Popular Circuits Page 36
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Atmel`s ATtiny1634 8-Bit AVR ® Microcontroller is based on the AVR ® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny1634 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to....
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The simple relay adder was built using free NOS relays sometime in 2005, but my goal was to someday build a more elaborate one that could run programs but notfill up a room like the early computers. Harry Porter built an incredible 415-relay computer which....
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This circuit was developed by Luigi Falcone, I1FLC. He uses seven plug in coils covering 3. 0 to 30Mhz in a Colpitts oscillator circuit. The coaxial socket J2 permits connection to a frequency meter when required. The coils are wound on Teflon formers with....
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The transmitter is equiped with LM567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to modulate IC1. Infrared transmitter frequency is adjusted with P2 between 25 and 40KHz...
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Timing IC using long RS6445C constitute blocking oscillator As shown in the timing for the introduction of integrated long RS6445C constitute a blocking oscillator. WI and W2 segmentation is used to adjust working time and closed for the time, both of which ..
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The tachometer, on the same shaft as the dc motor, is simply a generator. It gives a dc output voltage proportional to the speed of the motor. A summing amplifier, Al, controls its output so that the tachometer voltage equals the input voltage, but of....
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Nowadays, USB is the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, "use a....
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This is the electronic schematic of the homebuilt SONAR. Only one piezoelectric transducer is used for both transmit & receive. This transducer is switched from TX to RX via the four 4016 switches. A high gain amplifier stage & rectifier translates the....
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50w is a two-channel amplifier with a preamp and tone control o LA3160 its outer circumference elements constituting the input preamplifier oC1 the input coupling capacitor, th..
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The output voltage of a thermocouple is converted into frequency measured by a digital frequency meter. The output thermocouple signal is proportional to the temperature difference between the hot junction and the thermostat kept at 0°C, it drives the....
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I have a portable 50W light that is run off a 12V 7Ah battery. In some cases the light is too bright so i was wondering what parts i would need to mak....
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A simple Hi Fi amplifier circuit diagram with schematic for making audio amplifier,design using TDA 2616 IC, which is a stereo power amplifier, useful for radio,tape and television. Delivers 2*12 watts net 24 watts...
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DC voltage of the generator field winding by a three-phase thyristor rectifier provided later. In the same period incorrect, out of step, system failure, etc., the rectifier wi..
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As shown is a constant voltage/current power supply box diagram. It consists spread current, constant voltage and constant current of three parts. 3CF5 two power transistors in..
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The circuit presented here is that of a digital fan regulator, variable to provide five speed levels as catered for in ordinary fan regulators. The circuit of ceiling fan controller makes use of easily available components. An optional 7-segment display with....
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This is a simple circuit that can be used as a sequential signal light in automobiles. The circuit is based on two ICs. A TS 555 CN CMOS timer IC and a CD4017 decade counter IC. The IC1 is wired as an astable multivibrator to trigger the counter IC. When....
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I am driving a piezo disk at 100 Hz (or less) and am limited by the output of my signal generator to 10 V. I wish to amplify that to 50 or even 100 Volts. How to do ....
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Hens to provide adequate illumination can increase egg production rate, since when asked to shorten the winter sunshine, so chicken specialized households generally use artificial lights way for coop fill light...
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Expanding schematic circuit secondary circuit high-voltage lines ..
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An H bridge is a kind of circuit you use to control the direction (and sometimes speed) of an electric motor, using only a single polarity voltage (you need to reverse the way current flows in order to reverse the way the motor rolls). You have 4....
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This is a Turbo Bass circuit. Using this circuit, the low frequency sound signals(bass) can be multiplied. This circuit is an active circuit. The first op-amp....
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The biggest issue is that the RDS_on of the used MOSFETS is, driven with 5V gate voltage, too low. The other issue is that the the reverse voltage that occurs, when the MOSFET switches from on to off state kills the transistor. This revese voltage is caused....
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Our computer may often heated up due to long use or the hot climate, temperature controllers are necessary. You need to do a temperature measurement to ensure that the computer is work within the allowed range. To reduce pc temperature, here is circuit....
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The WS2512-TR1G, a Wide-band Code Division Multiple Access (WCDMA) Power Amplifier (PA), is a fully matched 10-pin surface mount module developed for WCDMA handset applications. This power Amplifier Module operates in the 1920-1980 MHz bandwidth. The WS2512-....
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The simple pressure sensor alarm is built around a couple of readily available cheap components. Working of this circuit is straight forward and self-explanatory. When the circuit is powered by a 9V compact battery, the active piezo-sounder at the output of....
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Differential amplifier circuit four connection methods and compare the characteristics of d d. O magnification equal to a single tube of half has a high common mode rejection c..
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GMSK_Demod is a model of a suboptimal (an optimal receiver would require the Viterbi algorithm) coherent GMSK demodulator (refer to the GMSK_Recovery component). Noncoherent demodulation can be performed with the FM_Demod component. Pin 1 is the input for....
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try another op amp. I could be changes in the input bias current that is causing a strange voltage drop across the 10k resistors. The LM358 is not really a high quality op amp it`s the diodes in the feedback loop. that`s a poor choice of limiter for a sine....
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We wrote about a phone bug in a previous post. Here`s an app note about a circuit for detecting and locating radio frequency transmitters. This design idea showcases a circuit that detects RF ""bugs,"" such as hidden wireless cameras, eavesdropping....
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hi Im trying to construct a Hartley Oscillator. I am using a bypassed common emiter and i am trying to get a 200kHz 2Vp-p oscilation. With a BC547B....
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The new TNT features both pre-amp and output gain selection switches, selectable 8watt and 2 watt output, "interlink" master volume control, bass and treble controls and "auto-aligning" output stage that automatically adjusts for 8 ohm or 16 ohm loads....
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The Dodge Aspen was a compact car produced from from 1976 to 1980 by Chrysler Corporation`s Dodge division. The 1976 Aspen model year, was available as a 2-door coupG©, 4-door sedan or 4-door station wagon, it came in three trim levels base, Custom and SE....
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Most surviving TR-1s no longer work. Many collectors (such as myself) prefer to keep them in "as-manufactured" condition. That way the authenticity is preserved. But at some point, you may be anxious to hear one play. Before you start soldering, ask one....
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The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The output of sensor converted to digital that easy connecting with microcontroller. Fig. 1 shows how....
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Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. The basic formula is P=VI and between input....
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The ISL5929 is a dual 14-bit, 130/210+MSPS (Mega Samples Per Second), CMOS, high speed, low power, D/A (digital to analog) converter, designed specifically for use in high performance communication systems such as base transceiver stations utilizing 2. 5G or....
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Compact thermal control solution for DWDM (Dense Wavelength Division Multiplexing) laser modules can be made using a MAX8520/21 and a single op amp....
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This interface is needed to connect the phone to a PC, because the PC`s serial port works with voltage levels between -12 and 12V (RS232 protocol) and the phone operates between 0 and 5V (TTL protocol). Don`t even think in conecting your phone directly to....
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The design of the circuit is aimed to create a preamplifier for television systems that would operate in the UHF frequency range of 450 MHz to 800 MHz and....
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This led lamp circuit can be used as a mini led flashlight. Together with a 1.2 V rechargeable battery, all the components fit into a small enclosure. This....
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Here is the schematic circuit board. Each switch puts out -2V when it`s on and 0V when it`s off. The four 4067 chips multiples the 64 switch signals into 4 signals that go back to the main PIC board...
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This mini audio amplifier will test the audio stages in amplifiers such as the front end of FM bugs. You can also use it on lots of our other projects as well as the output stages of radios. It is a very handy piece of test equipment and will make a perfect....
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This is of course the simplest electronic code lock circuit one can make. The circuit uses one transistor, a relay and few passive components. The simplicity does not have any influence on the performance and this circuit works really fine. The circuit is....
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thermocouple cold junction compensation and the MAX6675 converter circuit diagram of temperature measuring system composed of The circuit components are used:Temperature measurement system composed by the MAX6675 circuit diagram as shown. K-type thermocouple....
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This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate....
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The circuit of a FM Tracking Transmitter Circuit or Remote Control Transmitter Circuit is explained using 555 IC and and 2N4392 transistors....
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The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. A unique input stage allows ground referenced input signals. The output automatically self-centers to one-half the....
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The Wien-bridge oscillator, consists of an Operational Amplifier (OA) in a non-inverting configuration with gain 1 + R2/R1 and a RC feedback network....
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A 555 timer drives Ql through Q4 with a square wave. LED1 and LED2 light when an npn or pnp transistor respectively, are ..
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This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,....
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As shown for the voice-activated lamp circuit. The circuit consists of an operational amplifier FC52, flip-flop, the relay J, a piezoelectric crystal speaker y and other compon..
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A Very Simple circuit and some Variations. Play with it.
All parts are cheap and should be easily obtained. None are very critical. ..
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Circuit shown in Figure 3-49. The circuit autotransformer out of operation by the time relay KT control. KT delay time is equal to the motor start-up time. Circuit shown in Fig..
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Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i. e. at low frequency, period is measured for a complete wave....
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An audio frequency signal generator shown in FIG. Can output audio signal, 465kHz spectral amplitude signals, 52,5Hz4-16Q5kHz high frequency amplitude modulated signal. VT1 hig..
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The top channel is my signal to the gate of a mosfet. The mosfet is driving a tank circuit that contains a large coil wrapped on ferrite with a 5uF capacitor. Thecoil is large enough that the frequency is near 100Hz. The bottom channel shows the positive....
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The line is purposefully not straight, to see how it would do with zig-zags and splits, as are normal for the Chibots advanced line-following contest. The AVRcam is a small, real-time image processing engine capable of tracking colorful objects. The system....
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The circuit presented on this page attemps to be an interface to convert pulses such as provided by a Basic Stamp or R/C receiver to a dual PWM(Pulse Width Modulation) signal required by an H-bridge. The simplest circuit would use a small microcontroller....
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A potentiometer is a simple knob that provides a variable resistance, which you can read into the Arduino board as an analog value. In this example, you`ll connect a poterntiometer to one of the Arduino`s analog inputs to control the rate at which the....
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DC motor interfacing with microcontroller with the help of L293D H-bridge and trasistor based H-bridge. DC motor speed control using PWM. Interfacing DC motor with 8051, AVR, PIC microcontroller....
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This application note describes how to transmit I ²S audio data streams between two audio components across a single, shielded twisted-pair (STP) wire using the MAX9205 10-bit LVDS serializer and the MAX9206 10-bit LVDS deserializer. Low-voltage differential....
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Need USB solution for your project Use LPC2148 MCU. In old days it`s very handy using LPT or COM to interface your project to PC but today they are vanished just like dinosaur. All switch status can be monitored on the PC, as well as the ADC value. The LEDs....
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A sensitive electret microphone picks up the sound and feeds the signal to a two-stage amplifier circuit, consisting of Ula and Ulb. The amplified output of Ulb is fed ·to a voltage-doubler circuit (comprised of Dl, D2, C4, and C5). The output of the....
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The transmitter circuit uses Microchip`s dsPIC33FJ16GS504 for the analog-to-digital conversion of the input signals on two channels. The processed data on the dsPIC are then transmitted to the phone (for waveform display) via the LMX9838 bluetooth SPP....
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The circuit timer with musical alarm use famous CMOS oscillator/divider IC (IC1 ). Although this circuit operates in 9V its standby current drain is very low. The time delay of timer circuit can be adjusted by adjusting the preset VR1. The base of npn....
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This example shows how to design a circuit with a mixture of analog and digital parts, multiple power planes, and a single Ground plane split into analog and digital sections that have a common reference point....
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Figure 16-48 (a) for the introduction of six thyristor three-phase AC switching circuit; Figure 16-48 (b) as adopted by three triac circuits. Suitable for motors and other indu..
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I used a main part and 2N3055 Transister and IC TL072 for pulse oscillator generator. The output have voltage +50V and -50V at 2A to 3A. You must is used this....
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In many applications, a single on/off button switches the power supply on or off. Usually, the system switches off regardless of the processing function or workload the microcontroller or DSP circuit is currently handling. The small circuit in Figure 1 is....
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I recently created a ""Steady Hands Game"" - it started off as·eaching the need to have a game for a cub-scout event. However after prototyping the game (on the homework board), I created a more premanent version of this game that can be used for teaching.....
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This solar tracker circuit is an open source circuit and anyone may edit the circuit to his/her own preference. Watch the video for other useful information regarding features the solar tracker does and does not include that you may have to implement yourself...
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The notes for the fourth and final class are up on the Spooky Arduino class page. At the end of the class, Mark of Machine Project bestowed upon each of the students a merit badge. It was great. Click above for a larger view of the badge. Here`s a quick....
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A pair of cross-coupled SCRs can be used to build a first-response monitor circuit, as shown in the schematic diagram below. First-response circuit is....
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A tube commonly used as a tuning indicator in old radios. I had to try them out in my amps. So I plopped together a quick video to see the dramatic and cool visual effect. I will probably tweak some values but overall I am very happy with the visual effect.....
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Ql and Q2 constitute a simple, high-speed FET input buffer. Ql functions as a source follower, with the Q2 current source load setting the drain-source channel current. The LT1010 buffer provides output drive capability for cables or whatever load is....
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As shown in Figure 10 for the automatic conversion of wind speed control circuit. The circuit includes a clock signal generator IC1, counter IC2, decoder IC3, synchronous phase..
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This circuit is used in impulse speed modulation system. In this system, transmitter change impulse speed of modulated beam in optical fiber, let it change around 50kHz center frequency. L14G2 optical transistor convert molulated light to radio-frequency....
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CW is the simplest form of modulation. The output of the transmitter is switched on and off, typically to form the characters of the Morse code.
CW transmitters are simple and inexpensive, and the transmitted CW signal doesn`t occupy much frequency space....
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Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516. The TDA1516 is an integrated class B power amplifier in a 13 pin SIL package. The IC has many useful features such as short circuit protection, load dump protection, thermal....
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The TDA7021T integrated radio Receiver circuit is for portable radios, stereo as well as mono, where a minimum of periphery is important in terms of small dimensions and low cost. It is fully compatib....
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This overvoltage protection or crowbar protection circuit is used where we need protection against high voltage surge. The circuit has a few components, it....
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This is where the fun begin - the sound is hmm. "organic". Everything seems to smooth a bit compare to LME49720, a very subjective word. "musical" Also I hear more dynamics. Listening is best at extra high gain. Upon switching from LME49720, I actually hear....
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Free-running multivibrator keys power amplifier Q4 at audio role. Range is about 1 mile C6 tunes collector of oscillator to crystal frequency. -Texas lnstruments Inc. , "Transistor Circuit Design, " McGraw-Hill, N. Y. , 1963, p 361. ..
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This circuit will detect AC line currents of about 250 mA or more without making any electrical connections to the line. Current is detected by passing one of the AC lines through an inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800....
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High quality DAC convertor from USB to S/PDIF. I choose PCM2704 circuit, which sent me TI company like sample. Circuit has analog output for headphones and digital S/PDIF output with electrical and optical(TOSLINK) interface. We can use too 3 HID buttons for....
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During the development of systems that include small motors, a simple, bidirectional motor controller with speed adjustment may be helpful. Figure 1 shows such a controller. The circuit uses everyday components whose tolerances and ratings are unimportant as....
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General use camera backlighting base band circuit : the circuit of table of contents, Calyso, iota, matrix, keypad key, memory, IC image, Lcd connector, Lcd backlight driver, Locatest point, hole, Speaker4, camera connector, motor, Midi / MP3 ICS, charging....
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Motor is heating devices, by accident or overload often caused when the coil winding temperature is too high, as shown in FIG. 1-9 TC649 motor overheating protection and drive circuit. NTC thermistor RT close to the motor of the motor temperature detection,....
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With the aggravation and improvement of human environmental consciousness day by day of the energy crisis, the development and utilization of new energy is paid attention to more and more by people. And the solar energy has been favored by people recently as....
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The normal telephone bell, at times (specially during night when one does not want to be disturbed), appears to be quite irritating. The circuit shown here converts the loud sounding bell into a soft and pleasing musical tone....
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Each time switch S1 is closed the count on the CD4017 advances by 1 step and the coresponding LED turns on. When the maximium count plus 1 is reached for each circuit the cycle is restarted and repeats...