Popular Circuits Page 158
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This circuit controls resistive and inductive loads up to 2, 500W. Its main functional device is an integrated phase control circuit - Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An....
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It is sometimes necessary for an RC (remote control) model to contain some kind of switching functionality. Some things that come to mind are lights on a model boat, or the folding away of the undercarriage of an aeroplane, etc. A standard solution employs a....
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This is the schematic of the final design including the tone stack but leaving out the volume, balance, and sonic controls. The right half of the circuit is John Broskie's original White cathode amplifier with a pair of 5687s as output tubes. This lowers the....
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This was my first published article, and fell out of my work on the homebrew 8008 system that is now in the Computer History Museum (that link includes four detailed photos). It`s basically a one-way simple UAR/T, though those devices were pricey back then....
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One method of controlling power to ac circuits uses a triac to turn the power on and off at precisely timed intervals that are synchronized with the ac signal. This method is called AC phase control. It is the method used in many light dimmer and heater....
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This is a high quality RF signal meter based around the Analog Devices AD8313 0. 1 GHz - 2. 5 GHz logarithmic detector IC. It is capable of detecting signals as low as -80 dBm. When combined with 2. 4 GHz or 915 MHz bandpass filters, it makes a quick visual....
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A very simple TV audio video transmitter circuit can be designed using this schematic diagram. This TV audio video transmitter circuit can be used to transmit video signals from VCR ( or some other device ) to a TV without using any cable. Video signals....
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Working on live telephone circuits can be a problem. You just can't connect a normal scope probe to the circuit while it is tied to the phone line. Neather side of a phone line is ground. When a phone or other device is 'offhook', one side floats at about....
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Adding a pair of one shots to the output of a 567 tone decoder renders it less sensitive to out-of-band signals and noise. Without the one shots, the 56Tis prone to spurious output chatter. Other protection schemes, such as feeding back outputs or using an....
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Is it possible to use DRAM with microcontroller AVR? Yes, it is possible. Jesperh has proved it. He hooked up a DRAM to a small processor (in this case an Microcontroller Atmel 8515), and handle the RAS/CAS sequencing and refresh in software. The type of....
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The microcontroller used is 0822 zilog encore! 8k series (soic,28pin) as shown on the figure. Is a programmable microcontroller, the functions used are the GPIO and the UART of the chip. GPIO is used on led indicators, and the UART is used for giving and....
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Ai. A2 series with the telephone line, when the sound wrong or off-hook current is passed lC, inside the arc tube made of light so wins the photosensitive MOSFET, VT J withdraw..
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Commonly used high sensitivity header is actually using microampere meter, use it to produce resistance meter using voltage can be very low, but producers still with the law an..
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By the PI.] P-type transistor VT2, VT3 and other components common emitter-coupled trigger (ie, Schmitt trigger device), equivalent to a switching circuit to detect a change in..
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This simple ""heat sensing circuit"" acts as a warning device whenever the temperature exceeds the preset level in its vicinity. It is an ideal circuit to monitor the heat generating devices like PC, Inverter etc ..
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There are 2 ways to build a protximity detector. One is mount the IR LED and the phototransistor so that they face each other. Then the infrared light is detected by the phototransistor. If an object comes between the IR LED and the phototransistor, the....
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This high-voltage pulse supply will generate pulses up to 30 kV. Ql and Q2 form a multivibrator in conjunction wi..
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This circuit, shown symmetrically, divides an input by virtually any odd number. The circuit counts n + 1/2 clocks twice to achieve the desired divisor. By selecting the proper n, which is tbe decoded output of the LS161 counter, you can obtain divisors....
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This schematic is version of a simple LED chaser. There is no 555 timer used because at my local electronics store they are over $4 Cdn. Instead, an oscillator made up of two sections of a 4011 NAND gate is employed. This chip is very inexpensive and....
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A circuit to extract and measure the modulated carrier of an Infra Red remote control. Note that the circuit does not physically separate control pulses from modulation, but amplifies the completereceived signal allowing the waveform to be displayed ideally....
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LMD18245 bipolar stepper motor driver circuit design using few electronic parts..
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The HF/SW receiver preamplifier is comprised of a broadband toroidal transformer (LI-a and Ll-b), LC network (comprised of a 1600-kHz, high- pass filter-and a 32-MHz, low-pass filter), L2 and L3 (26 turns of #26 enameled wire wound on an Amidon Associates....
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It consists of single-junction transistor VTi, resistance Ri, potentiometer RP, capacitor C consisting of relaxation oscillator and amplifier transistor VTz...
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Variable-gain amplifiers (VGAs) can be used in may types of systems, such as radio receivers. In this system, the input signal voltage depends on an...
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Current three-phase motor phase protection circuit, as shown in FIG. 3 homemade small current transformers Tl, T2 and T3 on the motor is running three-phase current detection s..
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This circuit is a circuit that sounds a siren-like sound of ambulance sirens. This circuit is different to an ambulance siren circuit generally, is to use transistors instead of IC 555. Which allows economical and easy to tailor a network. Operation of the....
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Simple counting can be done by anyone but counting in interval up to large number is tedious and the chance of forget is maximum. As, we have already published Counter Circuit | Digital Counter. Now, here electronics counter is second project by dreamlover....
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Schematic of Big Trak`s motor driver circuit. The toy includes 9112 and 9113 transistors (and sometimes 2N6715) because the 75494 chip can`t supply enough current to run the Big Trak`s motors by itself....
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The idea behind this snore alarm, is just to rouse the snorer, not the entire household. To wake the sleeper, vibration is used, not an audible alert. The vibration is provided by a small motor housed in a small 35mm film case, which can be placed under the....
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As we know many kinds of insects have their tendency to hear ultrasonic sound(which cause them irritation), this project is very useful to swept away those insects like mosquito cockroach etc. ..
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Interface Information for Computer to Radio using PCALE and other ALE software controllers. HFLINK is the international resource for ALE Automatic Link Establishment High Frequency Communications, HF Digital Messaging, Emergency / Disaster Relief,....
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After installing in the car (Not running but with it in reverse and with emergency brake on) it also worked good! The when I started the car and backed out of the garage the beeping frequency became very eratic as I tapped the brake or turned the steerin..
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This circuit has an advantage in that almost all of the energy in the collapsing magnetic field of L2 is transferred to C2. Where as in a normal Joule thief some of this energy is returned to the battery. This is a result of the resistor VR2 preventing rapid....
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Currently, high-quality communications receiver in the use of diode ring mixers and mixer by a double differential pair balanced modulator constituted, set into an analog multiplier (MC1496)..
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Crystal 80mW FM transmitter circuit diagram of the production ..
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It is possible to implement a PoE Plus-required power level of 30 W, with the aid of an external MOSFET and a controller designed for the older standard....
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This is a schematic diagram of video amplifier circuit with bi-phase output. Bi-phase output provides both positive-going and negative-going signal, and can be used as balanced signaling. The main component of this circuit is LM1201 In this circuit, the....
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For circuits using TTL ICs the supply voltage is a great concern and a slight increase in supply from the rated 5V may damage the IC. Using fuses alone does not solve the problem because a fuse may take several milliseconds to blow off and that`s enough time....
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The following circuit shows about BC 547 Transistor For Garage Alarm Sensor Circuit Diagram. Features: simple single-zone burglar alarm circuit, ....
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The threaded drive rod was made from standard 5/16 inch Whitworth threaded rod (18 TPI), only because this was to hand. M8 metric thread could have been used. The radius of the curve in the drive rod (which must be equal to the distance between the hinge and....
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This circuit gives a regulated output of between 5 V and 15 Vdc, adjusted and set by a preset resistor. Current output up to about 350 mA..
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This circuit uses a VFO operating from 15 to 18 MHz (Ul), which feeds a balanced mixer (U2). A fixed oscillator signal is mixed with this signal to generate an output from 0.4 to 33 MHz. FL1 and FL2 are low- and high-pass filters that are used to eliminate....
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This Led table or reading lamp circuit can be used for many purposes for example as a reading lamp for bed, desktop or table lamp, keyboard lamp (to view keys of your computer keyboard in dim light), as an LED emergency light in the absence of AC supply, as....
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This product is amazing. My computer was having issues with the registry. After installing, scanning, and fixing the errors my computer now runs like it is brand new. I would recommend this to others...
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Monitoring current on inductive loads is a common task. It`s easier to do on the low side of a driving circuit, because a simple resistor can be used with an op-amp on the ground rail. The high side often demands that an expensive current sensing transformer....
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It is based on NE555 as simple noise-maker whose output is fed to a single transistor oscillator. The oscillator is designed to operate between 800MHz and 2GHz which happens to be the frequency span used for GSM phones. The frequency of operation is set with....
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This design allows to operate two intercom stations leaving the operator free of using his/her hands in some other occupation, thus avoiding the usual "push-to-talk" operation mode. No complex changeover switching is required: the two units are connected....
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Here is a simple circuit for a one transistor Audion type radio powered by a 1. 5 V battery. It employs a set of standard low-impedance headphones with the headphone socket wired so that the two sides are connected in series thus giving an impedance of 64 ©.....
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The 555 IC is wiredin monostable mode of operation. Please read the article Monostable Multivibrator using 555 Timer for more details. In this mode the output is LOW (0V) when there is no triggering, when it istriggeredvia 2nd pin the output goes HIGH (Vcc)....
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This project is an older design and has most likely been superceded by a newer one. However, it is still a viable design and useful for your home-brew synth. Sorry but most of these do not have circuit descriptions, parts lists or PC board layouts (They....
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High-speed current sensing presents a designer with some significant challenges. Most techniques for sensing current involve measuring the differential voltage the current produces as it flows through a sense element, such as a resistor or a Hall-effect....
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By using only two 2n2222 transistors, this small FM band transmitter can transmit its signal to 1Km away (without obstacles between the two antennas. ..
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The Vc1 increases linearly when the pull-up resistor RA in the mono stable circuit is replaced with constant current source, generating a linear ramp. This is the figure that shown the linear ramp generating circuit and the generated linear ramp waveforms....
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As mentioned before, a reason to modulate a message signal is to match the communication`s channel frequency. The reason for this is that information to be send over the channel is often at a rather low frequency. For example, the sound of music range in....
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Buffer amplifier is required by a typical pH probe to isolate its 10^6 to 10^9 ohm source resistance from external circuitry. Such an amplifier is shown in the....
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This circuit is designed to provide an inexpensive way to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multi meter. The circuit is specifically designed for testing phototransistors. This the figure for the circuit;....
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the circuit diagram is shown below. hopefully it is readable.if you`ve got a breadboard, lay one out first and make sure it all works!AGH sorry! Revis....
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This inverter circuit can be used to power electric razors, stroboscopes and flash tubes, and small fluorescent lamps from a 12 volt car battery. In contrast to the usual feedback oscillator type of inverter, the oscillator of this inverter is separate from....
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This circuit is intended to program AVR controllers such as the AT90S1200 via the parallel port. The circuit is extremely simple. IC1 provides buffering for the signals that travel from the parallel port to the microcontroller and vice versa. This is....
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6V to 12V DC converter circuits that can be used to convert a small voltage of about 6 volts to a higher voltage of 12 volts but ofcourse with a lower current rating. This inverter circuit can provide up to 800mA of 12V power from a 6V supply. For example,....
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A reliable 6 to 12 volts Voltage converter circuit and diagram using audio amplifier IC TDA 2003. This Voltage doubler circuit can be assembled on a Vero board....
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Basic Regen design is pretty common, so BEFORE the schematic comes the "concept stage", the "what`s available in the junkbox stage", back to the "concept stage", followed by the "mechanical/electrical layout stage", then sketch a rough schematic. and do it....
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This type of reset pulse is ideally provided by this circuit. Because of the high input impedance of the Schmitt trigger, long reset pulse times may be achieved without the excess dissipation that results when both output devices are on simultaneously, as....
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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....
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The watchdog timer contains a counter, IC3, in addition to the usual retriggerable 555 timer, ICl. The counter will so..
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This phase-shift oscillator is useful for audio oscillator applications. Adjust R7 for a good sine w..
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This is a Logic probe circuit is one, That is suitable for checking the voltage levels in the TTL circuit. It receives from the circuit being tested. Shows how high or low logic level one. The circuit when the input voltage to the probe Tip is higher than 2.....
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At the time I saw this there were a couple of units on the market. Non of which interested me because it locked you into a specific phone, or required the phone to be permanently mounted on the bike. The Kennedy (at about $79. 00) was supposed to be....
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This electronic clock is composed of the LM8365 and the LDD640R displayers. The LM8365 can display the hour/minute and month/day.etc; you can set two alarm ouptuts AD1 and AD2 by pressing 12h or 24h; VDD=-21 to -6.5V, it directly drives the LED displaying;....
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For normal wailing tone, short D1 and open R2. For fast rise and slow fall in frequency, include D1 and R2. Use of a CD4046B with a diode-RC network as shown produces a siren tone, using a VCO. ..
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When the pushbuttons at either door are depressed, this circuit generates a different tone for each door. Tones are ge..
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The medical ultrasonic atomizer circuit is composed of power supply circuit, on the low side of liquid level protection control circuit, ultrasonic oscillator and fan drive circuit, it is shown in the figure 9-112. The power supply circuit is made of power....
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The page is about equipping an Atmel AVR microcontroller based system with a Prism WLAN interface. This document is intended for people that already have experiences with the AVR microcontrollers and teaches them how to add a cheap but flexible WLAN....
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A very simple LED flasher circuit. With HT-2014L the circuit produces 1 flash per second and the HT-2014M produces 2 flashes per second...
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This project is inspired by the DPRG IRPROX project. They have a pretty good PCB layout and idea. I would like to thank them for posting their project for all of us to see and learn from, I wouldn`t have started PIC programming without them, or at least not....
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This converter uses a low-pass filter instead of the usual tuned circuit so the only tuning required is with the receiver. The dual-gate MOSFET and FET used in the mixer and oscillator aren"t critical. Any crystal having a frequency compatible with the....
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This is an interface circuit for digital data input. This circuit consist of touch button, op-amp, diode, capacitor and resistors. Any conductor surface can be...
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Lithium Ion charger circuit design electronic project using LM3632 controller...
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I have been hacking the Dyna PAS chassis with various cascoded and cascaded phono circuits all employing negative feedback RIAA EQ in search for a circuit that will satisfy my musical requirements. My research ended when I discovered thisunglamorous2-stage....
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This novel circuit uses a flashing LED as the clock input for a 4017 decade counter. Typical flashing LEDs (eg, DSE cat Z-4044) flash at about 2Hz so the outputs Q0-Q9 will cycle through at that rate. For example, Q0 will turn on for half a second, then Q1,....
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Circuit To relieve you of any concern related to high frequency, I used a module ready, in case a module Aurel audio FM transmitter. This tiny circuit board with 2 cm by 4 cm supports a transmitter modulation frequency track, delivering an RF power of 10 mW....
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With reference to the schematic, lamp, LP2, is a power-on indicator. The other lamp (lower) lights when the unit reaches its preset current limit. R5, C2, and Q10 (TO-3 case) operate as a capacitor multiplier. The 36 volt zener across C2 limits the maximum....
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classic 555 timer chip schematic circuit t shirt by eevblog picture on VisualizeUs - Bookmark pictures and videos that inspire you. Social bookmarking of pictures and videos. Find your pictures and videos....
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Capacitor C3 according to cut off the power (ie, VT cutoff) of the delay time to choose. Figure, SB is the reset button after the failure to eliminate. ..
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U1a is an oscillator and U1b tbe measurement part of tbe circuit. It converts unknown capacity into a pulse-width modulated signal the same way an·automotive dwell meter works. The meteris linear so tbe fraction or percentage of time that tbe output is....
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A MFM Encoder works according to the principle of time shifting and phase shifting. This method is based on the transmitting frequency and the MFM signals are generated in connection with the double transmitting frequency. More details concerning the MFM can....
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This Remote control Jammer device it’s useful when we need to block someone to use the remote control (children that change frequently the channels at tv). This remote control jammer it’s very simply and it use two infrared Leds which continuously transmit....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. This mixer shows you how to accomplish microphone pre-amps for low and hi impedance mics. Use the everyman babble op-amp you....
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TDA integrated circuits series are very well apreciated and used in amplifier designs and projects. TDA audio amplifier circuits are produced in generally by Philips and SGS-THOMSON. The most used ICs are TDA2030 and TDA2003 for small audio amplifiers kits....
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This article provides an overview of the R100 and MCR100 UHF repeaters. All of the information came from physical examination of the station and running the programming software, as well as the R100 Instruction (and service) Manual, p/n 6881078E15 and the....
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This voltage regulator circuit gives a stable 5V output from unregulated inputs (more than 5V). The stability of the output voltage is good enough, only change...
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When speaking of fan control, there are generally 2 ways of doing it, linear control, and pulse-width control. The linear control is the most common. The idea is to decrease the voltage to the fan. If the fan is specified to 12 volts, in most cases you can....
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This is a Voltage Controlled Oscillator? (VCO) circuit. This circuit is based on Hartley oscillator. The frequency depend on the value of C1 and L1. The...
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