Popular Circuits Page 65
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The metal detector circuit is shown here that the limits represent the sake of simplicity for a metal detector, but the design works remarkably well. It only uses 40, 106 Hex Schmitt inverter IC, a capacitor and a search coil and of course batteries. An....
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How the circuit worksh1. Your title here The circuit comprises a non inverting amplifier with a final output buffer stage or voltage follower for impedance matchin....
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This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings....
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This circuit can be easily powered from a 1.5 volt battery. One characteristic of N type negative resistance devices is that they typically require a very low bias source resistance in order to keep the bias voltage stable within the negative resistance....
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This circuit uses a dual operational amplifier (TL082) to form a voltage-controlled oscillator (VCO). With the component values shown, the output-frequency range is 100 Hz to 10 kHz when the input control voltage is between 0. 05 and 10 V. ..
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Efficient inverter control circuit It shows a highly efficient inverter control circuit, which is used as the LCD backlight power supply circuit, which is mainly controlled by ..
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Black Beauty" is my nickname for this classy Bakelite set. Sporting a dramatic, assymetrical design, with deep wraparound louvers and a bullet-like profile, it`s a great example of 1940s Streamline design. Definitely a keeper, in other words! I`m restoring....
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With this circuit we can create a altered sound of siren. The oscillator IC1a-b is constituted by two gates NAND, oscillating in very low frequency. This oscillation drive the IC2, that is a electronic switch, which opens and closes in the rythm of....
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The following circuit shows about Slave Flash Light Control Circuit Diagram. Features: 68mH Inductor, give auto trigger for secondary flash light, ...
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Well, I try to follow an instructable for quiet a while now, but I still couldn`t understand its schematic.. its not that I don`t know what the symbo....
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This circuit will double low-level signals with low distortion. The value of C should be chosen for low reactance at the operating frequency. Signal level at the carrier input must be less than 25 mV peak to maintain operation in the linear region of the....
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Simple opamp circuit with one transistor gives reliable hot-wire anemometer for measuring flow of gases or liquids. R2 is heated above ambient temperature in Wheatstone bridge including overheat resistor R1which is calibrated to be 30% larger than cold....
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The original data sheet for the MK414 states a maximum working frequency is around 4 MHz. SW transmissions are so powerful that this receiver will work well with signals up to about 6 or 7 MHz. The 10k resistor controls the operating voltage for the IC which....
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The DIY `Plasma Gun` is a small homemade Tesla Coil gun powered by an 18V battery. It also has a special plasma discharge terminal that can fire ionized gas and flames! The whole system is mounted inside the body of an old cordless drill so that is fully....
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When you want the counter circuit since 0 arrive at 99. I thinks this circuit may on the same wave length you certainly. it uses IC LM4017 decade....
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A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will....
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The LCD in question appears to have more pins than the microcontroller, I could not expand the image to get a better look. Unless you are adamant about using this display, I recommend obtaining a hitachi compliant alphanumeric display (onboard driver), this....
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This article helps you to make a Light Sensitive Morning Alarm circuit. The morning light is sensed by an LDR (Light Dependent Resistor) or Photoresistor and it triggers the alarming section. The circuit generates a melodious tone when light falls on it.....
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When SW1, SW2 or SW3 are open the input sensitivity is suited to high-output devices like CD players, tuners, tape recorders, iPods, miniDisc players, computer audio outputs etc. Sometimes, the 750 Ohm value for R3, R13 and R17 resistors could be not easy to....
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After constructing the Pulse Width Modulator for High Power LEDs I needed to build another LED modulator for another optical transceiver. For this project I decided to take a different approach and use solely linear techniques for the audio modulation. Like....
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This circuit uses a conventional spring loaded mouse trap, available from hardware stores. However when a mouse is caught, the circuit triggers and transmits an interrupted tone on the commercial FM band to a nearby radio receiver. This circuit is a small....
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Unique applications of 567 tone/frequency decoder IC? Here is one of them: pulse generator with 25% duty cycle (active factor). This signal generator produce ...
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Convert a used CFL into a power saving LED lamp circuit that consumes only 50mA. This gadget can be used in applications like night light, table lamp etc....
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This circuit utilizes the MRF123 TMOS power FET. The MRF134 is a very high gain FET that is potentially unstable at both VHF and UHF frequencies. Note that a 68-0 input loading resistor has been utilized to enhance stability. ..
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This Circuit is based on the UM5100 which can record speech into a digital memory and then play it back. The device is designed to be used directly with static RAM's up to 256K bits, or with EPROM 's or ROM's for playback only. High quality voice....
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These items were sold nationally several years ago. The fish would sing, open its mouth, turn its head, and flap its tail. After removing the back panel, all of the existing electronics were removed leaving only the 3 servo motors, speaker and photocell. The....
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Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable multivibrator. The output from the collector of Q2 is connected to the input of the Darlington pair formed by Q3 and Q4.....
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I don`t know if this is a good design or not.Circle Op-amp are 2nd order low/high pass filter. Low pass filter range is 20-250Hz High pass filter....
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VCO (voltage controlled oscillator) is an electronic signal generator which produce a signal that has variable frequency depends on a voltage level at its....
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This device is used to photograph moving objects by triggering a camera or flashgun when one or two light beams are interrupted. It was designed to capture insects in flight, but can also be used for projectiles and anything else that moves too fast or....
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AP500 is a high-performance dual-channel FET DC amplifier driver module. It uses a high operating voltage. Push power, low distortion, wide frequency response, simple external ..
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We cover the hardware and the software and give a full design for a 12/24V DC 20A charge controller which can be used for solar, wind, hydro or pedal power applications. Please start here to get a full overview of the project. We have been wanting to design,....
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Stepper motors are a subject that keeps recurring. This little circuit changes a clock signal (from a square wave generator) into signals with a 90-degree phase difference, which are required to drive the stepper motor windings. The price we pay for the....
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The figures above shows the basic idea of any robot, where we have some inputs and output devices connected to the brain and some outputs controlled by the brain. In our case we will have the Arduino like the brain. The central Brain, controls all movements....
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A simple voltage status monitor built around the LM741 operational amplifier. These circuits are the best we have found in terms of accuracy, simplicity of operation, and cost. The LM741 is an operational amplifier. The wide range of uses of this simple and....
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Children lost a phenomenon often happens, look around, the family should not have brought enormous suffering and economic losses; in addition, also points to unscrupulous child..
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This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an increase in ac or dc supply voltage needs....
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No description available...
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Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music tran....
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Two LED CMOS Flasher Circuit Diagram This is a simple 2 led cmos robot ( flasher, multivibrator ) circuit using CD4069 six inverter....
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This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example, we commonly see use of infrared proximity sensors on public drinking fountains and in public washrooms. The....
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Timed precisely with the pistons` pumping, this component works with the ignition coil to create the voltage jump that causes the spark in the spark plug. Engine Cut Out Switch - Essentially an emergency button, when pressed, this provides a route to ground....
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This is high fidelity, high quality audio amplifier circuit diagram. You dont need pre amplifier. Component list: R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R....
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If a NiCad battery is discharged to a point at which the lowest capacity cell becomes fully discharged and reverses polarity, that cell will usually short internally and become unusable. To prevent this type of damage, this circuit detects a one-cell drop of....
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In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
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A typical circuit at 20 MHz is shown. The crystal, which has an internal series resistance RS, of 14 ©, oscillates at its third harmonic. The diode clamp D1 and D2 provides a constant amplitude control. The transistor operates continuously in a linear mode....
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To order boards, click to go to the ESP Purchase form. Verify the price and postage, then open the order form, fill it in and print it from your browser. Boards are sold only as a stereo pair, and are supplied with component overlay, circuit diagram, bill of....
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With the amount of equipment in home entertainment facilities today the need to be able to fluctuate the gain of the audio and also video signal is needed. I observed this specific circuit very helpful while used in conjunction with the General Descrambler....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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The hardware within this circuit involved a Picaxe 18M2 IC which is the programmable micro-controller in my design which can be programmed using a PC,....
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PowerMan UPS/Inverters Uninterruptible power supplies and voltage regulators Business founded in 1993. Prior to 2000. company engaged in distribution...
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Here is a simple frequency counter designed to monitor the 240VAC mains supply. It as a frequency range of 0-999Hz, so it could also be used with 400Hz equipment. Standard TTL/CMOS logic is employed for the counters and display drivers, while an ELM446 (IC1)....
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A Variable DC Power Supply is one of the most useful tools on the electronics hobbyist`s workbench. This circuit is not an absolute novelty, but it is simple, reliable, "rugged" and short-proof, featuring variable voltage up to 24V and variable current....
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Some ultrasonic range finders for my project. But most of the commercial sensors like Parallax`s PING sensor and other similar products are quite expensive, especially if multiple units are needed. So I thought why not building it myself The theory behind....
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Natural Radio" is simply radio noise with natural origins, mainly lightning, but also clouds of ions interacting with the earth`s magnetic field. Nearby lightning sounds like the familiar crackle heard on an ordinary AM radio but distant lightning produces....
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Generators that does not use fuel to function, these generators give 24hrs of electricity as long as you want to use them. Though in the earlier days of this invention a problem was encountered and this problem is that the battery that powers the generators....
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This chapter provides a variety of circuits of both line powered and inverter types for the basic power supply, some with regulators, modulation inputs, and other goodies. Several have been reverse engineered from actual working commercial products. Some of....
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This circuit shows amplifier Al as a sensor amplifier in a bridge configuration. Amplifiers A2 and A3 are configured as a voltage to frequency converter and A4 is used as the transmitter. This entire sensor/ transmitter can be powered directly from a 4 to....
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This receiver consists of an input network amplifier IC7 FSK PLL detector ICG, and output am..
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This matrix can show the values of two variables, for example, frequency and voltage. The display is a graph made from a matrix of LEDs. The LEDs on each axis are color coded, red for out of tolerance and green for in, fanning a red band around the inner....
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The circuit is designed as a constant voltage source with a negative temperature coefficient. The transistor Q1 (BD 140) is used as the temperature sensor. The transistor Q2 is used to prevent the battery from discharging through R1 when the mains power is....
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A constant-voltage active load can perform as a battery during the charge cycle. You can set the load voltage from 5 to 35V by using potentiometer PV and thus can simulate batteries ranging from 6 to 32V. In testing a battery charger (during design or for....
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This circuit provides a visual 9 second delay using 10 LEDs before closing a 12 volt relay. When the displace about-face is closed, the 4017 decade adverse will be displace to the 0 calculation which illuminates the LED apprenticed from pin 3. The 555 timer....
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This timer circuit is similar to the 5 to 30 minute timer except that when switch S1 is closed, the on/off action of the circuit will continue indefinitely until S1 is opened again. A 7555 time and low leakage type capacitor for C1 must be used. The 6 way....
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Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring....
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The battery charger circuit which is able to charge 6V 4. 5 AH lead acid batteries. The schematic is very simple and using only few components. IC LM317T is the heart of the circuit. The circuit is automatic so when the battery will become full charge it....
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Good Preparation. I like this. There is one suggestion you can use RFM70 or RFM22 for RF communication....
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TDA5200 is a low-power single-chip ASK superheterodyne receiver circuit. Its operating frequency range has two block. They are 868 ~ 870MHz and 433 ~ 435MHz. The circuit is highly integrated. It has few external components, perfect function. It is a single....
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Electronic decorative peacock composed of 10 light-emitting diodes, each light emitting diode includes a plurality of light-emitting diodes, light-emitting diodes mounted in th..
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The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to....
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An RF probe is used to directly measure the level of RF voltage present at a particular point and is one of the most useful test instrument in the hands of the home brewer. It is normally used with a digital multi meter to indicate the voltage level as dc....
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Here`s a small FM transmitter ciruit for your desktop or laptop to enjoy the movie and music from a distance. This FM transmitter, which is powered by USB, recovers output on your computer or your MP3 player to the relay on the tape FM (frequency 108 MHz).....
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183. 6MHz SAW filter in a CDMA application. The SAW filter S-parameter is used to simulate the interface with the mixer. A worked example is provided with a SAWTEK 855893 SAW filter. An optimum impedance matching circuit between the MAX2338 mixer....
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I usually can`t hear the doorbell when I`m in the basement. This project describes how to add an inexpensive remote doorbell to your existing household doorbell. My doorbell runs off of a 24VAC transformer that is live all the time. Someone presses the....
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The circuit is built around the LM567 tone decoder IC that requires about 100 millivolts at its operating frequency. The frequency is set by a 10 K variable resistor and can be between 700 and 1500 He..
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Simple and easy build of FM transmitter circuit. The circuit only require 2 transistors. Circuit Notes: Typically the default for the capacitors model is ceramic, preferably the npo 1% type or equivalent. However, generally almost nothing critical right....
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The Meter and other small circuit differences, gives better performance.
On the Schematic, I show Two Possible Coils.
1) The Ferrite Rod, creates an Accurate Pin Point.
But it also has a Very Narrow Detection Field.
2) The Dual Wound "Tesla Coil"....
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The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the....
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Solder aid is an extremely useful device which sucks the poisonous gas due to melted soldering alloy and sucks it away using an ordinary 12VDC fan removed from a computer. The circuit is shown in Fig 1. It is basically a 1.25-14.5VDC regulated voltage source....
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RS-232 system connection faster and easier, But distance is not far. so to change to use the system RS-485 with this RS-232 to RS-485 converter projects. It....
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This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator. If you need to monitor some audio signal at a....
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The AD322 is an 8 amp G-Scale DCC decoder. The notes below may be of benefit to owners who wish to understand or repurpose ("hack") the decoder. It has a rather full set of functions that could easily be repurposed for a number of other projects. One....