voltages, tbus freezing the meter reading even after tbe probes are removed. The op amp is configured as a unitygain voltage follower, witb C1 situated at tbe input to store tbe voltage. For better performance, use an....
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The following article discusses a few very simple intrusion detector circuits, or simply burglar alarm circuits. The presented designs are simple yet extremely effective with the functions. The triggering stage may consist of a voltage/current amplifier....
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*Useful circuit for self-powered speakers, Radios, TV, can be used as car power *amplifier Here is the schematic for an 8 watt audio power amplifier. This....
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Reaction Capability Tester is used to test and train man s quick-response capability. It has various type of construction and the Reaction Capability Tester as shown in the picture is composed of decimal counter CD4017 and luminous diode. The construction of....
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This circuit is a static SCR switch for use in a dc circuit. When a low power signal is applied to the gate of SCR1, this SCR is triggered and voltage is applied to the load. The right hand plate of C charges positively with respect to the left hand plate....
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This simple circuit is the electronic version of the combination lock. Using the special purpose LS7220 digital lock IC, the circuit allows a 4 digit combination of your choice to activate a relay for a set period of time. This relay can then be used to....
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This electronic circuit is a video signal amplifier that offers a broad band amplifier with a bandwidth of 5 MHz which will take the video signals from your VCR and will amplify them sufficiently to drive up to 3 monitors, TV sets (provided that they can....
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This circuit is IC controlled emergency light. This series of automatic switching-on of the sunshine on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery offer to the....
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Each of these ways have their own advantages and disadvantages. The multiple transformer way is easy to start small and work up to only as many power supplies as you need. It does, however, get more expensive as the number of supply outputs goes up. Suitable....
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This converter delivers up to 50 mA from a 6-V battery with 78% efficiency. This flyback converter functions by feedback-controlling the frequency of inductive flyback events. The inductor"s output, rectified and filtered to de, biases the feedback loop to....
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This provides bidirectional speed regulation for small motors and requires no tachometer. The voltage th..
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AC by VDI ~ VD4 full-wave bridge rectifier output pulsating DC power for four lights. Rl, R2, VD5 simple composition and VD6 regulator circuit, Cl filtered output by about 6V D..
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This is a simple form circuit for a 2-station intercom using common 8R mini speakers. The press-to-talk switches should have a spring-return so the intercom can never be left ON. This is the figure of the circuit; Power the speaker from a separate power....
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This is anti theft alarm with wireless connectivity, called Anti Theft Car wireless alarm The FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at....
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I found this circuit in my files. I don`t know where it came from, but it looks like I photocopied it from somewhere years ago. I have been told that it came from "The Robot Builder`s Bonanza", by Gordan McComb. Anyway, I thought that it should be fairly....
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With the integrated audio TDA8571J designed for automotive applications, this circuit can expand the sound of the car radio or connect a portable MP3 playerin it. Internally, thechiphas eightoperationalamplifierseton the bridge, allowingeachspeaker....
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This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and few numbers of parts....
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If you want to be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89.5 to 108 MHz ? but building such an oscillator using discrete components is not that easy. Maxim now....
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Incandescent is a two-wire connection Life Extension open curse, i A warm-up time than its H K, so scorpionfish life bubble E is quite pregnant. After closing the Ji Guan S, 220V AC only negative 3F week by VD1,..
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For the best advantage as a low noise high input impedance device, the preamp and tone control uses JFET. If the circuit reaches harmonic distortion levels of...
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The current source formed by Ql in conjunction with capacitor Cl set the duration time of the ramp. As the positive dc voltage at the gate is changed, the peak point firing voltage of the PUT is changed, which changes the duration time...
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Nothing really new: a JFET is used to sense the electric field generated by high voltage electric line; the JFET amplifies the signal very little, but it lowers the impedence and provide current to a level suitable for transistor amplification. The two....
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In few previous post, I showed schematic for interfacing Keypad and LCD using 8051 architecture. This blog post shows complete implementation of the interface using AT89S51 Micro-controller with programming in assembly. Considering that one understands the....
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A actual simple metal detector cyberbanking activity can be advised application a simple 555 timer chip ambit. As you can see in the schematic ambit, this cyberbanking activity requires few alien cyberbanking genitalia. ..
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Energy Leak Sensor Detector Circuit Diagram. Features: Thermistor value can be chosen in the 10K - 22K @ 20°C range, fast detection of ....
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This circuit provides a short circuit protected power supply from PC 12V supply voltage. This is particularly handy when working with PC interfacing projects...
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In the forward inverter system applications: IRZ110 for receiving such a line when the line shown in Figure 12-39, in this application, the next channel on the channel IR 2110 and shared an input into the pulse signal, which determines..
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Long range FM transmitter. The power output of most of these circuits are very low because no power amplifier stages were incorporated. The transmitter circuit described here has an...
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It`s always a bit difficult to measure the current in the positive lead of a power supply, such as a battery charger. Fortunately, special ICs have been developed for this purpose in the last few years, such as the Burr-Brown INA138 and INA168. These ICs....
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Certain part of this circuit is directly connected to AC mains. Therefore, do not touch whilst in operation. Disclaimer Please take the greatest of care in handling AC mains supply while constructing this project. If you have no knowledge of mains wiring or....
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Switch mode circuits can implement the lead acid battery charger with a more efficient. It can be constructed using bq24105 battery charger controller. The bq24105 was originally designed to charge single-, two- or three-cell Li-polymer and Li-ion battery....
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Connect Relay with pic microcontroller and whenever I put Load on Relay`s Contacts PIC16f877a resets. I some time solve this problem by triggering another relay from basic relay attached to PIC. But this is not a solution. Can any one describes Why pic is....
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741 op amp can be used as a voltage comparator. Non-inverting input and a zener control source. The reference voltage is 5.1V. R2 can adjust the in-phase input voltage becomes ..
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Want to make some stuff that fits your car or motor cycle Then here is a simple musical horn circuit that can be connected to the 12V battery of any car or motorcycle. This circuit commonly used as reverse musical horn. Here we use a commercially very low....
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The LM231 LM331 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for Analog-to-digital conversion, precision frequency-to-voltage conversion, long-term integration, linear frequency modulation or demodulation,....
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Remote sensor sends data via mains supply, Temperature range: 00.0 to 99.9 °C This circuit is intended for precision centigrade temperature measurement, w....
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The entire remote control is handled by a PIC that controls the GSM/GPRS module`s activity, reads the room temperature through a Dallas DS1820 smart probe, controls the logical state of two opto-isolated inputs, and gives commands to the two relays. In....
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S/PDIF is an acronym for Sony /Philips Digital Interface (or Sony /Philips Digital Interconnect Format). The full specification for the S/PDIF interface consists of hardware and software, but only the hardware side will be discussed here - the software is....
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Before you use LEDs, it`s a good idea to check them out. With a LED tester, you can even do it in the dark! LEDs are available nowadays in all shapes and colors. There are types with clear, colorless packages, while others have colored plastic packages. Many....
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The original smoke alarm circuit has some problems and has left some hobbyists and students disappointed. Rather than to attempt to solve its many problems, I have created an update that uses the venerable LM741 op amp. It is simpler, more conventional,....
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The best way to measure the current in a circuit is to place a sense resistor in the current path. The higher the resistance, the more exact the measurement will be. However, the drawback of a high resistance is that it affects the operation of the circuit....
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Signal conditioning is a set of operations performed on a signal that makes it suitable for interfacing with other devices or systems. Signal conditioners are the actual devices that perform this operation. These devices have an input and an output. Normally....
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You can easily build a barebones Arduino yourself. This project shows a breadboarded Arduino without an FTDI chip. This means no USB connectivity (this could be however accomplished using a USB-Serial breakout board). Use an ATMEGA168, a 1k resistor, a....
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The dark detector circuit shown here can be used to produce an audible alarm when the light inside a room goes OFF. The circuit is build around timer IC NE555. A general purpose LDR is used for sensing the light. When proper light is falling on the LDR its....
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One day I bought an old pong console from an old lady at a flea market. When I got back at home I hooked it up to the TV But the problem was that I didn`t have the AC adapter for it So I took C batteries to insert them in the console but when I removed the....
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This circuit will be particularly useful to those hobbyists who use a breadboard` to try out ideas and who also use a simple home-made` DC power supply consisting of a transformer, rectifier, smoothing capacitor and protective fuse, that is, one without over....
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Simple modifications I`ve done on these rigs, to overcome some common shortcomings. Not all kits need these mods, but many do. Some overcomeminor inconveniences, and some potentially serious problems. If you have built one of these kits before, and....
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PC based candle ignitor is a pc based verified project for computer student using 555 lighting candle using computer circuit diagram with software code in C ...
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As shown by 555 and the timing resistor R1 ~ R3 and measured capacitance Cx can be composed pointer capacitance meter, one-shot circuit capacitance measurement principle is the..
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In this self-explanatory schematic you can see decoupling capacitor on the right, which must be as close to microcontroller`s power pins as possible; crystal oscillator, which is optional, because you can use internal RC oscillator or external clock signal,....
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Given favourable radio wave propagation, the shortwave and radio amateur band are chock-a-block with SSB (single-sideband) transmissions, which no matter what language they`re in, will fail to produce intelligible speech on an AM radio. SSB is transmitted....
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This small FM transmitter with a range of about 50 meters designed for hoby. With lots of mini-transmitters then you have a comprehensive, action-packed radio program. Due to the power supply via the USB port of a high frequency stability is achieved.....
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IC2 forms a stable oscillator whose frequency and pulse width is determined by the values of R4, R5, R6, and C4. R4 is made adjustable for precise frequency setting. The output of IC2 is pin 3, which is capacitively coupled to the base of Ql. Ll acts as a....
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When designing bass reflex loudspeaker cabinets, it is necessary to measure the resonance of the speaker to an accuracy of about 1%. To do this, you need an audio oscillator and a frequency counter. However, the typical accuracy and resolution of a frequency....
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USB flash drives provide a handy way to store any type of information in a small package. The drives, also known as thumb drives and USB keys, seem ideal for use in data loggers and other microcontroller-based projects. But to access files in a flash drive,....
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This is a very useful project for anyone working in electronics. It is a versatile power supply that will solve most of the supply problems arising in the everyday work of any electronics work shop. It covers a wide range of voltages being continuously....
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How many speaker attach with this amplifier and what is the what is the speaker Ohom and watt valu of this speaker plz ans me my email Sir, you made this amp and reallly properlly works this amp to used life time. Which transfarmer used for 2 channals .....
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The following circuit shows about LM4652 IC For 170 Watt Power Amplifier Circuit. Features:?used in portable HiFi systems such as power ....
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The LT®1510 current mode PWM battery charger is the
simplest, most efficient solution for fast charging modern
rechargeable batteries including lithium-ion (Li-Ion), nickelmetal-
hydride (NiMH) and nickel-cadmium (NiCd) that
require constant current....
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This light sensor circuit that is photos sensor is the gap between light and electronics. This circuit is built by op amp and microcontroller PIC16C63 for control the sensor. This circuit is not precision application, but they can be effectively used in....
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As shown, the circuit is canceled due to an external transistor becomes simplified. The connection between both original external transistor emitter feet and legs a 3.3k resist..
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The total gain of the car antenna amplifier is around 30 dB and the input impedance at 30 Mhz is around 10 K ©. The amplifier must be mounted directly at the base of the antenna to avoid signal losses caused by the capacitive character of the coaxial cable.....
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The timing cycle is continuously reset by the input pulse train. A change in frequency, or a missing pulse, allows completion of the timing cycle which causes a change in the output level. For this application, the time delay should be set to be slightly....
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Detects the presence of a live mains conductor.
Minimum parts counting. If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the....
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This is a slight modification of that circuit. In the previous circuit you have to keep the switch pressed for making the IC play the full music. Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music....
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Light-emitting diodes connected with reverse polarity provide a visual indication of zero-beat frequency. Each LED is on for only half a cycle of the input. When the input frequency is more than 1 kilohertz away from the zero-beat frequency, both LEDs appear....
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Analyze your circuits before you build them!
PC-ECAP has been one of the world`s best linear circuit analysis programs. The software will calculate and plot: gain, phase, group delay, impedance, VSWR and return loss. This versatile program can also....
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Described here is a very inexpensive solution to many phono-controlled applications like remote switching on, for instance, or activating a camera, tape recorder, burglar alarms, toys, etc. The circuit given here employs a condenser microphone as the....
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This circuit was designed to make switching of a 48-channel mobile transceiver safe to operate while mobile. The oscillators allow for single-stepping or a scanning function. The scan facility allows for stepping through all 48 channels to check for....
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Connected 0. 1uf cap and 500uf electrolytic cap to transmitter and the same to receiver. The result was it still does not work. I tried to add just diodes but it did not help either. when u say it doesent work-what is happening when the ir is recieved by the....