Popular Circuits Page 240
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Here is a project of a 555 touch alarm circuit with UM66 melody IC. The circuit will produce a melodious alarm sound for a set time period when someone touches the metal plate / touch plate shown in the schematic....
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A community dedicated to helping everyone learn the art of audio. Projects by fanatics, for fanatics!....
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First you will have to use a opamp like ne5532, than calculate the frequency you want on each block(on block for flat, one for bass and one for high), don`t forget to put a buffer on the first stage, you can use trimpots or fixed resistor and some bottons to....
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Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are both high and low level outputs which may be adjusted with the level control. This project makes a....
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Everything is working with simple passive mosfet drive. But if we increase switching frequency or place powerful mosfet (or even several mosfets) There is no load in gate circuit, but there is gate capacitance. And if we need fast switching we must charge....
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When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer is at the....
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An operational amplifier can be used as a convenient device for analog comparator applications that require two different trip points. The addition of a positiverfeedback network introduces a precise variable hysteresis into the usual comparator switching....
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In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor. Energy is stored in the inductor while the transistor is on, and released into the load circuit when the....
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Personal Safes are revolutionary locking storage cases that open with just the touch of your finger. These products are designed as "access denial" secure storage for medications, jewelry, weapons, documents, and other valuable or potentially harmful items.....
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AH1751 is a single-digital-output Hall-effect Sensor for high temperature operation. The device includes an on-chip Hall voltage generator for magnetic sensing, an Amplifier to amplify Hall voltage, and a Comparator to provide switching hysteresis for noise....
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This circuit is maintain a constant voltage, the output voltage is adjustable. Serves to reduce the input voltage, and keep the voltage constant. The Q1 2N3904 is the amplifier model. common-emitter. This causes the voltage across the collector`s pin with....
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The p-Wave Locked Loop provides instantaneously the p to p time interval of the applied ECG and enables us to perform heart rate variability studies on the basis of p_p variation. The first version of the PWLL started its processing action with the....
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A very high quality intercom, which may also be used for room monitoring..
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Details the AT Keyboard Interface and AT Keyboard Protocols. Includes an example Keyboard to ASCII decoder using a 68HC705J1A MCU....
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The metal detector circuit consists of the fixed frequency oscillator, mixer, detector, detection oscillator and power amplifier circuit, and the circuit is shown as the chart. Fixed frequency oscillator circuit consists of ceramic filter ZC, transistor VI....
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If you want to drill a hole in the wall then you must be sure that there`s no electrical wiring. This simple device. shown on the figure 1, can detect electrical wiring in the walls or ceiling. Resistor R1 protects IC CD4011 against electrostatic. A rigid....
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The output of the detector contains a term related to the cosine of the phase angle. Two signals of equal frequency are applied to the inputs. The frequencies are multiplied together, producing the sum and difference frequencies. Equal frequencies cause....
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The telephone ring generator shown generates the bare aerial voltage from a simple switching approach ability accumulation (SMPS) which employs a CMOS Schmitt Trigger aboveboard beachcomber oscillator, 10 mH inductor, aerial voltage switching transistor....
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Read and write the raw data from an SD card using just a computer (no microprocessor) forgetting the FAT32. I would like to do this in basic C. I can look at the raw data with a program called winhex. Long run I want someone who is less computer savvy to run....
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Two examples of the most common types of Voltage followers (buffers). You can find some theory behind them in our amplifier gain and buffer amplifier pages.his first circuit is a very simple one transistor voltage follower. Consist of two biasing resistors,....
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This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3....
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Friends that seek 5V 10A power supply circuit small-sized and build easy. I begs for to advise this circuit. It is 10A switching regulator by use IC L4970A. Then build easy as an example integrated readymade circuit. Important point be power supply input....
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Figure 2-80 with the SH-868 is an integrated circuit made music flash circuit, which uses three battery power supply. Can drive flashing light emitting tube, while electronic m..
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This circuit has been very useful in filling a header tank for a reticulated water supply on a farm. Eight troughs are supplied in different paddocks where a lack of water would have serious consequences for the stock. In the past, the tank had been filled....
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Transistor and diode tester in this website is specially design for testing all kind of transistor .using diode principle diode can also be checked.various type of testing circuit you found here ...
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This project is intended to support a simple course in which a student builds a simple AVR/Arduino based badge - a beginner`s soldering project producing a simple object with blinky lights that can be hung around the neck from a lanyard or pinned to a jacket....
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This post provides the implementation of free running counter ( using c language ) for PIC16F84A micro-controller. This code is written in such a way that,....
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Here is a project of a simple automatic night lamp circuit or dark activated 230V lamp circuit, which will automatically activate an AC lamp / bulb when sun set or if the circuit will receive no light. The circuit is very easy to build using no more than....
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A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful in many applications in which some sort of time-delay counting in seconds is desirable. The circuit is formed by a CMos 4024 counter/divider chip and 3....
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The circuit used for this project is really straight forward. Many would likely criticize me that I didn`t use decoupling capacitors for the LM7805 vo....
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Controlled rectifiers are line commutated ac to dc power converters which are used to convert a fixed voltage, fixed frequency ac power supply into variable dc output voltage. The input supply fed to a controlled rectifier is ac supply at a fixed rms voltage....
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Provides remote control for ac-powered devices by using the beam of a flashlight as a magic wand. The important aspect of this gadget is that it remembers. Activate it once to apply power to a device and it stays on. Activate it a second time and power goes....
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I am not an engineer, just an experimenter and hacker and prototyper etc, so, thanks to people who know a lot more than I do, I learned that this is not safe to use NOTE: This can only be used to dim a unit that runs off of a transformer-based power supply,....
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Here is the circuit diagram of the simple FM transmitter using a transistor. Great performance or range is not guaranteed here, because this is an elementary design. General purpose radio frequency transistor BF 494 (Q1) is used here for obtaining FM....
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Figure 1 is an improved trigger timing circuit composed of 2 PUT. If you add the set signal, the circuit will be set, transistor VT1 turn to the conduction state, the relay K will be energized action. It supplies voltage for the delay voltage at the same....
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Adjustment potentiometer RP, can change the pulse phase shift range. The phase shift circuit is in the range of 0. -1600 Higher sensitivity. ..
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The LM1830 fluid level detector circuit is a device intended to signal the presence or absence of aqueous solutions, featuring low external parts count, wide supply operating range, internally regulated supply and AC or DC output. In a typical application....
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F9500 is the power supply in the United amplifier circuit preamplifier. The power supply using LM7824 and LM7924 composition 42V servo regulator power supply, Huang NE5532 op a..
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As shown in FIG touch sensor switch circuit diagram The circuit consists of step-down rectifier circuit 555 and flip-flops. When the hand touches the metal sheet A, sensor sign..
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THE CUBE is a 3D jigsaw puzzle, with the added feature that a puzzle piece vibrates for approximately a second when it is placed in the correct place in the puzzle. We accomplished this by building an electrical design such that a circuit delivering power to....
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Below is a comparator circuit which is can measure with step of 1 volt, the voltage of car battery. The indication of voltage is done by comparison of? ...
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A clock-and-data recovery (CDR) circuit is used to both recover the clock from a transmitted data stream and re-time that data with the recovered clock. Such circuits are typically placed at the front-end of receiver chips to recover the clock from data sent....
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This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals. The circuit is shown below...
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Does does it forget to be erased the small lamp and the headlight of the car, the battery go up, and is there what to the engine has not started once and twice everyone I am using it for a long time since then thinking about the circuit that prevents this in....
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The simplest way to bias a transistor amplifier is by the fixed-bias circuit. The supply voltage is connected to the transistor`s base terminal trough the R1 current limiting resistor. The value of the bias resistor is usually selected based on the....
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This program includes circuit design cad, simulation, and auto routing PC layout. I also use PSPICE at Unisys which has more capabilities but costs 6 times as much and needs to be renewed yearly. With these requirements in mind, and some others, I decided on....
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The simplicity of this transmitter compared to its very high performance makes it very interesting. Its output power is about 30 W and its range under normal conditions, with proper antenna and handling, reaches 30 km. The oscillator is the PL 84 which....
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This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR. Timing is provided by R1, R2 & C1. To change flashing frequency....
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This simple home emergency lights uses very few components yet is able to produce a reasonable amount of light. The components used are very common and can be easily procured from the local electronic retailer. This oscillations forces an AC in the secondary....
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Electronics Tutorial about the Passive Band Pass Filter Circuit, including Passive RC Band Pass Filter First Order Frequency Response and Bode Plot....
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The timer is proposed an effective model for controlling an external load 8A/380V. Equipped with a 68HC11 mu.P associated with an 8 MHz crystal, it can get very precise programmable durations. Two lines are planned: from 0 to 99 seconds and from 0 to 99....
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Tube Distortion Pedal circuit diagram. IC1 : 747 dual op-amp, other ICs may be substitued but pinout will different. You should check the datasheet. IC2 : LM340K-12V Voltage Regulator. All resistors are 1/2 W. Bridge Rectifier Full wave bridge recitifier, 50....
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With the increase of the modern electrical equipment kind for vehicle, the increase of the power level, there are more and more patterns of power needed, including AC supply and direct current power supply. The power needs to adopt the switch converter the....
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This post answers the question, ""How to capture a pulse to generate an interrupt in PIC16F877"" ? Also, using PIC16 simulator (Proteus) you can verify this....
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The LT3495/LT3495B/LT3495-1/LT3495B-1 are low noise boost converters with integrated power switch, feedback resistor and output disconnect circuitry. The parts control power delivery by varying both the peak inductor current and switch off-time. This novel*....
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This circuit controls a small, four-phase, five-wire, unipolar stepper motor, commonly designated the "KP4M4-001. " This type of motor was used in many 5 1/4" floppy disk drives in older computers. Now obsolete, such disk drives are often available on the....
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Driving a bare LCD does not necessarily require specialized interface circuitry or peripherals. This Design Idea describes an alternative drive scheme, which you can easily implement using the general-purpose outputs of a microcontroller. Many....
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This project is a construction of a VHF-UHF linear amplifier that can work at frequencies from 47MHz to 740MHz. It can be used as a final output stage of any transmitter working between these frequencies. It use the BFQ34 NPN a 4GHz wide-band transistor with....
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As shown, when the output current exceeds 40mA when, XTR110 internal 50 resistor (R9) on the need to use an external resistor REXT instead, REXT connected between 13 feet and 1..
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A simple 5 Volt regulated PSU featuring overvoltage protection. The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be v....
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Here is the circuit diagram of a low voltage /low power DC motor speed controller based on the IC TDA 7274 from ST Microelectronics. The IC TDA 7274 is a monolithic integrated DC motor speed controller intended for low voltage/ low power applications. Built....
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This circuit uses an MC1373 to form a TV video modulator. The coil and capacitor connected between pins 1 and 2 should be selected to have a parallel resonance at the carrier frequency of the desired TV channel...
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This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don`t need to build or wind any coils or transformers. This is a cheap-and-dirty experimenter`s circuit. I tested this and it worked for me, but I disclaim all warranties!....
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This circuit generates a symmetrical, 10-m V pk-pk triangle waveform which is summed with a de level and connected to the aid analog input for noise/DNL testing. The de level input offsets the triangle waveform over the input range of the ADC. ..
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This little aid was originally designed to test the Shutter Time Meter. This meter was specifically designed for analogue` SLR cameras. In order to measure the exposure time of a camera accurately, it will first have to be checked with a well-defined signal....
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The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the Mark 1 circuit and has increased range...
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On many cars, the boot light will not go out until the lid is properly closed. It is all too easy when unloading the car, to leave the lid ajar. If you are unlucky and the car remains unused for some time, the next time you try to start it, the lamp will....
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Let`s construct a low-power FM transmitter using surface-mount devices (SMD) that will be received with a standard FM radio. Soldering surface mounted devi....
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The circuit is based on IC1, which is a 555 timer IC in astable mode. It will power a 6 inch 4 Watt fluorescent tube off a 12 volt supply, consuming 300 mA. It may also be powered by a suitably rated universal AC/DC adapter. Advantages of the design are:....
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Water Tank Level Indicator Circuit Diagram Simple, two-wire, remote monitoring unit,Three-LED level display, 9V battery powered Circuit....
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Had bought this EDE702 some time ago, and a LED-backlit LCD character display. After buying the EDE702, I considered that it did not provide enough integration with HD44780-compatible displays to justify its price. Nevertheless I should use it, as it would....
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Current-limit switches are virtually ubiquitous in system controls. They provide a safe means for regulating the current delivered to a load circuit. The switches allow the load current to increase to a programmed limit but no higher. This application note....
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This tutorial shows concepts for make a lamp withdual actuation. Through aparallelswitchor by relay controlled with RF Module (based on protocol of ZigBee- IEEE 802. 15. 4). The circuit one is a receiver. This circuit controls the load and have a Relay....
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A step by step guide about how ATX power supply works with an example of a 200 Watt PC Power Supply function....
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This design synthesis has considered the survey accuracy of the frequency and measured the requirement of response time. For example it is 3 significant digits to look on the measuring result of the frequency as, require, at this moment if the frequency of....
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First and foremost, if you are not handy with tools and electrical systems, please. hire an electrician instead of trying to undertake this task yourself. And have the electrician read this page for specific cautions and advice. I offer this advice because a....
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Crystals with higher frequencies than about 30 MHz are almost exclusively overtone crystals. Such a crystal is intended to be used on an odd multiple of it`s fundamental frequency. Unfortunately, the crystal doesn`t want to resonate on it`s overtone....
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The logical first choice was to start out with simple regenerative circuits. Just one or two transistors and maybe a simple audio amplifier using one integrated circuit. I already have a few simple tube radios that I bought at flea markets, so I will defer....
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This electronic motor-speed control circuit is designed to operate in an electrically noisy environment. The circuit includes an optoelectronic pickup device. whichis placed inside the motor housing to provide a speed feedback signal. The circuit....
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Family karaoke 0K lighting design of a variety of methods to control circuit, the control circuit described here is a kind of four-way light output, loop jump, speed controllab..
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This is design circuit of tone control circuit that is use very popular Baxandall configuration, a simple circuit configuration that provides boost and cut control in continuous manner. This circuit is very cheap to build, and it`s commonly implemented in....
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While doing some background reading about the Philips I2C bus I came across an application note written by Herman Schutte (of Philips Semiconductors Systems Laboratory in Eindhoven). Mr. Schutte described an elegant mechanism for interfacing sections of....
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The two-tone electronic doorbell circuit is composed of the input trigger circuit and audio output circuit, ans it is shown in Figure 3-107. The input trigger circuit is composed of the doorbell button S, transistor V1, resistors Rl-R3, capacitor Cl and dual....
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*We were inspired by the following project, and looked at the code for it, but ended up developing our own. However, if you are interested in making an umbrella that plays musical notes due to press, this is a great page: For more information about the 4051....
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This module is a "tribute" module, based on the awesome Steiner-Parker Synth VCF. Those who know me will know I`m not a big VCF fan. Nonetheless, this VCF really appeals to me. Its sound is quite unlike the Moog ladder, has a lot of character. Resonance is a....
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This AM/FM antenna booster circuit amplify the broadband signal from antenna. This antenna booster should work fro FM, AM, and SW receivers. Here is the....
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It shows the oscillator circuit optocoupler controlled by photoelectric coupling drive transistor...
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Circuit is shown. It consists of language and sound circuit FM transmitter circuit. The entire circuit is mounted on 25mm 35mm PCB, placing the table side, when there Jiezei bu..